All Questions
Tagged with quantum-field-theory general-relativity
292
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What defines the gauge group for pure gravity?
Asymptotic symmetry of space-time corresponds to diffeomorphism transformation of physical space-time, which manifests as isometry near Conformal Boundary. Asymptotic symmetry can be defined using ...
- 1,752
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What's the hair of the blackhole?
Quote:
The no-hair theorem states that all stationary black hole solutions of the Einstein–Maxwell equations of gravitation and electromagnetism in general relativity can be completely characterized ...
- 3,256
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How do I self-study physics at the undergrad level? [closed]
I'm a new physics undergrad worried that I won't be able to learn everything I want at the university I'm going to.
Basically the Institute I'm going to is applied sciences focused, and all electives ...
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1
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Second Law of Thermodynamics and Particle Creation/Annihilation
I have a question regarding the second law of thermodynamics:
In most proofs of the second law of thermodynamics (like Jaynes' proof) the phase space is considered to be of constant dimension.
However ...
- 1,488
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Path integral of Quantum Gravity while keeping Einstein's relation satisfied
Suppose we have a field $\phi(x)$ and the metric field is $g_{\mu \nu}(x)$. The action is the functional $S[\phi (x) , g_{\mu \nu } (x)] $. We want to do the path integral:
$$\int d[\phi (x)] d[g_{\mu ...
- 6,355
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What's the importance of all four fundamental forces being "curvature"?
I've heard about how, in a gauge theory, the gauge covariant derivative of the field around a closed curve is generally not zero, and this is how you can quantify force or field strength. And that ...
- 2,475
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316
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In which order should I start learning theoretical physics on my own? [closed]
I m very eager to start learning further physics but stuck at where to start!! I have a very good understanding upto +2 level and now I wish to go even further but dont know how or in which sequence I ...
3
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3
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Why should dark matter and dark energy inherently require theoretical modification?
What we know more or less directly about both dark matter and dark energy is their spacetime curvature, and attempts to detect corresponding particles have thus far come up short as far as I've read. ...
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Non-minimally coupled inflation
In Wikipedia you can read under the Keyword Inflaton , the Formula:
What do the individual formula symbols mean in the following formula:
$$S=\int d^{4}x \sqrt{-g} \left[\frac{1}{2}m^2_{P}R-\frac{1}{2}...
- 11
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How to use GR instead of QFT (or vice versa), if possible at all, in the sense that we can use SR instead of CM even for low-speed cases? [closed]
I asked a question on the philosophy SE - here. However, I realized this question is better suited in a Physics SE but I would rephrase it and explain my question very precisely. First, I'll mention ...
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Some resources on quantising spin 2 fields in flat and curved space time
I want to understand how one can quantize spin 2 fields. Any resource which starts with a flat background before moving on to curved backgrounds would be great. So far, I have found this article but I ...
6
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Interacting QFT construction on curved spacetime
As far as I can tell, most of the concrete models considered in (rigorous) QFT on curved spacetime are either free or perturbative. In fact the only construction of an interacting QFT on curved ...
- 233
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55
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Brief electron-positron pair creation annihilation and light deflection by gravity
According to QFT there exists a non-vanishing probability amplitude for the following process:
a photon very briefly turns into an electron-positron pair
which then annihilate each other almost ...
- 151
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On the range of validity of General Relativity and Quantum Field Theory in terms of energy and impact parameter (from Rovelli & Vidotto's book)
In Fig. 1.1 on page 5 in Rovelli & Vidotto's 2015 book Covariant Loop Quantum Gravity: An Elementary Introduction to Quantum Gravity and Spinfoam Theory (PDF), there is this graph giving a general ...
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Are there examples of harmonic differential forms in non-singular projective algebraic varieties that appear in general relativity or quantum physics?
I would like to study some real physical examples of harmonic differential forms in non-singular projective algebraic varieties. As Calabi - Yau and Kahler manifolds are used in supersymmetry theories ...
