Initial Conditions for Inflation

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Published 27 January 2003 • Published under licence by IOP Publishing Ltd
, , Citation Nemanja Kaloper et al JHEP11(2002)037 DOI 10.1088/1126-6708/2002/11/037

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Author affiliations

1 Department of Physics, Stanford University, Stanford, CA 94305, USA

2 Department of Physics, University of California, Davis, CA 95616, USA

3 Brandeis University, Physics Department, MS 057, POB 549110, Waltham, MA 02454, USA

4 SLAC Theory Group, MS 81, 2575 Sand Hill Road, Menlo Park, CA 94025, USA

Dates

  1. Received 8 October 2002
  2. Accepted 19 November 2002
  3. Published

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1126-6708/2002/11/037

Abstract

Free scalar fields in de Sitter space have a one-parameter family of states invariant under the de Sitter group, including the standard thermal vacuum. We show that, except for the thermal vacuum, these states are unphysical when gravitational interactions are included. We apply these observations to the quantum state of the inflaton, and find that at best, dramatic fine tuning is required for states other than the thermal vacuum to lead to observable features in the CMBR anisotropy.

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10.1088/1126-6708/2002/11/037