I'm trying to interpret the expression of a microcanonical distribution for energy [itex]E_0[/itex] of a particle of mass m moving about a fixed centre to which it is attracted by a Coulomb potential, [itex]Zr^{-1}[/itex], where [itex]Z[/itex] is negative. The function expression looks like this:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]ρ_{E_0}(\textbf{r,p}) = \delta(E_0 - \frac{1}{2}m^{-1}p^2-Zr^{-1})[/itex].

Most of the stuff in the expression is understandable, but I am not sure what the delta signifies here. Any help?

Thanks!

J

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# Interpreting microcanonical distribution

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