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Are there approaches to show that GR and QFT actually are unifable (without looking for a concrete ToE formalism)?

In mathematics, you can show that some problems are unprovable or have no solution at all and you also have the tool of proof by contradiciton, and similar. But is any of this also applied in physics ...
ldfjglfkgj's user avatar
3 votes
0 answers
50 views

The Role of the Kaehler Manifold in Supergravity

Actually, I already asked a similar question Coupling of supergravity to matter which has remained unanswered. So this time I will be less general. In the very interesting paper arXiv:2212.10044 [...
Frederic Thomas's user avatar
1 vote
0 answers
123 views

Question about $E_8$ symmetry breaking and hypercharge formula

Most $E_8$ gauge theories follow this breaking chain: $$E_8 \rightarrow E_6 \times SU(3)_{Gen}.$$ How does the $E_6 \times SU(3)$ group break down through $SO(10)$, the Pati-Salam Model or the Minimal ...
AdvilDuttay's user avatar
4 votes
0 answers
198 views

How does Garrett Lisi's $E_8$ Theory contain the Higgs Boson and Graviton?

How does Garrett Lisi's "Exceptionally Simple Theory of Everything" contain the Higgs Boson and Graviton? Let's say that $E_8$ breaks down like this: $$E_8 \rightarrow E_6 \times SU(3).$$ ...
AdvilDuttay's user avatar
7 votes
2 answers
1k views

New theory for unifying general relativity and quantum mechanics [closed]

The media is currently reporting on a new idea in theoretical physics, developed by the group of professor Jonathan Oppenheim, to unify general relativity with quantum theory. The novel idea is not to ...
M. Wind's user avatar
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5 votes
0 answers
294 views

Every possible QFT from positive geometry?

Physicist Nima Arkani-Hamed has taken an interesting approach to understand fundamental physics based on geometry (specifically, positive geometry constructions). This started with his work with ...
vengaq's user avatar
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1 answer
91 views

Particle acceleration - why are colliders seemingly so limited?

I imagine this has been asked before but I am wondering why particle accelerators are so limited. - Why do they have to be big circles? Is there no other technique of accelerating charged particles? ...
Rabbi Kaii's user avatar
3 votes
1 answer
237 views

What are the constraints on a quantum gravity theory? [duplicate]

My question is: what are the main constraints or challenges that prevent us from finding a consistent and complete theory of quantum gravity? Are they conceptual, mathematical, physical, or ...
Olandelie's user avatar
0 votes
1 answer
57 views

Limits to the complexity of a fundamental theory

There are examples in physics in which a simple law results from an immeasurably more complicated set of underlying interactions. Consider Hooke's law, for instance: there is a very simple equation ...
Marco Ocram's user avatar
  • 26.4k
-2 votes
1 answer
106 views

Is the quest for a theory unifying gravity and quantum mechanics just wishful thinking? [closed]

What is the basis of the believe that there should be a unified theory which simultaneously gives quantum physics (the regime small things moving very fast) and gravity (the regime of big things ...
dohmatob's user avatar
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1 vote
0 answers
86 views

Is the big bang (BB) correctly summarized as a sequence of symmetry-breaking events? [closed]

Please take this as a serious question from a curious yet deeply underinformed lover of this universe. This is more of a basic question concerning the overall mechanics of the transition stages from ...
blacktopshaman's user avatar
0 votes
1 answer
95 views

Could the fundamental symmetries of a fundamental theory of everything be explicitly broken, somehow?

If our universe was fundamentally described by a theory of everything (let's say e.g. string theory) it would have a set of fundamental symmetries (which would correspond to the fundamental symmetries ...
vengaq's user avatar
  • 2,464
1 vote
1 answer
106 views

Is String Theory actually the supreme theory of Physics that can unite the 'Theory of the Big' and the 'Theory of the Small'? [duplicate]

As Dr. Michio Kaku says, that in the current state of Physics, we have the 'Theory of the Big' that is black holes, the Big Bang, cosmology, astrophysics on one hand and the 'Theory of the Small' that ...
user avatar
2 votes
4 answers
149 views

What are the minimum requirements for a new fundamental theory?

If we knew a most-fundamental theory of physics, the many currently-known equations would be derived naturally from it. Perhaps, most of the unsolved problems in physics may be fully explained by the ...
SOQEH's user avatar
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-2 votes
2 answers
144 views

Are there non-Newton-based theories that explain the world at least as good? If not, why? [closed]

The history of physics basically goes like this: There was one clever guy, Newton, who did some amazing work explaining the motion of objects using mathematics. Over the time the experiments got ...
Foo Bar's user avatar
  • 398
4 votes
2 answers
192 views

What experiments could be done *in principle* to help down-select between different versions of string theory?

I understand that string theory (broadly defined) is a solution to quantum gravity. That is, it is a unified theory the explains both quantum phenomena (such as the particles of the standard model ...
Jagerber48's user avatar
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2 answers
77 views

What is the shortest form way to fully describe the way our universse functions? [closed]

Let's say we wanted to explain to some alien living in another universe with different laws of physics to how our universe worked, what is the shortest way of doing this? A different way of looking at ...
Jack's user avatar
  • 535
2 votes
1 answer
224 views

Implications of M-Theory on the correctness of String Theory

So we know that there are 5 types of string theories (Type 1, Type IIA, Type IIB, $SO(32)$ heterotic, and $E_8 \times E_8$ heterotic). It was shown that these 5 types are just limits of something ...
The Gypsy King's user avatar
-7 votes
1 answer
141 views

Is a unified theory encompassing all types of physics possible? [closed]

According to the cGh cube, a theory of everything should incorporate quantum mechanics, relativity and gravity. It should also include the other 3 forces to be unified to a single force. However, how ...
AdvilDuttay's user avatar
1 vote
0 answers
128 views

Mathematical prerequisites for M-theory [duplicate]

I am interested in learning M-theory; however I have no Idea as to what mathematics is required for it. Are the prerequisites the same as string theory? Is there more mathematical knowledge needed for ...
aygx's user avatar
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1 vote
0 answers
96 views

Can we calculate everything with an exact theory? [closed]

This question is not opinion based: If we have found the fundamental theory of how our universe works and we have no limitation for our Supercomputer: Could we then calculate everything/ every ...
nuemlouno's user avatar
  • 339
-1 votes
1 answer
56 views

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 ...
H. M's user avatar
  • 49
1 vote
2 answers
308 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 ...
Mason_dns's user avatar
1 vote
1 answer
83 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 ...
1 vote
1 answer
3k 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 ...
user avatar
-2 votes
2 answers
173 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 ...
Hank Igoe's user avatar
  • 343
5 votes
4 answers
381 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 ...
AlmostClueless's user avatar
0 votes
1 answer
115 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 ...
user avatar
2 votes
0 answers
107 views

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 ...
vengaq's user avatar
  • 2,464
0 votes
2 answers
64 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) ...
Josh's user avatar
  • 397
1 vote
2 answers
170 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 ...
Kawaljeet Kaur 's user avatar
2 votes
0 answers
40 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 ...
user avatar
3 votes
2 answers
883 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?
Vaibhav Pankhala's user avatar
7 votes
4 answers
2k 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 ...
Matko's user avatar
  • 285
-2 votes
1 answer
139 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 (...
Kugutsu-o's user avatar
  • 866
-1 votes
1 answer
131 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 ...
Sebastien Palcoux's user avatar
-5 votes
1 answer
173 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 ...
Larry's user avatar
  • 1
0 votes
4 answers
184 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 ...
Jay Douglass's user avatar
2 votes
0 answers
62 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 ...
Suvidh Jain's user avatar
0 votes
1 answer
158 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, ...
Ryder Rude's user avatar
  • 6,355
0 votes
0 answers
95 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 ...
asmani's user avatar
  • 520
-4 votes
1 answer
182 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 ...
potato's user avatar
  • 179
0 votes
1 answer
439 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 ...
hisairnessag3's user avatar
7 votes
1 answer
1k 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 ...
rickle_pickk's user avatar
2 votes
2 answers
276 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 ...
cuckoo's user avatar
  • 979
6 votes
3 answers
482 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 ...
OmG's user avatar
  • 639
2 votes
2 answers
1k 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 ...
Dhia Hassen's user avatar
0 votes
1 answer
572 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 ...
Alex L's user avatar
  • 1,145
3 votes
1 answer
1k 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 ...
OmG's user avatar
  • 639
0 votes
1 answer
733 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 ...
sagittarius_a's user avatar