Strange matter prospects within the string-flip model

Bastian, Niels-Uwe F.; Blaschke, D.; Cierniak, Mateusz; Fischer, Tobias; Kaltenborn, Mark Alexander; Marczenko, Michał; Typel, S.

doi:10.1051/epjconf/201817120002

Cited by 6 publications

(7 citation statements)

References 27 publications

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“…Interesting new aspects, which are expected from this approach concern, for instance, the Pauli blocking between baryons, including hyperons, in dense matter. This shall be of relevance for the discussion of the hyperon puzzle in compact stars [29,30].…”

Section: Quark Pauli Blocking In Hadronic Mattermentioning

confidence: 87%

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Towards a Unified Quark-Hadron-Matter Equation of State for Applications in Astrophysics and Heavy-Ion Collisions

et al. 2018

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Abstract:We outline an approach to a unified equation of state for quark-hadron matter on the basis of a Φ−derivable approach to the generalized Beth-Uhlenbeck equation of state for a cluster decomposition of thermodynamic quantities like the density. To this end we summarize the cluster virial expansion for nuclear matter and demonstrate the equivalence of the Green's function approach and the Φ−derivable formulation. As an example, the formation and dissociation of deuterons in nuclear matter is discussed. We formulate the cluster Φ−derivable approach to quark-hadron matter which allows to take into account the specifics of chiral symmetry restoration and deconfinement in triggering the Mott-dissociation of hadrons. This approach unifies the description of a strongly coupled quark-gluon plasma with that of a medium-modified hadron resonance gas description which are contained as limiting cases. The developed formalism shall replace the common two-phase approach to the description of the deconfinement and chiral phase transition that requires a phase transition construction between separately developed equations of state for hadronic and quark matter phases. Applications to the phenomenology of heavy-ion collisions and astrophysics are outlined.

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Section: Quark Pauli Blocking In Hadronic Mattermentioning

confidence: 87%

“…i+j and using Equation (30). Since these two equivalent expressions in Equation (31) are at the same time equivalent to the two-cluster irreducible Φ functional introduced above in Equations (20) and Figure 5, the functional relations…”

Section: φ-Derivable Approach To the Cluster Virial Expansion For Nucmentioning

confidence: 95%

Towards a Unified Quark-Hadron-Matter Equation of State for Applications in Astrophysics and Heavy-Ion Collisions

et al. 2018

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“…two neutron star families with similar masses but very different radii [30,31]. If members of both families could be observed, this would be a strong indicator for a first order QCD-like phase transition where (the smaller) neutron stars can carry a core made of strange matter [32].…”

Section: Strange Quark Matter In Neutron Star Coresmentioning

confidence: 99%

Strange matter in compact stars

Klähn

Blaschke

2018

EPJ Web Conf.

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Abstract. We discuss possible scenarios for the existence of strange matter in compact stars. The appearance of hyperons leads to a hyperon puzzle in ab-initio approaches based on effective baryon-baryon potentials but is not a severe problem in relativistic mean field models. In general, the puzzle can be resolved in a natural way if hadronic matter gets stiffened at supersaturation densities, an effect based on the quark Pauli quenching between hadrons. We explain the conflict between the necessity to implement dynamical chiral symmetry breaking into a model description and the conditions for the appearance of absolutely stable strange quark matter that require both, approximately masslessness of quarks and a mechanism of confinement. The role of strangeness in compact stars (hadronic or quark matter realizations) remains unsettled. It is not excluded that strangeness plays no role in compact stars at all. To answer the question whether the case of absolutely stable strange quark matter can be excluded on theoretical grounds requires an understanding of dense matter that we have not yet reached.

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“…The model for confinement is motivated by the string-flip model (SFM) [31], and already achieved great success in the studies of astrophysical phenomena [23,[32][33][34]. In this work, we restrict ourselves to only the important interactions in order to demonstrate the effect of deconfinement and Mott dissociation…”

Section: Quarksmentioning

confidence: 99%

A unified quark-nuclear matter equation of state from the cluster virial expansion within the generalized Beth–Uhlenbeck approach

Bastian

Blaschke

2021

Eur. Phys. J. A

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We consider a cluster expansion for strongly correlated quark matter where the clusters are baryons with spectral properties that are described within the generalized Beth–Uhlenbeck approach by a medium dependent phase shift. We employ a simple ansatz for the phase shift which describes an on-shell bound state with an effective mass and models the continuum by an anti-bound state located at the mass of the three-quark continuum threshold, so that the Levinson theorem is fulfilled by construction. The quark and baryon interactions are accounted for by the coupling to scalar and vector meson mean fields modelled by density functionals. At increasing density and temperature, due to the different medium-dependence of quark and baryon masses, the Mott dissociation of baryons occurs and its contributions to the thermodynamics vanish. It is demonstrated on this simple example that this unified approach to quark-hadron matter is capable of describing crossover as well as first order phase transition behaviour in the phase diagram with a critical endpoint. Changing the meson mean field, the case of a “crossover all over” in the phase diagram is also obtained.

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Strange matter prospects within the string-flip model

Abstract: Abstract. In this contribution we extend the recently developed two-flavor quark-matter string-flip model by including strange quarks. We discuss implications for compact stars.

Cited by 6 publications

References 27 publications

Towards a Unified Quark-Hadron-Matter Equation of State for Applications in Astrophysics and Heavy-Ion Collisions

Towards a Unified Quark-Hadron-Matter Equation of State for Applications in Astrophysics and Heavy-Ion Collisions

Strange matter in compact stars

A unified quark-nuclear matter equation of state from the cluster virial expansion within the generalized Beth–Uhlenbeck approach

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