Speaker
Aranguren, Eneko
(University of the Basque Country (EHU))
Description
Static and spherically symmetric isotropic compact stars are known to exist and be unique for a given monotonic equation of state E(P) and central pressure Pc, provided that Λ ≤ 0, or 0 < Λ < κE(r)/2 holds inside the star. In this work, we extend these results in two directions. First, we relax the standard condition for monotonicity and smoothness of E(P), and generalize the formalism for anisotropic configurations. Second, we show how for Λ > 0 uniqueness is lost, as the exterior spacetime may either be entirely vacuum, or contain a variety of thick shells of matter.
Authors
Aranguren, Eneko
(University of the Basque Country (EHU))
Dr
Vera, Raül
(University of the Basque Country (EHU))