Analysis of scalar perturbations in cosmological models with a non-local scalar field

Details Analysis of scalar perturbations in cosmological models with a non-local scalar field Analysis of scalar perturbations in cosmological models with a non-local scalar field

2010-09-03

arxiv.org/abs/1009.0746v2

Class.Quant.Grav.28:085019,2011

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX, 25 pages, 1 figure, v2: Subsection 3.2 and Section 5 added, references added, accepted for publication in Class. Quant.

Scientific paper

10.1088/0264-9381/28/8/085019

We develop the cosmological perturbations formalism in models with a single non-local scalar field originating from the string field theory description of the rolling tachyon dynamics. We construct the equation for the energy density perturbations of the non-local scalar field in the presence of the arbitrary potential and formulate the local system of equations for perturbations in the linearized model when both simple and double roots of the characteristic equation are present. We carry out the general analysis related to the curvature and entropy perturbations and consider the most specific example of perturbations when important quantities in the model become complex.

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