Homehep-tharXiv:2605.30098

Coupling Higher Form Structures of the EFT of Force Free Electrodynamics to Gravity

hep-th2026-05v1license

Abstract

We know that the charged Reissner Nordstro¨\"{o}m black hole metric is obtained from the Einstein Hilbert gravitational action. This action has the kinetic term F2=(da)2F^2 = (da)^2. 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 (bda)2(b-da)^2, where aμa_\mu is the worldsheet gauge field and bμνb_{\mu\nu} is a background two-form field. This ensures that the new action has a higher form symmetry bb+dΛ,aa+Λb \rightarrow b+d\Lambda, a\rightarrow a+\Lambda. Here, unlike in qed, Λ\Lambda may be any one form (not necessarily a differential one form μϕ\partial_\mu \phi). 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 aμa_\mu and bμνb_{\mu\nu}, we obtain a generalized black-hole metric. We find that on hypersurfaces satisfying (rt)=(r-t)= constant, this metric reduces locally to a Reissner Nordstro¨\"om geometry with an effective charge parameter depending on the constant (rt)(r-t).

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}
}