Questions tagged [theory-of-everything]

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Could there have been primeval energy associated with the primeval particle?

I was researching up on the big bang theory and came across the primeval atom hypothesis. I know that nothing is known of this time period but I was wondering hypothetically is it is possible. I am a ...
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2answers
124 views

Why is string theory considered the best candidate for quantum gravity if it cannot resolve singularities? [closed]

The reason we want a theory of quantum gravity is to be able to understand singularities like the big bang and black holes. However the best candidate so far for such a theory, string theory, does not ...
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0answers
45 views

General relativity and standard model [duplicate]

People use to say that the general relativity is not compatible with the other 3 fundamental interactions, is it true? I consider general relativity fundamental, have I to change my idea? I mean we ...
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1answer
62 views

Physical principles and their rigidity

In many of his talks and interviews, Nima Arkani-Hamed mentions how incredibly constrained are the laws of physics. For example, in a recent interview he says: “[I]f we just took these general ...
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1answer
804 views

What is Eric Weinstein's Geometric Unity theory? [closed]

I can usually follow the basic ideas of a theory, but Weinstein's Geometric Unity theory is completely incomprehensible to me. It leads me to suspect that it is high level crackpottery, but he seems ...
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3answers
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Why is Standard Model + Loop Quantum Gravity usually not listed as a theory of everything

I have often seeen statements on physics.SE such as, The only consistent theory of everything which we know of to date (2013) is string theory. Why exactly is this so? Adding the Loop Quantum ...
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2answers
480 views

What does Lee Smolin mean when he says that the most fundamental theory can have no symmetries?

Quote from Lee Smolin in Scientific American: There are some lazy ideas about unification that reflect uncritical thinking, such as the idea that the more fundamental a phenomena [sic] is the more ...
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4answers
2k views

What is a good non-technical introduction to theories of everything?

I'm not a physicist but I'm interested in unified theories, and I do not know how to start learning about it. What would be a good book to read to start learning about this topic?
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5answers
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String Theory and Standard Model in CERN

I don't know how to say it, but in the TV dominatrices and the popular science books we see the string theory as "the best theory to explain everything", and as "the only game in town"... etc. And ...
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2answers
371 views

How to check Einstein-like equations on their correspondence with the real world?

Physicists studying the foundations of physics and some mathematicians sometimes look at theories which are similar to general-relativity, but do not coincide with it. Often these theories contradict ...
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2answers
123 views

Is anyone attempting to disprove the existence of ToE? (Formerly: Is there necessarily a theory of everything?) [closed]

Does the following claim have a proof? Theorem: There exists a theory of everything. [edit: Added the following to hopefully clarify what I’m driving at.] Is any physicist working on proving the ...
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4answers
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Equation of everything

Is this equation in the image true? Can you give some topics that I can cover the equation? Similar equation from http://www.preposterousuniverse.com:
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4answers
234 views

Why search for a renormalizable theory of quantum gravity?

I recently heard a talk at my university about the search for a renormalizable theory of quantum gravity. I then asked myself the following question: Isn't the reason that we need to regularize and ...
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1answer
77 views

What question is it that theoretical physics are trying to solve?

The so-called Ultimate Question is the question whose answer is a Theory-of-Everything. The trouble is that as far as I can tell theoretical physics are not certain what the question is they're trying ...
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0answers
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Does Chew's bootstrap idea accept the possibility that there may be infinitely many possible laws of physics?

Physicist Geoffrey Chew proposed the concept of bootstrap (related to S-matrix theory) where he denied that fundamental laws of nature existed at all, as it is indicated in a writing in his memory ...
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3answers
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Have any of the new predictions made by LQG been experimentally verified?

A wikipedia template lists under the heading "fully compatible with observation": Einstein-Cartan theory, Gauge theory gravity, Teleparalleism and Euclidean Quantum Gravity. Does this claim generally ...
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2answers
44 views

Relationship between physical scale and certainty

Partially motivated by this question, I get the impression that it is generally more difficult to make accurate statistical predictions in Physics about "the small" (microscopic phenomena) ...
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2answers
79 views

Combining gravity with other forces [duplicate]

We all know we have 4 fundamental forces, and among them we can combine 3 forces but not gravity as in Standard model and some other. But force is something we can measure, as Einstein told us in ...
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0answers
31 views

Why is a unified field theory necessary? [duplicate]

I have read almost everywhere that the biggest questions in physics is to unify all the fundamental forces but I simply do not understand why do the forces have to follow a same set of rules or why is ...
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2answers
809 views

Can a theory of everything solve the oldest problem of turbulence? [closed]

Can a theory of everything solve the oldest problem of turbulence? Can we have unified theory of universe without solving the problem of turbulence?
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2answers
244 views

Elementary particles

That's what Wikipedia says about Elementary Particle: In particle physics, an elementary particle or fundamental particle is a particle whose substructure is unknown, thus it is not known to be ...
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3answers
356 views

Are standard QFT and general relativity contradictory?

My professors say it's only a matter of finding the right mathematical formalism to unite GR and QFT, and that new physics can only possibly be found on extremely high energies and small scales. they ...
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1answer
101 views

Why is there a possibility for unification of GR and quantum mechanics when they are fundamentally in contradiction?

To me it's quite obvious that these theories are mutually exclusive simply by fundamental logic. QM at its very core is dependent on flat spacetime background and its implied conservation laws (...
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1answer
107 views

Can the foundation of physics be completed? [closed]

The current foundation of physics is not complete because two parts of it, namely General Relativity (GR) and Quantum Mechanics (QM), are not compatible. But why should we believe that it can be ...
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1answer
145 views

Unification of Electromagnetism and Gravitation [closed]

Is it true that this can be accomplished in 5 dimensions? (Kaluza-Klein model) It seems that Einstein liked this idea but it didn't completely unify all forces. Recent commentators say that this ...
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4answers
136 views

How do you do science on Theories of Everything? [closed]

A theory of everything will always have an explanation for why the observed world fits into it's explanation. So cries of "it's not falsifiable!" don't really add anything to the discourse. Of course ...
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0answers
54 views

What are all the features required for a Quantum theory of gravity? [closed]

I do understand why are we seeking Theory of Quantum Gravity. What I am specifically asking is if there was a Theory of Quantum Gravity what would be its key features. Such as when would it be ...
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1answer
83 views

Is it possible that a perfect mathematical model of the universe doesn't exist? [closed]

Up until now, we have tried to introduce mathematical models to explain physical phenomenon. But we're still struggling to explain many observations with those models. Universe is supposedly infinite, ...
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3answers
416 views

Can all laws of physics derived by a single or lists of more general laws?

I have always been curious about deriving thousands of laws from more general ones. Can general laws or models of physics explain minor concepts completely? For instance, can Standard Model explain,...
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2answers
689 views

Does the universe follow a general physical and computational principle of evolution? [closed]

Evolution is a principle in biology, whereby organisms evolve their ability to replicate and multiply in numbers over successive generations. From a computational point of view, the organisms employ a ...
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81 views

What would be the mathematical features of a theory of everything?

GR and QFT are both axiomatic systems, right? If their axioms are logically independent, and a number of them are absolutely true in describing the universe, i.e. non-removable from a TOE, is there ...
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2answers
273 views

Why in physics does one ask increasingly fundamental questions of matter? [closed]

Many physicists seek to understand grand theories of everything by reduction to smaller components or building blocks. Those trained, but maybe are not practicing talk about the importance of "first ...
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1answer
119 views

Brute-forcing the theory of everything [closed]

If brute force doesn't work, you're probably just not using enough of it. That's especially true for guessing combinations of stuff, like characters in a password. Assuming some combination of ...
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1answer
218 views

Gödel undecidability in physics [duplicate]

According to Gödel's Incompleteness theorems, there exist problems in any sufficiently powerful, consistent system of arithmetic that are undecidable form the axioms of said system. *What known ...
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3answers
374 views

Does string theory accommodate effects of dark energy?

String theory is arguably, among best candidates for a Theory of Everything. So, because every TOE is an attempt to bind together the big and very small effects and things, a TOE must be able to ...
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0answers
1k views

Loop-Quantum Gravity versus String Theory [closed]

Basically asking what were the motives behind each theory. What was it that led physicists toward these ideas?
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1answer
459 views

How does physics research work? [closed]

I am going to try and be as short and as concise as possible. I was thinking these last few days about how we're still trying to discover a unified Theory of Everything. The question is: how is this ...
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2answers
160 views

What is the motivation for developing a "theory of everything"?

What is the reason physicists are working so hard looking for a "theory of everything" and trying to unify gravity with quantum mechanics? Historically, new theories were always developed to explain ...
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2answers
514 views

Is $E_8$ theory any close to reality by any means? [closed]

The E8 theory from Wikipedia: "An Exceptionally Simple Theory of Everything" is a physics preprint proposing a basis for a unified field theory, often referred to as "E8 Theory", which attempts to ...
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1answer
236 views

Why Einstein's unified field theory is believed not to work?

In his later life, Albert Einstein was trying to extend his general theory of relativity to incorporate electromagnetism and other fundamental forces with it, something he himself called "The theory ...
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1answer
679 views

Why are we trying to fit GR in QFT when there's a chance that GR is incomplete?

GR explains most phenomena in our universe, but not everything.. Dark matter and Dark energy still don't fit in explanation of GR. QFT, on other hand, is almost complete. Shouldn't physicists go for ...
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1answer
142 views

Emergent physics in the gap between the Planck scale and the "size" of quarks [closed]

The smallest probed length scale to date is around $\Delta x \approx 10^{-18} m$ (see here). If we compare this to the Planck scale of $\Delta x \approx 10^{-35} m$ we are left with almost 20 orders ...
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2answers
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Is the universe finite and discrete?

Is the universe finite, both in the sense of being a closed spacetime manifold, as viewed from the macro level, but also in the sense of being fully discrete and finite in all of its intricate quantum ...
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1answer
325 views

String theory and one idea of "quantum structure of spacetime"

First of all, I do recognize that I haven't studied string theory up to this point. I'm actualy just getting started with it. So my question here is as follows: Einstein's theory of General ...
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1answer
63 views

Field theory if no fundamental space-time [closed]

If there is no fundamental space-time, is the field concept also doomed? If so, how can we derive unified field theory in a background space-time if there is no background space-time or worst, no ...
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0answers
54 views

Running of gravitational constant versus. other coupling constants, GUT and TOE

Is there any theory that proves convincingly that the gravitational constant runs with energy AND it is like the other coupling constants and converge at a single point at a given energy? Or is that a ...
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0answers
132 views

Could the graviton be more than one particle?

I guess this amounts to saying that gravity isn't a fundamental force and is, in fact, an emergent phenomenon (as in Erik Verlinde's theory). If gravity can be 'unified' with the other forces surely ...
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3answers
5k views

Are we closer to a theory of everything thanks to the detection of gravitational waves?

A couple of weeks ago I heard an astronomer explain that one of the latest detections of gravitational waves was accompanied by simultaneous detections of the same astronomical event in various other ...
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2answers
151 views

Is there a mathmatical theory to explain all physical phenomena? [duplicate]

Does anybody know of any physicists or mathematicians who have put forward a theory to everything, for which this mathematical theory would explain all physical phenomena in the universe in one ...
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0answers
42 views

Why is there isn't a Theory of everything after decades of research? [duplicate]

Why isnt there a theory of everything after decades of research by the best minds of the world. Is it because that general relativity and quantum mechanics are so different in their ideals