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If I write (my understanding of) how to derive the equations of motion from the Polyakov action, I come up missing a term. Beginning with the basic Polyakov action...
Asked on 02/09/2021
1 answerI was deducing the Palatini identity using the variation of the Christoffel symbols and got to the following result: $$ delta R_{munu}g^{munu}=(nabla^mu nabla^nu-g^{munu} square) delta g_{munu}$$ yet on this...
Asked on 02/09/2021
1 answerFor the coating, it is necessary to pour 40 ml of liquid in a closed container with a volume of 80 ml and place it in an oven at a...
Asked on 02/09/2021 by Mahdi Ahmadi
1 answerPlease I will like to know if a reasonable amount of heat can be generated upon the recombination of an electron-hole pair in a photo-excited semiconductor nanoparticle (such as TiO2,...
Asked on 02/08/2021 by lotanna
2 answerOn the book principle of lasers by O. Svelto, it is written that Gaussian beams are eigensolutions of the paraxial wave equation (written in integral form).I don't understand...
Asked on 02/08/2021
0 answerif I have A closed vessel that is half-filled with water. There is a hole near the top of the vessel and air is pumped out from this hole. will...
Asked on 02/08/2021 by Meet Lalwani
4 answerFor spontaneous magnetization $m$ in a sample of volume $V$, what do the limiting operations $$limlimits_{Vtoinfty}limlimits_{Bto 0}m(B,V)=0,limlimits_{Bto 0}limlimits_{Vtoinfty}m(B,V)neq 0$$ physically mean and why don't they...
Asked on 02/08/2021
1 answerI'm working through an introductory electrodynamics text (Griffiths), and I encountered a pair of questions asking me to show that:the divergence transforms as a scalar under rotationsthe gradient transforms as...
Asked on 02/08/2021 by nonagon
2 answerWe know that the heat supplied is directly proportional to the change in temperature. But during fusion and vaporization, the temperature is the same i.e $d T=0$. Is the...
Asked on 02/08/2021
1 answerI was solving the following problem:I made it but I got confused by something: I've obtained more solutions than I should....
Asked on 02/08/2021
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