Constraints on gravitino decay and the scale of inflation using CMB spectral distortions
Constraints on gravitino decay and the scale of inflation using CMB spectral distortions
复制标题
使用 CMB 光谱畸变对引力衰变和暴胀规模进行约束
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Chluba
中科院分区：
文献类型：
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作者：
E. Dimastrogiovanni;L. Krauss;J. Chluba
如果局部超对称是粒子物理学标准模型的正确扩展，那么在暴胀之后的早期宇宙中应该充满了重加热过程中热等离子体散射产生的引力子。它们的丰度与再加热温度的大小直接相关。引力子的寿命是固定的，是其质量的函数，对于寿命超过宇宙年龄的引力子，在红移$zsimeq 2乘以10^{6}$（或大约$6乘以10^6{
m s}$），衰变产物会产生宇宙微波背景的光谱扭曲。目前COBE/FIRAS对光谱失真的限制，在某些情况下，已经可以与一些引力子衰变场景中原始核合成的宇宙学限制相竞争。我们展示了当前技术如何达到对mu和y扭曲的灵敏度限制，这将改善约束条件，并可能排除引力子质量和暴胀再加热温度的很大一部分参数空间。
If local supersymmetry is the correct extension of the standard model of particle physics, then following Inflation the early universe would have been populated by gravitinos produced from scatterings in the hot plasma during reheating. Their abundance is directly related to the magnitude of the reheating temperature. The gravitino lifetime is fixed as a function of its mass, and for gravitinos with lifetimes longer than the age of the universe at redshift $zsimeq 2 imes 10^{6}$ (or roughly $6 imes 10^6{
m s}$), decay products can produce spectral distortion of the cosmic microwave background. Currently available COBE/FIRAS limits on spectral distortion can, in certain cases, already be competitive with respect to cosmological constraints from primordial nucleosynthesis for some gravitino decay scenarios. We show how the sensitivity limits on $mu$ and $y$ distortions that can be reached with current technology would improve constraints and possibly rule out a significant portion of the parameter space for gravitino masses and Inflation reheating temperatures.