A Yang-Baxter integrable cellular automaton with a four site update rule

We present a one dimensional reversible block cellular automaton, where the time evolution is dictated by a period 3 cycle of update rules. At each time step a subset of the cells is updated using a four site rule with two control bits and two action bits. The model displays rich dynamics. There are three types of stable particles, left movers, right movers and 'frozen' bound states that only move as an effect of scattering with the left and rightmovers. Multi-particle scattering in the system is factorized. We embed the model into the canonical framework of Yang-Baxter integrability by rigorously proving the existence of a commuting set of diagonal-to-diagonal transfer matrices. The construction involves a new type of Lax operator.

Automated summary

The model presented is a one-dimensional reversible block cellular automaton with time evolution dictated by a period 3 cycle of update rules, displaying rich dynamics. The system features three types of stable particles and factorized multi-particle scattering. The model is embedded into the canonical framework of Yang-Baxter integrability by proving the existence of a commuting set of diagonal-to-diagonal transfer matrices, involving a new type of Lax operator.