Effects of Supersonic Relative Velocity Between Baryons and Dark Matter in the Early Universe

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Abstract/Contents

Abstract: Evolution of the Universe following cosmic recombination is typically modeled only in linear approximation. Tseliakhovich and Hirata (2010) showed that supersonic bulk relative velocity between cold dark matter and baryonic matter, coherent over scales of tens to hundreds of comoving Mpc, produces important nonlinear effects during this era. We present a new pseudo-spectral simulation code, which is uniquely able to model the nonlinear evolution of the matter density fields beginning at recombination. Using this code, we investigate the relative-velocity effect and quantify the suppression of structure formation on small scales. We demonstrate that the effect is present even by redshift z ~ 400. By z ~ 100, baryonic power has been suppressed by around 40% at scales of k = 80 h/Mpc, as compared with the standard linear theory.

Type of resource	text
Date created	2012

Author	Peairs, Gregory
Degree granting institution	Stanford University, Department of Physics
Primary advisor	Wechsler, Risa
Advisor	Abel, Tom

Location	https://purl.stanford.edu/vv654pm1204

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License: This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).

Preferred Citation: Peairs, Gregory (2012). Effects of supersonic relative velocity between baryons and dark matter in the early Universe. Stanford Digital Repository. Available at http://purl.stanford.edu/vv654pm1204.

Undergraduate Theses, Department of Physics

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