Maximum elastic deformations of compact stars with exotic equations of state
arXiv:astro-ph/0503399 · doi:10.1103/PhysRevLett.95.211101
Abstract
I make the first estimates of maximum elastic quadrupole deformations sustainable by alternatives to conventional neutron stars. Solid strange quark stars might sustain maximum ellipticities (dimensionless quadrupoles) up to a few times rather than a few times for conventional neutron stars, and hybrid quark-baryon or meson-condensate stars might sustain up to . Most of the difference is due to the shear modulus, which can be up to erg/cm rather than erg/cm in the inner crust of a conventional neutron star. Maximum solid strange star ellipticities are comparable to upper limits obtained for several known pulsars in a recent gravitational-wave search by LIGO. Maximum ellipticities of the more robust hybrid model will be detectable by LIGO at initial design sensitivity. A large shear modulus also strengthens the case for starquakes as an explanation for frequent pulsar glitches.
arXiv comment4 pages, no figures; Introduction reworked, SGR1806-20 mentioned in Implications, minor changes elsewhere; final version as appearing in PRL
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