I am trying to undersand Ashcroft's derivation of energy density on page 38. I am following most of the arguments save EQ 2.30. Where did the vector go? I did follow my professors argument for converting to polar/spherical when the argument of a function is a modulus of a vector — exploiting symmetry to make a nice easy integral. However, it is a whole other matter two have an actual vector in the integrand. I would expect it to be dotted into something in order to have it equal a scalar (other than zero). I am scratching my head here. The steps leading up to this are a little long, so I am just leaving it as a reference and hoping you guys have access to this textbook.(adsbygoogle = window.adsbygoogle || []).push({});

Thanks,

Chris

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# Solid State Question: A Confusing Integral in Ashcroft

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