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Title: Neutron stars in a perturbative f(R) gravity model with strong magnetic fields

In Kaluza-Klein electromagnetism it is natural to associate modified gravity with strong electromagnetic fields. Hence, in this paper we investigate the combined effects of a strong magnetic field and perturbative f(R) gravity on the structure of neutron stars. The effect of an interior strong magnetic field of about 10{sup 17−18} G on the equation of state is derived in the context of a quantum hadrodynamics (QHD) equation of state (EoS) including effects of the magnetic pressure and energy along with occupied Landau levels. Adopting a random orientation of interior field domains, we solve the modified spherically symmetric hydrostatic equilibrium equations derived for a gravity model with f(R) = R+αR{sup 2}. Effects of both the finite magnetic field and the modified gravity are detailed for various values of the magnetic field and the perturbation parameter α along with a discussion of their physical implications. We show that there exists a parameter space of the modified gravity and the magnetic field strength, in which even a soft equation of state can accommodate a large ( > 2 M{sub s}un) maximum neutron star mass.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Physics, Soongsil University, Seoul 156-743 (Korea, Republic of)
  2. Department of Physics, Mimar Sinan Fine Arts University, Bomonti 34380, Istanbul (Turkey)
  3. İstanbul Technical University, Faculty of Science and Letters, Physics Engineering Department, Maslak 34469, Istanbul (Turkey)
  4. General Education Curriculum Center, Hanyang University, Seoul 133-791 (Korea, Republic of)
  5. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
  6. Center for Astrophysics, Department of Physics, University of Notre Dame, IN 46556 (United States)
Publication Date:
OSTI Identifier:
22282633
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; ELECTROMAGNETIC FIELDS; ELECTROMAGNETISM; EQUATIONS OF STATE; EQUILIBRIUM; GRAVITATION; KALUZA-KLEIN THEORY; MAGNETIC FIELDS; MASS; NEUTRON STARS; ORIENTATION; PERTURBATION THEORY; RANDOMNESS; SPACE; SYMMETRY