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arXiv · 1908.10440

Particle Probes with Superradiant Pulsars

David E. Kaplan·Surjeet Rajendran·Paul Riggins
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Abstract

We demonstrate that rotational superradiance can be efficient in millisecond pulsars. Measurements from the two fastest known pulsars PSR J1748-2446ad and PSR B1937+21 can place bounds on bosons with masses below 10^{-11} eV. The bounds are maximally good at masses corresponding to the rotation rate of the star, where scalar interactions that mediate forces ~ 10^6 times weaker than gravity are ruled out, exceeding existing fifth force constraints by 3 orders of magnitude. For certain neutron star equations of state, these measurements would also constrain the QCD axion with masses between 5 10^{-13} and 3 10^{-12} eV. Despite the ability of most neutron star equations of state to support frequencies as high as ~ 1500 Hz, the observed absence of pulsars above ~ 700 Hz could be due to the existence of a new particle of mass ~ 10^{-11} eV with a Yukawa coupling to nucleons.

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David E. Kaplan, Surjeet Rajendran, Paul Riggins. 2019-08-27. Particle Probes with Superradiant Pulsars. https://arxiv.org/abs/1908.10440

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