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I am reading Wick theorem from "Student Friendly Quantum Field Theory" By Robert D. Kaluber. I understand how normal orderd vanishes and only contraction remains. But in page no. 205,...
Asked on 12/05/2020 by Pro Academy
1 answerCan we use the work-energy theorem for a liquid in a container which is accelerated and where the liquid is static with respect to the container to find the pressure...
Asked on 12/05/2020 by Arun Bhardwaj
1 answerI am confused by rolling friction. Suppose you have a cylinder rolling which starts at rest at the top of an incline plane and begins to roll down the plane...
Asked on 12/05/2020
6 answerFor the time-dependent Hamiltonian $$H = frac{hat{P}^2}{2m} + frac{1}{2} momega^2hat{X}^2 + momega^2vthat{X} +vhat{P}$$ I would like to calculate the ground state, more precise, the stationary point up to a...
Asked on 12/05/2020 by gamma
1 answerSo I took the time to measure the current dependency on voltage of a diode I have. I applied an exponential fit to it, and have a pretty reliable equation...
Asked on 12/05/2020
1 answerI gather that for the landau free energy, $L = int d^{d}r (aphi^2 + bphi^4$) +... it makes sense to also include gradient terms like $(nabla phi)^2$, as...
Asked on 12/05/2020 by user12614190
0 answerI understand that there are differential equations that model the pendulum. I also know that, the period of the pendulum is given by 2π/ω. However, in the...
Asked on 12/05/2020 by FarmerZee
2 answerThe constitutive law for a Newtonian fluid is $$ boldsymbol{tau} = 2mu mathbf{D} + lambdaleft(nablacdotmathbf{v}right)mathbf{I}$$ where $mu$ is the dynamic viscosity. Assuming we have a flow field that has a...
Asked on 12/05/2020 by shk92
2 answerThis particular thought crossed my mind while deriving the expression for energy density of electric field in parallel plate capacitor. Energy density= $frac12 epsilon E^2$ It appears to me...
Asked on 12/05/2020
2 answerConsider the Lagrangian of $phi^4$ theory $$mathcal{L} = frac{1}{2}partial_muphi partial^muphi - frac{lambda}{4!}phi^4.$$ We define the following dilation transformation $$x^mu rightarrow e^alpha x^mu,phi(x) rightarrow...
Asked on 12/05/2020 by Bernoulli
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