Limits on semiclassical fluctuations in the primordial universe

We place limits on semiclassical fluctuations that might be present in the primordial perturbation spectrum. These can arise if some signatures of pre-inflationary features survive the expansion, or could be created by whatever mechanism ends inflation. We study two possible models for such remnant...

Full description

Saved in:
Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2013-02, Vol.2013 (2), p.1-15, Article 040
Main Authors: Aslanyan, Grigor, Manohar, Aneesh V, Yadav, Amit PS
Format: Article
Language:English
Subjects:
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Computer simulation
Cosmology
ENERGY SPECTRA
EXPANSION
Fluctuation
FLUCTUATIONS
Fourier analysis
Gaussian
Inflation
ISOTROPY
MARKOV PROCESS
MONTE CARLO METHOD
Perturbation methods
PERTURBATION THEORY
RELICT RADIATION
SEMICLASSICAL APPROXIMATION
SPACE
UNIVERSE
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We place limits on semiclassical fluctuations that might be present in the primordial perturbation spectrum. These can arise if some signatures of pre-inflationary features survive the expansion, or could be created by whatever mechanism ends inflation. We study two possible models for such remnant fluctuations, both of which break the isotropy of CMB on large scales. We first consider a semiclassical fluctuation in one Fourier mode of primordial perturbations. The second scenario we analyze is a semiclassical Gaussian bump somewhere in space. These models are tested with the seven-year WMAP data using a Markov Chain Monte Carlo Bayesian analysis, and we place limits on these fluctuations. The upper bound for the amplitude of a fluctuation in a single Fourier mode is a [< or =] 10 super(-4), while for the Gaussian bump a [< or =] 10 super(-3).
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2013/02/040