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arXiv 0908.1360astro-ph.COgr-qc
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大质量引力中张量模引起的CMB各向异性

CMB anisotropies induced by tensor modes in Massive Gravity

Dennis Bessada, Oswaldo D. Miranda

摘要:

我们研究引力波(GWs)的背景下,大规模引力,广义相对论(GR)的度量的波动有一个非零的质量,并专门调查张量模式的影响上的宇宙微波背景(CMB)各向异性。我们首先研究了大质量引力中张量模的时间演化,证明了存在引力子质量极限$m_l=10^{-66}g\sim 10^{-29}cm^{-1}$,使得对于质量$m\leq m_l$,大质量引力中的张量扰动与GR中相应的张量扰动是不可区分的,同时,我们还证明了短波长的大质量模与无质量模的行为几乎是不可区分的.随后,我们证明了质量在$m= 10^{-27}cm^{-1}$ - $m=10^{-26}cm^{-1}$范围内的大质量引力子会在CMB各向异性功率谱的低多极子($\ell< 30$)上留下清晰的信号。因此,我们的结果表明,CMB各向异性测量可能是决定性的,以显示是否张量模式是大规模或没有。

英文摘要:

We study Gravitational Waves (GWs) in the context of Massive Gravity, an extension to General Relativity (GR) where the fluctuations of the metric have a nonzero mass, and specifically investigate the effect of the tensor modes on the Cosmic Microwave Background (CMB) anisotropies. We first study the time evolution of the tensor modes in Massive Gravity and show that there is a graviton mass limit $m_l=10^{-66}g\sim 10^{-29}cm^{-1}$, so that for masses $m\leq m_l$ the tensor perturbations in Massive Gravity are indistinguishable from the corresponding ones in GR. Also, we show that short wavelength massive modes behave almost indistinguishably from their massless counterparts. Later on, we show that massive gravitons with masses within the range $m= 10^{-27}cm^{-1}$ - $m=10^{-26}cm^{-1}$ would leave a clear signature on the lower multipoles ($\ell< 30$) in the CMB anisotropy power spectrum. Hence, our results show that CMB anisotropies measurements might be decisive to show whether the tensor modes are massive or not.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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