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I am wondering about the spectrum of light that is often shown pictorially as a distribution of power, say, from sunlight. My question is: does this indicate that each...
Asked on 09/17/2020 by ZenPylon
3 answerIf you think about a pre-geometric theory of particles which might consist for example of only fermions, bosons and gravitons but no notion of space. Then the initial state and...
Asked on 09/17/2020 by zooby
0 answerI was reading this paper1, which says in Eqn(15) that the derivative of a unitary gate with respect to the parameter $mu$ can be decomposed into...
Asked on 09/17/2020 by sreeram
0 answerI'm trying to understand the logic underneath the concept of action and lagrangian. I know this kind of questions have been asked many times, but I was unable to find...
Asked on 09/16/2020
0 answerThe Unruh effect is a well-known example in which two Hamiltonians $H$ and $hat H$ associated with different timelike Killing vector fields both have a lower bound, in...
Asked on 09/16/2020 by Chiral Anomaly
3 answerThe equation of thermal stress is: Stress =$frac{F}{A}$ = -$E$ $a$ $dT$, where $E$ is Young's Modulus, $a$ is the coefficient of linear thermal expansion, and $dT$ is the change...
Asked on 09/16/2020
4 answerThis question of mine is regarding some general observation. From ray diagrams it can easily be concluded that using a real object, we cannot get a real image from a...
Asked on 09/16/2020 by Arnav Mahajan
2 answerLet's assume there exists a partition function $Z[J_i]$ for a theory of quantum gravity, with a family of sources $(J_i)_i$. Given the Palatini action in 3+1 dimensions:...
Asked on 09/16/2020 by Jeanbaptiste Roux
0 answerI was studying identical particles in Quantum Mechanics, when I came across the notion of the 'exchange operator' acting on a two-particle wavefunction, $psi_(x_1, x_2)$, in one dimension: ...
Asked on 09/16/2020
2 answerI'm stuck at the following exercise:Imagine an aluminum sphere that is painted matte white with an emissivity of $epsilon=0.10$ at visible wavelengths and $epsilon=0.95$...
Asked on 09/16/2020 by Keno
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