Wormholes and baby universes in scalar-tensor gravity

Details Wormholes and baby universes in scalar-tensor gravity Wormholes and baby universes in scalar-tensor gravity

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nuphb.333..221a&link_type=abstract

Nuclear Physics B, Volume 333, Issue 1, p. 221-252.

Physics

Nuclear Physics

15

Scientific paper

The existence of euclidean wormhole solutions is demonstrated in two types of scalar-tensor theories of gravity, Brans-Dicke and induced gravity, for the case when the scalar field ψ has a U(1) charge. In both theories the scalar field equations of motion for the modulus φ are independent of the wormhole charge Q so that for constant φ consistent solutions are obtained for arbitrary Q. In Brans-Dicke, when φ varies across the wormhole throat, ``lopsided'' wormholes result which attach two spaces with different values of the gravitational constant. In induced gravity, wormhole and baby universe solutions are found with φ interpolating between the symmetric and broken phases. These can have finite (through cutoff dependent) action or infinite actiob and can display non-trivial structure for small values of the radial variable.

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