TL;DR
This paper reviews the hyperon puzzle in neutron stars, exploring solutions involving hyperonic interactions and deconfined strange quark matter, and discusses the astrophysical implications of potential star conversions.
Contribution
It provides a comprehensive overview of the hyperon puzzle, evaluates proposed solutions, and examines the role of quark matter in neutron star physics.
Findings
Hyperonic interactions significantly affect the neutron star equation of state.
Deconfined strange quark matter offers a possible solution to the hyperon puzzle.
Conversion of hadronic stars to quark stars has notable astrophysical consequences.
Abstract
The so called "hyperon puzzle", i.e. the difficulty to reconcile the measured masses of neutron stars (NSs) with the presence of hyperons in their interiors, is one of the hot topics in astrophysics which is stimulating copious experimental and theoretical research in hypernuclear physics. After illustrating the origin of the hyperon puzzle, I discuss some of its possible solutions, and particularly those related to the role of hyperonic two- and three-body interactions on the equation of state of dense matter. Afterward, I discuss a possibility to circumvent the hyperon puzzle allowing for the presence of strangeness in NSs in the form of deconfined strange quark matter, and thus considering the so called quark stars, i.e. hybrid stars or strange stars. Finally I discuss the astrophysical consequences of the possible conversion process of an hadronic star to a quark star.
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