Second Holography and Dense Matter Workshop (featuring Meeting of Compact Objects working group of the GW GdR)

Session

Compact Objects WG (GdR on Gravitational Waves)

17 sept. 2025, 10:00

APC Laboratory (Paris)

13. Pairing beyond BCS

Michael Urban

17/09/2025 10:00

Neutron pairing and superfluidity have important consequences for pulsar glitches and neutron star cooling and have been studied for decades. Nevertheless, the density dependence of the pairing gap and of the critical temperature are still a matter of debate, mostly because of medium polarization (screening) effects. After a brief review of recent quantum Monte-Carlo results and screening...

14. Superfluid fraction in the inner crust of neutron stars

Giorgio Almirante

17/09/2025 10:40

The question of whether there are enough superfluid neutrons in the inner crust of neutron stars to explain pulsar glitches remains a topic of debate. Previous band structure calculations suggest that the entrainment effect significantly reduces the superfluid density. In this talk, HFB calculations are presented and a new derivation of the BCS expression for the superfluid density is given....

15. Bayesian Inferences of Neutron Stars' Properties: When Astro and Nuclear physics go hand in hand

Gabriele Montefusco

17/09/2025 11:30

Understanding the equation of state (EoS) of dense matter is crucial in simulations of neutron star structure and dynamics, as well as for the interpretation of astrophysical data. In particular, the EoS of cold neutron stars defines their stationary structure, from their masses and radii to their tidal deformabilities and the oscillation spectra of their normal modes. However, a...

16. Simulations of rotating neutron star oscillations with Roxas

Gaël Servignat

17/09/2025 14:00

Relativistic hydrodynamics has undergone major development over the past three decades, notably through high-resolution shock-capturing schemes enabled by conservative formulations of the relativistic fluid equations.
Simultaneously, advances in Numerical Relativity have allowed fully relativistic simulations of compact binary systems, particularly binary neutron stars, up to merger.
The...

12. Muonic opacities in (hot) dense matter

Micaela Oertel

17/09/2025 14:40

Neutrinos play an important role in compact star
astrophysics: neutrino-heating is one of the main ingredients in
core-collapse supernovae, neutrino-matter interactions determine the
composition of matter in binary neutron star mergers and have among
others a strong impact on conditions for heavy element nucleosynthesis
and neutron star cooling is dominated by neutrino emission except...