Journal
PHYSICAL REVIEW D
Volume 78, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.066001
Keywords
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Funding
- European Union [MRTN-CT-2006035863]
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Conformal invariance for bosonic strings in time-dependent backgrounds of graviton, dilaton, and Kalb-Ramond field is obtained by imposing Weyl-beta functions to be homogeneous in time, to all orders in alpha'. This construction is possible in any target-space dimension, as a result of the nontrivial background configurations. The electromagnetic effects of the antisymmetric-tensor field, when coupled to an Abelian (electromagnetic) gauge field, are discussed in the framework of a four-dimensional Minkowski universe, for concreteness. Nontrivial optical activity is demonstrated, which constitutes a way of detecting string-inspired axion/dilaton effects in such models.
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