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  • Letter
  • Open Access

Axion effects in the stability of hybrid stars

Bruno S. Lopes1, Ricardo L. S. Farias1,*, Veronica Dexheimer2, Aritra Bandyopadhyay3,4, and Rudnei O. Ramos5

  • 1Departamento de Física, Universidade Federal de Santa Maria, Santa Maria, RS 97105-900, Brazil
  • 2Department of Physics, Kent State University, Kent, Ohio 44242, USA
  • 3Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
  • 4Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
  • 5Departamento de Física Teórica, Universidade do Estado do Rio de Janeiro, 20550-013 Rio de Janeiro, Rio de Janeiro, Brazil

  • *ricardo.farias@ufsm.br
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Phys. Rev. D 106, L121301 – Published 21 December, 2022

DOI: https://doi.org/10.1103/PhysRevD.106.L121301

Abstract

We investigate the effects of including strong CP violating effects through axion fields in the microscopic equation of state of massive hybrid neutron stars. We assume that their cores contain deconfined quark matter and include the effects of axions via an effective ‘t Hooft determinant interaction. The hadronic crusts are described using different approaches in order to make our results more general. We find that the presence of axions stabilizes massive hybrid neutron stars against gravitational collapse by weakening the deconfinement phase transition and bringing it to lower densities. This enables to reproduce hybrid neutron stars in agreement with modern astrophysical constraints.

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Phys. Rev. D 106, L121301– Published 21 December, 2022
  • Received 14 June 2022
  • Accepted 17 October 2022
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