Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· arXiv e-print (arXiv:astro-ph/0503360)
· References in the article
· Citations to the Article (30) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
The Lyth bound revisited
Authors:
Efstathiou, George; Mack, Katherine J.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK), AB(Department of Astrophysical Sciences, Princeton University, Peyton Hall-Ivy Lane, Princeton, NJ 08544, USA)
Publication:
Journal of Cosmology and Astroparticle Physics, Issue 05, pp. 008 (2005). (JCAP Homepage)
Publication Date:
05/2005
Origin:
IOP
DOI:
10.1088/1475-7516/2005/05/008
Bibliographic Code:
2005JCAP...05..008E

Abstract

We investigate the Lyth bound relating the tensor scalar ratio, r, to the variation of the inflaton field, Δphi, over the course of inflation. For inflationary models that produce at least 55 e-folds of inflation, there is a correlation between r and Δphi as anticipated by Lyth, but the scatter around the relationship is huge. However, for inflationary models that satisfy current observational constraints on the scalar spectral index and its first derivative, the Lyth relationship is much tighter. In particular, we find that inflationary models with r \gtrsim 10^{-3} must have \Delta \phi \gtrsim m_{\mathrm {pl}} , unless the parameters of the models are finely tuned. Large field variations are generally required if a tensor mode signal is to be detected in any foreseeable cosmic microwave background (CMB) polarization experiment.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints