Quantum noise and large-scale cosmic microwave background anisotropy

Details Quantum noise and large-scale cosmic microwave background anisotropy Quantum noise and large-scale cosmic microwave background anisotropy

2006-04-13

arxiv.org/abs/astro-ph/0604292v3

JCAP 0702:006,2007

Astronomy and Astrophysics

Astrophysics

11 pages, revised version to appear in JCAP

Scientific paper

10.1088/1475-7516/2007/02/006

We propose a new source for the cosmological density perturbation which is passive fluctuations of the inflaton driven dynamically by a colored quantum noise as a result of its coupling to other massive quantum fields. The created fluctuations grow with time during inflation before horizon-crossing. However, the larger-scale modes cross out the horizon earlier, thus resulting in a suppression of their density perturbation as compared with those on small scales. By using current observed CMB data to constrain the parameters introudced, we find that a significant contribution from the noise-driven perturbation to the density perturbation is still allowed. It in turn gives rise to a suppression of the large-scale CMB anisotropy that may be relevant to the observed low quadrupole in the WMAP CMB anisotropy data. We also briefly discuss the implications to the energy scale of inflation and the spectral index and non-Gaussianity of the density perturbation.

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