Chain Inflation Reconsidered

Details Chain Inflation Reconsidered Chain Inflation Reconsidered

2011-06-11

arxiv.org/abs/1106.2188v2

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, 6 figures; added references, fixed minor typos

Scientific paper

We investigate density perturbations in the chain inflation scenario, where the inflaton undergoes successive tunneling transitions along one field direction. First we show that when the bubble walls associated with such a phase transition meet, they induce the next phase transition and continue to propagate as phase interfaces. Then we present an analytical calculation of the density fluctuations and an estimate of non-Gaussianities such as f_{NL}, which we find to be small (of order 1). To get the right amplitude for the power spectrum, there have to be 10^8 phase transitions per Hubble time, a significant model building challenge. We find that working models of chain inflation must be rather strongly coupled, and thus have a very limited range of validity as effective field theories. We discuss generalizations to the multiple field case, the curvaton scenario, and noncanonical kinetic terms.

Affiliated with

Also associated with

No associations

Rating

Chain Inflation Reconsidered does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Chain Inflation Reconsidered, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chain Inflation Reconsidered will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-413714