We present an exact analytical solution of the gravitational field equations describing a static spherically symmetric anisotropic quark matter distribution. The radial pressure inside the star is assumed to obey a li...We present an exact analytical solution of the gravitational field equations describing a static spherically symmetric anisotropic quark matter distribution. The radial pressure inside the star is assumed to obey a linear equation of state, while the tangential pressure is a complicated function of the radial coordinate. In order to obtain the general solution of the field equations a particular density profile inside the star is also assumed. The anisotropic pressure distribution leads to an increase in the maximum radius and mass of the quark star, which in the present model is around three solar masses.展开更多
We extend the static interior Schwarzschild solution to a collapsing model by applying geometrical methods. We examine the field quantities and field equations in the comoving and non-comoving observer systems. The co...We extend the static interior Schwarzschild solution to a collapsing model by applying geometrical methods. We examine the field quantities and field equations in the comoving and non-comoving observer systems. The collapsing stellar object contracts asymptotically to its minimum extent and needs an infinitely long time to arrive at the final state. The event horizon of the exterior Schwarzschild solution is not reached or even crossed. A geometric model of ECOs (eternally collapsing objects) is presented.展开更多
ⅠIn the recent years, with the development of the superstring theory (requiring (1+9) dimensional space time) and the application of the Kaluza-Klein theory to the research of the very early phases of the universe (r...ⅠIn the recent years, with the development of the superstring theory (requiring (1+9) dimensional space time) and the application of the Kaluza-Klein theory to the research of the very early phases of the universe (requiring (1+10) dimensional space-time), higher-dimensional physics has assumed a high measure of importance. Emelyanov et al. have in detail evaluated the study situation on the higher-dimensional space-time.展开更多
文摘We present an exact analytical solution of the gravitational field equations describing a static spherically symmetric anisotropic quark matter distribution. The radial pressure inside the star is assumed to obey a linear equation of state, while the tangential pressure is a complicated function of the radial coordinate. In order to obtain the general solution of the field equations a particular density profile inside the star is also assumed. The anisotropic pressure distribution leads to an increase in the maximum radius and mass of the quark star, which in the present model is around three solar masses.
文摘We extend the static interior Schwarzschild solution to a collapsing model by applying geometrical methods. We examine the field quantities and field equations in the comoving and non-comoving observer systems. The collapsing stellar object contracts asymptotically to its minimum extent and needs an infinitely long time to arrive at the final state. The event horizon of the exterior Schwarzschild solution is not reached or even crossed. A geometric model of ECOs (eternally collapsing objects) is presented.
基金Supported by the Natural Science Foundation of Hebei University,the NationalNatural Science Foundation of China(10471039),the Zhejiang Provincial Natural Science Foundationof China(M103087)
文摘ⅠIn the recent years, with the development of the superstring theory (requiring (1+9) dimensional space time) and the application of the Kaluza-Klein theory to the research of the very early phases of the universe (requiring (1+10) dimensional space-time), higher-dimensional physics has assumed a high measure of importance. Emelyanov et al. have in detail evaluated the study situation on the higher-dimensional space-time.
