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Exploring the effects of Δ baryons in magnetars

K. D. Marquez, M. R. Pelicer, S. Ghosh, J. Peterson, D. Chatterjee, V. Dexheimer, and D. P. Menezes
Phys. Rev. C 106, 035801 – Published 2 September 2022

Abstract

Strong magnetic fields can modify the microscopic composition of matter with consequences on stellar macroscopic properties. Within this context, we study, for the first time, the possibility of the appearance of spin-3/2 Δ baryons in magnetars. We make use of two different relativistic models for the equation of state of dense matter under the influence of strong magnetic fields considering the effects of Landau levels and the anomalous magnetic moment (AMM) proportional to the spin of all baryons and leptons. In particular, we analyze the effects of the AMM of Δ baryons in dense matter for the first time. We also obtain global properties corresponding to the EoS models numerically and study the corresponding role of the Δ baryons. We find that they are favored over hyperons, which causes an increase in isopin asymmetry and a decrease in spin polarization. We also find that, contrary to what generally occurs when new degrees of freedom are introduced, the Δ's do not make the EoS significantly softer and magnetars less massive. Finally, the magnetic field distribution inside a given star is not affected by the presence of Δ's.

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  • Received 15 June 2022
  • Accepted 20 July 2022

DOI:https://doi.org/10.1103/PhysRevC.106.035801

©2022 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

K. D. Marquez1,*, M. R. Pelicer1, S. Ghosh2, J. Peterson3, D. Chatterjee2, V. Dexheimer3, and D. P. Menezes1

  • 1Departamento de Física, CFM, Universidade Federal de Santa Catarina Florianópolis, CP 476, Santa Catarina 88040-900, Brazil
  • 2Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune University Campus, Pune 411007, India
  • 3Department of Physics, Kent State University, Kent, Ohio 44243, USA

  • *marquezkauan@gmail.com

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Issue

Vol. 106, Iss. 3 — September 2022

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