Dark radiation in LARGE volume models

被引：148

作者：

Cicoli, Michele ^{[1
,2
]}

Conlon, Joseph P. ^{[3
]}

Quevedo, Fernando ^{[1
,4
]}

机构：

[1] Abdus Salaam Int Ctr Theoret Phys, I-34014 Trieste, Italy

[2] INFN, Sez Trieste, I-34151 Trieste, Italy

[3] Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England

[4] DAMTP, Ctr Math Sci, Cambridge CB3 0WA, England

来源：

PHYSICAL REVIEW D | 2013年 / 87卷 / 04期

关键词：

COSMOLOGICAL IMPLICATIONS;

D O I：

10.1103/PhysRevD.87.043520

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider reheating driven by volume modulus decays in the LARGE volume scenario. Such reheating always generates nonzero dark radiation through the decays to the axion partner, while the only competitive visible sector decays are Higgs pairs via the Giudice-Masiero term. In the framework of sequestered models where the cosmological moduli problem is absent, the simplest model with a shift-symmetric Higgs sector generates 1.56 <= Delta N-eff <= 1.74. For more general cases, the known experimental bounds on Delta N-eff strongly constrain the parameters and matter content of the models. DOI: 10.1103/PhysRevD.87.043520

引用

页数：6

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