2008/06/30 by Y. ZHANG, Y. Zhang, W. ZHAO +7 · 1 citation
Computer Science · Physics and Astronomy · #Amplitude #Computational Physics and Python Applications #Cosmic microwave background #Cosmology and Gravitation Theories #Dark energy #Dark matter #Decoupling (probability) #Gravitational wave #Polarization (electrochemistry) #Pulsars and Gravitational Waves Research #Spectral line #astro-ph
paper · pdf · doi:10.1142/s0218271808012735
28 pages, 11 figures,accepted by IJMPD, Vol 17, No.7 (2008) 1005-1123
openalex publication_date 2008/07/01 · arxiv created 2008/07/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In this paper we briefly present our work on relic gravitational waves (RGW) and the CMB polarization in the accelerating universe. The spectrum of RGW has been obtained, showing the influence of 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 ∝ Ω m /Ω Λ ~ 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 using two half-Gaussian functions as an approximation to the visibility function during the photon decoupling, both the "electric" and "magnetic" spectra have been analytically derived and they are quite close to those obtained numerically. Several physical elements that affect the spectra have been examined, such as the decoupling process, inflation, dark energy, the baryons, etc.