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Let $X=xpartial_{t}+tpartial_{x}$ and $Y=ypartial_{t}+tpartial_{y}$ be Killing vectors on Minkowski $(-,+,+,+)$. It can be shown that $[X,Y]$ is also Killing. I get the following:begin{equation}[X,Y]=(x-y)partial_{t}+xpartial_{y}....
Asked on 12/23/2020 by M91
1 answerThis question is a result of me trying to understand how this universe can be possibly infinite if it isn't infinitely old. So to compare with an area that is...
Asked on 12/23/2020
2 answerThe way (and perhaps most students around the world) I was taught QM is very weird. There is no intuitive explanations or understanding. Instead we were given a recipe on...
Asked on 12/22/2020
6 answerThere are two cases when drawing FBD of a block resting on friction or frictionless surface.We draw at the back...
Asked on 12/22/2020 by user279337
2 answerThe following is taken from Cordes [1] on pulsar astronomy.The dispersive time delay [is]$$t_mathrm{DM}=frac{e^2}{2pi m_e c} frac {int_0^Dds text{ } n_e}{nu^2} = 4.15text{ms} text{ DM } nu_{text{GHz}}^{-2} tag{3}$$...
Asked on 12/22/2020
1 answerI'm a bit confused with how the foucault pendulum works. EDIT for clarity: The Foucault pendulum shows an effect which is commonly described as follows: the plane of oscillation of...
Asked on 12/22/2020 by Cromen
1 answerIf I understand it correctly, QFT assigns a field operator to every point in space. For a free scalar field:$$ hat{phi}(mathbf{x},t)=int frac{d^3p}{(2pi)^3} frac{1}{sqrt{2omega_{mathbf{p}}}} left[hat{a}_{mathbf{p}}exp(-iomega_{mathbf{p}}t+i{mathbf{p}}cdotmathbf{x}) + hat{a}_{mathbf{p}}^{dagger}exp(iomega_{mathbf{p}}t-i{mathbf{p}}cdotmathbf{x})right]...
Asked on 12/22/2020 by Dmitry Pugachev
0 answerI am having trouble understanding the Guided Fields derivation process. Firstly, We derive the Helmholtz equation easily:$Δ⋅vec{E}+ frac{∂^2vec{E}}{∂z^2} - gamma$0$⋅vec{E}= 0$Then we decompose the Helmholtz equation into two...
Asked on 12/22/2020 by javierhersan
0 answerIt's just a basic question I had when I was studying physics years back, So acceleration have two equations $$a=frac{F}{m}$$ and $$a=frac{text{d}v}{text{d}t}$$ So by the first equation, if...
Asked on 12/22/2020
2 answerWhy does the airflow at the leading edge of the wing curve toward the trailing edge of the wing?Is it because the leading edge of the wing generates high...
Asked on 12/22/2020
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