Surface gravity of neutron stars and strange stars
Abstract
The upper bound on the value of the surface gravity, gs, for neutron stars with equations of state respecting vsound <= c, is derived. This bound is inversely proportional to the maximum allowable mass Mmax, and it reads gs <= 1.411 x 1015 (Msun/Mmax) cm/s2. It implies an absolute upper bound 7.4 x 1014 cm/s2 if one uses the 2sigma lower bound on the neutron mass measured recently in 4U1700-37, 1.9 Msun. A correlation between gs and the compactness parameter 2GM/Rc2 for baryonic stars is analyzed. The properties of gs of strange quark stars and its upper bounds are discussed using the scaling properties of the strange-star models.
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