,
Benjamin Hellouin de Menibus
Creative Commons Attribution 4.0 International license
The classical Domino problem asks whether there exists a tiling in which none of the forbidden patterns given as input appear. In this paper, we consider the aperiodic version of the Domino problem: given as input a family of forbidden patterns, does it allow an aperiodic tiling? The input may correspond to a subshift of finite type, a sofic subshift or an effective subshift. [Grandjean et al., 2018] proved that this problem is co-recursively enumerable (Π₀¹-complete) in dimension 2 for geometrical reasons. We show that it is much harder, namely analytic (Σ₁¹-complete), in higher dimension: d ≥ 4 in the finite type case, d ≥ 3 for sofic and effective subshifts. The reduction uses a subshift embedding universal computation and two additional dimensions to control periodicity. This complexity jump is surprising for two reasons: first, it separates 2- and 3-dimensional subshifts, whereas most subshift properties are the same in dimension 2 and higher; second, it is unexpectedly large.
@InProceedings{callard_et_al:LIPIcs.STACS.2022.19,
author = {Callard, Antonin and Hellouin de Menibus, Benjamin},
title = {{The Aperiodic Domino Problem in Higher Dimension}},
booktitle = {39th International Symposium on Theoretical Aspects of Computer Science (STACS 2022)},
pages = {19:1--19:15},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-222-8},
ISSN = {1868-8969},
year = {2022},
volume = {219},
editor = {Berenbrink, Petra and Monmege, Benjamin},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.STACS.2022.19},
URN = {urn:nbn:de:0030-drops-158296},
doi = {10.4230/LIPIcs.STACS.2022.19},
annote = {Keywords: Subshift, periodicity, aperiodicity, domino problem, subshift of finite type, sofic subshift, effective subshift, tilings, computability}
}