Questions tagged [unified-theories]
The unified-theories tag has no usage guidance.
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Why Dirac's spin-$\frac12$ theory proves wrong Kaluza-Klein theory?
I recently saw Sabine's short video that mentions that Dirac's spin-$\frac12$ theory proves wrong Kaluza-Klein theory unless supersymmetry is amended to the Kaluza-Klein.
Is there a more detailed ...
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Unification of Interactions
It has been asked before but with a different aim, and was answered mathematically, while I look for a practical understanding of it. If the Four Foundamental Forces were unified in the first instants ...
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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 ...
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QED impact on Unified Field Theory [closed]
how did the development of quantum electrodynamics impact the development of modern unified field theories?
and did any other theories have more significant impact?
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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 ...
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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:
$$E_8 \rightarrow E_6 \times SU(3).$$
...
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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 ...
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Was the Michelson & Morely experiment ever valid? [closed]
One of the key predecessors to Einstein's Relativity was another theory having to do with an "Aether" material. This substance was supposed to be the substrate that the universe is built ...
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Is there a "unification" explanation of why the mixed gauge-gravitational anomaly cancels in the standard model?
Quoting the Review of Particle Physics (93.2.3):
all representations of SO(10) are anomaly free in four dimensions... the absence of anomalies in ... a SM generation can be viewed as deriving from ...
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Is a QFT always an EFT coming from something deeper?
(I have already read this post but my question is different)
Reading Ch. 12 of Weinberg's Quantum Field Theory Vol. 1, he states that all realistic (interacting) QFTs are now believed to be EFT of ...
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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 ...
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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 ...
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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 ...
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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 ...
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Could the low Higgs mass be relevant to the unification of the (weak) nuclear force and gravity?
I found in a paragraph in a research paper (although it was talking about something else) the statement: that it is possible to unite the weak nuclear force and gravity, but that requires that:
Both ...
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