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Given a wave functional of a scalar field in the momentum picture $Psi_t[phi]$ it can be evolved in time using: $$Psi_{t_2}[phi] = int K_{t_2-t_1}[phi,phi']Psi_{t_1}[phi']Dphi'$$ Where the evolution function...
Asked on 02/26/2021
0 answerI will briefly summarize what I know and then ask my questions. If you spot mistakes in my summary, please tell me. The idea of flavor symmetry is that massless...
Asked on 02/26/2021
2 answerI have a jet of compressed air that is impinging on a plastic disc. I know the pressure and temperature of the compressed air, and the pressure after being released...
Asked on 02/26/2021 by John Stockton
0 answerI really need some help on this problem, as I seem to be extremely close to the answer, but am only differing in one spot. Here is the problem: The...
Asked on 02/26/2021 by A R
1 answerI found this exercise from text book:Consider a $2 mathrm{D}$ vortex with complex potential$$W(z)=frac{i}{2 pi} ln (z-1)$$i) Compute the circulation around the loop...
Asked on 02/26/2021 by Maskoff
0 answerDoes there exist such thing, if it does, which charge distribution could generate it?If it doesn't exist, can it be proven?...
Asked on 02/26/2021 by Mind
0 answerLet suppose that I have a egg at $T=20ºC$ and I assume it's almost an sphere of radius $R$, let's call it surface $S$. I put the...
Asked on 02/26/2021 by user239504
1 answerIn Chapter 7.5 in Peskin and Schroeder, the authors define the physical charge in eq. (7.76),$$text{(physical charge)}=sqrt{Z_3}cdottext{(bare charge)}$$where $dfrac{1}{1-Pi(0)}equiv Z_3$. Here,$$Pi^{munu}(q)=(q^2g^{munu}-q^mu q^nu)Pi(q^2)$$$iPi^{munu}(q)$ being the sum of...
Asked on 02/26/2021
1 answerConsider a (free and massless) real scalar field $phi(x)$ with Hamiltonian$$H := int d^3mathbf{x}; bigg[ frac{1}{2} pi^2(mathbf{x}) + |nablaphi(mathbf{x})|^2 bigg]$$where $pi(mathbf{x})$ is the...
Asked on 02/26/2021
2 answerHow exactly does a humidity sensor work? For example, how can it differentiate between a relative humidity of 30 % and 35 %? ...
Asked on 02/26/2021
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