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Cosmic microwave background power asymmetry from primordial sound speed parameter

Jul 15, 2013

5 pages

Published in:

Phys.Rev.D 89 (2014) 2, 023005

Published: Jan 16, 2014

e-Print:

1307.4090 [astro-ph.CO]

DOI:

10.1103/PhysRevD.89.023005

View in:

ADS Abstract Service

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Abstract: (APS)

The hemispherical power asymmetry in the cosmic microwave background can be explained by the modulation of some primordial cosmological parameters, such as the sound speed of the inflaton. Inspired by new physics beyond the standard knowledge of particle cosmology, this sound speed modulation greatly enriches the cosmological perturbation theory. We numerically examine the mechanism of the sound speed modulation and show it can be nicely consistent with current observations. Furthermore, this mechanism predicts that power asymmetry also exists in the temperature-polarization correlation and polarization autocorrelation of the cosmic microwave background with the same shape and in primordial non-Gaussianity of equilateral type with a particular shape. Therefore, our mechanism is observationally detectable in the forthcoming experiments.

Note:

5 page, 1 figure

98.70.Vc
98.65.Dx
98.80.Cq
98.80.Es
non-Gaussianity: primordial
modulation
asymmetry
perturbation theory
cosmological model: parameter space
cosmic background radiation: polarization

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