Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1999-01-05
Gen.Rel.Grav. 31 (1999) 1075-1086
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
12 pages in LaTex
Scientific paper
In this paper we continue to study a class of four-dimensional gravity models with n Abelian vector fields and Sp(2n)/U(n) coset of scalar fields. This class contains General Relativity (n=0) and Einstein-Maxwell dilaton-axion theory (n=1), which arizes in the low-energy limit of heterotic string theory. We perform reduction of the model with arbitrary $n$ to three dimensions and study the subgroup of non-gauge symmetries of the resulting theory. First, we find an explicit form these symmetries using Ernst matrix potential formulation. Second, we construct new matrix variable which linearly transforms under the action of the non-gauge transformations. Finally, we establish one general invariant of the non-gauge symmetry subgroup, which allow us to clarify this subgroup structure.
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