Sound Velocity Bound and Neutron Stars

Bedaque, Paulo; Steiner, Andrew W.

doi:10.1103/PhysRevLett.114.031103

Title: Sound Velocity Bound and Neutron Stars

Journal Article · Wed Jan 21 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.031103· OSTI ID:1265809

Bedaque, Paulo ^[1]; Steiner, Andrew W. ^[2]

Univ. of Maryland, College Park, MD (United States)
Univ. of Washington, Seattle, WA (United States); Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

A conjecture that the velocity of sound in any medium is smaller than the velocity of light in vacuum divided by sqrt(3). Simple arguments support this bound in nonrelativistic and/or weakly coupled theories. Moreover, the bound has been demonstrated in several classes of strongly coupled theories with gravity duals and is saturated only in conformal theories. Here, we point out that the existence of neutron stars with masses around two solar masses combined with the knowledge of the equation of state of hadronic matter at low densities is in strong tension with this bound.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-00OR22725; FG02-93ER-40762

OSTI ID:: 1265809

Alternate ID(s):: OSTI ID: 1181543

Report Number(s):: INT-PUB-14-021

Journal Information:: Physical Review Letters, Vol. 114, Issue 3; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 160 works

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