Gravitational Baryogenesis after Anisotropic Inflation
Gravitational Baryogenesis after Anisotropic Inflation
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各向异性暴胀后的引力重子生成
DOI：
10.1103/physrevd.93.103513
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Kei-ichi Maeda
中科院分区：
文献类型：
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作者：
Mitsuhiro Fukushima;Shuntaro Mizuno;Kei-ichi Maeda
当我们考虑引力子问题时，引力重子生成在宇宙的标准热历史中可能不会产生足够的重子不对称性。因此，有人认为宇宙的各向异性可以通过增加Ricci标量曲率的时间变化来增强重子不对称性的产生。研究了各向异性暴胀结束时产生的各向异性引力重子生成。虽然我们证实了所产生的重子不对称性比原来的各向同性宇宙学模型得到了增强，但考虑到最近CMB观测对各向异性的约束，我们发现仅仅通过引力重子生成而不受引力子问题的影响仍然很难得到所观测到的重子不对称性.
The gravitational baryogensis may not generate a sufficient baryon asymmetry in the standard thermal history of the Universe when we take into account the gravitino problem. Hence, it has been suggested that anisotropy of the Universe can enhance the generation of the baryon asymmetry through the increase of the time change of the Ricci scalar curvature. We study the gravitational baryogenesis in the presence of anisotropy, which is produced at the end of an anisotropic inflation. Although we confirm that the generated baryon asymmetry is enhanced compared with the original isotropic cosmological model, taking into account the constraint on the anisotropy by the recent CMB observations, we find that it is still difficult to obtain the observed baryon asymmetry only through the gravitational baryogenesis without suffering from the gravitino problem.