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Title: Resurrecting power law inflation in the light of Planck results

Abstract

It is well known that a canonical scalar field with an exponential potential can drive power law inflation (PLI). However, the tensor-to-scalar ratio in such models turns out to be larger than the stringent limit set by recent Planck results. We propose a new model of power law inflation for which the scalar spectra index, the tensor-to-scalar ratio and the non-gaussianity parameter f{sub N{sub L}{sup equil}} are in excellent agreement with Planck results. Inflation, in this model, is driven by a non-canonical scalar field with an inverse power law potential. The Lagrangian for our model is structurally similar to that of a canonical scalar field and has a power law form for the kinetic term. A simple extension of our model resolves the graceful exit problem which usually afflicts models of power law inflation.

Authors:
 [1];  [2]
  1. School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016 (India)
  2. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007 (India)
Publication Date:
OSTI Identifier:
22369959
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; LAGRANGIAN FUNCTION; SCALAR FIELDS; SCALARS; SPECTRA; TENSORS; COSMOLOGICAL INFLATION

Citation Formats

Unnikrishnan, Sanil, and Sahni, Varun, E-mail: sanil@iisertvm.ac.in, E-mail: varun@iucaa.ernet.in. Resurrecting power law inflation in the light of Planck results. United States: N. p., 2013. Web. doi:10.1088/1475-7516/2013/10/063.
Unnikrishnan, Sanil, & Sahni, Varun, E-mail: sanil@iisertvm.ac.in, E-mail: varun@iucaa.ernet.in. Resurrecting power law inflation in the light of Planck results. United States. doi:10.1088/1475-7516/2013/10/063.
Unnikrishnan, Sanil, and Sahni, Varun, E-mail: sanil@iisertvm.ac.in, E-mail: varun@iucaa.ernet.in. Tue . "Resurrecting power law inflation in the light of Planck results". United States. doi:10.1088/1475-7516/2013/10/063.
@article{osti_22369959,
title = {Resurrecting power law inflation in the light of Planck results},
author = {Unnikrishnan, Sanil and Sahni, Varun, E-mail: sanil@iisertvm.ac.in, E-mail: varun@iucaa.ernet.in},
abstractNote = {It is well known that a canonical scalar field with an exponential potential can drive power law inflation (PLI). However, the tensor-to-scalar ratio in such models turns out to be larger than the stringent limit set by recent Planck results. We propose a new model of power law inflation for which the scalar spectra index, the tensor-to-scalar ratio and the non-gaussianity parameter f{sub N{sub L}{sup equil}} are in excellent agreement with Planck results. Inflation, in this model, is driven by a non-canonical scalar field with an inverse power law potential. The Lagrangian for our model is structurally similar to that of a canonical scalar field and has a power law form for the kinetic term. A simple extension of our model resolves the graceful exit problem which usually afflicts models of power law inflation.},
doi = {10.1088/1475-7516/2013/10/063},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 10,
volume = 2013,
place = {United States},
year = {Tue Oct 01 00:00:00 EDT 2013},
month = {Tue Oct 01 00:00:00 EDT 2013}
}