19th International Conference on QCD in Extreme Conditions (XQCD 2023)

Neutron star radial oscillations with Delta Baryons

26 Jul 2023, 14:25

25m

Auditorium C.1 (Department of Physics (University of Coimbra))

Talk Parallel session A

Speaker

Dr Ishfaq Ahmad Rather (Centro de Astrofisica e Gravitacao-CENTRA, Instituto Superior Tecnico-IST, Universidade de Lisboa-UL, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

Description

Employing the density-dependent relativistic mean-field model, we investigate the effect of delta baryons on the radial oscillations of neutron and hyperon stars. A unified approach is employed to calculate the baryon-meson coupling constants for the spin-1/2 baryonic octet and the spin-3/2 decuplet. By solving the Sturm-Liouville boundary value problem and verifying its validity, we calculate the 20 lowest eigenfrequencies and related oscillation functions of delta-admixed nuclear (N$\Delta$) and hyperonic matter (NH$\Delta$).
We see that the presence of the delta and hyperonic admixtures causes the lowest mode frequencies for N+$\Delta$ and N+H EoSs to be higher than those for the pure nucleonic matter [1]. With the inclusion of hyperons and $\Delta$s, the distance between succeeding modes also increases.

References

1. Ishfaq A. Rather, K. D. Marquez, G. Panotopoulos, I. Lopes, arXiv preprint arXiv:2303.11006 (2023).

Presentation materials

Ishfaq.pdf