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I was wondering if using the De Broglie equation $ lambda = frac{h}{p}$ for object traveling at really high speeds would result in a significant error. For example if...
Asked on 02/05/2021
2 answerIn this paper, it is mentioned that a non-centrosymmetric system with time-reversal symmetry doesn't have a linear response. It is actually a consequence of the Onsager reciprocal...
Asked on 02/05/2021
0 answerStudying the theory of open quantum systems, some textbooks start by introducing the notion of a semigroup for the time evolution operator $T_t$. The next step then usually is...
Asked on 02/05/2021 by Suppenkasper
1 answerI know that for an object with an applied force, the work done is $$W = Fd cos theta.$$ I was wondering what would happen when there is another...
Asked on 02/05/2021 by hi im nimdA
4 answerThe Polyakov action is given by$$S_{P} = -frac{T}{2} int d^2sigma sqrt{h} h^{mu nu} gamma_{mu nu}tag{1}$$ where $h_{mu nu}$ is the dynamical metric and $gamma_{mu...
Asked on 02/05/2021 by user273462
1 answerIf energy density relates to rest mass density as $epsilon = rho / c^2$. How internal energy relates to energy density?Also, when do we write $epsilon = rho /...
Asked on 02/05/2021 by umar khan
1 answerI am studying the lecture on general relativity for beginners here: https://youtu.be/foRPKAKZWx8?t=1998 I was able to follow the steps up until this point (33:18 in the video)....
Asked on 02/05/2021
2 answerIn this question we assume as usual that $hbar = c =1$, so the word "dimension" means the dimension in mass. From the fact that an action has the...
Asked on 02/05/2021
3 answerI am not sure if I am asking a metaphysical question but I really have a problem understanding the core of this concept of energy and its ability to drive...
Asked on 02/05/2021 by TLo
3 answerit seems to me that the definition of "nematic phase" is quite chamaleonic. Quoting from its first definition [Nature 393, 550 (1998)] for a 2-dimensional square lattice "The nematic phase...
Asked on 02/05/2021 by gryphys
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