Gamma‐Ray Bursts from Delayed Collapse of Neutron Stars to Quark Matter Stars

Berezhiani, Zurab; Bombaci, Ignazio; Drago, A.; Frontera, F.; Lavagno, Andrea

doi:10.1086/367756

Cited by 184 publications

(294 citation statements)

References 43 publications

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“…Alternatively, the hyperon puzzle could be circumvented if neutron stars are hybrid or strange stars. Finally, it could be possible to have in Nature two different families of compact stars [61][62][63], hadronic stars and quark stars and as shown recently [69] the ∆ resenances could play an important role in this scenario.…”

Section: Discussionmentioning

confidence: 92%

“…This huge amount of released energy will cause a powerful neutrino burst, likely accompanied by intense gravitational waves emission, and conceivably it could cause a second delayed (with respect to the supernova explosion) explosion. Under favorable physical conditions this second explosion could be the energy source of a powerful GRB [61,62,65]. Thus this scenario is able to explain a "delayed" connection between supernova explosions and GRBs.…”

Section: Hs Qsmentioning

confidence: 93%

“…NSs in which no fraction of QM is present) is that above a threshold value of their mass, HSs are metastable [61][62][63][64] to the "decay" (conversion) to quark stars (QSs) (i.e. to hybrid stars or to strange stars).…”

Section: Quark Matter In Neutron Stars As a Possible Solution Of The mentioning

confidence: 99%

“…Thus the total energy liberated in the stellar conversion is given by the difference between the critical mass HS (M cr ) and that of the final QS (M f in ) configuration with the same baryonic mass [65]: 2 . It has been shown [61][62][63]65] that E conv = 0.5 -4.0×10 53 erg. This huge amount of released energy will cause a powerful neutrino burst, likely accompanied by intense gravitational waves emission, and conceivably it could cause a second delayed (with respect to the supernova explosion) explosion.…”

Section: Hs Qsmentioning

confidence: 99%

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The Hyperon Puzzle in Neutron Stars

Bombaci

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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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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Section: Discussionmentioning

confidence: 92%

Section: Hs Qsmentioning

confidence: 93%

Section: Quark Matter In Neutron Stars As a Possible Solution Of The mentioning

confidence: 99%

Section: Hs Qsmentioning

confidence: 99%

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The Hyperon Puzzle in Neutron Stars

Bombaci

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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“…In this conference, Bombaci presented a theoretical investigation on the process of strangelet growth in a neutron star [10]. If strangelets are stable at zero pressure, a strangelet in a neutron star will keep growing until the whole star is converted into a gigantic strangelet, or a strange matter star.…”

Section: Gamma-ray Emission (Gre)mentioning

confidence: 99%

Searches for stable strangelets in ordinary matter: overview and a recent example

Müller

O’Connor

et al. 2005

Nuclear Physics A

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Our knowledge on the possible existence in nature of stable exotic particles depends solely upon experimental observation. Guided by this general principle and motivated by theoretical hypotheses on the existence of stable particles of strange quark matter, a variety of experimental searches have been performed. We provide an introduction to the theoretical hypotheses, an overview of the past searches, and a more detailed description of a recent search for helium-like strangelets in the Earth's atmosphere using a sensitive laser spectroscopy method. Is it possible that ordinary nuclear matter that we are familiar with is actually metastable and slowly decaying into quark matter of lower energy? Many hypotheses have been proposed addressing this question. Bodmer first proposed a lower-energy nuclear state, which he called "collapsed nuclei" [1]. Witten investigated the stability of strange quark matter, which consists of approximately equal number of u, d and s quarks in a hadronic state, and reached the intriguing conclusion that it may indeed be stable even at zero external pressure [2]. A particle of strange quark matter is called a "strangelet". Searches for such exotic matter have been performed in astronomical observation, in cosmic rays, in heavy-ion collisions, and in chemical analyses of ordinary matter. Several excellent review articles on this subject are available [3][4][5]. Here we focus on one aspect of the subject: the experimental searches for stable strangelets in ordinary matter. In Section 1, we provide a brief pedagogical introduction to strange quark matter and strangelets; in Section 2, we review the past searches; in Section 3, we present our recent search for helium-like strangelets in the Earth's atmosphere.

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The equation of state of dense matter: Stiff, soft, or both?

2019

Self Cite

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We review the constraints on the equation of state (EoS) of dense matter that have been obtained with the detection of GW170817 and its electromagnetic counterparts. While extremely stiff EoSs are ruled out by the gravitational wave signal, also extremely soft EoSs seem disfavored because they are unable to provide massive enough accretion disks. In this respect, the two-families scenario, in which hadronic stars (HSs) and quark stars (QSs) coexist, could offer a viable solution: the hadronic matter EoS is very soft and leads to very small radii, whereas the quark matter EoS is stiff and leads to large masses. In this scenario, GW170817 could be interpreted as due to the merger of an HS and a QS. We present a parametric study of the two-families scenario in which the quark matter EoS is computed by a constant-speed-of-sound (c s ) model and study the astrophysical constraints on the free parameters of the model. For this study, we fix c 2 s = 1∕3, which holds true at asymptotically high densities (the conformal limit). If quark matter is absolutely stable, its baryon density at zero pressure must be smaller than twice the nuclear saturation density and its energy per baryon is a few tens of MeV smaller than that of iron.

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Gamma‐Ray Bursts from Delayed Collapse of Neutron Stars to Quark Matter Stars

Cited by 184 publications

References 43 publications

The Hyperon Puzzle in Neutron Stars

The Hyperon Puzzle in Neutron Stars

Searches for stable strangelets in ordinary matter: overview and a recent example

The equation of state of dense matter: Stiff, soft, or both?

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