Maximum elastic deformations of compact stars with exotic equations of state

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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 10-4 rather than a few times 10-7 for conventional neutron stars, and hybrid quark-baryon or meson-condensate stars might sustain up to 10-5. Most of the difference is due to the shear modulus, which can be up to 1033erg/cm3 rather than 1030erg/cm3 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.

Original languageEnglish
Article number211101
JournalPhysical Review Letters
Issue number21
StatePublished - Nov 18 2005


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