Hyperons in Neutron Stars

Abstract

In this work I briefly review some of the effects of hyperons on the properties of neutron and proto-neutron stars. In particular, I revise the problem of the strong softening of the EoS, and the consequent reduction of the maximum mass, induced by the presence of hyperons, a puzzle which has become more intringuing and difficult to solve due the recent measurements of the unusually high masses of the millisecond pulsars PSR J1903+0327 ($1.667\pm 0.021M_{\odot }$), PSR J1614-2230 ($1.97\pm 0.04M_{\odot }$), and PSR J0348+0432 ($2.01\pm 0.04M_{\odot }$). Some of the solutions proposed to tackle this problem are discussed. Finally, I re-examine also the role of hyperons on the cooling properties of newly born neutron stars and on the so-called r-mode instability.

8 pages, 3 figures. Plenary talk at the 15th International Conference on Strangeness in Quark Matter (SQM2015), 6-11 July 2015, JINR, Dubna, Russia. To be published in Journal of Physics: Conference Series (JPCS)

References in corpus (8)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations
• Hyperon-nucleon interactions - a chiral effective field theory approach
• An Eccentric Binary Millisecond Pulsar in the Galactic Plane
• Estimation of the effect of hyperonic three-body forces on the maximum mass of neutron stars
• Solution of the Hyperon Puzzle within a Relativistic Mean-Field Model
• Effects of $\Lambda$ hyperons on the nuclear equation of state in a Dirac-Brueckner-Hartree-Fock model

Cited by in corpus (16)

• Lambda-nuclear interactions and hyperon puzzle in neutron stars
• Towards Strong Field Tests of Beyond Horndeski Gravity Theories
• Delta baryons and diquark formation in the cores of neutron stars
• Constraining strangeness in dense matter with GW170817
• Hyperon-nuclear interactions from SU(3) chiral effective field theory
• Many-body forces in magnetic neutron stars
• Constraints on the muon fraction and density profile in neutron stars
• Delta baryons in neutron stars
• Exploring the effects of Delta Baryons in magnetars
• Phase transition in compact stars: nucleation mechanism and $\gamma$-ray bursts revisited
• Probing the impact of Delta-Baryons on Nuclear Matter and Non-Radial Oscillations in Neutron Stars
• Kaon condensation in skyrmion matter and compact stars
• Quark-Pauli effects in three octet-baryons
• Impact of QCD sum rules coupling constants on neutron stars structure
• The effect of inclusion of $\Delta$ resonances in relativistic mean-field model with scaled hadron masses and coupling constants
• The Strange Physics of Dark Baryons