Conveners
Parallel session 25: QCD matter in astrophysics
- Eero Aleksi Kurkela
Multimessenger signals from binary neutron star (BNS) mergers are promising tools to infer the largely unknown properties of nuclear matter at densities that are presently inaccessible to laboratory experiments.
The gravitational waves (GWs) emitted by BNS merger remnants, in particular, have the potential of setting tight constraints on the neutron-star equation of state (EOS).
In this talk...
Completing the perturbative four-loop pressure of cold quark matter (QM) has been shown to significantly constrain the neutron-star-matter equation of state. Building on the milestone results in [1, 2], where all screened gluonic contributions to the QM pressure at this order were computed, the remaining challenge lies in evaluating the missing hard contributions arising from four-loop QCD...
We generalize the relativistic magnetohydrodynamic (MHD) theory recently derived in Ref. [1] to describe the dissipative dynamics occurring in accretion disks in presence of large magnetic fields. For this purpose we consider a relativistic dilute gas composed of electrons and ions described by the Boltzmann-Vlasov equation and simplify it using the 14-moment approximation. This procedure...
We demonstrate that astrophysical constraints on the dense-matter equation of state place an upper bound on the color-superconducting gap in dense matter above the transition from nuclear matter to quark matter. Pairing effects in the color-flavor locked (CFL) quark matter phase increase the pressure at high density, and if this effect is sufficiently large then the requirements of causality...
We investigate the validity of the $\Lambda$ single-particle potential ($\Lambda$ potential) in dense matter that is based on chiral effective field theory (chiral EFT) that is sufficiently repulsive to solve the hyperon puzzle of neutron stars. We discuss that the model calculations with the $\Lambda$ potential are consistent with the $\Lambda$ hypernuclear spectroscopy [1] and the $\Lambda$...
Intermediate to low energy heavy-ion collisions are sensitive to the finite temperature ($T$), high baryon number density ($n_B$) QCD equation of state (EoS) at a ratio between charged and total number of baryons that is fixed by the colliding species. For typical nuclei used in collisions, like gold and lead, this ratio, also known as the charge fraction ($Y^{\rm QCD}_Q$), is around 0.4. On...
We investigate the weak-interaction-driven bulk-viscous transport properties of npe matter in the neutrino transparent regime. This work complements our recent study that shows that the dynamics of neutron star mergers away from beta equilibrium can be precisely described by an Israel-Stewart formulation with far-from-equilibrium bulk and relaxation time transport coefficients, which are...
