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arXiv 1004.2944gr-qcastro-ph.CO
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LIGO S5对残余引力波谱指数的约束

Constraints upon the spectral indices of relic gravitational waves by LIGO S5

Y. Zhang, M. L. Tong, Z. W. Fu

摘要:

随着LIGO达到了设计灵敏度,LIGO S5应变数据可用,对遗迹引力波(RGW)的约束变得现实。在暴胀过程中产生的RGW的分析光谱敏感地依赖于初始条件,这是一般描述的指数$β$,运行指数$α_t$,和张量标量比$r$。通过两个探测器互相关的LIGO S5数据,得到了对参数$(β, α_t,r)$的约束条件。作为主要结果,我们使用给定LIGO探测器对的互相关,计算了不同$(β, α_t, r)$值下RGW的理论信噪比(SNR)。得到了BBN和CMB对RGW能量密度的间接约束,比LIGO S5更严格。

英文摘要:

With LIGO having achieved its design sensitivity and the LIGO S5 strain data being available, constraints on the relic gravitational waves (RGWs) becomes realistic. The analytical spectrum of RGWs generated during inflation depends sensitively on the initial condition, which is generically described by the index $β$, the running index $α_t$, and the tensor-to-scalar ratio $r$. By the LIGO S5 data of the cross-correlated two detectors, we obtain constraints on the parameters $(β, α_t,r)$. As a main result, we have computed the theoretical signal-to noise ratio (SNR) of RGWs for various values of $(β, α_t, r)$, using the cross-correlation for the given pair of LIGO detectors. The constraints by the indirect bound on the energy density of RGWs by BBN and CMB have been obtained, which turn out to be still more stringent than LIGO S5.

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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