2001/11/24 by R. P. Woodard, Woodard, R. P. · 1 citation
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0111462
14 pages, LaTeX 2 epsilon, 1 figure, talk presented at COSMO-01, Rovaniemi, Finland, Aug. 29 to Sept. 4, 2001
arxiv created 2001/11/24 · openalex publication_date 2001/11/24 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Quantum gravitational back-reaction offers the potential of simultaneously resolving the problem of the cosmological constant and providing a natural model of inflation in which scalars play no special role. In this model inflation begins because the cosmological constant is not unnaturally small. It ends through the accumulated gravitational interaction between virtual gravitons which are ripped apart by the inflationary expansion. Although perturbative techniques can be used to study the effect as long as it remains weak, they break down when back-reaction begins to exert an appreciable effect on the expansion rate. In this talk I argue that the end of inflation is sudden and that there is actually an overshoot into deflation. (This incidentally provides a very efficient mechanism for reheating.) The subsequent evolution can be understood in terms of a competition between the opening of the past light cone and the formation of a thermal barrier to the persistence of correlations from during the period of inflation.