A complete decoupling is neither necessary, nor is it feasible in an interacting theory

It suffices if the fields remain effectively decoupled at an early epoch so that the Bunch-Davies conditions can be applied

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astro-ph.CO · 2026-05-21 · unverdicted · novelty 6.0

Coupling dark photons to standard photons enables adequate primordial magnetogenesis without strong-coupling or backreaction issues.

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Dark photon -- Assisted Primordial Magnetogenesis astro-ph.CO · 2026-05-21 · unverdicted · none · ref 20
Coupling dark photons to standard photons enables adequate primordial magnetogenesis without strong-coupling or backreaction issues.