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Non-Gaussian Spikes from Chaotic Billiards in Inflation Preheating | | J. Richard Bond
; Andrei V. Frolov
; Zhiqi Huang
; Lev Kofman
; | | Date: |
20 Mar 2009 | | Abstract: | A new class of non-Gaussian curvature fluctuations zeta_{pr} (x) equiv
delta N(chi_i) arises from the post-inflation preheating behaviour of a
non-inflaton field chi_i. Its billiard-like chaotic dynamics imprints regular
log-spaced narrow spikes in the number of preheating e-folds N(chi_i). We
perform highly accurate lattice simulations of SUSY-inspired quartic inflaton
and coupling potentials in a separate-universe approximation to compute
N(chi_i) as a function of the (nearly homogeneous) initial condition chi_i.
The super-horizon modes of chi_i(x) result in positive spiky excursions in
zeta_{pr} and hence negative gravitational potential fluctuations added to the
usual sign-independent inflaton-induced perturbations, observably manifested in
large cosmic structures and as (polarized) temperature CMB cold spots. | | Source: | arXiv, 0903.3407 | | Services: | Forum | Review | PDF | Favorites | |
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