Dynamics in Nonlocal Cosmological Models Derived from String Field Theory

TL;DR

This paper introduces a new method for solving nonlocal Friedmann equations in cosmological models derived from string field theory, presenting solutions with bouncing behavior and late-time de Sitter expansion, and discusses their implications for the cosmological constant.

Contribution

It proposes a novel approach to solving nonlocal cosmological equations and provides explicit solutions in string-inspired models, including bouncing and de Sitter phases.

Findings

Obtained nonsingular bouncing solutions in p-adic cosmology.

Derived full solutions with equation of state w=-1 at large times.

Discussed potential for realistic cosmological constant values.

Abstract

A general class of nonlocal cosmological models is considered. A new method for solving nonlocal Friedmann equations is proposed, and solutions of the Friedmann equations with nonlocal operator are presented. The cosmological properties of these solutions are discussed. Especially indicated is $p$-adic cosmological model in which we have obtained nonsingular bouncing solution and string field theory tachyon model in which we have obtained full solution of nonlocal Friedmann equations with $w=-1$ at large times. The possibility of obtaining realistic value of cosmological constant from nonlocal cosmological models is also discussed.