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Non-Gaussian Spikes from Chaotic Billiards in Inflation Preheating

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arxiv 0903.3407 v1 pith:FBC4ZWHR submitted 2009-03-20 astro-ph.CO gr-qchep-phhep-th

J. Richard Bond (CITA) , Andrei V. Frolov (SFU) , Zhiqi Huang (UofT) , Lev Kofman (CITA) This is my paper · ORCID
classification astro-ph.COgr-qchep-phhep-th
keywords preheatingchaoticfluctuationsnon-gaussianspikeszetaaccurateadded
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A new class of non-Gaussian curvature fluctuations \zeta_{pr} (\bx) \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(\bx) 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.

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Cited by 4 Pith papers

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