Deformations of Cosmological Solutions of D=11 Supergravity

Understand

We study Lunin-Maldacena deformations of cosmological backgrounds of D=11 supergravity which gives an easy way to generate solutions with nonzero 4-form flux starting from solutions of pure Einstein equations which possess at least three U(1) isometries.

• We illustrate this on the vacuum S-brane solution from which the usual SM2-brane solution is obtained.
• Applying the method again, one either gets the recently found S-brane system where contribution of the Chern-Simons term to field equations is non-zero or the SM2-SM2(0) intersection, depending on which U(1) directions are used during the process.
• Repeated usage of the procedure gives rise to configurations with several overlapping S-branes some of which are new.