Rolling Tachyon in Brane World Cosmology from Superstring Field Theory

TL;DR

This paper explores how the over-abundance problem of pressureless tachyonic matter in superstring field theory can be resolved within brane inflation models by energy transfer to the universe and cosmic strings.

Contribution

It proposes a natural solution to the tachyon over-abundance issue by detailing energy drainage mechanisms during brane inflation.

Findings

Most tachyon energy heats the universe during inflation.

Remaining tachyon energy forms a network of cosmic strings.

The scenario aligns with superstring field theory predictions.

Abstract

The pressureless tachyonic matter recently found in superstring field theory has an over-abundance problem in cosmology. We argue that this problem is naturally solved in the brane inflationary scenario if almost all of the tachyon energy is drained (via its coupling to the inflaton and matter fields) to heating the universe, while the rest of the tachyon energy goes to a network of cosmic strings (lower-dimensional BPS D-branes) produced during the tachyon rolling at the end of inflation.