First CMB Constraints on the Inflationary Reheating Temperature - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




First CMB Constraints on the Inflationary Reheating Temperature - Astrophysics > Cosmology and Nongalactic Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We present the first Bayesian constraints on the single field inflationaryreheating era obtained from Cosmic Microwave Background CMB data. Afterdemonstrating that this epoch can be fully characterized by the so-calledreheating parameter, we show that it is constrained by the seven yearsWilkinson Microwave Anisotropies Probe WMAP7 data for all large and smallfield models. An interesting feature of our approach is that it yields lowerbounds on the reheating temperature which can be combined with the upper boundsassociated with gravitinos production. For large field models, we find theenergy scale of reheating to be higher than those probed at the Large HadronCollider, Ereh > 17.3 TeV at 95% of confidence. For small field models, weobtain the two-sigma lower limits Ereh > 890 TeV for a mean equation of stateduring reheating = -0.3 and Ereh > 390 GeV for = -0.2. Thephysical origin of these constraints is pedagogically explained by means of theslow-roll approximation. Finally, when marginalizing over all possiblereheating history, the WMAP7 data push massive inflation under pressure p <2.2 at 95% of confidence where p is the power index of the large fieldpotentials while they slightly favor super-Planckian field expectation valuesin the small field models.



Autor: Jerome Martin, Christophe Ringeval

Fuente: https://arxiv.org/



DESCARGAR PDF




Documentos relacionados