R Holman and Andrew J Tolley JCAP05(2008)001 doi:10.1088/1475-7516/2008/05/001
R Holman1 and Andrew J Tolley2
Show affiliationsWe use the techniques of effective field theory in an expanding universe to examine the effect of choosing an excited inflationary initial state built over the Bunch–Davies state on the CMB bi-spectrum. We find that, even for Hadamard states, there are unexpected enhancements in the bi-spectrum for certain configurations in momentum space due to interactions of modes in the early stages of inflation. These enhancements can be parametrically larger than the standard ones and are potentially observable in future data. These initial state effects have a characteristic signature in l-space which distinguishes them from the usual contributions, with the enhancement being most pronounced for configurations corresponding to flattened triangles for which two momenta are collinear.
quantum field theory on curved space
E-print Number: 0710.1302
Cited: by |
Refers: to
Issue 05 (May 2008)
Received 6 February 2008, accepted for publication 15 April 2008
Published 6 May 2008
R Holman and Andrew J Tolley JCAP05(2008)001
L. Mersini-Houghton and R. Holman JCAP02(2009)006
Federico I. Pelupessy et al. 2007 ApJ 665 107
Judith G. Cohen et al. 2008 ApJ 672 320
A. Buzzoni et al 2009 ApJ 703 L127
Yuexing Li et al. 2007 ApJ 665 187
Masataka Fukugita and P. J. E. Peebles 2004 ApJ 616 643