Theory of everything
Hypothetical physical concept
A theory of everything ( TOE ), final theory , ultimate theory , unified field theory or master theory is a hypothetical, singular, allencompassing, coherent theoretical framework of physics that fully explains and links together all aspects of the universe . ^{ [1] } ^{ : 6 } Finding a theory of everything is one of the major unsolved problems in physics . ^{ [2] } String theory and Mtheory have been proposed as theories of everything. ^{ [3] }
Over the past few centuries, two theoretical frameworks have been developed that, together, most closely resemble a theory of everything. These two theories upon which all modern physics rests are general relativity and quantum mechanics . General relativity is a theoretical framework that only focuses on gravity for understanding the universe in regions of both large scale and high mass: planets , stars , galaxies , clusters of galaxies etc. On the other hand, quantum mechanics is a theoretical framework that only focuses on the three nongravitational forces for understanding the universe in regions of both very small scale and low mass: subatomic particles , atoms , molecules , etc. Quantum mechanics successfully implemented the Standard Model that describes the three nongravitational forces: strong nuclear , weak nuclear , and electromagnetic force – as well as all observed elementary particles. ^{ [4] } ^{ : 122 }
General relativity and quantum mechanics have been repeatedly validated in their separate fields of relevance. Since the usual domains of applicability of general relativity and quantum mechanics are so different, most situations require that only one of the two theories be used. ^{ [5] } ^{ [6] } ^{ [7] } ^{ : 842–844 } The two theories are considered incompatible in regions of extremely small scale – the Planck scale – such as those that exist within a black hole or during the beginning stages of the universe (i.e., the moment immediately following the Big Bang ). To resolve the incompatibility, a theoretical framework revealing a deeper underlying reality, unifying gravity with the other three interactions, must be discovered to harmoniously integrate the realms of general relativity and quantum mechanics into a seamless whole: a theory of everything may be defined as a comprehensive theory that, in principle, would be capable of describing all physical phenomena in this universe.
In pursuit of this goal, quantum gravity has become one area of active research. ^{ [8] } ^{ [9] } One example is string theory, which evolved into a candidate for the theory of everything, but not without drawbacks (most notably, its apparent lack of currently testable predictions ) and controversy. String theory posits that at the beginning of the universe (up to 10 ^{ −43 } seconds after the Big Bang), the four fundamental forces were once a single fundamental force. According to string theory, every particle in the universe, at its most ultramicroscopic level ( Planck length ), consists of varying combinations of vibrating strings (or strands) with preferred patterns of vibration. String theory further claims that it is through these specific oscillatory patterns of strings that a particle of unique mass and force charge is created (that is to say, the electron is a type of string that vibrates one way, while the up quark is a type of string vibrating another way, and so forth).
String theory/Mtheory proposes six or seven dimensions of hyperspace in addition to the four common dimensions for a ten or elevendimensional spacetime .
Name
Initially, the term theory of everything was used with an ironic reference to various overgeneralized theories. For example, a grandfather of Ijon Tichy – a character from a cycle of Stanisław Lem 's science fiction stories of the 1960s – was known to work on the " General Theory of Everything ". Physicist Harald Fritzsch used the term in his 1977 lectures in Varenna . ^{ [10] } Physicist John Ellis claims ^{ [11] } to have introduced the acronym "TOE" into the technical literature in an article in Nature in 1986. ^{ [12] } Over time, the term stuck in popularizations of theoretical physics research.
Historical antecedents
Antiquity to 19th century
Many ancient cultures such as Babylonian astronomers , Indian astronomy studied the pattern of the Seven Sacred Luminaires / Classical Planets against the background of stars , with their interest being to relate celestial movement to human events ( astrology ), and the goal being to predict events by recording events against a time measure and then look for recurrent patterns. The debate between the universe having either a beginning or eternal cycles can be traced back to ancient Babylonia . ^{ [13] } Hindu cosmology posits that time is infinite with a cyclic universe , where the current universe was preceded and will be followed by an infinite number of universes. ^{ [14] } ^{ [15] } Time scales mentioned in Hindu cosmology correspond to those of modern scientific cosmology. Its cycles run from our ordinary day and night to a day and night of Brahma, 8.64 billion years long. ^{ [16] }
The natural philosophy of atomism appeared in several ancient traditions. In ancient Greek philosophy , the preSocratic philosophers speculated that the apparent diversity of observed phenomena was due to a single type of interaction, namely the motions and collisions of atoms. The concept of 'atom' proposed by Democritus was an early philosophical attempt to unify phenomena observed in nature. The concept of 'atom' also appeared in the Nyaya  Vaisheshika school of ancient Indian philosophy .
Archimedes was possibly the first philosopher to have described nature with axioms (or principles) and then deduce new results from them. Any "theory of everything" is similarly expected to be based on axioms and to deduce all observable phenomena from them. ^{ [17] } ^{ : 340 }
Following earlier atomistic thought, the mechanical philosophy of the 17th century posited that all forces could be ultimately reduced to contact forces between the atoms, then imagined as tiny solid particles. ^{ [18] } ^{ : 184 } ^{ [19] }
In the late 17th century, Isaac Newton 's description of the longdistance force of gravity implied that not all forces in nature result from things coming into contact. Newton's work in his Mathematical Principles of Natural Philosophy dealt with this in a further example of unification , in this case unifying Galileo 's work on terrestrial gravity, Kepler 's laws of planetary motion and the phenomenon of tides by explaining these apparent actions at a distance under one single law: the law of universal gravitation . ^{ [20] }
In 1814, building on these results, Laplace famously suggested that a sufficiently powerful intellect could, if it knew the position and velocity of every particle at a given time, along with the laws of nature, calculate the position of any particle at any other time: ^{ [21] } ^{ : ch 7 }
An intellect which at a certain moment would know all forces that set nature in motion, and all positions of all items of which nature is composed, if this intellect were also vast enough to submit these data to analysis, it would embrace in a single formula the movements of the greatest bodies of the universe and those of the tiniest atom; for such an intellect nothing would be uncertain and the future just like the past would be present before its eyes.
— Essai philosophique sur les probabilités , Introduction. 1814
Laplace thus envisaged a combination of gravitation and mechanics as a theory of everything. Modern quantum mechanics implies that uncertainty is inescapable , and thus that Laplace's vision has to be amended: a theory of everything must include gravitation and quantum mechanics. Even ignoring quantum mechanics, chaos theory is sufficient to guarantee that the future of any sufficiently complex mechanical or astronomical system is unpredictable.
In 1820, Hans Christian Ørsted discovered a connection between electricity and magnetism, triggering decades of work that culminated in 1865, in James Clerk Maxwell 's theory of electromagnetism . During the 19th and early 20th centuries, it gradually became apparent that many common examples of forces – contact forces, elasticity , viscosity , friction , and pressure – result from electrical interactions between the smallest particles of matter.
In his experiments of 1849–50, Michael Faraday was the first to search for a unification of gravity with electricity and magnetism. ^{ [22] } However, he found no connection.
In 1900, David Hilbert published a famous list of mathematical problems. In Hilbert's sixth problem , he challenged researchers to find an axiomatic basis to all of physics. In this problem he thus asked for what today would be called a theory of everything. ^{ [23] }
Early 20th century
In the late 1920s, the new quantum mechanics showed that the chemical bonds between atoms were examples of (quantum) electrical forces, justifying Dirac 's boast that "the underlying physical laws necessary for the mathematical theory of a large part of physics and the whole of chemistry are thus completely known". ^{ [24] }
After 1915, when Albert Einstein published the theory of gravity ( general relativity ), the search for a unified field theory combining gravity with electromagnetism began with a renewed interest. In Einstein's day, the strong and the weak forces had not yet been discovered, yet he found the potential existence of two other distinct forces, gravity and electromagnetism, far more alluring. This launched his 40year voyage in search of the socalled "unified field theory" that he hoped would show that these two forces are really manifestations of one grand, underlying principle. During the last few decades of his life, this ambition alienated Einstein from the rest of mainstream of physics, as the mainstream was instead far more excited about the emerging framework of quantum mechanics. Einstein wrote to a friend in the early 1940s, "I have become a lonely old chap who is mainly known because he doesn't wear socks and who is exhibited as a curiosity on special occasions." Prominent contributors were Gunnar Nordström , Hermann Weyl , Arthur Eddington , David Hilbert , ^{ [25] } Theodor Kaluza , Oskar Klein (see Kaluza–Klein theory ), and most notably, Albert Einstein and his collaborators. Einstein searched in earnest for, but ultimately failed to find, a unifying theory ^{ [26] } ^{ : ch 17 } (see Einstein–Maxwell–Dirac equations).
Late 20th century and the nuclear interactions
In the 20th century, the search for a unifying theory was interrupted by the discovery of the strong and weak nuclear forces, which differ both from gravity and from electromagnetism. A further hurdle was the acceptance that in a theory of everything, quantum mechanics had to be incorporated from the outset, rather than emerging as a consequence of a deterministic unified theory, as Einstein had hoped.
Gravity and electromagnetism are able to coexist as entries in a list of classical forces, but for many years it seemed that gravity could not be incorporated into the quantum framework, let alone unified with the other fundamental forces. For this reason, work on unification, for much of the 20th century, focused on understanding the three forces described by quantum mechanics: electromagnetism and the weak and strong forces. The first two were combined in 1967–68 by Sheldon Glashow , Steven Weinberg , and Abdus Salam into the electroweak force. ^{ [27] } Electroweak unification is a broken symmetry : the electromagnetic and weak forces appear distinct at low energies because the particles carrying the weak force, the W and Z bosons , have nonzero masses ( 80.4 GeV/ c ^{ 2 } and 91.2 GeV/ c ^{ 2 } , respectively), whereas the photon , which carries the electromagnetic force, is massless. At higher energies W bosons and Z bosons can be created easily and the unified nature of the force becomes apparent.
While the strong and electroweak forces coexist under the Standard Model of particle physics, they remain distinct. Thus, the pursuit of a theory of everything remained unsuccessful: neither a unification of the strong and electroweak forces – which Laplace would have called 'contact forces' – nor a unification of these forces with gravitation had been achieved.
Modern physics
Conventional sequence of theories
A theory of everything would unify all the fundamental interactions of nature: gravitation , the strong interaction , the weak interaction , and electromagnetism . Because the weak interaction can transform elementary particles from one kind into another, the theory of everything should also predict all the various different kinds of particles possible. The usual assumed path of theories is given in the following graph, where each unification step leads one level up on the graph.
Theory of everything  
Quantum gravity  
Space Curvature  Electronuclear force ( Grand Unified Theory )  
Standard model of cosmology  Standard model of particle physics  
Strong interaction
SU(3) 
Electroweak interaction
SU(2) x U(1) _{ Y } 

Weak interaction
SU(2) 
Electromagnetism
U(1) _{ EM } 

Electricity  Magnetism  
In this graph, electroweak unification occurs at around 100 GeV, grand unification is predicted to occur at 10 ^{ 16 } GeV, and unification of the GUT force with gravity is expected at the Planck energy , roughly 10 ^{ 19 } GeV.
Several Grand Unified Theories (GUTs) have been proposed to unify electromagnetism and the weak and strong forces. Grand unification would imply the existence of an electronuclear force; it is expected to set in at energies of the order of 10 ^{ 16 } GeV, far greater than could be reached by any currently feasible particle accelerator . Although the simplest grand unified theories have been experimentally ruled out, the idea of a grand unified theory, especially when linked with supersymmetry , remains a favorite candidate in the theoretical physics community. Supersymmetric grand unified theories seem plausible not only for their theoretical "beauty", but because they naturally produce large quantities of dark matter, and because the inflationary force may be related to grand unified theory physics (although it does not seem to form an inevitable part of the theory). Yet grand unified theories are clearly not the final answer; both the current standard model and all proposed GUTs are quantum field theories which require the problematic technique of renormalization to yield sensible answers. This is usually regarded as a sign that these are only effective field theories , omitting crucial phenomena relevant only at very high energies. ^{ [6] }
The final step in the graph requires resolving the separation between quantum mechanics and gravitation, often equated with general relativity. Numerous researchers concentrate their efforts on this specific step; nevertheless, no accepted theory of quantum gravity , and thus no accepted theory of everything, has emerged with observational evidence. It is usually assumed that the theory of everything will also solve the remaining problems of grand unified theories.
In addition to explaining the forces listed in the graph, a theory of everything may also explain the status of at least two candidate forces suggested by modern cosmology : an inflationary force and dark energy . Furthermore, cosmological experiments also suggest the existence of dark matter , supposedly composed of fundamental particles outside the scheme of the standard model. However, the existence of these forces and particles has not been proven.
String theory and Mtheory
Is string theory , superstring theory , or Mtheory , or some other variant on this theme, a step on the road to a "theory of everything", or just a blind alley?
Since the 1990s, some physicists such as Edward Witten believe that 11dimensional Mtheory , which is described in some limits by one of the five perturbative superstring theories , and in another by the maximally supersymmetric 11dimensional supergravity , is the theory of everything. There is no widespread consensus on this issue.
One remarkable property of string / Mtheory is that seven extra dimensions are required for the theory's consistency, on top of the four dimensions in our universe. In this regard, string theory can be seen as building on the insights of the Kaluza–Klein theory , in which it was realized that applying general relativity to a 5dimensional universe, with one space dimension small and curled up, looks from the 4dimensional perspective like the usual general relativity together with Maxwell's electrodynamics . This lent credence to the idea of unifying gauge and gravity interactions, and to extra dimensions, but did not address the detailed experimental requirements. Another important property of string theory is its supersymmetry , which together with extra dimensions are the two main proposals for resolving the hierarchy problem of the standard model , which is (roughly) the question of why gravity is so much weaker than any other force. The extradimensional solution involves allowing gravity to propagate into the other dimensions while keeping other forces confined to a 4dimensional spacetime, an idea that has been realized with explicit stringy mechanisms. ^{ [28] }
Research into string theory has been encouraged by a variety of theoretical and experimental factors. On the experimental side, the particle content of the standard model supplemented with neutrino masses fits into a spinor representation of SO(10) , a subgroup of E8 that routinely emerges in string theory, such as in heterotic string theory ^{ [29] } or (sometimes equivalently) in Ftheory . ^{ [30] } ^{ [31] } String theory has mechanisms that may explain why fermions come in three hierarchical generations, and explain the mixing rates between quark generations. ^{ [32] } On the theoretical side, it has begun to address some of the key questions in quantum gravity , such as resolving the black hole information paradox , counting the correct entropy of black holes ^{ [33] } ^{ [34] } and allowing for topology changing processes. ^{ [35] } ^{ [36] } ^{ [37] } It has also led to many insights in pure mathematics and in ordinary, stronglycoupled gauge theory due to the Gauge/String duality .
In the late 1990s, it was noted that one major hurdle in this endeavor is that the number of possible 4dimensional universes is incredibly large. The small, "curled up" extra dimensions can be compactified in an enormous number of different ways (one estimate is 10 ^{ 500 } ) each of which leads to different properties for the lowenergy particles and forces. This array of models is known as the string theory landscape . ^{ [17] } ^{ : 347 }
One proposed solution is that many or all of these possibilities are realized in one or another of a huge number of universes, but that only a small number of them are habitable. Hence what we normally conceive as the fundamental constants of the universe are ultimately the result of the anthropic principle rather than dictated by theory. This has led to criticism of string theory, ^{ [38] } arguing that it cannot make useful (i.e., original, falsifiable , and verifiable) predictions and regarding it as a pseudoscience / philosophy . Others disagree, ^{ [39] } and string theory remains an active topic of investigation in theoretical physics . ^{ [40] }
Loop quantum gravity
Current research on loop quantum gravity may eventually play a fundamental role in a theory of everything, but that is not its primary aim. ^{ [41] } Loop quantum gravity also introduces a lower bound on the possible length scales.
There have been recent claims that loop quantum gravity may be able to reproduce features resembling the Standard Model . So far only the first generation of fermions ( leptons and quarks ) with correct parity properties have been modelled by Sundance BilsonThompson using preons constituted of braids of spacetime as the building blocks. ^{ [42] } However, there is no derivation of the Lagrangian that would describe the interactions of such particles, nor is it possible to show that such particles are fermions, nor that the gauge groups or interactions of the Standard Model are realised. Utilization of quantum computing concepts made it possible to demonstrate that the particles are able to survive quantum fluctuations . ^{ [43] }
This model leads to an interpretation of electric and color charge as topological quantities (electric as number and chirality of twists carried on the individual ribbons and colour as variants of such twisting for fixed electric charge).
BilsonThompson's original paper suggested that the highergeneration fermions could be represented by more complicated braidings, although explicit constructions of these structures were not given. The electric charge, color, and parity properties of such fermions would arise in the same way as for the first generation. The model was expressly generalized for an infinite number of generations and for the weak force bosons (but not for photons or gluons) in a 2008 paper by BilsonThompson, Hackett, Kauffman and Smolin. ^{ [44] }
Other attempts
Among other attempts to develop a theory of everything is the theory of causal fermion systems , ^{ [45] } giving the two current physical theories ( general relativity and quantum field theory ) as limiting cases.
Another theory is called Causal Sets . As some of the approaches mentioned above, its direct goal isn't necessarily to achieve a theory of everything but primarily a working theory of quantum gravity, which might eventually include the standard model and become a candidate for a theory of everything. Its founding principle is that spacetime is fundamentally discrete and that the spacetime events are related by a partial order . This partial order has the physical meaning of the causality relations between relative past and future distinguishing spacetime events.
Causal dynamical triangulation does not assume any preexisting arena (dimensional space), but rather attempts to show how the spacetime fabric itself evolves.
Another attempt may be related to ER=EPR , a conjecture in physics stating that entangled particles are connected by a wormhole (or Einstein–Rosen bridge). ^{ [46] }
Present status
At present, there is no candidate theory of everything that includes the standard model of particle physics and general relativity and that, at the same time, is able to calculate the finestructure constant or the mass of the electron . ^{ [2] } Most particle physicists expect that the outcome of ongoing experiments – the search for new particles at the large particle accelerators and for dark matter – are needed in order to provide further input for a theory of everything.
Arguments against
In parallel to the intense search for a theory of everything, various scholars have seriously debated the possibility of its discovery.
Gödel's incompleteness theorem
A number of scholars claim that Gödel's incompleteness theorem suggests that any attempt to construct a theory of everything is bound to fail. Gödel's theorem, informally stated, asserts that any formal theory sufficient to express elementary arithmetical facts and strong enough for them to be proved is either inconsistent (both a statement and its denial can be derived from its axioms) or incomplete, in the sense that there is a true statement that can't be derived in the formal theory.
Stanley Jaki , in his 1966 book The Relevance of Physics , pointed out that, because any "theory of everything" will certainly be a consistent nontrivial mathematical theory, it must be incomplete. He claims that this dooms searches for a deterministic theory of everything. ^{ [47] }
Freeman Dyson has stated that "Gödel's theorem implies that pure mathematics is inexhaustible. No matter how many problems we solve, there will always be other problems that cannot be solved within the existing rules. […] Because of Gödel's theorem, physics is inexhaustible too. The laws of physics are a finite set of rules, and include the rules for doing mathematics, so that Gödel's theorem applies to them." ^{ [48] }
Stephen Hawking was originally a believer in the Theory of Everything, but after considering Gödel's Theorem, he concluded that one was not obtainable. "Some people will be very disappointed if there is not an ultimate theory that can be formulated as a finite number of principles. I used to belong to that camp, but I have changed my mind." ^{ [49] }
Jürgen Schmidhuber (1997) has argued against this view; he asserts that Gödel's theorems are irrelevant for computable physics. ^{ [50] } In 2000, Schmidhuber explicitly constructed limitcomputable, deterministic universes whose pseudorandomness based on undecidable , Gödellike halting problems is extremely hard to detect but does not at all prevent formal theories of everything describable by very few bits of information. ^{ [51] }
Related critique was offered by Solomon Feferman ^{ [52] } and others. Douglas S. Robertson offers Conway's game of life as an example: ^{ [53] } The underlying rules are simple and complete, but there are formally undecidable questions about the game's behaviors. Analogously, it may (or may not) be possible to completely state the underlying rules of physics with a finite number of welldefined laws, but there is little doubt that there are questions about the behavior of physical systems which are formally undecidable on the basis of those underlying laws.
Since most physicists would consider the statement of the underlying rules to suffice as the definition of a "theory of everything", most physicists argue that Gödel's Theorem does not mean that a theory of everything cannot exist. ^{ [ citation needed ] } On the other hand, the scholars invoking Gödel's Theorem appear, at least in some cases, to be referring not to the underlying rules, but to the understandability of the behavior of all physical systems, as when Hawking mentions arranging blocks into rectangles, turning the computation of prime numbers into a physical question. ^{ [54] } This definitional discrepancy may explain some of the disagreement among researchers.
Fundamental limits in accuracy
No physical theory to date is believed to be precisely accurate. Instead, physics has proceeded by a series of "successive approximations" allowing more and more accurate predictions over a wider and wider range of phenomena. Some physicists believe that it is therefore a mistake to confuse theoretical models with the true nature of reality, and hold that the series of approximations will never terminate in the "truth". ^{ [55] } Einstein himself expressed this view on occasions. ^{ [56] }
Definition of fundamental laws
There is a philosophical debate within the physics community as to whether a theory of everything deserves to be called the fundamental law of the universe. ^{ [57] } One view is the hard reductionist position that the theory of everything is the fundamental law and that all other theories that apply within the universe are a consequence of the theory of everything. Another view is that emergent laws, which govern the behavior of complex systems , should be seen as equally fundamental. Examples of emergent laws are the second law of thermodynamics and the theory of natural selection . The advocates of emergence argue that emergent laws, especially those describing complex or living systems are independent of the lowlevel, microscopic laws. In this view, emergent laws are as fundamental as a theory of everything.
The debates do not make the point at issue clear. Possibly the only issue at stake is the right to apply the highstatus term "fundamental" to the respective subjects of research. A wellknown debate over this took place between Steven Weinberg and Philip Anderson . ^{ [58] }
Impossibility of calculation
Weinberg ^{ [59] } points out that calculating the precise motion of an actual projectile in the Earth's atmosphere is impossible. So how can we know we have an adequate theory for describing the motion of projectiles? Weinberg suggests that we know principles (Newton's laws of motion and gravitation) that work "well enough" for simple examples, like the motion of planets in empty space. These principles have worked so well on simple examples that we can be reasonably confident they will work for more complex examples. For example, although general relativity includes equations that do not have exact solutions, it is widely accepted as a valid theory because all of its equations with exact solutions have been experimentally verified. Likewise, a theory of everything must work for a wide range of simple examples in such a way that we can be reasonably confident it will work for every situation in physics. Difficulties in creating a theory of everything often begin to appear when combining quantum mechanics with the theory of general relativity , as the equations of quantum mechanics begin to falter when the force of gravity is applied to them.
See also
 Absolute (philosophy) – Philosophical or theological concept
 Argument from beauty – argument for the existence of a realm of immaterial ideas or, most commonly, for the existence of God Pages displaying wikidata descriptions as a fallback
 Attractor – Concept in dynamical systems
 Beyond black holes – Area of study
 Beyond the standard model – Theories trying to extend known physics Pages displaying short descriptions of redirect targets
 cGh physics
 Chronology of the universe – History and future of the universe
 ER=EPR – Conjencture unifying entanglement and wormholes Pages displaying short descriptions of redirect targets
 Grand Unified Theory – Any particle physics model that theorizes the merging of the electromagnetic, weak and strong forces
 Holographic principle – Physics inside a bounded region is fully captured by physics at the boundary of the region
 List of unsolved problems in mathematics
 List of unsolved problems in neuroscience
 List of unsolved problems in physics
 Mathematical beauty – Aesthetic value of mathematics
 Mathematical universe hypothesis – Cosmological theory
 Multiverse – Hypothetical group of multiple universes
 Penrose interpretation – objective collapse theory that uncertainty in spacetime curvature causes collapse of the quantum state Pages displaying wikidata descriptions as a fallback
 Standard Model (mathematical formulation) – Mathematics of a particle physics model Pages displaying short descriptions of redirect targets
 Superfluid vacuum theory – Theory of fundamental physics (SVT)
 The Theory of Everything – 2014 biographical film of the life of Stephen Hawking
 Timeline of the Big Bang – History and future of the universe Pages displaying short descriptions of redirect targets
 Unification – idea of connecting all of physics into one set of equations Pages displaying wikidata descriptions as a fallback
 Zeroenergy universe – Hypothesis that the total amount of energy in the universe is exactly zero
References
 ↑ Steven Weinberg (20110420). Dreams of a Final Theory: The Scientist's Search for the Ultimate Laws of Nature . Knopf Doubleday Publishing Group. ISBN 9780307787866 .
 1 2 Overbye, Dennis (23 November 2020). "Can a Computer Devise a Theory of Everything?  It might be possible, physicists say, but not anytime soon. And there's no guarantee that we humans will understand the result" . The New York Times . Archived from the original on 23 November 2020 . Retrieved 23 November 2020 .
 ↑ Overbye, Dennis (24 January 2023). "Where is Physics Headed (and How Soon Do We Get There)?  Two leading scientists discuss the future of their field  Comment" . The New York Times . Archived from the original on 25 January 2023 . Retrieved 28 January 2023 .
 ↑ Stephen W. Hawking (28 February 2006). The Theory of Everything: The Origin and Fate of the Universe . Phoenix Books; Special Anniv. ISBN 9781597775083 .
 ↑ SMOLIN, L. (2004). "An Invitation to Loop Quantum Gravity" . Quantum Theory and Symmetries . [] : 655–682. arXiv : hepth/0408048 . Bibcode : 2004qts..conf..655S . doi : 10.1142/9789812702340_0078 . ISBN 9789812560681 . S2CID 16195175 .
 1 2 Carlip, Steven (2001). "Quantum Gravity: a Progress Report". Reports on Progress in Physics . 64 (8): 885–942. arXiv : grqc/0108040 . Bibcode : 2001RPPh...64..885C . doi : 10.1088/00344885/64/8/301 . S2CID 118923209 .
 ↑ Susanna Hornig Priest (14 July 2010). Encyclopedia of Science and Technology Communication . SAGE Publications. ISBN 9781452265780 .
 ↑ Overbye, Dennis (10 October 2022). "Black Holes May Hide a MindBending Secret About Our Universe  Take gravity, add quantum mechanics, stir. What do you get? Just maybe, a holographic cosmos" . The New York Times . Archived from the original on 16 November 2022 . Retrieved 22 October 2022 .
 ↑ Starr, Michelle (16 November 2022). "Scientists Created a Black Hole in The Lab, And Then It Started to Glow" . ScienceAlert . Archived from the original on 15 November 2022 . Retrieved 16 November 2022 .
 ↑ Fritzsch, Harald (1977). "THE WORLD OF FLAVOUR AND COLOUR". CERN Report . Ref.TH.2359CERN. (download at https://cds.cern.ch/record/875256/files/CMP00061728.pdf Archived 20200212 at the Wayback Machine )
 ↑ Ellis, John (2002). "Physics gets physical (correspondence)" . Nature . 415 (6875): 957. Bibcode : 2002Natur.415..957E . doi : 10.1038/415957b . PMID 11875539 .
 ↑ Ellis, John (1986). "The Superstring: Theory of Everything, or of Nothing?". Nature . 323 (6089): 595–598. Bibcode : 1986Natur.323..595E . doi : 10.1038/323595a0 . S2CID 4344940 .
 ↑ Hodge, John C. (2012). Theory of Everything: Scalar Potential Model of the Big and the Small . CreateSpace Independent Publishing Platform. pp. 1–13, 99. ISBN 9781469987361 .

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. Routledge. p.
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: CS1 maint: uses authors parameter ( link )  ↑ Andrew Zimmerman Jones (2009). String Theory For Dummies . John Wiley & Sons. p. 262. ISBN 9780470595848 .

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.
{{ cite book }}
: CS1 maint: uses authors parameter ( link )  1 2 Chris Impey (26 March 2012). How It Began: A TimeTraveler's Guide to the Universe . W. W. Norton. ISBN 9780393080025 .
 ↑ William E. Burns (1 January 2001). The Scientific Revolution: An Encyclopedia . ABCCLIO. ISBN 9780874368758 .
 ↑ Shapin, Steven (1996). The Scientific Revolution . University of Chicago Press . ISBN 9780226750217 .
 ↑ Newton, Sir Isaac (1729). The Mathematical Principles of Natural Philosophy . Vol. II. p. 255.
 ↑ Sean Carroll (2010). From Eternity to Here: The Quest for the Ultimate Theory of Time . Penguin Group US. ISBN 9781101152157 .
 ↑ Faraday, M. (1850). "Experimental Researches in Electricity. TwentyFourth Series. On the Possible Relation of Gravity to Electricity" . Abstracts of the Papers Communicated to the Royal Society of London . 5 : 994–995. doi : 10.1098/rspl.1843.0267 .
 ↑ Gorban, Alexander N.; Karlin, Ilya (2013). "Hilbert's 6th Problem: Exact and approximate hydrodynamic manifolds for kinetic equations". Bulletin of the American Mathematical Society . 51 (2): 187. arXiv : 1310.0406 . Bibcode : 2013arXiv1310.0406G . doi : 10.1090/S027309792013014393 . S2CID 7228220 .
 ↑ Dirac, P.A.M. (1929). "Quantum mechanics of manyelectron systems" . Proceedings of the Royal Society of London A . 123 (792): 714–733. Bibcode : 1929RSPSA.123..714D . doi : 10.1098/rspa.1929.0094 .
 ↑ Majer, U.; Sauer, T. (2005). Hilbert's "World Equations" and His Vision of a Unified Science . Einstein Studies. Vol. 11. pp. 259–276. arXiv : physics/0405110 . Bibcode : 2005ugr..book..259M . doi : 10.1007/0817644547_14 . ISBN 9780817644543 . S2CID 985751 .
 ↑ Abraham Pais (23 September 1982). Subtle is the Lord : The Science and the Life of Albert Einstein: The Science and the Life of Albert Einstein . Oxford University Press. ISBN 9780191524028 .
 ↑ Weinberg (1993), Ch. 5
 ↑ Holloway, M (2005). "The Beauty of Branes" (PDF) . Scientific American . 293 (4): 38–40. Bibcode : 2005SciAm.293d..38H . doi : 10.1038/scientificamerican100538 . PMID 16196251 . Archived from the original (PDF) on November 22, 2014 . Retrieved August 13, 2012 .
 ↑ Nilles, Hans Peter; RamosSánchez, Saúl; Ratz, Michael; Vaudrevange, Patrick K. S. (2009). "From strings to the MSSM". The European Physical Journal C . 59 (2): 249–267. arXiv : 0806.3905 . Bibcode : 2009EPJC...59..249N . doi : 10.1140/epjc/s1005200807401 . S2CID 17452924 .
 ↑ Beasley, Chris; Heckman, Jonathan J; Vafa, Cumrun (2009). "GUTs and exceptional branes in Ftheory — I". Journal of High Energy Physics . 2009 (1): 058. arXiv : 0802.3391 . Bibcode : 2009JHEP...01..058B . doi : 10.1088/11266708/2009/01/058 . S2CID 119309173 .
 ↑ Donagi, Ron; Wijnholt, Martijn (2008). "Model Building with FTheory". arXiv : 0802.2969v3 [ hepth ].
 ↑ Heckman, Jonathan J.; Vafa, Cumrun (2010). "Flavor Hierarchy from Ftheory". Nuclear Physics B . 837 (1): 137–151. arXiv : 0811.2417 . Bibcode : 2010NuPhB.837..137H . doi : 10.1016/j.nuclphysb.2010.05.009 . S2CID 119244083 .
 ↑ Strominger, Andrew; Vafa, Cumrun (1996). "Microscopic origin of the BekensteinHawking entropy". Physics Letters B . 379 (1–4): 99–104. arXiv : hepth/9601029 . Bibcode : 1996PhLB..379...99S . doi : 10.1016/03702693(96)003450 . S2CID 1041890 .
 ↑ Horowitz, Gary. "The Origin of Black Hole Entropy in String Theory". arXiv : grqc/9604051 .
 ↑ Greene, Brian R.; Morrison, David R.; Strominger, Andrew (1995). "Black hole condensation and the unification of string vacua". Nuclear Physics B . 451 (1–2): 109–120. arXiv : hepth/9504145 . Bibcode : 1995NuPhB.451..109G . doi : 10.1016/05503213(95)00371X . S2CID 11145691 .
 ↑ Aspinwall, Paul S.; Greene, Brian R.; Morrison, David R. (1994). "CalabiYau moduli space, mirror manifolds and spacetime topology change in string theory". Nuclear Physics B . 416 (2): 414. arXiv : hepth/9309097 . Bibcode : 1994NuPhB.416..414A . doi : 10.1016/05503213(94)903212 . S2CID 10927539 .
 ↑ Adams, Allan ; Liu, Xiao; McGreevy, John; Saltman, Alex; Silverstein, Eva (2005). "Things fall apart: Topology change from winding tachyons". Journal of High Energy Physics . 2005 (10): 033. arXiv : hepth/0502021 . Bibcode : 2005JHEP...10..033A . doi : 10.1088/11266708/2005/10/033 . S2CID 14320855 .
 ↑ Smolin, Lee (2006). The Trouble With Physics: The Rise of String Theory, the Fall of a Science, and What Comes Next . Houghton Mifflin. ISBN 9780618551057 .
 ↑ Duff, M. J. (2011). "String and MTheory: Answering the Critics". Foundations of Physics . 43 (1): 182–200. arXiv : 1112.0788 . Bibcode : 2013FoPh...43..182D . doi : 10.1007/s1070101196184 . S2CID 55066230 .
 ↑ Chui, Glennda (May 1, 2007). "The Great String Debate" . Symmetry Magazine . Archived from the original on 20181017 . Retrieved 20181017 .
 ↑ Potter, Franklin (15 February 2005). "Leptons And Quarks In A Discrete Spacetime" (PDF) . Frank Potter's Science Gems . Archived (PDF) from the original on 20210309 . Retrieved 20091201 .
 ↑ BilsonThompson, Sundance O.; Markopoulou, Fotini; Smolin, Lee (2007). "Quantum gravity and the standard model". Classical and Quantum Gravity . 24 (16): 3975–3994. arXiv : hepth/0603022 . Bibcode : 2007CQGra..24.3975B . doi : 10.1088/02649381/24/16/002 . S2CID 37406474 .
 ↑ Castelvecchi, Davide; Valerie Jamieson (August 12, 2006). "You are made of spacetime" . New Scientist (2564). Archived from the original on February 9, 2008 . Retrieved September 16, 2017 .
 ↑ Sundance BilsonThompson; Jonathan Hackett; Lou Kauffman; Lee Smolin (2008). "Particle Identifications from Symmetries of Braided Ribbon Network Invariants". arXiv : 0804.0037 [ hepth ].
 ↑ F. Finster; J. Kleiner (2015). "Causal fermion systems as a candidate for a unified physical theory". Journal of Physics: Conference Series . 626 (2015): 012020. arXiv : 1502.03587 . Bibcode : 2015JPhCS.626a2020F . doi : 10.1088/17426596/626/1/012020 . S2CID 33471826 .
 ↑ Cowen, Ron (16 November 2015). "The quantum source of spacetime". Nature . 527 (7578): 290–293. Bibcode : 2015Natur.527..290C . doi : 10.1038/527290a . PMID 26581274 . S2CID 4447880 .
 ↑ Jaki, S.L. (1966). The Relevance of Physics . Chicago Press. pp. 127–130.
 ↑ Freeman Dyson, NYRB, May 13, 2004
 ↑ Stephen Hawking, Gödel and the end of physics Archived 20200529 at the Wayback Machine , July 20, 2002
 ↑ Schmidhuber, Jürgen (1997). A Computer Scientist's View of Life, the Universe, and Everything. Lecture Notes in Computer Science . Lecture Notes in Computer Science. Vol. 1337. Springer . pp. 201–208. CiteSeerX 10.1.1.580.1970 . doi : 10.1007/BFb0052071 . ISBN 9783540637462 . S2CID 21317070 . Archived from the original on 20140227 . Retrieved 20080326 .
 ↑ Schmidhuber, Jürgen (2002). "Hierarchies of generalized Kolmogorov complexities and nonenumerable universal measures computable in the limit". International Journal of Foundations of Computer Science . 13 (4): 587–612. arXiv : quantph/0011122 . Bibcode : 2000quant.ph.11122S . doi : 10.1142/s0129054102001291 .
 ↑ Feferman, Solomon (17 November 2006). "The nature and significance of Gödel's incompleteness theorems" (PDF) . Institute for Advanced Study . Archived (PDF) from the original on 20081217 . Retrieved 20090112 .
 ↑ Robertson, Douglas S. (2007). "Goedel's Theorem, the Theory of Everything, and the Future of Science and Mathematics". Complexity . 5 (5): 22–27. Bibcode : 2000Cmplx...5e..22R . doi : 10.1002/10990526(200005/06)5:5 < 22::AIDCPLX4 > 3.0.CO;20 .
 ↑ Hawking, Stephen (20 July 2002). "Gödel and the end of physics" . Archived from the original on 20110521 . Retrieved 20091201 .
 ↑ results, search (17 December 2006). The New Cosmic Onion: Quarks and the Nature of the Universe . CRC Press. ISBN 9781584887980 .
 ↑ Einstein, letter to Felix Klein, 1917. (On determinism and approximations.) Quoted in Pais (1982), Ch. 17.
 ↑ Weinberg (1993), Ch 2.
 ↑ Superstrings, Pbranes and Mtheory . p. 7.
 ↑ Weinberg (1993) p. 5
Bibliography
 Pais, Abraham (1982) Subtle is the Lord: The Science and the Life of Albert Einstein (Oxford University Press, Oxford, . Ch. 17, ISBN 019853907X
 Weinberg, Steven (1993) Dreams of a Final Theory: The Search for the Fundamental Laws of Nature , Hutchinson Radius, London, ISBN 0091773954
 Corey S. Powell Relativity versus quantum mechanics: the battle for the universe , The Guardian (2015) Relativity versus quantum mechanics: the battle for the universe
External links
 The Elegant Universe , Nova episode about the search for the theory of everything and string theory.
 Theory of Everything , freeview video by the Vega Science Trust , BBC and Open University .
 The Theory of Everything : Are we getting closer, or is a final theory of matter and the universe impossible? Debate between John Ellis (physicist) , Frank Close and Nicholas Maxwell .
 Why The World Exists , a discussion between physicist Laura MersiniHoughton , cosmologist George Francis Rayner Ellis and philosopher David Wallace about dark matter, parallel universes and explaining why these and the present Universe exist.
 Theories of Everything , BBC Radio 4 discussion with Brian Greene, John Barrow & Val Gibson ( In Our Time , Mar. 25, 2004)
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