K. Sravan Kumar
Department of Physics, Centre of mathematics and applications, University of Beira Interior

Abstract
In this talk, we start with a review on the concept of cosmological attractor models (CAM) in the sense of their use as a generalization of simpler models such as Starobinsky and Higgs Inflation. These models were found to be quite compatible with the CMB data and also consistent in the context of N=1 SUGRA. We will then discuss in detail the framework of alpha- attractor models in the context of slow-roll inflation. Subsequently, we study the possibility of non-slow-roll inflation in alpha- attractor models by relaxing the requirement of inflaton potential flatness and allow a sufficiently steep potential to support 60-efoldings. We show that within non-slow-roll dynamics, the alpha-attractor model is compatible with any value of r < 0.1. We further explore the relation between inflaton dynamics and the alpha parameter, which is also related to the curvature of Kähler manifold in the SUGRA embedding of this model.

2015 November 03, 10:30

IA/U.Lisboa
Faculdade de Ciências da Universidade de Lisboa (C6.2.51)
Campo Grande, 1749-016 Lisboa