Neutron stars in a perturbative f(R) gravity model with strong magnetic fields
Abstract
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:
-
- Department of Physics, Soongsil University, Seoul 156-743 (Korea, Republic of)
- Department of Physics, Mimar Sinan Fine Arts University, Bomonti 34380, Istanbul (Turkey)
- İstanbul Technical University, Faculty of Science and Letters, Physics Engineering Department, Maslak 34469, Istanbul (Turkey)
- General Education Curriculum Center, Hanyang University, Seoul 133-791 (Korea, Republic of)
- National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
- Publication Date:
- OSTI Identifier:
- 22282633
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2013; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
- 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
Citation Formats
Cheoun, Myung-Ki, Deliduman, Cemsinan, Güngör, Can, Keleş, Vildan, Ryu, C. Y., Kajino, Toshitaka, and Mathews, Grant J., E-mail: cheoun@ssu.ac.kr, E-mail: cemsinan@msgsu.edu.tr, E-mail: gungorcan@itu.edu.tr, E-mail: kelesvi@itu.edu.tr, E-mail: kaon1212@hanmail.net, E-mail: kajino@nao.ac.jp, E-mail: gmathews@nd.edu. Neutron stars in a perturbative f(R) gravity model with strong magnetic fields. United States: N. p., 2013.
Web. doi:10.1088/1475-7516/2013/10/021.
Cheoun, Myung-Ki, Deliduman, Cemsinan, Güngör, Can, Keleş, Vildan, Ryu, C. Y., Kajino, Toshitaka, & Mathews, Grant J., E-mail: cheoun@ssu.ac.kr, E-mail: cemsinan@msgsu.edu.tr, E-mail: gungorcan@itu.edu.tr, E-mail: kelesvi@itu.edu.tr, E-mail: kaon1212@hanmail.net, E-mail: kajino@nao.ac.jp, E-mail: gmathews@nd.edu. Neutron stars in a perturbative f(R) gravity model with strong magnetic fields. United States. https://doi.org/10.1088/1475-7516/2013/10/021
Cheoun, Myung-Ki, Deliduman, Cemsinan, Güngör, Can, Keleş, Vildan, Ryu, C. Y., Kajino, Toshitaka, and Mathews, Grant J., E-mail: cheoun@ssu.ac.kr, E-mail: cemsinan@msgsu.edu.tr, E-mail: gungorcan@itu.edu.tr, E-mail: kelesvi@itu.edu.tr, E-mail: kaon1212@hanmail.net, E-mail: kajino@nao.ac.jp, E-mail: gmathews@nd.edu. 2013.
"Neutron stars in a perturbative f(R) gravity model with strong magnetic fields". United States. https://doi.org/10.1088/1475-7516/2013/10/021.
@article{osti_22282633,
title = {Neutron stars in a perturbative f(R) gravity model with strong magnetic fields},
author = {Cheoun, Myung-Ki and Deliduman, Cemsinan and Güngör, Can and Keleş, Vildan and Ryu, C. Y. and Kajino, Toshitaka and Mathews, Grant J., E-mail: cheoun@ssu.ac.kr, E-mail: cemsinan@msgsu.edu.tr, E-mail: gungorcan@itu.edu.tr, E-mail: kelesvi@itu.edu.tr, E-mail: kaon1212@hanmail.net, E-mail: kajino@nao.ac.jp, E-mail: gmathews@nd.edu},
abstractNote = {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.},
doi = {10.1088/1475-7516/2013/10/021},
url = {https://www.osti.gov/biblio/22282633},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2013,
place = {United States},
year = {Tue Oct 01 00:00:00 EDT 2013},
month = {Tue Oct 01 00:00:00 EDT 2013}
}