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Consider the decay of a particle $X$ to two particles $c$ and $d$ in the rest frame of $X$.Using energy and momentum (4-vector) conservation, show...
Asked on 12/02/2021
2 answerSupposing a spaceship is moving in space in a straight line at very high speed, with a laser source on top of it flashing straight up (i.e. orthogonal to the...
Asked on 12/02/2021
1 answerI am reading this parer Majorana Corner Modes in a High-Temperature Platform,The Bogoliubov–deGennes Hamiltonian is : $hat{H}=sum_{k}Psi^dagger_kH(vec{k})Psi_k$with $Psi_k=(c_{a,kuparrow},c_{b,kuparrow},c_{a,kdownarrow},c_{b,kdownarrow},c_{a,-kuparrow}^dagger,c_{b,-kuparrow}^dagger,c_{a,-kdownarrow}^dagger,c_{b,-kdownarrow}^dagger)$and Hamiltonian is $H(vec{k})=M(vec{k})sigma_ztau_z+A_xsin(k_x)sigma_xs_z+A_ysin(k_y)sigma_ytau_z+Delta(vec{k})s_ytau_y-mutau_z$. All...
Asked on 11/30/2021
1 answerI'm a bit confused about what happens to frequency during the dispersion of white light passing through a prism. I understand that when a light wave is travelling in ...
Asked on 11/30/2021
1 answerI am currently looking at "Physical aspect of space-time torsion" by IL Shapiro. There in eq. 2.10, it mentions that in space-time with torsion the commutator of covariant derivatives acting...
Asked on 11/30/2021
2 answerIn solid state physics we might describe systems using second quantization and use the Bloch basis for the states of the quantum mechanical system. For example, to create an electron...
Asked on 11/30/2021
1 answerThe expression for the first-order Born approximation to the scattering amplitude goes like$$f(theta) propto int d^3 r e^{-i ( k - k_i)r} V(r)$$and so in...
Asked on 11/30/2021
2 answerAs seen in Section 4 of Chapter 5 of Costello, K. "Renormalization and Effective Field Theory", or in section 5.2 $L_infty$-Algebras of Classical Field Theories and...
Asked on 11/30/2021
1 answerIn the article I have been reading, we introduce the term "corrected diffusivity".Diffusion alone and the rest of the article is pretty much clear, but I can't quite grasp...
Asked on 11/30/2021
1 answerHow the relation $nabla_{a} u^{a}=D_{a} u^{a}-epsilon v^{i} nabla_{i} v_{j} u^{j}$ where $D_{a}$ is covariant derivate on the hypersurface between 4-divergence and 3-divergence of the vector on the hypersurface...
Asked on 11/30/2021 by Perturbed
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