On Inflationary cosmological models

The most common mechanisms leading to in ation are based on models of gravity minimally coupled to a scalar field rolling on a suitable potential V. We discuss such a model defined by the action I = ∫√-g p [R -2 (φ)2 )] d4x, in order to find exact general isotropic and homogeneous cosmological solutions displaying an in ationary behavior at early times and a power-law expansion at late times. We also study the effect of the inclusion of matter (in the form of a perfect uid): in this case, we do not find exact solutions because of the non-integrability of the field equations, but we can investigate their global properties (and hence their stability) by means of methods of the theory of dynamical systems.

Grantor dc:publisher

Università degli Studi di Cagliari

Year dc:date

2016

Author dc:creator

• PINTUS, NICOLA

• cosmologia
• cosmology
• inflation
• inflazione
• Settore MAT/07 - Fisica Matematica

Statement dc:rights

• info:eu-repo/semantics/openAccess
• license:Non specificato

Language dc:language

eng

Handle dc:identifier

http://hdl.handle.net/11584/266648

OAI identifier oai:identifier

oai:iris.unica.it:11584/266648