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Given the action$$ A = int_{M} d^{4}x mathcal{L}(phi, nabla phi) $$where $mathcal{L}$ is a lagrangian density, or if you prefer $mathcal{L} = sqrt{-g} mathcal{tilde{L}}$...
Asked on 07/13/2021
1 answerI am currently studying the textbook The Quantum Theory of Light, third edition, by R. Loudon. In the introduction, the author says the following:In the customary photon description of quantum-optical...
Asked on 07/13/2021
6 answerSo I am a benevolent genius that figured out that if only I had a kilo of neutrinos in a bottle, I could solve some long standing problems (climate change,...
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2 answerIn terms of generating superpositions, what have we observed in terms of gravitational effects, or what do we expect to observe (considering how we don't have a quantum theory of...
Asked on 07/13/2021
1 answerTo come with the theory of an accelerating expansion of the universe scientist compared the redshift of galaxies at different distance and noticed that closer the distant galaxy was faster...
Asked on 07/13/2021 by agone07
0 answerQuestionSo I recently pondered the following. Let's say I have an $2$ actions $S_1$ and $S_2$ which differ by a constant: $$ S_1(dot x_i, x_i) =...
Asked on 07/13/2021
1 answerWhile it is quite common to use piecewise constant functions to describe reality, e.g. the optical properties of a layered system, or the Fermi–Dirac statistics at (the impossible to...
Asked on 07/13/2021 by Tobias Kienzler
5 answerWikipedia says about the equations of motion that;"If the dynamics of a system is known, the equations are the solutions for the differential equations describing the motion of the dynamics."And"A...
Asked on 07/13/2021
2 answerSuppose that we have an atom $A$ in an excited state. This atom has a probability of emitting a photon $gamma$. If we are in a finite space...
Asked on 07/13/2021
0 answerThe expression for $mathcal{N}=4$ SYM in the Lorentz covariant form involves structure constants of $SU(4)$ R-symmetry group in the Yukawa terms (formula 3.1 from here ...
Asked on 07/13/2021
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