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arXiv · 2606.13064

Exact Relevant Stress-Tensor Flows and a Causality No-Go in Self-Dual Electrodynamics

H. Babaei-Aghbolagh·Bin Chen·Song He·Jue Hou
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Abstract

Can a classically relevant stress-tensor deformation be exactly solvable, duality preserving, and physically causal? We construct an exact power-law family of nonlinear electrodynamics preserving electromagnetic duality, together with a parallel two-dimensional Lax-integrable realization. Its auxiliary geometry yields the full characteristic-cone phase diagram and a universal finite-energy fold. For the Maxwell seed, every nonzero relevant branch is acausal, whereas every causal branch is caustic-free; undeformed Maxwell theory is the only causal point in the relevant regime.

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H. Babaei-Aghbolagh, Bin Chen, Song He, Jue Hou. 2026-06-11. Exact Relevant Stress-Tensor Flows and a Causality No-Go in Self-Dual Electrodynamics. https://arxiv.org/abs/2606.13064

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