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Title: Big Bang nucleosynthesis constraint on baryonic isocurvature perturbations

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [2];  [3];  [2]
  1. Univ. of Tokyo, Kashiwa, Chiba (Japan); UCLA
  2. Univ. of Tokyo, Kashiwa, Chiba (Japan)
  3. Univ. of Tokyo, Kashiwa, Chiba (Japan); Univ. of California, Los Angeles, CA (United States)

We study the effect of large baryonic isocurvature perturbations on the abundance of deuterium (D) synthesized in big bang nucleosynthesis (BBN). We found that large baryonic isocurvature perturbations existing at the BBN epoch (T ~ 0.1 MeV) change the D abundance by the second order effect, which, together with the recent precise D measurement, leads to a constraint on the amplitude of the power spectrum of the baryon isocurvature perturbations. The obtained constraint on the amplitude is pSE ≲ 0.016 (2σ) for scale k-1 ≳ 0.0025 pc. This gives the most stringent one for 0.1Mpc-1≲ k ≲ 4×108 Mpc-1. We apply the BBN constraint to the relaxation leptogenesis scenario, where large baryon isocurvature perturbations are produced in the last Nlast e-fold of inflation, and we obtain a constraint on Nlast.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
Japan Society for the Promotion of Science (JSPS); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
SC0009937
OSTI ID:
1608832
Journal Information:
Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 12 Vol. 2018; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Gravitational Lensing Signatures of Axion Dark Matter Minihalos in Highly Magnified Stars journal January 2020

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