Loop quantum cosmology and slow roll inflation

By Abhay Ashtekar, David Sloan. 2009

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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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/e394cbc36e75c093ccf0686c470baf29978bc1f3

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Citations in the corpus

Loop quantum cosmology: a status report (2011, background): “Then one can unambiguously define a measure dμ̃L on S̃ (up to an irrelevant overall constant): In effective LQC one obtains [82, 83]”