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hep-th2026
The Infraparticle Edge
Soo-Jong Rey
I derive the charged-particle spectral edge from the quantum instrument of soft QED. I use two projections of that instrument. Tracing over unresolved photons gives the reduced har…
hep-th2026
Horizon-Restricted Leading Soft QED as Open Quantum System
Soo-Jong Rey
I formulate black-hole-horizon-induced decoherence of charged branch codes as the leading-soft QED restricted to an exterior algebra, formulated as an open quantum system. The fixe…
hep-th2026
Soft QED as Open Quantum System: Infrared Cancellation and Soft-Shell Coarse Graining
Soo-Jong Rey
I formulate unresolved soft-photon sector of QED as open quantum system. Resolved charged particles and hard photons form the system, unresolved soft photons form the environment,…