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  1. G

    Momentum space measure -- change of variables

    I'm working through an article called "Cosmic abundances of stable particles -- improved analysis" (link -- viewable only in Firefox afaik), the result of which, equation (3.8), is cited quite a lot. I'm more interested in how they arrived there. Particularly, how come momentum space measure...
  2. G

    What is this ecuation about?

    Looks like the geodesic equation. Einstein summation convention is used in the Wikipedia article.
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