Surface tension of hot and dense quark matter under strong magnetic fields

G. Lugones and A. G. Grunfeld
Phys. Rev. C 99, 035804 – Published 29 March 2019

Abstract

We study the surface tension of hot, highly magnetized three-flavor quark matter droplets, focusing specifically on the thermodynamic conditions prevailing in neutron stars, hot lepton-rich protoneutron stars, and neutron star mergers. We explore the role of temperature, baryon number density, trapped neutrinos, droplet size, and magnetic fields within the multiple reflection expansion formalism (MRE), assuming that astrophysical quark matter can be described as a mixture of free Fermi gases composed of quarks u, d, s, electrons, and neutrinos, in chemical equilibrium under weak interactions. We find that the total surface tension is rather unaffected by the size of the drop but is quite sensitive to the effect of baryon number density, temperature, trapped neutrinos, and magnetic fields (especially above eB5×103GeV2). Surface tensions parallel and transverse to the magnetic field span values up to 25MeV/fm2. For T100 MeV, the surface tension is a decreasing function of temperature but above 100 MeV it increases monotonically with T. Finally, we discuss some astrophysical consequences of our results.

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  • Received 25 November 2018

DOI:https://doi.org/10.1103/PhysRevC.99.035804

©2019 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

G. Lugones1 and A. G. Grunfeld2,3

  • 1Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida dos Estados 5001, CEP 09210-580, Santo André, São Paulo, Brazil
  • 2CONICET, Rivadavia 1917, (1033) Buenos Aires, Argentina
  • 3Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, (1429) Buenos Aires, Argentina

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Vol. 99, Iss. 3 — March 2019

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