1204.0476 (Takashi Arai)

Influence of the dynamical mass generation for light scalar fields in
inflationary universe    [PDF]

Takashi Arai

The infrared effects for light (including massless) minimally coupled scalar fields with quartic self-interaction in de Sitter space is investigated by the 2PI effective action formalism. This formalism partly resums the infinite series of loop diagrams. Due to nonperturbative infrared effects the scalar field acquires the dynamically generated mass in de Sitter space. In this paper, we analyze the physical influence of this dynamical mass generation. Because of its nonperturbative nature, one needs infinite series of divergent terms as counterterms for consistent renormalization of the effective action. The phase structure and the quantum backreaction to the Einstein's field equation are calculated.

View original: http://arxiv.org/abs/1204.0476