{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,23]],"date-time":"2025-10-23T17:07:09Z","timestamp":1761239229235,"version":"build-2065373602"},"reference-count":52,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2025,2,13]],"date-time":"2025-02-13T00:00:00Z","timestamp":1739404800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Union\u2014Next Generation EU","award":["P2022T2JZ9","PE0000023-NQSTI"],"award-info":[{"award-number":["P2022T2JZ9","PE0000023-NQSTI"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>The Thirring Quantum Cellular Automaton (QCA) describes the discrete time dynamics of local fermionic modes that evolve according to one step of the Dirac cellular automaton, followed by the most general on-site number-preserving interaction, and serves as the QCA counterpart of the Thirring model in quantum field theory. In this work, we develop perturbative techniques for the QCA path sum approach, expanding both the number of interaction vertices and the mass parameter of the Thirring QCA. By classifying paths within the regimes of very light and very heavy particles, we computed the transition amplitudes in the two- and three-particle sectors to the first few orders. Our investigation into the properties of the Thirring QCA, addressing the combinatorial complexity of the problem, yielded some useful results applicable to the many-particle sector of any on-site number-preserving interactions in one spatial dimension.<\/jats:p>","DOI":"10.3390\/e27020198","type":"journal-article","created":{"date-parts":[[2025,2,13]],"date-time":"2025-02-13T12:06:32Z","timestamp":1739448392000},"page":"198","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A Perturbative Approach to the Solution of the Thirring Quantum Cellular Automaton"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9356-3448","authenticated-orcid":false,"given":"Alessandro","family":"Bisio","sequence":"first","affiliation":[{"name":"Dipartimento di Fisica, Universit\u00e0 di Pavia, 27100 Pavia, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare Sezione di Pavia, via Agostino Bassi, 6, 27100 Pavia, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4825-4264","authenticated-orcid":false,"given":"Paolo","family":"Perinotti","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica, Universit\u00e0 di Pavia, 27100 Pavia, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare Sezione di Pavia, via Agostino Bassi, 6, 27100 Pavia, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-7083-4093","authenticated-orcid":false,"given":"Andrea","family":"Pizzamiglio","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica, Universit\u00e0 di Pavia, 27100 Pavia, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare Sezione di Pavia, via Agostino Bassi, 6, 27100 Pavia, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-5763-8897","authenticated-orcid":false,"given":"Saverio","family":"Rota","sequence":"additional","affiliation":[{"name":"Dipartimento di Fisica, Universit\u00e0 di Pavia, 27100 Pavia, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"467","DOI":"10.1007\/BF02650179","article-title":"Simulating physics with computers","volume":"21","author":"Feynman","year":"1982","journal-title":"Int. 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