Constructing de Sitter space and Dark Matter with Dynamical Tension Strings

TL;DR

This paper explores how dynamical string tensions in a modified measure formalism can generate de Sitter space and dark matter candidates, proposing a new braneworld solution that avoids swampland constraints.

Contribution

It introduces a model with variable string tensions coupled to a tension scalar, leading to braneworld de Sitter solutions and dark matter candidates with potential dark copies of the standard model.

Findings

A braneworld solution with two string tensions induces de Sitter space.

Strings with different tensions can serve as dark matter.

The model avoids swampland constraints of standard string theory.

Abstract

The string tensions can be dynamical in the modified measure formalism and appear as an additional dynamical degrees of freedom . These tensions may not be universal, instead, each string generates its own tension. We then consider a new bulk field that can couple to the strings, the tension scalar which changes locally the tension along the world sheet. In the case with two string tensions there is a braneworld solution which gives rise to an induced de Sitter space in the brane, avoiding swampland constraints of the standard string theory. Strings with different tension to ours can appear also as Dark Matter and since they share the same space and compactifications as visible matter, they should lead to Dark copies of the standard model,