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Chromothermal oscillations and collapse of strange stars to black holes: astrophysical implications
Authors:Manjari Bagchi,Rachid Ouyed,Jan Staff,Subharthi Ray,Mira Dey &dagger  , Jishnu Dey &Dagger  
Affiliation:Tata Institute of Fundamental Research, Homi Bhaba Road, Colaba, Mumbai 400 005, India;Department of Physics, Presidency College, 86/1, College Street, Kolkata 700 073, India;Department of Physics and Astronomy, University of Calgary, Canada AB T2N 1N4;Department of Physics, Purdue University, 525 Northwestern Avenue West Lafayette, IN 47907-2036, USA;Inter University Centre for Astronomy and Astrophysics, Ganeshkhind, Pune 411 007, India
Abstract:We study the effects of temperature on strange stars. It is found that the maximum mass of the star decreases with the increase of temperature, as at high temperatures the equations of state become softer. Moreover, if the temperature of a strange star increases, keeping its baryon number fixed, its gravitational mass increases and its radius decreases. This leads to a limiting temperature, where it turns into a black hole. These features are the result of a combined effect of the change of gluon mass and the quark distribution with temperature. We report on a new type of radial oscillation of strange stars, driven by what we call 'chromothermal' instability. We also discuss the relevance of our findings in the astrophysics of core collapse supernovae and gamma-ray bursts.
Keywords:black hole physics    dense matter    equation of state    instabilities    stars: neutron    stars: oscillations
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