More on Intractability of Thermalization: (almost) i.i.d. inputs and finite lattices

Abstract: This work is an extention of Shiraishi and Matsumoto [10], and discusses the computational complexity of the long-term average of local observables in one-dimensional lattices with shift-invariant nearest-neighbor interactions for simple initial states. As shown in the previous paper, the problem is generally intractable. In this paper we refine the statement further. First, we consider restriction of the initial state, where the state of all the sites are the same except for a single site. We show this version of the problem is also undecidable (RE-complete). Then we turn to the case where the lattice size is finite: depening on the defitiniton of the input size, this version of problem is either EXPSPACE-complete or PSPACE-complete.