Spherically symmetric steady states of John elastic bodies in general relativity
Artikel i vetenskaplig tidskrift, 2014

We study some properties of static spherically symmetric elastic bodies in general relativity using both analytical and numerical tools. The materials considered belong to the class of John elastic materials and reduce to perfect fluids when the rigidity parameter is set to zero. We find numerical support that such elastic bodies exist with different possible shapes (balls, single shells and multiple shells) and that their gravitational redshift can be very large (z approximate to 2.8) without violating the dominant energy condition. Moreover we show that the elastic body has finite radius even in the case when the constitutive equation of the elastic material is a perturbation of a polytropic fluid without finite radius, thereby concluding that such fluids are structurally unstable within the larger class of elastic matter models under study.

spherical symmetry

static solutions

elasticity

Författare

Håkan Andreasson

Chalmers, Matematiska vetenskaper, Matematik

Göteborgs universitet

Simone Calogero

Chalmers, Matematiska vetenskaper, Matematik

Göteborgs universitet

Classical and Quantum Gravity

0264-9381 (ISSN)

Vol. 31 16 Art. no. 165008-

Ämneskategorier

Fysik

DOI

10.1088/0264-9381/31/16/165008

Mer information

Skapat

2017-10-07