scholarly journals On the breaking of statistical isotropy through inflationary relics

2016 ◽  
Vol 31 (21) ◽  
pp. 1640004
Author(s):  
Juan C. Bueno Sánchez
Keyword(s):  
Scalar Field ◽  
Cosmic Microwave Background ◽  
Vector Fields ◽  
Equilibrium Configuration ◽  
Large Angle ◽  
Microwave Background ◽  
Curvature Perturbation ◽  
Statistical Isotropy

We explore a mechanism to generate local contributions to the curvature perturbation in isolated patches of the cosmic microwave background (CMB). The mechanism, based on the generation of an out-of-equilibrium configuration of a fluctuating scalar field of mass m [Formula: see text]H during a sustained stage of fast-roll inflation, has been recently shown to be capable of accounting for some of the most robust large-angle anomalies detected in the CMB. In this paper, we show in detail how the embedding of the mechanism into models including vector fields can result in the breaking of statistical isotropy in isolated patches of the CMB.

scholarly journals Scalar field dark energy and cosmic microwave background

2003 ◽  
Vol 124 ◽  
pp. 68-71 ◽  
Author(s):  
C. Baccigalupi ◽  
A. Balbi ◽  
S. Matarrese ◽  
F. Perrotta ◽  
N. Vittorio
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Cosmic Microwave Background ◽  
Microwave Background

scholarly journals Testing statistical isotropy in cosmic microwave background polarization maps

2018 ◽  
Vol 475 (4) ◽  
pp. 4357-4366 ◽  
Author(s):  
Pranati K Rath ◽  
Pramoda Kumar Samal ◽  
Srikanta Panda ◽  
Debesh D Mishra ◽  
Pavan K Aluri
Keyword(s):  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Cosmic Microwave Background Polarization ◽  
Statistical Isotropy

scholarly journals Searching for non-Gaussianity in the Planck data

2014 ◽  
Vol 10 (S306) ◽  
pp. 147-149
Author(s):  
Marcelo J. Rebouças ◽  
Armando Bernui
Keyword(s):  
Cosmic Microwave Background ◽  
Early Universe ◽  
Large Angle ◽  
Statistical Procedure ◽  
Statistical Properties ◽  
Microwave Background ◽  
Planck Data ◽  
Angle Deviation

AbstractThe statistical properties of the temperature anisotropies and polarization of the of cosmic microwave background (CMB) radiation offer a powerful probe of the physics of the early universe. In recent works a statistical procedure based upon the calculation of the kurtosis and skewness of the data in patches of CMB sky-sphere has been proposed and used to investigate the large-angle deviation from Gaussianity in WMAP maps. Here we briefly address the question as to how this analysis of Gaussianity is modified if the foreground-cleaned Planck maps are considered. We show that although the foreground-cleaned Planck maps present significant deviation from Gaussianity of different degrees when a less severe mask is used, they become consistent with Gaussianity, as detected by our indicators, when masked with the union mask U73.

scholarly journals Statistical isotropy of the cosmic microwave background

Pramana ◽  
2004 ◽  
Vol 62 (3) ◽  
pp. 793-796 ◽  
Author(s):  
Tarun Souradeep ◽  
Amir Hajian
Keyword(s):  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Statistical Isotropy

scholarly journals PROBING FOR DYNAMICS OF DARK-ENERGY IN MASS VARYING NEUTRINOS: COSMIC MICROWAVE BACKGROUND RADIATION AND LARGE SCALE STRUCTURE

2007 ◽  
Vol 22 (25n28) ◽  
pp. 2131-2142 ◽  
Author(s):  
YONG-YEON KEUM
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Cosmic Microwave Background ◽  
Large Scale ◽  
Background Radiation ◽  
Coupling Parameter ◽  
Cosmic Acceleration ◽  
Microwave Background ◽  
Cosmological Perturbation ◽  
Cosmological Perturbation Theory

We present cosmological perturbation theory in neutrino probe interacting dark-energy models, and calculate cosmic microwave background anisotropies and matter power spectrum. In these models, the evolution of the mass of neutrinos is determined by the quintessence scalar field, which is responsible for the cosmic acceleration today. We consider several types of scalar field potentials and put constraints on the coupling parameter between neutrinos and dark energy. Assuming the flatness of the universe, the constraint we can derive from the current observation is Σ mν < 0.87eV at the 95 % confidence level for the sum over three species of neutrinos.

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