Aspects of electrostatics in a weak gravitational field

Details Aspects of electrostatics in a weak gravitational field Aspects of electrostatics in a weak gravitational field

2009-10-06

arxiv.org/abs/0910.0926v1

Gen.Rel.Grav.42:1153-1181,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

26 pages; accepted for publication in Gen.Rel.Grav

Scientific paper

10.1007/s10714-009-0909-4

Several features of electrostatics of point charged particles in a weak, homogeneous, gravitational field are discussed using the Rindler metric to model the gravitational field. Some previously known results are obtained by simpler and more transparent procedures and are interpreted in an intuitive manner. Specifically: (i) We show that the electrostatic potential of a charge at rest in the Rindler frame is expressible as A_0=(q/l) where l is the affine parameter distance along the null geodesic from the charge to the field point. (ii) We obtain the sum of the electrostatic forces exerted by one charge on another in the Rindler frame and discuss its interpretation. (iii) We show how a purely electrostatic term in the Rindler frame appears as a radiation term in the inertial frame. (In part, this arises because charges at rest in a weak gravitational field possess additional weight due to their electrostatic energy. This weight is proportional to the acceleration and falls inversely with distance -- which are the usual characteristics of a radiation field.) (iv) We also interpret the origin of the radiation reaction term by extending our approach to include a slowly varying acceleration. Many of these results might have possible extensions for the case of electrostatics in an arbitrary static geometry. [Abridged Abstract]

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