APT3 - Extreme Properties of Neutron Stars: Observations and Theory |
Speaker_ |
Hledik, Stanislav |
Co-autors |
Zdenek Stuchlik |
Talk _ |
Dynamical stability of fluid spheres in spacetimes with a nonzero cosmological constant |
Abstract _ |
We determine the equation governing small radial oscillations and related Sturm-Liouville eigenvalue problem for eigenmodes of the oscillations in the case of spherically symmetric configurations of perfect fluid in spacetimes with a nonzero cosmological constant. Uniform-density and polytropic cases are investigated. It is shown that repulsive cosmological constant rises the critical adiabatic index and decreases the critical radius under which the dynamical instability occurs. |