Effects of a decaying cosmological fluctuation

被引：11

作者：

Amendola, L

Finelli, F

机构：

[1] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

[2] Ist Astrofis Spaziale & Fis Cosm, Sez Bologna, IASF, CNR,INAF, I-40129 Bologna, Italy

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.94.221303

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the initial conditions for a decaying cosmological perturbation and study its signatures in the cosmic microwave background anisotropies and matter power spectra. An adiabatic decaying mode in the presence of components that are not described as perfect fluids (such as collisionless matter) decays slower than in a perfect-fluid dominated Universe and displays super-Hubble oscillations. Wilkinson Microwave Anisotropy Probe first year data constrain the decaying to growing ratio of scale invariant adiabatic fluctuations at the matter-radiation equality to less than 10%.

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