Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-06-13
Astronomy and Astrophysics
Astrophysics
28 pages, 11 figures,accepted by IJMPD, Vol 17, No.7 (2008) 1005-1123
Scientific paper
10.1142/S0218271808012735
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 $\propto \Omega_m/\Omega_{\Lambda}\sim 0.4$ 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.
Er X. Z.
Miao Hai-Xing
Xia Tian-Yang
Zhang Yajing
Zhao Wenbing
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