Spontaneous scalarization in generalised scalar-tensor theory

11 May 2020  ·  Andreou Nikolas, Franchini Nicola, Ventagli Giulia, Sotiriou Thomas P. ·

Spontaneous scalarization is a mechanism that endows relativistic stars and black holes with a nontrivial configuration only when their spacetime curvature exceeds some threshold. The standard way to trigger spontaneous scalarization is via a tachyonic instability at the linear level, which is eventually quenched due to the effect of non-linear terms... In this paper, we identify all of the terms in the Horndeski action that contribute to the (effective) mass term in the linearized equations and, hence, can cause or contribute to the tachyonic instability that triggers scalarization. read more

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General Relativity and Quantum Cosmology High Energy Physics - Theory