Coarse-grained back reaction in single scalar field driven inflation
Abstract
We introduce a self-consistent stochastic coarse-graining method, which includes both metric and scalar field fluctuations, to investigate the back reaction of long-wavelength perturbations in single-scalar driven inflation, up to the second (one loop) order. We demonstrate that, although back reaction cannot be significant during the last 70 e-foldings of inflation with a smooth potential, there exist non-smooth inflaton potentials which allow significant back reaction, and are also consistent with cosmological observations. Such non-smooth potentials may lead to the generation of massive primordial black holes, which could be further used to constrain/verify these models.
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- January 2005
- DOI:
- 10.1088/1475-7516/2005/01/011
- arXiv:
- arXiv:gr-qc/0405117
- Bibcode:
- 2005JCAP...01..011G
- Keywords:
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- General Relativity and Quantum Cosmology;
- Astrophysics;
- High Energy Physics - Phenomenology;
- High Energy Physics - Theory
- E-Print:
- 6 pages, 1 figure