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Magnetic branes supported by a nonlinear electromagnetic field

S H Hendi

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Considering the nonlinear electromagnetic field coupled to Einstein gravity in the presence of a cosmological constant, we obtain a new class of d-dimensional magnetic brane solutions. This class of solutions yields a spacetime with a longitudinal nonlinear magnetic field generated by a static source. These solutions have no curvature singularity and no horizons but have a conic geometry with a deficit angle δphi. We investigate the effects of nonlinearity on the metric function and deficit angle and also find that for the special range of the nonlinear parameter, the solutions are not asymptotic AdS. We generalize this class of solutions to the case of spinning magnetic solutions and find that when one or more rotation parameters are nonzero, the brane has a net electric charge which is proportional to the magnitude of the rotation parameters. Then, we use the counterterm method and compute the conserved quantities of these spacetimes. Finally, we obtain a constraint on the nonlinear parameter, such that the nonlinear electromagnetic field is conformally invariant.


PACS

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

04.50.-h Higher-dimensional gravity and other theories of gravity

95.30.Sf Relativity and gravitation

MSC

83F05 Cosmology

83C50 Electromagnetic fields

83C05 Einstein's equations (general structure, canonical formalism, Cauchy problems)

85A40 Cosmology (For relativistic cosmology, see 83F05)

81T30 String and superstring theories; other extended objects (e.g., branes) (See also 83E30)

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 22 (21 November 2009)

Received 12 May 2009, in final form 7 September 2009

Published 23 October 2009



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