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Hemispherical power asymmetry from scale-dependent modulated reheating

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Hemispherical power asymmetry from scale-dependent modulated reheating. / McDonald, John.
In: Journal of Cosmology and Astroparticle Physics, Vol. 2013, No. 11, 041, 19.11.2013.

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McDonald J. Hemispherical power asymmetry from scale-dependent modulated reheating. Journal of Cosmology and Astroparticle Physics. 2013 Nov 19;2013(11):041. doi: 10.1088/1475-7516/2013/11/041

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McDonald, John. / Hemispherical power asymmetry from scale-dependent modulated reheating. In: Journal of Cosmology and Astroparticle Physics. 2013 ; Vol. 2013, No. 11.

Bibtex

@article{1a8073ca95a4469a8d41b9171f1caedc,
title = "Hemispherical power asymmetry from scale-dependent modulated reheating",
abstract = "We propose a new model for the hemispherical power asymmetry of the CMB based on modulated reheating. Non-Gaussianity from modulated reheating can be small enough to satisfy the bound from Planck if the dominant modulation of the inflaton decay rate is linear in the modulating field sigma. sigma must then acquire a spatially-modulated power spectrum with a red scale-dependence. This can be achieved if the primordial perturbation of sigma is generated via tachyonic growth of a complex scalar field. Modulated reheating due to sigma then produces a spatially modulated and scale-dependent sub-dominant contribution to the adiabatic density perturbation. We show that it is possible to account for the observed asymmetry while remaining consistent with bounds from quasar number counts, non-Gaussianity and the CMB temperature quadupole. The model predicts that the adiabatic perturbation spectral index and its running will be modified by the modulated reheating component.",
keywords = "inflation, CMBR theory, WMAP DATA",
author = "John McDonald",
year = "2013",
month = nov,
day = "19",
doi = "10.1088/1475-7516/2013/11/041",
language = "English",
volume = "2013",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "11",

}

RIS

TY - JOUR

T1 - Hemispherical power asymmetry from scale-dependent modulated reheating

AU - McDonald, John

PY - 2013/11/19

Y1 - 2013/11/19

N2 - We propose a new model for the hemispherical power asymmetry of the CMB based on modulated reheating. Non-Gaussianity from modulated reheating can be small enough to satisfy the bound from Planck if the dominant modulation of the inflaton decay rate is linear in the modulating field sigma. sigma must then acquire a spatially-modulated power spectrum with a red scale-dependence. This can be achieved if the primordial perturbation of sigma is generated via tachyonic growth of a complex scalar field. Modulated reheating due to sigma then produces a spatially modulated and scale-dependent sub-dominant contribution to the adiabatic density perturbation. We show that it is possible to account for the observed asymmetry while remaining consistent with bounds from quasar number counts, non-Gaussianity and the CMB temperature quadupole. The model predicts that the adiabatic perturbation spectral index and its running will be modified by the modulated reheating component.

AB - We propose a new model for the hemispherical power asymmetry of the CMB based on modulated reheating. Non-Gaussianity from modulated reheating can be small enough to satisfy the bound from Planck if the dominant modulation of the inflaton decay rate is linear in the modulating field sigma. sigma must then acquire a spatially-modulated power spectrum with a red scale-dependence. This can be achieved if the primordial perturbation of sigma is generated via tachyonic growth of a complex scalar field. Modulated reheating due to sigma then produces a spatially modulated and scale-dependent sub-dominant contribution to the adiabatic density perturbation. We show that it is possible to account for the observed asymmetry while remaining consistent with bounds from quasar number counts, non-Gaussianity and the CMB temperature quadupole. The model predicts that the adiabatic perturbation spectral index and its running will be modified by the modulated reheating component.

KW - inflation

KW - CMBR theory

KW - WMAP DATA

U2 - 10.1088/1475-7516/2013/11/041

DO - 10.1088/1475-7516/2013/11/041

M3 - Journal article

VL - 2013

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 11

M1 - 041

ER -