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2019

Amending the halo model to satisfy cosmological conservation laws

Chen, Alice Y., Afshordi, Niayesh

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One of the most powerful tools in the arsenal of theoretical cosmologists is the halo model of large scale structure, which provides a phenomenological description of nonlinear structure in our universe.

However, it is well known that there is no simple way to impose conservation laws in the halo model.
This can severely impair the predictions on large scales for observables such as weak lensing or the kinematic Sunyaev-Zel'dovich effect, which should satisfy mass and momentum conservations, respectively.
For example, the standard halo model overpredicts weak lensing power spectrum by $> 8\%$ on scales $>20$ degrees.

Amending the halo model to satisfy cosmological conservation laws · Around

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