Phys. Rev. D 58, 043503 (1998) [11 pages]Symmetries for generating string cosmologiesReceived 17 February 1998; published 1 July 1998 We discuss the symmetry properties of the low-energy effective action of the type IIB superstring that may be employed to derive four-dimensional solutions. A truncated effective action, compactified on a six-torus, but including both Neveu-Schwarz–Neveu-Schwarz and Ramond-Ramond field strengths, can be expressed as a non-linear sigma model which is invariant under global SL(3,R) transformations. This group contains as a sub-group the SL(2,R) symmetry of the ten-dimensional theory and a discrete Z2 reflection symmetry which leads to a further SL(2,R) sub-group. The symmetries are employed to analyze a general class of spatially homogeneous cosmological solutions with non-trivial Ramond-Ramond fields. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.58.043503
DOI:
10.1103/PhysRevD.58.043503
PACS:
98.80.Cq, 04.50.+h, 11.25.-w
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