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On the Cosmology and Symmetry of Dilaton-Axion Gravity

James E. Lidsey
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Abstract

A global O$(2,2)$ symmetry is found in the Brans-Dicke theory of gravity when the dilaton is coupled to axion and moduli fields. The symmetry is broken if a cosmological constant is introduced. Within the class of spatially homogeneous Bianchi cosmologies, only the type I and V models respect the symmetry. Isotropic cosmological solutions are found for arbitrary spatial curvature. In the region of parameter space relevant to the pre-big bang scenario, the interplay between the scalar fields results in a bouncing cosmology.

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James E. Lidsey. 1996-09-27. On the Cosmology and Symmetry of Dilaton-Axion Gravity. https://arxiv.org/abs/gr-qc/9609063

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