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Red density perturbations and inflationary gravitational waves

Pagano, Luca and Cooray, Asantha and Melchiorri, Alessandro and Kamionkowski, Marc (2008) Red density perturbations and inflationary gravitational waves. Journal of Cosmology and Astroparticle Physics, 2008 (04). Art. No. 009. ISSN 1475-7516. http://resolver.caltech.edu/CaltechAUTHORS:PAGjcap08

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Abstract

We study the implications of recent indications from the Wilkinson Microwave Anisotropy Probe (WMAP) and other cosmological data for a red spectrum of primordial density perturbations for the detection of inflationary gravitational waves (IGWs) with forthcoming cosmic microwave background experiments. We consider a variety of single-field power-law, chaotic, spontaneous symmetry-breaking and Coleman–Weinberg inflationary potentials which are expected to provide a sizable tensor component and quantify the expected tensor-to-scalar ratio given existing constraints from WMAP on the tensor-to-scalar ratio and the power spectrum tilt. We discuss the ability of the near-future Planck satellite to detect the IGW background in the framework of those models. We find that the proposed satellite missions of the Cosmic Vision and Inflation Probe programs will be able to detect IGWs from all the models we have surveyed at better than 5σ confidence level. We also provide an example of what is required if the IGW background is to remain undetected even by these latter experiments.


Item Type:Article
Additional Information:Copyright © IOP Publishing Limited and SISSA 2008. Received 13 January 2008, accepted for publication 14 March 2008. Published 7 April 2008. We thank W Kinney for useful discussions and comments on an earlier draft. AC acknowledges support from NSF CAREER AST-0645427. MK acknowledges support from DoE DE-FG03-92-ER40701, NASA NNG05GF69G, and the Gordon and Betty Moore Foundation.
Group:TAPIR
Subject Keywords:CMBR experiments; CMBR detectors; CMBR polarization parameters; inflation
Record Number:CaltechAUTHORS:PAGjcap08
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:PAGjcap08
Alternative URL:http://dx.doi.org/10.1088/1475-7516/2008/04/009
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10094
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:11 Apr 2008
Last Modified:26 Dec 2012 09:56

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