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Finds limits on scalar mass and coupling parameters in compact binaries, suggesting implications for gravity theories.
Scalar-tensor theories are among the simplest extensions of general relativity. In theories with light scalars, deviations from Einstein's theory of gravity are determined by the scalar mass mₛ and by a Brans-Dicke-like coupling parameter ωBD. We show that gravitational-wave observations of nonspinning neutron star-black hole binary inspirals can be used to set lower bounds on ωBD and upper bounds on the combination mₛ/√ωBD. We estimate via a Fisher matrix analysis that individual observations with signal-to-noise ratio ρ would yield (mₛ/√ωBD)(ρ/10)10^-15, 10^-16, and 10^-19 eV for Advanced LIGO, ET, and eLISA, respectively. A statistical combination of multiple observations may further improve these bounds.
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Berti et al. (2012) studied this question.
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