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Hybrid electrostatic waves in linearized gravity

Published online by Cambridge University Press:  29 April 2024

Chinmoy Bhattacharjee Open the ORCID record for Chinmoy Bhattacharjee [Opens in a new window]  and
David J. Stark Open the ORCID record for David J. Stark [Opens in a new window]
Chinmoy Bhattacharjee*
Affiliation:
Department of Physics, New York Institute of Technology, Old Westbury, NY 11568, USA
David J. Stark
Affiliation:
Plasma Theory and Applications, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Department of Physics, College of William & Mary, Williamsburg, VA 23185, USA
*
†Email address for correspondence: usa.chinmoy@gmail.com
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Abstract

Linearized gravity around a rotating black hole or compact object introduces the concept of a gravitomagnetic field, which originates from the matter–current in the rotating object. Plasma in proximity to this object is subsequently subjected to motion guided by this gravitomagnetic term (where mass serves as the effective charge) in addition to the conventional magnetic field. Such an interplay of fields complicates the accessible plasma waves of the system and thus merits exploration to delineate this interplay, to identify any observable signatures of the gravitomagnetic field in weakly magnetized systems, and to motivate future numerical work in a fully relativistic setting where the effects may be stronger. In this work we analyse the dispersion of the upper and lower hybrid electrostatic waves in a plasma immersed in both magnetic and gravitomagnetic fields. In particular, we discuss the effective augmentation or cancellation of the two fields under the right conditions for the upper hybrid wave. In contrast, the lower hybrid wave experiences a frequency up-shift from the gravitomagnetic field regardless of whether it is parallel or antiparallel to the magnetic field for the studied field strengths.

Keywords

astrophysical plasmasplasma wavesplasma dynamics
Type
Letter
Information
Journal of Plasma Physics , Volume 90 , Issue 2 , April 2024 , 175900201
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Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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