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

Abstract

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 $\beta$ 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.

arXiv comment8 pages, 6 figures; v2: figure added, references added, modifications to the text and figures

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Cited by in corpus (5)

• Cool quark matter with perturbative quark masses
• Magnetic moments of the octet, decuplet, low-lying charm, and low-lying bottom baryons in a nuclear medium
• Interacting quark matter effects on the structure of compact stars
• Heavy-quark effects on cold quark matter and self-bound stars
• Charged charm stars