Around the Razumov-Stroganov conjecture: proof of a multi-parameter sum rule
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We prove that the sum of entries of the suitably normalized groundstate vector of the O(1) loop model with periodic boundary conditions on a periodic strip of size 2n is equal to the total number of n x n alternating sign matrices. This is done by identifying the state sum of a multi-parameter inhomogeneous version of the O(1) model with the partition function of the inhomogeneous six-vertex model on a n x n square grid with domain wall boundary conditions.
30 pages. v2: Eq. (3.38) corrected. v3: title changed, references added. v4: q and q^{-1} switched to conform to standard conventions
30 pages. v2: Eq. (3.38) corrected. v3: title changed, references added. v4: q and q^{-1} switched to conform to standard conventions