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Dark matter does not interact with the electromagnetic force, however does interact with the gravitational force. Do we know if there are any big ‘clumps’ (like a star) of...
Asked on 08/02/2021
1 answerConsider a translation-invariant matrix product statebegin{equation}|psi_Lrangle= mathrm{Tr}[A(s_1)A(s_2)ldots A(s_L)]|s_1 s_2ldots s_Lrangle.end{equation}I'm interested in the expectation value of a local observable $hat{O}$~(say a...
Asked on 08/02/2021
1 answerIn the study of disordered conductors, the level number variance is defined as $$Sigma_2 (langle n rangle) equiv langle n^2 rangle-langle n rangle^2 ~, $$ where angular brackets denote...
Asked on 08/02/2021 by WLV
0 answerThe Lagrangian density for the $h=h^{00}$ term of the Einstein gravity tensor can be simplified to: $$L=-frac{1}{2}hBox h + (M_p)^ah^2Box h - (M_p)^b h T$$ The equations of...
Asked on 08/02/2021
1 answerWhat is the highest and lowest frequency EM wave detected? In theory, the maximum possible EM radiation must have a wavelength greater than Planck length. However, is there any maximum...
Asked on 08/02/2021
0 answerSay that I want to burn some fuel, so I'm aiming for a complete combustion, hence CO = 0 So I have 2 possibilities a) CO2 quantity = maximum, CO...
Asked on 08/02/2021
1 answerA car is moving with a constant velocity. If it hits a wall, will it apply force on the wall?My doubt is that if there is no acceleration, there...
Asked on 08/02/2021
5 answerWhen we talk about a particle taking an infinite amount of time for it to cross the event horizon in the external observer's point of view, we assume that the...
Asked on 08/02/2021
2 answerI'm faced with the following problem as stated in the image: Once I find the geometry part,...
Asked on 08/02/2021 by Rafa
1 answerAs far as I know, the critical angle exists only if light passes from a medium with a greater index of refraction to one with a smaller index of recreation....
Asked on 08/02/2021 by Maria Kintobor
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