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Journal of Cosmology and Astroparticle Physics 09 (2010) 034
Collapse of Small-Scale Density Perturbations during Preheating in Single Field Inflation
Karsten Jedamzik1, Martin Lemoine2, Jerome Martin2

After cosmic inflation and before the transition to radiation domination, the cosmic energy density may have been dominated during an extended period by an oscillating massive scalar condensate. We show that during this period, sub-Hubble scale perturbations are subject to a metric preheating instability in the narrow resonance regime. We analyze in detail both, quadratic and quartic potentials. The instability leads to the growth of density perturbations which in many cases become non-linear already before the beginning of a radiation dominated Universe. This is particularly the case when requiring a phenomenologically preferred low reheat temperature. These early structures may lead to the emission of gravitational waves and the production of primordial black holes. Furthermore, it is not clear if they could modify the prediction of linear curvature perturbations on very large scales.
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
2 :  IAP - Institut d'Astrophysique de Paris
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Physique/Relativité Générale et Cosmologie Quantique

Physique/Physique des Hautes Energies - Phénoménologie

Physique/Physique des Hautes Energies - Théorie
Inflation – physics of the early universe – cosmological perturbation theory
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