Find answers to your questions about Physics or help others by answering their Physics questions.
In Quantum Mechanics, the Heisenberg evolution of an observable $hat{o}$ is defined as $$ hat{o}(t) = U(t,0)^{dagger} hat{o} U(t,0) $$ where $U(t,0)$ is the unitary time-evolution operator...
Asked on 08/26/2021
1 answerConsider the following protocol:Alice and Bob share the statebegin{equation} |Phi^+rangle=frac{1}{sqrt{2}}(|0rangle|0rangle pm |1rangle|1rangle) end{equation}Alice has to teleport to Bob the state (which can be unknown even to her)...
Asked on 08/26/2021
1 answerI'm currently fiddling around with gauge-phase-transformations in Fock space.Especially, I'm trying to write a local gauge-phase-transformation asan operator in a basis-independent way. Here is what I have so...
Asked on 08/25/2021 by Thomas Fritsch
1 answerWhy do the red points in the following figure have the same pressure?...
Asked on 08/25/2021
1 answerIn the first volume of Polchinski page 39 we can read a compact formula to perform normal-order for bosonic fields$$:cal F:~=~underbrace{expleft{frac{α'}{4}∫mathrm{d}^2zmathrm{d}^2wlog|z-w|^2frac{δ}{δφ(z,bar z)}frac{δ}{δφ(w,bar zw)} right}}_{:=mathcal{O}}cal F, tag{1}$$...
Asked on 08/25/2021 by MaPo
2 answerThis is more of a conceptual question. Normally a conservation law will look something like $$frac{partial j}{partial t}+frac{partial F}{partial x}=0tag{1}$$ where $x$ is typically a real-valued coordinate, or...
Asked on 08/25/2021 by user41208
1 answerWe know gapless Goldstone mode appears when the system exhibits spontaneously symmetry broken. Does this means whenever we observe gapless acoustic modes it is Goldstone mode i.e. spontaneous symmetry broken?...
Asked on 08/25/2021
1 answerCould someone describe the difference, qualitatively, between QFT in curved spacetime, semiclassical gravity, and quantum gravity? I know that each is an approximation to the next and the end goal...
Asked on 08/25/2021 by user203234
1 answerIn the concluding section of this post user Chiral Anomaly states following:On the other hand, since any stable marriage of quantum theory and gravity (in the sense of general...
Asked on 08/25/2021
1 answerI know that, for example we have $$frac{delta g^{jk}}{delta g^{lm}}=delta^{j}_{(l}delta^{k}_{m)}.$$This topic was discussed previously e.g. on Physicsforums.com and on Phys.SE. So I was wondering,...
Asked on 08/25/2021 by Alabarda 980
0 answerGet help from others!
Recent Answers
Recent Questions
© 2024 TransWikia.com. All rights reserved. Sites we Love: PCI Database, UKBizDB, Menu Kuliner, Sharing RPP