Tocay Alexie Leauthaud (UCSC) gave the NYU Astro Seminar, about various things related to cosmological tests with weak lensing. She showed an impressive result, which is that essentially all galaxy–galaxy lensing projects find a weak-lensing signal that is too low by tens of percent relative to what we expect from the Planck cosmological parameters and simple galaxy–halo occupation models. I am interested in looking into this more with Storey-Fisher and her (new, exploratory) models of galaxy occuption in hydro simulations. I have an intuition that the predictions might be overly naive if halo occupation is slightly more complex than expected. I am particularly interested in this issue because I think the galaxy–galaxy weak-lensing signal has been a very fundamental test of our picture of the dark sector.
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