Large sound speed in dense matter and the deformability of neutron stars

Reed, Brendan; Horowitz, C. J.

doi:10.1103/physrevc.101.045803

Title: Large sound speed in dense matter and the deformability of neutron stars

Journal Article · Wed Apr 22 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.101.045803· OSTI ID:1660440

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Indiana Univ., Bloomington, IN (United States)

The historic first detection of the binary neutron star merger GW170817 by the LIGO-Virgo collaboration has set a limit on the gravitational deformability of neutron stars. In contrast, radio observations of PSR J0740 + 6620 find a very massive neutron star. Tension between the small deformability and the large maximum mass may suggest that the pressure rises rapidly with density and thus the speed of sound in dense matter is likely a large fraction of the speed of light. Herein, we use these observations and simple constant sound-speed model equations of state to set a lower bound on the maximum speed of sound in neutron stars. If the tidal deformability of a 1.4$$_\odot$$ neutron star is less than 600, as is suggested by subsequent analyses of GW170817, we find that the sound speed in the cores of neutron stars is likely larger than the conformal limit of $$c/\sqrt{3}$$. Implications of this for our understanding of both hadronic and quark-gluon descriptions of dense matter are discussed.

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Research Organization:: Indiana Univ., Bloomington, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)

Grant/Contract Number:: FG02-87ER40365; PHY-1430152; SC0008808

OSTI ID:: 1660440

Alternate ID(s):: OSTI ID: 1615715

Journal Information:: Physical Review C, Vol. 101, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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