{
  "abstract": "We explore the phases and active-to-absorbing state phase transitions (AAPT) in a two-species model, where the species A and its mutant B are {\\em asymmetrically} or {\\em nonreciprocally} coupled. We identify a multicritical point that connects the global absorbing state of both the species and its mutant, with a uniform active state. The critical dynamics at this multicritical point is studied within the lowest order perturbation theory. This asymmetric coupling between species A and mutant B leads to unequal and distinct upper critical dimensions $d_c^A$ and $d_c^B$ respectively for A and B dynamics. We show that the multicritical point in this model is characterised by an unusual breakdown of scale-invariance by fluctuation-induced logarithmic modulations with power law behaviour of the order parameter and correlation lengths of the species A at all dimensions $d<d_c^A$. Above $d_c^A$, conventional scale-invariance is restored. The dynamics of the mutant species B belongs to the DP universality class with an upper critical dimension of $d_c^B=4$",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.03123",
  "author_total": 2,
  "authors": [
    {
      "name": "Astik Haldar"
    },
    {
      "name": "Abhik Basu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/08cyk08qd25b0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.03123",
  "fulltext_url": null,
  "id": "08cyk08qd25b0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.03123",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.stat-mech"
    ],
    [
      "openalex",
      "3104|Theoretical and Computational Physics"
    ]
  ],
  "openalex": "W7208786784",
  "pdf_url": "https://arxiv.org/pdf/2609.03123",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/08cyk08qd25b0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:31Z",
      "native_id": "2609.03123",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.03123"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.stat-mech",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Death by mutants: unusual multicritical dynamics in a two-species model for absorbing state transitions",
  "title_text": "Death by mutants: unusual multicritical dynamics in a two-species model for absorbing state transitions",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:31Z",
  "url": "https://research.draconitic.com/paper/08cyk08qd25b0",
  "venue": "arXiv",
  "versions": []
}