暴涨中粒子的生成对大尺度宇宙微波背景各向异性功率谱的影响

Influence of Particle Production during Inflation on CMB Anisotropic Power Spectrum at Large Scale

WMAP(Wilkinson Microwave Anisotropy Probe)观测得到的宇宙微波背景(CMB)角功率谱在大尺度上比广泛使用的ACDM宇宙模型给出的理论值有明显的压低.通过引入暴涨中粒子的生成过程,研究了大尺度上CMB各向异性功率谱的行为.计算表明,粒子的生成使得暴涨的原初功率谱产生了修正,从而影响了CMB的角功率谱,这样可以较为自然地得到四极矩附近的压低.

Based on the comparison between the WMAP （Wilkinson Microwave Anisotropy Probe） observational data and the theoretical results calculated by ACDM cosmological model, the anisotropic power spectrum of cosmic microwave background （CMB） at low multipoles is evidently suppressed. The effect of particle production is introduced to influence the behavior of CMB at large scale. It is shown that the primordial density fluctuation is revised due to the effect of particle production and the power spectrum of CMB is also changed correspondingly. Then a suppression is obtained naturally at the low multipoles, especially at the quadrupole. Such a picture based on the particle production during inflation may be a natural candidate to interpret the observational data.