Open AccessMixed‐phase induced core‐quakes and the changes in neutron‐star parameters
Author(s) -
Bejger M.,
Haensel P.,
Zdunik J. L.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.08933.x
Subject(s) - physics , neutron star , moment of inertia , core (optical fiber) , quake (natural phenomenon) , strange matter , equation of state , radius , neutron , nucleation , nuclear physics , astrophysics , classical mechanics , quantum mechanics , thermodynamics , astronomy , computer security , computer science , optics
We present approximate formulae describing the changes in neutron‐star parameters caused by the first‐order phase transition to an exotic state (pion or kaon condensate, quark matter) resulting in formation of a mixed‐phase core. The analytical formulae for the changes in radius, moment of inertia and the amount of energy released during the core‐quake are derived using the theory of linear response of stellar structure to the core transformation. Numerical coefficients in these formulae are obtained for two realistic equations of state (EOSs) of dense matter. The problem of nucleation of the exotic phase as well as possible astrophysical scenarios leading to a core‐quake phenomenon are also discussed.