Dulaney, Timothy R. and Gresham, Moira I. (2010) Primordial power spectra from anisotropic inflation. Physical Review D, 81 (10). Art. No. 103532. ISSN 0556-2821 http://resolver.caltech.edu/CaltechAUTHORS:20100625-082435140
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We examine cosmological perturbations in a dynamical theory of inflation in which an Abelian gauge field couples directly to the inflaton, breaking conformal invariance. When the coupling between the gauge field and the inflaton takes a specific form, inflation becomes anisotropic and anisotropy can persist throughout inflation, avoiding Wald’s no-hair theorem. After discussing scenarios in which anisotropy can persist during inflation, we calculate the dominant effects of a small persistent anisotropy on the primordial gravitational wave and curvature perturbation power spectra using the “in-in” formalism of perturbation theory. We find that the primordial power spectra of cosmological perturbations gain significant direction dependence and that the fractional direction dependence of the tensor power spectrum is suppressed in comparison to that of the scalar power spectrum.
|Additional Information:||© 2010 The American Physical Society. Received 3 February 2010; published 26 May 2010. We thank Sean Carroll, Mark Wise, and Matthew Johnson for their helpful comments.|
|Classification Code:||PACS: 98.80.Cq, 04.40.Nr|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||09 Jul 2010 22:38|
|Last Modified:||08 Mar 2013 22:10|
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