Radial pulsations and stability of anisotropic stars with quasi-local equation of state (CROSBI ID 167685)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Horvat, Dubravko ; Ilijić, Saša ; Marunović, Anja
engleski
Radial pulsations and stability of anisotropic stars with quasi-local equation of state
Quasi-local variables, i.e. quantities whose values can be derived from physics accessible within an arbitrarily small neighborhood of a spacetime point, are used to construct the equation of state (EoS) for the anisotropic fluid in the spherical symmetry. One parameter families of equilibrium solutions are obtained making it possible to assess stability properties by means of the standard M(R) method. Normal modes of radial pulsation are computed as well and are found to confirm the onset of instability as predicted by the M(R) method. As an example, a stable configuration with outwardly increasing energy density in the core is obtained with a simple quasi-local extension of the polytropic EoS. It is also found that the loss of stability occurs at higher surface compactness when the anisotropy of pressures is present.
relativistic stars; anisotropic fluid; stability; radial pulsations
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Podaci o izdanju
28 (2)
2011.
025009-1-025009-12
objavljeno
0264-9381
10.1088/0264-9381/28/2/025009