Theory of everything
A theory of everything (ToE) or final theory, ultimate theory, or master theory is a hypothetical single, allencompassing, coherent theoretical framework of physics that fully explains and links together all physical aspects of the universe.^{[1]}^{:6} Finding a ToE is one of the major unsolved problems in physics. Over the past few centuries, two theoretical frameworks have been developed that, as a whole, most closely resemble a ToE. These two theories upon which all modern physics rests are general relativity (GR) and quantum field theory (QFT). GR is a theoretical framework that only focuses on gravity for understanding the universe in regions of both largescale and highmass: stars, galaxies, clusters of galaxies, etc. On the other hand, QFT is a theoretical framework that only focuses on three nongravitational forces for understanding the universe in regions of both small scale and low mass: subatomic particles, atoms, molecules, etc. QFT successfully implemented the Standard Model and unified the interactions (socalled Grand Unified Theory) between the three nongravitational forces: weak, strong, and electromagnetic force.^{[2]}^{:122}
Through years of research, physicists have experimentally confirmed with tremendous accuracy virtually every prediction made by these two theories when in their appropriate domains of applicability. In accordance with their findings, scientists also learned that GR and QFT, as they are currently formulated, are mutually incompatible – they cannot both be right. Since the usual domains of applicability of GR and QFT are so different, most situations require that only one of the two theories be used.^{[3]}^{[4]}^{:842–844} As it turns out, this incompatibility between GR and QFT is only an apparent issue in regions of extremely smallscale and highmass, 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 this conflict, a theoretical framework revealing a deeper underlying reality, unifying gravity with the other three interactions, must be discovered to harmoniously integrate the realms of GR and QFT into a seamless whole: a single theory that, in principle, is capable of describing all phenomena. In pursuit of this goal, quantum gravity has recently become an area of active research.
Over the past few decades, a single explanatory framework, called “string theory“, has emerged that intends to be the ultimate theory of the universe. Some physicists believe 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 microscopic level (Planck length), consists of varying combinations of vibrating strings (or strands) with preferred patterns of vibration. String theory 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 upquark is a type of string vibrating another way, and so forth).
Initially, the term theory of everything was used with an ironic connotation to refer 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 John Ellis^{[5]} claims to have introduced the term into the technical literature in an article in Nature in 1986.^{[6]} Over time, the term stuck in popularizations of theoretical physics research.
Contents
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.^{[13]} 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.^{[14]}
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”.^{[15]}
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 thirtyyear 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 these last few decades of his life, this quixotic quest isolated Einstein from the mainstream of physics. Understandably, the mainstream was instead far more excited about the newly 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, Theodor Kaluza, Oskar Klein, and most notably, Albert Einstein and his collaborators. Einstein intensely searched for, but ultimately failed to find, a unifying theory.^{[16]}^{:ch 17} (But see:Einstein–Maxwell–Dirac equations.) More than a half a century later, Einstein’s dream of discovering a unified theory has become the Holy Grail of modern physics.
Twentieth century and the nuclear interactions
In the twentieth century, the search for a unifying theory was interrupted by the discovery of the strong and weak nuclear forces (or interactions), which differ both from gravity and from electromagnetism. A further hurdle was the acceptance that in a ToE, quantum mechanics had to be incorporated from the start, rather than emerging as a consequence of a deterministic unified theory, as Einstein had hoped.
Gravity and electromagnetism could always peacefully coexist as entries in a list of classical forces, but for many years it seemed that gravity could not even be incorporated into the quantum framework, let alone unified with the other fundamental forces. For this reason, work on unification, for much of the twentieth century, focused on understanding the three “quantum” forces: 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.^{[17]} 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 of 80.4 GeV/c^{2} and 91.2 GeV/c^{2}, whereas the photon, which carries the electromagnetic force, is massless. At higher energies Ws and Zs can be created easily and the unified nature of the force becomes apparent.
While the strong and electroweak forces peacefully coexist in the Standard Model of particle physics, they remain distinct. So far, the quest for a theory of everything is thus unsuccessful on two points: neither a unification of the strong and electroweak forces – which Laplace would have called ‘contact forces’ – has been achieved, nor has a unification of these forces with gravitation been achieved.
Modern physics
Conventional sequence of theories
A Theory of Everything would unify all the fundamental interactions of nature: gravitation, strong interaction, weak interaction, and electromagnetism. Because the weak interaction can transform elementary particles from one kind into another, the ToE should also yield a deep understanding of the various different kinds of possible particles. The usual assumed path of theories is given in the following graph, where each unification step leads one level up:




Theory of everything 
















Quantum gravity 













Space Curvature 




Electronuclear force (GUT) 





















Standard model of cosmology 



Standard model of particle physics  

















Strong interaction SU(3) 





Electroweak interaction SU(2) x U(1)_{Y} 
































Weak interaction 




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 possible Earthbased particle accelerator. Although the simplest GUTs have been experimentally ruled out, the general idea, especially when linked with supersymmetry, remains a favorite candidate in the theoretical physics community. Supersymmetric GUTs 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 GUT physics (although it does not seem to form an inevitable part of the theory). Yet GUTs 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.^{[3]}
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 yet. It is usually assumed that the ToE will also solve the remaining problems of GUTs.
In addition to explaining the forces listed in the graph, a ToE 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 yet.
String theory and Mtheory[edit]
Unsolved problem in physics:
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?
(more unsolved problems in physics) 
Since the 1990s, some physicists^{[who?]} believe that 11dimensional Mtheory, which is described in some limits by one of the five perturbative superstring theories, and in another by the maximallysupersymmetric 11dimensional supergravity, is the theory of everything. However, there is no widespread consensus on this issue.
A surprising property of string/Mtheory is that extra dimensions are required for the theory’s consistency. 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 fivedimensional universe (with one of them small and curled up) looks from the fourdimensional 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 fourdimensional spacetime, an idea that has been realized with explicit stringy mechanisms.^{[18]}
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^{[19]} or (sometimes equivalently) in Ftheory.^{[20]}^{[21]} String theory has mechanisms that may explain why fermions come in three hierarchical generations, and explain the mixing rates between quark generations.^{[22]} 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^{[23]}^{[24]} and allowing for topologychanging processes.^{[25]}^{[26]}^{[27]} 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 fourdimensional 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.^{[8]}^{:347}
One proposed solution is that many or all of these possibilities are realised in one or another of a huge number of universes, but that only a small number of them are habitable, and hence 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,^{[28]} arguing that it cannot make useful (i.e., original, falsifiable, and verifiable) predictions and regarding it as a pseudoscience. Others disagree,^{[29]} and string theory remains an extremely active topic of investigation in theoretical physics.^{[citation needed]}
Loop quantum gravity[edit]
Current research on loop quantum gravity may eventually play a fundamental role in a ToE, but that is not its primary aim.^{[30]} Also loop quantum gravity 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.^{[31]} 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.^{[32]}
This model leads to an interpretation of electric and colour 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, colour, 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.^{[33]}
Other attempts[edit]
A recent development is the theory of causal fermion systems,^{[34]} giving all three current physical theories (quantum mechanics, general relativity and quantum field theory) as limiting cases.
A recent and very prolific attempt is called Causal Sets. As some of the approaches mentioned above, its direct goal isn’t necessarily to achieve a ToE but primarily a working theory of quantum gravity, which might eventually include the standard model and become a candidate for a ToE. 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.
Outside the previously mentioned attempts there is Garrett Lisi’s E8 proposal. This theory provides an attempt of identifying general relativity and the standard model within the Lie group E8. The theory doesn’t provide a novel quantization procedure and the author suggests its quantization might follow the Loop Quantum Gravity approach above mentioned.^{[35]}
Christoph Schiller’s Strand Model attempts to account for the gauge symmetry of the Standard Model of particle physics, U(1)×SU(2)×SU(3), with the three Reidemeister moves of knot theory by equating each elementary particle to a different tangle of one, two, or three strands (selectively a long prime knot or unknotted curve, a rational tangle, or a braided tangle respectively).
Present status[edit]
At present, there is no candidate theory of everything that includes the standard model of particle physics and general relativity. For example, no candidate theory is able to calculate the fine structure constant or the mass of the electron. Most particle physicists expect that the outcome of the 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 ToE.
Theory of everything and philosophy[edit]
The philosophical implications of a physical ToE are frequently debated. For example, if philosophical physicalism is true, a physical ToE will coincide with a philosophical theory of everything.
The “system building” style of metaphysics attempts to answer all the important questions in a coherent way, providing a complete picture of the world. Plato and Aristotle could be said to have created early examples of comprehensive systems. In the early modern period (17th and 18th centuries), the systembuilding scope of philosophy is often linked to the rationalist method of philosophy, which is the technique of deducing the nature of the world by pure a priori reason. Examples from the early modern period include the Leibniz‘s Monadology, Descarte‘s Dualism, and Spinoza‘s Monism. Hegel‘s Absolute idealism and Whitehead‘s Process philosophy were later systems.
Arguments against a theory of everything[edit]
In parallel to the intense search for a ToE, various scholars have seriously debated the possibility of its discovery.
Gödel’s incompleteness theorem[edit]
A number of scholars claim that Gödel’s incompleteness theorem suggests that any attempt to construct a ToE is bound to fail. Gödel’s theorem, informally stated, asserts that any formal theory expressive enough for elementary arithmetical facts to be expressed 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.^{[36]} In a later reflection, Jaki states that it is wrong to say that a final theory is impossible, but rather that “when it is on hand one cannot know rigorously that it is a final theory.”^{[37]}
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.”^{[38]}
Stephen Hawking was originally a believer in the Theory of Everything but, after considering Gödel’s Theorem, 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.”^{[39]}
Jürgen Schmidhuber (1997) has argued against this view; he points out that Gödel’s theorems are irrelevant for computable physics.^{[40]} 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 ToEs describable by very few bits of information.^{[41]}
Related critique was offered by Solomon Feferman,^{[42]} among others. Douglas S. Robertson offers Conway’s game of life as an example:^{[43]} 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 ToE cannot exist. 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.^{[44]} This definitional discrepancy may explain some of the disagreement among researchers.
Fundamental limits in accuracy[edit]
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”. Einstein himself expressed this view on occasions.^{[45]} Following this view, we may reasonably hope for a theory of everything which selfconsistently incorporates all currently known forces, but we should not expect it to be the final answer.
On the other hand, it is often claimed that, despite the apparently everincreasing complexity of the mathematics of each new theory, in a deep sense associated with their underlying gauge symmetry and the number of fundamental physical constants, the theories are becoming simpler. If this is the case, the process of simplification cannot continue indefinitely.
Lack of fundamental laws[edit]
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.^{[46]} One view is the hard reductionist position that the ToE is the fundamental law and that all other theories that apply within the universe are a consequence of the ToE. 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 ToE.
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 one took place between Steven Weinberg and Philip Anderson^{[citation needed]}
Impossibility of being “of everything”[edit]
Although the name “theory of everything” suggests the determinism of Laplace’s quotation, this gives a very misleading impression. Determinism is frustrated by the probabilistic nature of quantum mechanical predictions, by the extreme sensitivity to initial conditions that leads to mathematical chaos, by the limitations due to event horizons, and by the extreme mathematical difficulty of applying the theory. Thus, although the current standard model of particle physics “in principle” predicts almost all known nongravitational phenomena, in practice only a few quantitative results have been derived from the full theory (e.g., the masses of some of the simplest hadrons), and these results (especially the particle masses which are most relevant for lowenergy physics) are less accurate than existing experimental measurements. The ToE would almost certainly be even harder to apply for the prediction of experimental results, and thus might be of limited use.
A motive for seeking a ToE,^{[citation needed]} apart from the pure intellectual satisfaction of completing a centurieslong quest, is that prior examples of unification have predicted new phenomena, some of which (e.g., electrical generators) have proved of great practical importance. And like in these prior examples of unification, the ToE would probably allow us to confidently define the domain of validity and residual error of lowenergy approximations to the full theory.
Infinite number of onion layers[edit]
Lee Smolin regularly argues that the layers of nature may be like the layers of an onion, and that the number of layers might be infinite.^{[citation needed]} This would imply an infinite sequence of physical theories.
The argument is not universally accepted, because it is not obvious that infinity is a concept that applies to the foundations of nature.
Impossibility of calculation[edit]
Weinberg^{[47]} 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 ToE 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.013014393.
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