Black hole perturbation in the most general scalar-tensor theory with second-order field equations I: the odd-parity sector

Details Black hole perturbation in the most general scalar-tensor theory with second-order field equations I: the odd-parity sector Black hole perturbation in the most general scalar-tensor theory with second-order field equations I: the odd-parity sector

2012-02-22

arxiv.org/abs/1202.4893v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages

Scientific paper

We perform a fully relativistic analysis of odd-type linear perturbations around a static and spherically symmetric solution in the most general scalar-tensor theory with second-order field equations. It is shown that, as in the case of general relativity, the quadratic action for the perturbations reduces to the one having only a single dynamical variable, from which concise formulas for no-ghost and no-gradient instability conditions are derived. Our result is applicable to all the theories of gravity with an extra scalar degree of freedom. We demonstrate how the generic formulas can be applied to some particular examples such as the Brans-Dicke theory, $f(R)$ models, and Galileon gravity.

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