On two non-ergodic reversible cellular automata, one classical, the other quantum

Abstract

We propose and discuss two variants of kinetic particle models—cellular automata in 1 + 1 dimensions—that have some appeal due to their simplicity and intriguing properties, which could warrant further research and applications. The first model is a deterministic and reversible automaton describing two species of quasiparticles: stable massless matter particles moving with velocity ±1 and unstable standing (zero velocity) field particles. We discuss two distinct continuity equations for three conserved charges of the model. While the first two charges and the corresponding currents have support of three lattice sites and represent a lattice analogue of the conserved energy–momentum tensor, we find an additional conserved charge and current with support of nine sites, implying non-ergodic behaviour and potentially signalling integrability of the model with a highly nested R-matrix structure. The second model represents a quantum (or stochastic) deformation of a recently introduced and studied charged hardpoint lattice gas, where particles of different binary charge (±1) and binary velocity (±1) can nontrivially mix upon elastic collisional scattering. We show that while the unitary evolution rule of this model does not satisfy the full Yang–Baxter equation, it still satisfies an intriguing related identity which gives birth to an infinite set of local conserved operators, the so-called glider operators.

Keywords

celični avtomati;ergodičnost;zlom ergodičnosti;integrabilnost;dinamični sistemi;cellular automata;ergodicity;ergodicity breaking;integrability;dynamical systems;

Data

Language:	English
Year of publishing:	2023
Typology:	1.01 - Original Scientific Article
Organization:	UL FMF - Faculty of Mathematics and Physics
UDC:	536.9
COBISS:	191436035
ISSN:	1099-4300
Views:	10
Downloads:	2
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	celični avtomati;ergodičnost;zlom ergodičnosti;integrabilnost;dinamični sistemi;
Type (COBISS):	Article
Pages:	13 str.
Volume:	ǂVol. ǂ25
Issue:	ǂiss. ǂ5, art. no. 739
Chronology:	Apr. 2023
DOI:	10.3390/e25050739
ID:	23341270