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In thermofield dynamics, which constitutes an algebraic formulation of thermal quantum field theory, an entropy operator $hat{S}_beta$ for a single bosonic oscillator is introduced as $$hat{S}_beta=-k_B,(hat{a}^dagger hat{a},ln,sinh^2theta_beta-(hat{a}^dagger hat{a}...
Asked on 10/02/2021
0 answerI was recently trying to attempt this question which was on 2019 JEE Advanced Physics Paper 2.The question is as follows-...
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1 answerSuppose I used a polarized film to produce say left circularly polarized light, I wonder what happens to the rest of the light that gets absorbed or reflected away? Are...
Asked on 10/02/2021
1 answerBasically, the equivalence principle (EP) states that if someone is in a rocket in empty space with acceleration $g$ equal to that at the surface of the earth, any...
Asked on 10/01/2021
4 answerIf we know the universe is expanding in whatever direction we look, can't we reasonably estimate where the 'center' of the Universe is? Is the rate of expansions in all...
Asked on 10/01/2021 by Tom Gullen
4 answerA battery is connected to a 10Ω resistor as shown in Figure 2. The emf (electromotive force) of the battery is 6.0 V. When the switch...
Asked on 10/01/2021 by Wk_of_Angmar
2 answerFrom this paper, I want to integrate out the massive degrees of freedom. When we expand the action about a classical background, diagonalizing the mass matrix gives...
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0 answerI'm trying to follow Tong lectures about Gauge Theories, but I think I'm doing some really stupid mistake. At one point he takes the Hamiltonian for a spin $1/2$...
Asked on 10/01/2021 by Luca Martinoia
0 answerLooking at Bayer filter of a typical consumer camera, one can easily see that sensitivity of the filter for each...
Asked on 10/01/2021 by NoobPointerException
1 answerIt is predicted in string theory that our world has some extra dimensions. I'm wondering if we want to prove this experimentally, what should we do...
Asked on 10/01/2021
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