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Loop quantum cosmology and slow roll inflation

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>2010
<mark>Journal</mark>Physics Letters B
Issue number2
Volume694
Number of pages5
Pages (from-to)108-112
Publication StatusPublished
<mark>Original language</mark>English

Abstract

In loop quantum cosmology (LQC) the big bang is replaced by a quantum bounce which is followed by a robust phase of super-inflation. Rather than growing unboundedly in the past, the Hubble parameter vanishes at the bounce and attains a finite universal maximum at the end of super-inflation. These novel features lead to an unforeseen implication: in presence of suitable potentials all LQC dynamical trajectories are funneled to conditions which virtually guarantee slow roll inflation with more than 68 e-foldings, without any input from the pre-big bang regime. This is in striking contrast to certain results in general relativity, where it is argued that the a priori probability of obtaining a slow roll with 68 or more e-foldings is suppressed by a factor e−204.