{
  "abstract": "We compute universal scaling exponents and scaling functions for massless scalar field theories far from equilibrium. Using a large-$N$ expansion to next-to-leading order, we investigate the nonperturbative infrared behaviour associated with the transport of a) energy or b) effective particle number towards low frequencies $ω$ and momenta $\\bar p$. For massless dispersion $ω= \\bar{p}$, we determine the scaling form of the distribution function whose universal power-law tail $f_S(\\bar p) \\sim 1/\\bar{p}^κ$ is found to be a) $κ= d+1$ and b) $κ= d$ in $d=3$ spatial dimensions. Our results establish that relativistic and nonrelativistic theories do not belong to the same universality class in this case, which opens up new applications to far-from-equilibrium phenomena in high-energy and (quantum) many-body physics with linear dispersions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.26491",
  "author_total": 4,
  "authors": [
    {
      "name": "Viktoria Noel"
    },
    {
      "name": "Chuang Huang"
    },
    {
      "name": "Aleksandr N. Mikheev"
    },
    {
      "name": "Jürgen Berges"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5yfc0cd92rh30.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.26491",
  "fulltext_url": null,
  "id": "5yfc0cd92rh30",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.26491",
  "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.quant-gas"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3104|Theoretical and Computational Physics"
    ]
  ],
  "openalex": "W7214074027",
  "pdf_url": "https://arxiv.org/pdf/2609.26491",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5yfc0cd92rh30.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2609.26491",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.26491"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Nonthermal fixed point for massless scalar field theories",
  "title_text": "Nonthermal fixed point for massless scalar field theories",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/5yfc0cd92rh30",
  "venue": "arXiv",
  "versions": []
}