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4 papers · 2 filters
Time-dependent Orbifolds and String Cosmology
Lorenzo Cornalba, Miguel S. Costa
In these lectures, we review the physics of time-dependent orbifolds of string theory, with particular attention to orbifolds of three-dimensional Minkowski space. We discuss the p…
Classical and Quantum Strings in compactified pp-waves and Godel type Universes
Daniel Brace, Carlos A. R. Herdeiro, Shinji Hirano
We consider Neveu-Schwarz pp-waves with spacetime supersymmetry. Upon compactification of a spacelike direction, these backgrounds develop Closed Null Curves (CNCs) and Closed Time…
The Kerr-Newman-Godel Black Hole
C. A. R. Herdeiro
By applying a set of Hassan-Sen transformations and string dualities to the Kerr-Godel solution of minimal D=5 supergravity we derive a four parameter family of five dimensional so…
On the Classical Stability of Orientifold Cosmologies
L. Cornalba, M. S. Costa
We analyze the classical stability of string cosmologies driven by the dynamics of orientifold planes. These models are related to time-dependent orbifolds, and resolve the orbifol…