Big Bang nucleosynthesis constraint on baryonic isocurvature perturbations

被引：17
作者：
Inomata, Keisuke [1 ,2 ]
Kawasaki, Masahiro [1 ,2 ]
Kusenko, Alexander [2 ,3 ]
Yang, Louis [2 ]
机构：
[1] Univ Tokyo, ICRR, Kashiwa, Chiba 2778582, Japan
[2] Univ Tokyo, UTIAS, Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan
[3] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2018年 / 12期
关键词：
big bang nucleosynthesis; cosmological perturbation theory; baryon asymmetry; inflation; PRIMORDIAL NUCLEOSYNTHESIS; PHASE-TRANSITION; EARLY UNIVERSE; FLUCTUATIONS; BARYOGENESIS; GENERATION; DIFFUSION; ABUNDANCE; DYNAMICS;
D O I：
10.1088/1475-7516/2018/12/003
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the effect of large baryonic isocurvature perturbations on the abundance of deuterium (D) produced in big bang nucleosynthesis (BBN). Large baryonic isocurvature perturbations existing at the BBN epoch (T similar to 0.1 MeV) change the D abundance by a second order effect, which, together with the recent precise measurement of D abundance, leads to a constraint on the amplitude of the power spectrum of the baryonic isocurvature perturbations. We derive the upper limit on the amplitude P-SB less than or similar to 0.016 (2 sigma) for scales k(-1) greater than or similar to 0.0025 pc. This is the most stringent constraint for 0.1 Mpc(-1) less than or similar to k less than or similar to 4 x 10(8) Mpc(-1). We apply the BBN constraint to the relaxation leptogenesis scenario, where large baryonic isocurvature perturbations are produced in the last N-last e-fold of inflation, and we obtain a constraint on N-last.
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页数：14
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