Neutron stars as laboratories for testing extreme gravity

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Kent Yagi (University of Virginia)

Due to their high compactness and strong gravitational field, neutron stars offer us natural astrophysical laboratories to test extreme gravity. In this talk, I will explain such tests with binary pulsars and multimessenger observations of neutron stars. For the first part, I will first explain a general formalism to test gravity through the orbital decay rate, followed by specific examples in scalar-tensor and vector-tensor theories. For the second part, I will focus on using universal relations among neutron star observables that do not depend sensitively on the equations of state and how such relations allow us to perform strong-field tests of gravity without being biased by uncertainties in nuclear physics.

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