Cosmic acceleration and crossing of w=-1 barrier in non-local Cubic Superstring Field Theory model

TL;DR

This paper demonstrates that a non-local tachyon in a CSSFT model causes late-time cosmic acceleration with periodic crossing of the w=-1 barrier, providing explicit asymptotic solutions.

Contribution

It introduces a novel non-local CSSFT model showing cosmic acceleration and crossing of the w=-1 barrier, with explicit asymptotic solutions for the tachyon and Hubble parameter.

Findings

Cosmic acceleration occurs with periodic w=-1 crossing.

Explicit asymptotic solutions for tachyon and Hubble parameter.

Oscillation period depends on CSSFT parameters.

Abstract

We show that the late time rolling of the Cubic Superstring Field Theory (CSSFT) non-local tachyon in the FRW Universe leads to a cosmic acceleration with a periodic crossing of the w=-1 barrier. An asymptotic solution for the tachyon and Hubble parameter by linearizing the non-local equations of motion is constructed explicitly. For a small Hubble parameter the period of oscillations is a number entirely defined by the parameters of the CSSFT action.