Chern-Simons S-Brane Solutions in M-theory and Accelerating Cosmologies

TL;DR

This paper constructs intersecting S-brane solutions in 11-dimensional supergravity with non-zero Chern-Simons contributions, explores their properties, and derives four-dimensional accelerating cosmologies through various compactifications.

Contribution

It presents new intersecting S-brane solutions with non-zero Chern-Simons terms and analyzes their compactifications leading to accelerating cosmologies.

Findings

Two compactifications yield accelerating cosmologies.

Expansion factors in these cosmologies are of order unity.

Static versions and reductions to type IIA are also found.

Abstract

We construct an intersecting S-brane solution of 11-dimensional supergravity for which the contribution of the Chern-Simons term to the field equations is non-zero. After studying some of its properties, we consider three different compactifications (each with 3 separate subcases) of this system to 4-dimensions. Two of these give accelerating cosmologies, however their expansion factors are of order unity. We also find two static versions of this configuration and its dimensional reduction to type IIA theory.