Spanish and Portuguese Relativity Meeting

Session

Parallel session 9 (Neutron Stars)

Jul 24, 2024, 2:30 PM

Conveners

Parallel session 9 (Neutron Stars)

• Session convener: Violetta Sagun

36. Neutron stars and the cosmological constant problem

Giulia Ventagli

7/24/24, 2:30 PM

Phase transitions can play an important role in the cosmological constant problem, allowing the underlying vacuum energy, and therefore the value of the cosmological constant, to change. Deep within the core of neutron stars, the local pressure may be sufficiently high to trigger the QCD phase transition, thus generating a shift in the value of the cosmological constant. The gravitational...

60. Non-Parametric Constraints on the Neutron Star Equation of State with Multi-messenger Data

Iuliu Cuceu (University of Rome, Tor Vergata)

7/24/24, 2:45 PM

The behaviour of extremely dense cold nuclear matter is still an open question due to intrinsic modelling difficulties of such extreme environments as the hearts of Neutron Stars (NS), but also to the non-trivial connection between the macroscopic observables and microscopic behaviour. In this work, we utilize the now substantial amount of astrophysical data provided by NS observations, along...

15. Hybrid star phenomenology from the properties of the special point

Christoph Gärtlein

7/24/24, 3:00 PM

We study the properties of hybrid stars containing a color superconducting quark matter phase in their cores, which is described by the chirally symmetric formulation of the confining relativistic density functional approach [1]. It is shown that depending on the dimensionless vector and diquark couplings of quark matter, the characteristics of the deconfinement phase transition are varied,...

51. $I$ Love $Q$, but $\delta M$ too

ENEKO ARANGUREN (University of the Basque Country (UPV/EHU))

7/24/24, 3:15 PM

The $I$-Love-$Q$ relations refer to the existence of various approximate equation of state-independent relations involving the moment of inertia, Love number, and quadrupole moment. These relations have an interesting applicability in observational astrophysics since they allow the inference of two quantities within the $I$-Love-$Q$ trio out of a third one alone. However, the quantities...

45. Ridges due to latent heat in rotating neutron stars, in GR and f(R) gravity

Pablo Navarro Moreno

7/24/24, 3:30 PM

We discuss ``ridges'' in macroscopic properties of rotating neutron stars as tell-tale signatures of first order phase transitions in the matter therein. The intensity of the nonanaliticity in the various observables angular momentum/angular frequency/ moment of inertia/ mass/ major and minor radii is proportional to the latent heat in the phase transition, and these signals could be found...

74. Modeling Relativistic Stars within Einstein-Vlasov-Boltzmann Theory

Dr Hannes Rüter (CENTRA, Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa)

7/24/24, 3:45 PM

Relativistic stars are typically modelled as ideal fluids, which in spherical symmetry leads to the Tolman-Oppenheimer-Volkoff (TOV) solutions. In this talk I discuss the construction of solutions for spherical, relativistic stars within full kinetic theory. In this case matter is described by the Vlasov-Boltzmann equation, which allows for a more realistic description of stars that is valid...