Jul 17 – 19, 2024
Lanzhou
Asia/Hong_Kong timezone

Radial Oscillations in Hybrid Stars: Investigating Slow Quark Phase Transition

Not scheduled
25m
Lanzhou

Lanzhou

Oral presentation

Speaker

Dr. ISHFAQ AHMAD RATHER (Institute for Theoretical Physics, Goethe University, 60438 Frankfurt am Main, Germany)

Description

This study delves into the radial oscillations of hybrid neutron stars, which possess a unique structure comprising hadronic external layers and a quark matter core. Using a density-dependent relativistic mean-field model incorporating hyperons and $\Delta$ baryons to describe hadronic matter, along with a density-dependent quark model for quark matter, we explore the ten lowest eigenfrequencies and their corresponding oscillation functions. Our investigation centers on neutron stars with equations-of-state involving N, N+$\Delta$, N+H, and N+H+$\Delta$, featuring a phase transition to quark matter.

A key focus is on the effects of a slow phase transition at the hadron-quark interface. We observe that the maximum mass is reached before the fundamental mode's frequency decreases for slow phase transitions. This observation suggests the stability of stellar configurations with higher central densities than the maximum mass, termed Slow Stable Hybrid Stars (SSHSs), even under minor radial perturbations. The length of these SSHS branches depends on the energy density jump between the two phases and the stiffness of the quark EoS.

References:
1. Radial Oscillations of Hybrid Stars and Neutron Stars including Delta baryons: The Effect of a Slow Quark Phase Transition, arXiv:2401.07789v2 (2024).

Primary author

Dr. ISHFAQ AHMAD RATHER (Institute for Theoretical Physics, Goethe University, 60438 Frankfurt am Main, Germany)

Co-authors

Kauan Marquez (Universidade de Coimbra) Ms Betânia C. Backes (School of Physics, Engineering and Technology, University of York, YO10-5DD York, United Kingdom) Grigorios Panotopoulos (CENTRA, IST) Ilídio Pereira Lopes (CENTRA-IST)

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