Bw geometric modular
v323_bw_geometric_modular.py · frontier
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The keystone pushed one step: Bisognano-Wichmann makes the seam modular flow GEOMETRIC, so the mu4 deck invariance is not an independent axiom. The clock rho=diag(i^n)=exp(i(pi/2)L) is a geometric rotation (L=diag(n) the rotation generator, rho^4=I, mu4 in U(1)_rot). For a rotation-covariant covariance C=f(L) the modular Hamiltonian K=log((1-C)/C)=g(L), so [K,L]=0 (the modular flow commutes with all rotations) and [rho,K]=[rho,C]=0 -- the clock is a modular symmetry for free. Discriminator vs v309: a period-4 curvature preserves the clock but its modular flow is NOT geometric ([K,L]!=0); BW is strictly stronger. Linked bedrock: GIVEN the seam is the (E8)_1 chiral net (v308), BW/Hislop-Longo make the vacuum modular flow geometric => QGEO.SYM.01 (omega o rho=omega) is downstream of SEAM.EQUIV.01 + a rotation-invariant vacuum. Residual: the raw collar vacuum is rotation-invariant (cleaner than v309, shared with v308)
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