Strangelets and strange quark matter

The hyperon-hyperon potentials due to a recent SU(3) Nijmegen soft-core potential model are incorporated within a relativistic mean field calculation of strange hadronic matter. We find considerably higher binding energy in bulk matter compared to several recent calculations which constrain the composition of matter. For small strangeness fractions (f S < ∼ 1), matter is dominated by N ΛΞ composition and the calculated binding energy closely follows that calculated by using the hyperon potentials of our previous calculations. For larger strangeness fractions (f S > ∼ 1), the calculated binding energy increases substantially beyond any previous calculation due to a phase transition into N ΣΞ dominated matter. We also compare bulk matter calculations with finite system calculations, again highlighting the consequences of reducing the Coulomb destabilizing effects in finite strange systems.

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“…For a recent review of theoretical studies and experimental searches for strangelets, see Refs. [7,8].…”

Section: Introductionmentioning

confidence: 99%

Properties of strange hadronic matter in bulk and in finite systems

2000

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“…= 1 for the down, and N m = 2 for the strange and charm quarks, we have the following thermodynamic potential: (2) ] , so that the flavors are counted as N f = (1 + 1) (1) + (1 + 1) (2) = (u + c) (1) + (d + s) (2) . From this, one can identify the pressure as P = − Ω[N f = 2 + 1 + 1], and compute quark number densities using the standard thermodynamic relation n f = (dP/dµ f ) 8 . We define the total quark number density for charm matter, for a given X, as…”

Section: Charm Mattermentioning

confidence: 99%

Cold quark matter with heavy quarks and the stability of charm stars

Jiménez,

Fraga

2019

Preprint

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We study the effects of heavy quarks on the equation of state for cold and dense quark matter obtained from perturbative QCD, yielding observables parametrized only by the renormalization scale. We investigate the behavior of charm quark matter under the constraints of β-equilibrium and electric charge neutrality in a region of densities where perturbative QCD is in principle much more reliable. We also analyze the stability of charm stars, and find that such quark stars are unstable under radial oscillations.

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“…Charm stars were investigated in the past within the MIT bag model, being ruled out due to instabilities under radial pulsations [20][21][22] (see also Refs. [23,24]). Using our results and the method of first-order coupled oscillation equations of Gondek et al [25], we also find that such quark stars are unstable under radial oscillations.…”

Section: Introductionmentioning

confidence: 99%

Cold quark matter with heavy quarks and the stability of charm stars

Jiménez

Fraga

2020

Phys. Rev. D

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We study the effects of heavy quarks on the equation of state for cold and dense quark matter obtained from perturbative QCD, yielding observables parametrized only by the renormalization scale. We investigate the thermodynamics of charm quark matter under the constraints of β equilibrium and electric charge neutrality in a region of densities where perturbative QCD is, in principle, much more reliable. We also analyze the stability of charm stars, which might be realized as a new branch of ultradense hybrid compact stars, and find that such quark stars are unstable under radial oscillations.

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Strangelets and strange quark matter

Abstract: I summarize the properties of finite lumps of strange quark matter (strangelets) with emphasis on the two scenarios of producing strange matter in relativistic heavy ion collisions. As an outlook, I discuss the possibility of short-lived strange composites and charmed matter.

Cited by 11 publications

References 22 publications

Properties of strange hadronic matter in bulk and in finite systems

Properties of strange hadronic matter in bulk and in finite systems

Cold quark matter with heavy quarks and the stability of charm stars

Cold quark matter with heavy quarks and the stability of charm stars

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