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  • Access by Xinjiang University

Scalar-tensor gravitational effects on vacuum decay

Frank S. Accetta and Paul Romanelli

  • Center for Theoretical Physics, Department of Physics, Yale University, New Haven, Connecticut 06511

Phys. Rev. D 41, 3024 – Published 15 May, 1990

DOI: https://doi.org/10.1103/PhysRevD.41.3024

Abstract

Motivated by a recently proposed "extended" inflation scenario, we apply the formalism of Coleman and De Luccia to the false-vacuum decay of a scalar field coupled to a scalar-tensor theory of gravity. In particular, we discuss a model for false-vacuum decay of a scalar field σ minimally coupled in a Brans-Dicke-like theory of gravity. In such theories, the effective gravitational constant is a function of a scalar field φ. In general, φ will have nontrivial dynamics in the false vacuum, and as φ varies the decay rate of the σ false vacuum need not be constant. We present both an explicit "thin-wall" calculation of the decay rate, and a more general numerical "thick-wall" calculation, comparing them to the standard results for Einstein gravity. We consider some questions of principle concerning boundary conditions for the φ field. We discuss the consequences of these results for extended models of inflation.

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