Constraints on the moment of inertia of PSR J0737-3039A from GW170817

Abstract

Continued observation of PSR J0737-3039, the double pulsar, is expected to yield a precise determination of its primary component's moment of inertia in the next few years. Since the moment of inertia depends sensitively on the neutron star's internal structure, such a measurement will constrain the equation of state of ultra-dense matter, which is believed to be universal. Independent equation-of-state constraints have already been established by the gravitational-wave measurement of the neutron-star tidal deformability in GW170817. Here, using well-known universal relations among neutron star observables, we translate the reported 90%-credible bounds on tidal deformability into a direct constraint, $I_{\star }=1.15_{-0.24}^{+0.38}\times 10^{45}{\text{ g cm}}^2$, on the moment of inertia of PSR J0737-3039A. Should a future astrophysical measurement of $I_{\star }$ disagree with this prediction, it could indicate a breakdown in the universality of the neutron-star equation of state.

arXiv comment8 pages, 4 figures; matches the published version

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