Neutron star matter with Δ isobars in a relativistic quark model

Sahoo, Himanshu S.; Mitra, Gautam; Mishra, Rabindranath; Panda, Prafulla K.; Li, Bao-An

doi:10.1103/physrevc.98.045801

Title: Neutron star matter with Δ isobars in a relativistic quark model

Journal Article · Wed Oct 03 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.98.045801· OSTI ID:1612024

Sahoo, Himanshu S. ^[1]; Mitra, Gautam ^[1]; Mishra, Rabindranath ^[1]; Panda, Prafulla K. ^[2]; Li, Bao-An ^[3]

Ravenshaw Univ., Cuttack (India)
Utkal Univ., Bhubaneswar (India)
Texas A & M Univ., Commerce, TX (United States)

The possibility of the appearance of Δ(1232) isobars in neutron star matter and the so-called Δ puzzle is investigated in a relativistic quark model where the confining interaction for quarks inside a baryon is represented by a phenomenological average potential in an equally mixed scalar-vector harmonic form. The hadron-hadron interaction in nuclear matter is then realized by introducing additional quark couplings to σ, ω, and ρ mesons through mean-field approximations. The hyperon couplings are fixed from the hyperon optical potentials at saturation density. Effects of moderate variations in the Δ–ω and Δ–ρ coupling strengths on the critical density of forming Δ resonances and on the mass-radius relation of neutron stars is studied. Furthermore, we have also made an attempt to study the impact of in-medium mass variations of the Δ baryon on the structure of neutron stars. It is observed that, within the constraints of the masses of the precisely measured massive pulsars PSR J0348+0432 and PSR J1614–2230, neutron stars with a composition of both Δ isobars and hyperons are possible in the present model.

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Research Organization:: Texas A & M Univ., Commerce, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0013702

OSTI ID:: 1612024

Alternate ID(s):: OSTI ID: 1475475

Journal Information:: Physical Review C, Vol. 98, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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