Lsz bridge unitarity
v278_lsz_bridge_unitarity.py · registry
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QFT4D.SPERT.04 — the S_pert → S_phys LSZ bridge + one-loop unitarity: connects the EG perturbative S-matrix (v269/v271/v273) to the physical asymptotic S-matrix (S_phys = LSZ on the OS Wightman functions, v240). [E] LSZ bridge: S_phys = amputate+on-shell-residue of the connected time-ordered products, and the EG T-products of S_pert ARE those correlators (OS Wick-rotation, v240) → S_pert --LSZ--> S_phys; [C] the gap Δ=6log(3/2)>0 gives Haag-Ruelle asymptotic states so LSZ is valid; [E] ONE-LOOP UNITARITY (optical theorem): the bubble discontinuity Im B(s)/π = x₊−x₋ = √(1−4m²/s) EXACTLY = the two-body phase space, so 2 Im M = ∑∫dΠ|M|² (cutting rule) holds → matter+gauge unitary; [E] threshold: Im B=0 below s=4m², turns on at the physical 2-particle threshold; [O] gravity caveat — the Stelle ghost makes the gravity perturbative S-matrix non-unitary → QG.AMB.01; [C] finite field-strength Z from the EG scheme. Connects S_pert to S_phys and verifies one-loop unitarity for matter+gauge.
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