Right-handed sneutrinos as curvatons
Right-handed sneutrinos as curvatons
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作为曲子的右手中微子
DOI：
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发表时间：
2003
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影响因子：
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通讯作者：
J. McDonald
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文献类型：
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作者：
J. McDonald
我们考虑右手中微子可以作为导致宇宙学结构形成的能量密度扰动来源的可能性。研究了暴胀后因微扰暴胀衰变而重新加热的情况下，右手中微子相干振荡凝聚体的宇宙学演化。对于狄拉克中微子的情况，结果表明，为了使右手中微子有足够晚的衰变，有必要对普朗克尺度进行一些抑制，以抑制对右手中微子超势的修正。 cH2 对中微子质量平方项的修正也必须在暴胀期间受到抑制 (ucu&0.1)，在这种情况下，根据暴胀期间 ucu 的大小，可能会出现显着的蓝色 ~if c.0) 或红色 ~if c,0) 扰动谱。 R宇称也必须被打破，以确保宇宙不会被右旋中微子凝聚体晚期衰变（温度为1210 MeV）中最轻的超对称粒子所过度封闭。暴胀过程中产生的膨胀率可能明显小于传统的超对称暴胀模型~低至 106 GeV 是可能的！对于马约拉纳中微子的情况，需要对普朗克抑制的超势校正进行更严格的抑制。此外，马约拉纳中微子凝聚体在能够主导能量密度之前可能会被热化，这将排除马约拉纳右手中微子作为曲子。
We consider the possibility that a right-handed sneutrino can serve as the source of energy density perturbations leading to structure formation in cosmology. The cosmological evolution of a coherently oscillating condensate of right-handed sneutrinos is studied for the case where reheating after inflation is due to perturbative inflaton decays. For the case of Dirac neutrinos, it is shown that some suppression of Planck scalesuppressed corrections to the right-handed neutrino superpotential is necessary in order to have sufficiently late decay of the right-handed sneutrinos. cH2 corrections to the sneutrino mass squared term must also be suppressed during inflation (ucu&0.1), in which case, depending on the magnitude of ucu during inflation, a significantly blue ~if c.0) or red ~if c,0) perturbation spectrum is possible. R parity must also be broken in order to ensure that the Universe is not overclosed by the lightest supersymmetric particles from the late decay ~at temperatures 1210 MeV) of the right-handed sneutrino condensate. The resulting expansion rate during inflation can be significantly smaller than in conventional supersymmetric inflation models ~as low as 106 GeV is possible!. For the case of Majorana neutrinos, a more severe suppression of Planck-suppressed superpotential corrections is required. In addition, the Majorana sneutrino condensate is likely to be thermalized before it can dominate the energy density, which would exclude the Majorana right-handed sneutrino as a curvaton.