Matrix string description of cosmic singularities in a class of time-dependent solutions

A large class of time-dependent solutions with 1/2 supersymmetry were found previously. These solutions involve cosmic singularities at early time. In this Letter, we study if matrix string description of the singularities in these solutions with backgrounds is possible and present several examples where the solutions can be described well in the perturbative picture. (c) 2006 Elsevier B.V. All rights reserved.