Dark Radiation from Modulated Reheating

Details Dark Radiation from Modulated Reheating Dark Radiation from Modulated Reheating

2011-11-05

arxiv.org/abs/1111.1336v3

JCAP03(2012)036

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages; v2: added references and Appendix B; v3: published in JCAP

Scientific paper

10.1088/1475-7516/2012/03/036

We show that the modulated reheating mechanism can naturally account for dark radiation, whose existence is hinted by recent observations of the cosmic microwave background radiation and the primordial Helium abundance. In this mechanism, the inflaton decay rate depends on a light modulus which acquires almost scale-invariant quantum fluctuations during inflation. We find that the light modulus is generically produced by the inflaton decay and therefore a prime candidate for the dark radiation. Interestingly, an almost scale-invariant power spectrum predicted in the modulated reheating mechanism gives a better fit to the observation in the presence of the extra radiation. We discuss the production mechanism of the light modulus in detail taking account of its associated isocurvature fluctuations. We also consider a case where the modulus becomes the dominant component of dark matter.

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