CDM/baryon isocurvature perturbations in a sneutrino curvaton model

被引:6
|
作者
Harigaya, Keisuke [1 ]
Hayakawa, Taku [2 ]
Kawasaki, Masahiro [1 ,2 ]
Yokoyama, Shuichiro [2 ,3 ]
机构
[1] Univ Tokyo, TODIAS, Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan
[2] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan
[3] Rikkyo Univ, Dept Phys, Toshima Ku, Tokyo 2238521, Japan
关键词
particle physics - cosmology connection; supersymmetry and cosmology; leptogenesis; baryon asymmetry; INFLATIONARY UNIVERSE; COSMOLOGICAL BARYON; CHAOTIC INFLATION; CONSTRAINTS; FLATNESS; HORIZON; NUMBER;
D O I
10.1088/1475-7516/2014/10/068
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Matter isocurvature perturbations are strictly constrained from cosmic microwave background observations. We study a sneutrino curvaton model where both cold dark matter (CDM)/baryon isocurvature perturbations are generated. In our model, total matter isocurvature perturbations are reduced since the CDM/baryon isocurvature perturbations compensate for each other. We show that this model can not only avoid the stringent observational constraints but also suppress temperature anisotropies on large scales, which leads to improved agreement with observations.
引用
收藏
页数:17
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