Relaxation leptogenesis, isocurvature perturbations, and the cosmic infrared background

Masahiro Kawasaki, Alexander Kusenko, Lauren Pearce, and Louis Yang

Phys. Rev. D 95, 103006 – Published 8 May 2017

Abstract

Observations of cosmic infrared background (CIB) radiation exhibit significant fluctuations on small angular scales. A number of explanations have been put forth, but there is currently no consensus on the origin of these large fluctuations. We consider the possibility that small-scale fluctuations in matter-antimatter asymmetry could lead to variations in star formation rates which are responsible for the CIB fluctuations. We show that the recently proposed Higgs relaxation leptogenesis mechanism can produce such small-scale baryonic isocurvature perturbations which can explain the observed excess in the CIB fluctuations.

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Received 1 February 2017

DOI:https://doi.org/10.1103/PhysRevD.95.103006

Physics Subject Headings (PhySH)

Baryogenesis & leptogenesis Cosmology

Gravitation, Cosmology & AstrophysicsParticles & Fields

Authors & Affiliations

Masahiro Kawasaki^1,2, Alexander Kusenko^3,2, Lauren Pearce⁴, and Louis Yang³

¹Institute for Cosmic Ray Research, The University of Tokyo, Kashiwa, Chiba 277-8582, Japan
²Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8568, Japan
³Department of Physics and Astronomy, University of California, Los Angeles, California 90095-1547, USA
⁴William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 USA

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Vol. 95, Iss. 10 — 15 May 2017

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Physical Review D

covering particles, fields, gravitation, and cosmology