@Article{PereiraCoelLima:2018:LaThCl,
author = "Pereira, Jonas P. and Coelho, Jaziel Goulart and Lima, Rafael C.
R. de",
affiliation = "{Universidade Federal do ABC (UFABC)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Universidade do Estado de Santa
Catarina (UDESC)}",
title = "Born–Infeld magnetars: larger than classical toroidal magnetic
fields and implications for gravitational-wave astronomy",
journal = "European Physical Journal C",
year = "2018",
volume = "78",
number = "5",
pages = "e361",
month = "May",
abstract = "Magnetars are neutron stars presenting bursts and outbursts of X-
and soft-gamma rays that can be understood with the presence of
very large magnetic fields. In this setting, nonlinear
electrodynamics should be taken into account for a more accurate
description of such compact systems. We study that in the context
of ideal magnetohydrodynamics and make a realization of our
analysis to the case of the well known Born-Infeld (BI)
electromagnetism in order to come up with some of its
astrophysical consequences. We focus here on toroidal magnetic
fields as motivated by already known magnetars with low dipolar
magnetic fields and their expected relevance in highly magnetized
stars. We show that BI electrodynamics leads to larger toroidal
magnetic fields when compared to Maxwell's electrodynamics. Hence,
one should expect higher production of gravitational waves (GWs)
and even more energetic giant flares from nonlinear stars. Given
current constraints on BI's scale field, giant flare energetics
and magnetic fields in magnetars, we also find that the maximum
magnitude of magnetar ellipticities should be 10(-6)-10(-5) .
Besides, BI electrodynamics may lead to a maximum increase of
order 10-20% of the GW energy radiated from a magnetar when
compared to Maxwell's, while much larger percentages may arise for
other physically motivated scenarios. Thus, nonlinear theories of
the electromagnetism might also be probed in the near future with
the improvement of GW detectors.",
doi = "10.1140/epjc/s10052-018-5849-2",
url = "http://dx.doi.org/10.1140/epjc/s10052-018-5849-2",
issn = "1434-6044",
language = "en",
targetfile = "pereira_born.pdf",
urlaccessdate = "27 abr. 2024"
}