Matrix products in integrable probability
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1 Matrix products in integrable probability Atsuo Kuniba (Univ. Tokyo) Mathema?cal Society of Japan Spring Mee?ng Tokyo Metropolitan University 27 March 2017
2 Non-equilibrium sta?s?cal mechanics Stochas?c dynamics, Markov process, Integrable systems Quantum groups, Yang-Baxter equa?on, Integrable Markov process Spectral problem of the Markov matrix: solvable by Bethe ansatz Exact asympto?c analysis: connec?on to random matrices, etc Prototype examples Asymmetric simple exclusion process (ASEP) Asymmetric zero range process (ZRP) Key features Stochas?c R matrix Sta?onary states: matrix product structure Zamolodchikov-Faddeev algebra Hidden 3D structure related to the tetrahedron equa?on (no detail today)
3 This talk is mainly based on K, Mangazeev, Okado, Stochas?c R matrix for U q (A (1) n ), Nucl. Phys. B913 (2016) K and Okado, A q-boson representa?on of Zamolodchikov Faddeev algebra for stochas?c R matrix of U q (A (1) n ), Le_. Math. Phys. 50 (2017) K, Maruyama, Okado, Mul?species totally asymmetric zero range process: II. Hat rela?on and tetrahedron equa?on, J. Integrable Syst. 1 (2015) Contents. I. Quantum/stochas?c R matrices Can a quantum R matrix be made stochas4c? U q (A (1) n ), symmetric tenor representa?on, quantum R matrix, stochas?c gauge, specializa?on manifes?ng nonnega?vity, stochas?c R matrix II. Integrable Markov process III. Sta?onary states and matrix product formula
4 Preliminary on quantum groups
5 Symmetric tensor representa?on
6 Quantum R matrix
7 Stochas?c gauge: S(z)
8 Specializa?on manifes?ng (ii) Nonnega?vity
9 Stochas?c R matrix
10 Contents. I. Quantum/Stochas?c R matrices II. Integrable Markov process commu?ng Markov transfer matrices, discrete?me Markov Process, con?nuous?me Markov Process III. Sta?onary states and matrix product formula
11 Commu?ng Markov transfer matrices
12 Discrete?me Markov Process
13 Con?nuous?me Markov Process (1)
14 Con?nuous?me Markov Process (2) n=3 example Par?cles h - h +
15 Contains many integrable stochas?c models known earlier (taken from Kuan ArXiv: )
16 Contents. I. Quantum/Stochas?c R matrices II. Integrable Markov process III. Sta?onary states and matrix product formula sta?onary states, example, matrix product formula, Zamolodchikov-Faddeev algebra, q-boson realiza?on, final remarks.
17 Sta?onary states Sta?onary probability
18 in a certain normaliza?on.
19 Matrix product formula T is nonnega?ve and sa?sfies Sum-to-1. Perron-Frobenius Sta?onary states are algebraic.
20 Matrix product formula T is nonnega?ve and sa?sfies Sum-to-1. Perron-Frobenius Sta?onary states are algebraic. T is the transfer matrix of a Yang-Baxter integrable lakce model. Bethe ansatz Sta?onary states are transcendental in general.
21 Matrix product formula T is nonnega?ve and sa?sfies Sum-to-1. Perron-Frobenius Sta?onary states are algebraic. T is the transfer matrix of a Yang-Baxter integrable lakce model. Bethe ansatz Sta?onary states are transcendental in general. Operators ac?ng on some auxiliary space
22 Zamolodchikov-Faddeev algebra (1) Symbolically Originally introduced in integrable quantum field theories in (1+1)-dimension. Structure func?on in that context = Sca_ering matrix sa?sfying Unitarity Present context: Local form of the sta?onary condi?on Structure func?on = Stochas?c R sa?sfying Sum-to-1 It is a part of so-called RLL rela3on
23 Zamolodchikov-Faddeev algebra (2) ( ) ( ), which is a standard maneuver in dealing with quantum Knizhnik-Zamolodchikov type equa4on.
24 q-boson realiza?on (1)
25 q-boson realiza?on (2)
26 Final Remark (1) ``Grand canonical par??on func?on ``Canonical par??on func?on Symmetric ra?onal func?on of z 1,, z L Similar construc?ons for the simplest stochas?c R matrix S 1,1 (z) with boundary twist have led to generaliza?ons of Macdonald polynomials and their matrix product formulas. cf. Can?ni-de Gier-Wheeler, Borodin-Petrov,
27 Final Remark (2) Layer transfer matrix Tetrahedron equa?on Bilinear rela?on of Layer transfer matrices ZF rela?on at q=0 Leads to combinatorial algorithm for sta?onary probability related to crystals. Rela?on of this X(x) at q=0 and the previous one is yet to be clarified.
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