Coupling Higher Form Structures of the EFT of Force Free Electrodynamics to Gravity
Abstract
We know that the charged Reissner Nordstrm black hole metric is obtained from the Einstein Hilbert gravitational action. This action has the kinetic term . Motivated by the higher-form symmetry structure of the EFT of Force Free Electrodynamics, we replace the Maxwell field-strength contribution in the Einstein Hilbert action by the gauge-invariant combination , where is the worldsheet gauge field and is a background two-form field. This ensures that the new action has a higher form symmetry . Here, unlike in qed, may be any one form (not necessarily a differential one form ). The higher form symmetry here is one with the conserved current being a two form and the charge integrated on surfaces. Intuitively, it is the number/current of vector field lines that is conserved here, not the current of particles. Thus, integrating over a surface through which the field lines pierce is sufficient to find the number of these lines that are passing through; so the charge is integrated on surfaces, rather than on the volume. After fixing a particular gauge for the fields and , we obtain a generalized black-hole metric. We find that on hypersurfaces satisfying constant, this metric reduces locally to a Reissner Nordstrm geometry with an effective charge parameter depending on the constant .
Cite
@article{arxiv.2605.30098,
title = {Coupling Higher Form Structures of the EFT of Force Free Electrodynamics to Gravity},
author = {Harsh Anand},
journal= {arXiv preprint arXiv:2605.30098},
year = {2026}
}