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Towards traversable wormholes from force-free plasmas

Iqbal, Nabil and Ross, Simon F. (2022) 'Towards traversable wormholes from force-free plasmas.', SciPost physics., 12 (3). 086.


The near-horizon region of magnetically charged black holes can have very strong magnetic fields. A useful low-energy effective theory for fluctuations of the fields, coupled to electrically charged particles, is force-free electrodynamics. The low energy collective excitations include a large number of Alfven wave modes, which have a massless dispersion relation along the field worldlines. We attempt to construct traversable wormhole solutions using the negative Casimir energy of the Alfven wave modes, analogously to the recent construction using charged massless fermions. The behaviour of massless scalars in the near-horizon region implies that the size of the wormholes is strongly restricted and cannot be made large, even though the force free description is valid in a larger regime.

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Publisher statement:Copyright N. Iqbal and S. F. Ross This work is licensed under the Creative Commons Attribution 4.0 International License. Published by the SciPost Foundation
Date accepted:04 February 2022
Date deposited:22 April 2022
Date of first online publication:09 March 2022
Date first made open access:22 April 2022

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