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Scalar charges and pulsar-timing observables in the presence of nonminimally coupled scalar fields

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Pulsar-timing has become a celebrated tool for probing modifications to General Relativity in the strong-field surroundings of neutron stars. Here we investigate whether scalar-tensor theories that incorporate a nonminimally coupled… Click to show full abstract

Pulsar-timing has become a celebrated tool for probing modifications to General Relativity in the strong-field surroundings of neutron stars. Here we investigate whether scalar-tensor theories that incorporate a nonminimally coupled scalar degree of freedom may pass pulsar-timing tests, by computing the scalar charges entering such observables. In particular we show that for positive values of the nonminimal coupling $\xi$, pulsar-timing constraints may be evaded even in the presence of spontaneous scalarization.

Keywords: nonminimally coupled; presence; coupled scalar; charges pulsar; pulsar timing; scalar charges

Journal Title: Physical Review D
Year Published: 2019

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