22-27 March 2015
Hotel do Bosque
Brazil/East timezone

Electrically charged strange quark stars: equilibrium and stability

Not scheduled
3h 30m
Hotel do Bosque

Hotel do Bosque

Rodovia Mário Covas (Rio-Santos) BR - 101 Sul, Km 533, Angra dos Reis, RJ, Brazil
Poster Hadronic and quark matter - applications in astrophysics

Speaker

Dr José Arbañil (ITA)

Description

We investigate the hydrostatic equilibrium configuration and the stability versus radial perturbation of electrically charged strange quark stars composed by a charged perfect fluid. We consider that the pressure of the fluid is computed from the MIT bag model equation of state and the charge distribution from a power-law function of the radial coordinate. These studies are possible through the numerical solutions of the hydrostatic equilibrium equation (Tolman-Oppenheimer-Volkoff equation) and the Chandrasekhar's equation pulsation, both equations are modified of their original versions for the inclusion of the electric charge. We consider only electrical charge values that affects appreciably the star structure, which implies an electric field around $10^{20}[\rm V/cm]$. Compared to the radial pressure, the electrical energy density associated to this electric field is appreciable near the surface of the star. We found that for some range of parameters the electric charge helps to grow the stability of the objects under study. We determine that the zero frequency of oscillation is found in a central energy density larger than the one considered to obtain the maximum mass reached for the charged strange star.

Primary author

Co-author

Prof. Manuel Malheiro (ITA)

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