Celestial z4 orbifold
v492_celestial_z4_orbifold.py · frontier
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CELEST.WP1.01: WP1 of the celestial-holographic research contract CELEST.SEAM.01 -- the E8 mu4-glue grading (v128) IS the flat Z4 monodromy of the glue-equivariant celestial chiral algebra on the A3 ALE space C^2/Z4 (Bittleston-Homans-Sharma, arXiv:2305.09451, the Z2/Eguchi-Hanson case; Kronheimer-Nakajima flat connection). [E] inner grading: h = (2,2,2,2,2;0^4) reads the glue class mod 4 on all 240 roots => glue = Ad(exp(2 pi i h/4)) = flat Z4 monodromy; A3-side h' = (0^5;1,1,1,-3) = the diagonal (1,1) glue of Z4 x Z4 (v92/v125); Z2 halfway 120 = SO(16) / 128 = spinor. [E] C^2/Z4 IS the A3 singularity XY = Z^4 (Molien + Hilbert (1+t^4)/((1-t^2)(1-t^4)) exact). [E] equivariant SDYM(E8) sector closes: D[d] = 60(d+1) even / 64(d+1) odd -- works ONLY because dim g_j = (60,64,60,64); zero modes = carrier D5+A3+Cartan = 60; density 1/4 = 1/|Z4|. [E] (E8)_1 character = sum of the 4 glue-coset sectors (1+248q+4124q^2+34752q^3, v377); sector weights = the v92/v125 discriminant form (5x^2+3y^2)/8; glue diagonal h = (0,1,1,1) integer = local extension. [E] correction: the A3 deck acts on the celestial sphere as z -> -z (order 2); the order-4 clock z -> iz is the U(2) phase diag(i,1) (normalises the deck, det = i rotates omega by the mu4 generator), spin bridge (spin clock)^2 = deck, Z8 with 8 = 2|mu4|. [E] clock-invariant A3 deformation = 1-parameter XY = Z^4 + a0, branch points = ONE mu4 orbit, cross-ratio 2 (v168/v214 pillowcase). [E] negative controls: diag(i,i) killed 3 ways; false glue breaks additivity 3112/6720; rigidity = Aut(Z4). [C] verdict B: match under the ONE named identification clock^2 = deck. [O] structural arithmetic only -- no celestial duality constructed; CELEST.SEAM.01 stays a research contract; SEAM.EQUIV.01 stays [O]. Exact (sympy).
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