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arXiv 0806.2243astro-ph
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加速宇宙中的遗迹引力波和CMB极化

Relic Gravitational Waves And CMB Polarization In The Accelerating Universe

Y. Zhang, W. Zhao, T. Y. Xia, X. Z. Er, H. X. Miao

摘要:

本文简要介绍了我们对加速宇宙中残余引力波(RGW)和CMB偏振的研究。得到了RGW的光谱,表明了暗能量的影响。与非加速模型的谱相比,谱的形状基本相似,但在几乎整个频率范围内,RGW的振幅获得了物质与暗能量之比$\propto Ω_m/Ω_Λ\sim 0.4$的抑制因子.然后,RGW谱被用作源来计算CMB偏振谱。采用二分之一高斯函数作为光子退耦合过程中可见度函数的近似,解析地推导出了“电”谱和“磁”谱,它们与数值结果非常接近。对影响谱的几个物理因素,如退耦过程、暴胀、暗能量、重子等进行了考察。

英文摘要:

In this paper we briefly present our works on the relic gravitational waves (RGW) and the CMB polarization in the accelerating universe. The spectrum of RGW has been obtained, showing the influence of the dark energy. Compared with those from non-accelerating models, the shape of the spectrum is approximately similar, nevertheless, the amplitude of RGW now acquires a suppressing factor of the ratio of matter over dark energy $\propto Ω_m/Ω_Λ\sim 0.4$ over almost the whole range of frequencies. The RGW spectrum is then used as the source to calculate the spectra of CMB polarization. By a two half Gaussian function as an approximation to the visibility function during the photon decoupling, both the "electric" and "magnetic" spectra have been analytically derived, which are quite close to the numerical ones. Several physical elements that affect the spectra have been examined, such as the decoupling process, the inflation, the dark energy, the baryons, etc.

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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