Gravitational modulated reheating and non-Gaussianity in supergravity R2 inflation

被引：16

作者：

Watanabe, Yuki ^{[1
]}

Yokoyama, Jun'ichi ^{[1
,2
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe RESCEU, Tokyo 1130033, Japan

[2] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778568, Japan

来源：

PHYSICAL REVIEW D | 2013年 / 87卷 / 10期

关键词：

GRAND UNIFIED THEORIES; MODEL HIGGS-BOSON; STANDARD MODEL; PHASE-TRANSITION; COSMOLOGY; UNIVERSE; GAUGE; BREAKING; FLATNESS; HORIZON;

D O I：

10.1103/PhysRevD.87.103524

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Reheating after R-2 inflation proceeds through gravitational particle production of conformally noninvariant fields. We argue that the nonvanishing expectation value of flat directions generic in supersymmetric theories break conformal invariance of the fields coupled to them in a position-dependent manner due to quantum fluctuations. As a result modulated reheating can occur after the supergravity R-2-inflation. The resultant curvature fluctuation is a mixture of the one produced during inflation and that produced by modulated reheating. The spectral index takes a value between n(s) = 0.960 and 0.983, the nonlinearity parameter of the local-type non-Gaussianity can be f(NL) similar to +/- 10, and the tensor-to-scalar ratio is r <= 4 x 10(-3.)

引用

页数：9

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