Non-perturbative time-dependent String Backgrounds and Axion-induced Optical Activity

Abstract

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 ${\alpha }^{{}^{\prime }}$. This construction is possible in any target space dimension, as a result of the non-trivial 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. Non-trivial optical activity is demonstrated, which constitutes a way of detecting string-inspired axion/dilaton effects in such models.

12 pages

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• Environmental CPT Violation in an Expanding Universe in String Theory
• Constraining Torsion in Maximally symmetric (sub)spaces
• Cosmological Dark sector from a Mimetic-Metric-Torsion perspective
• Mimetic-Metric-Torsion with induced Axial mode and Phantom barrier crossing
• A Gravitational Potential with Extra-dimensions and Spin Effects In Hadronic Reactions
• Non-perturbative Treatments of the Bosonic String and the Axion with Cosmological Implications