Speaker:	Takahiro Nishimichi (IAP)
Title:	Non-perturbative properties of large-scale structure formation and their implications to cosmology
Date (JST):	Fri, Nov 28, 2014, 13:30 - 14:30
Place:	Seminar Room A
Related File:	1329.pdf
Abstract:	Precise modeling of the large-scale structure of the universe is a key for ongoing and upcoming observational projects to test cosmological models. I will review recent progress on analytical and numerical studies along this line. After showing the success and limitations of new analytical approaches based on renormalization of the perturbative series expansion, I discuss possible extensions to a non-perturbative level. I first discuss the kernel function for the nonlinear power spectrum that describes the mode coupling of the structure formation. I present the first simulation measurement of such a function and argue the compatibility/limitations of the perturbative predictions of this object. The result implies that the large-scale perturbations relevant to baryon acoustic oscillations are much less sensitive than the perturbative expectations to those on small scales where uncertainties in baryonic physics must be treated with care. I then introduce angular- averaged consistency relations between multi-point correlation functions with different numbers of points derived for scenarios starting from Gaussian initial conditions and evolved by gravity described by general relativity. The relation at the lowest order is extensively tested against N-body simulations in both real and redshift spaces.

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