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In inner product spaces in $mathbb R$ we have an axiom stating that:$$ langle x, xrangle geq 0 text{and} langle x, xrangle...
Asked on 12/19/2020
2 answerIn Quantum Mechanics we mostly use linear operators which often represent a physical observable,In relativity we mostly work with tensors to describe how things change. But both objects are...
Asked on 12/19/2020 by Coderboy
3 answerI'm working through the proof of Wigner's theorem in Weinberg's The Quantum Theory of Fields Volume 1 Chapter 2 Appendix A pp. 91. Consider the following steps of the proof...
Asked on 12/18/2020
1 answerI read that bath scales measure body weight and not mass which means they measure m*g and not m.If I got a reading of 50 kg, does that mean that...
Asked on 12/18/2020
2 answerI have been studying metamaterials from "ELECTROMAGNETIC METAMATERIALS:TRANSMISSION LINE THEORY AND MICROWAVE APPLICATIONS" by Caloz and Itoh. They have commented that metals at optical frequencies have negative permittivity. My question...
Asked on 12/18/2020
0 answerSchwinger's quantum action principle states, that if you "vary the field Operators" $$hat{phi'}(x') = hat{phi}(x) + delta hat{phi}(x)$$ (which changes the Action Operator), then "the variation...
Asked on 12/18/2020
1 answerIn a power supply system, we know that we decrease the current and increase the potential difference. If we decrease the current by a factor of 10 and increase potential...
Asked on 12/18/2020 by Swapnil MZS
2 answerIn uniform circular motion, acceleration is $frac{v^2}{r}$ and time which it acts $rightarrow 0$. So $Delta v = 0$, but then why/how does direction change, when the...
Asked on 12/18/2020 by user23503
7 answerI have a question concerning the time ordering operator. Let's suppose we have a time evolution generated by some Hamiltonian $H(t)$ given by$$U(t)=T_leftarrowexpleft(-mathrm{i}int_0^tmathrm{d}s,H(s)right)tag{1}.$$In Breuer...
Asked on 12/18/2020 by randomdude
2 answerThis morning, in our little backyard, I heard an airplane that was flying above the clouds, which were completely and uniformly covering the blue sky, as if they formed one...
Asked on 12/18/2020
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