Year: 1998
Type: article
Abstract: 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 ${\mathrm{Z}}_{2}$ 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.
Authors: E. J. Copeland, James E. Lidsey, David Wands
Institution: University of Sussex
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2124554261