RAGtime 24

Session

Solutions for Compact Objects in GR

10 Oct 2022, 16:40

Opava

Conveners

Solutions for Compact Objects in GR

• Thomas Pappas (Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava)

23. An 'exact' modified Tolman VII solution

Camilo Posada

10/10/2022, 16:40

Talk

The Tolman VII (TVII) solution is considered by some as one of the few analytical solutions to Einstein's equations, which describes approximately well the interior of neutron stars (NSs). This solution is characterized by the mass $M$, radius $R$, and an energy density that varies quadratically with the radial coordinate $r$. Recently, Jiang and Yagi proposed a modification of this solution,...

66. Singularities in general relativity: regular black holes without Cauchy horizon

Jorge Ovalle (Institute of Physics, Silesian University in Opava)

10/10/2022, 17:05

Keynote talk

General relativity predicts the loss of causal structure of spacetime. This is clearly seen with the appearance of singularities in the gravitational collapse (Penrose 65), which when removed lead to the appearance of a Cauchy horizon, a null hyper-surface beyond which predictability breaks down (Poisson-Israel 89). So far no counterexample to the above is known, leading to the belief that...

67. Can Sagittarius A* be a PeVatron of charged particles?

Arman Tursunov (Silesian University in Opava)

10/10/2022, 17:45

Online talk

A compact supermassive source Sagittarius A* located at the centre of our Galaxy has been observed at different wavelengths across the electromagnetic spectrum, being currently the best known black hole candidate. It is also the closest and largest in projection supermassive black hole candidate. At the same time, its particle acceleration capability related cosmic ray and neutrino messengers...