Pith Number

pith:XMC2ZM3M

pith:2026:XMC2ZM3MFQ2EWPM6UPNUIGFXTB

not attested not anchored not stored refs pending

Density-protected states in active matter under virtual confinement

Beno\^it Mahault, Francesco Ginelli, Giuseppe Fava

Dry active nematics under circular virtual confinement self-assemble into dense boundary rings that enclose a disordered core with self-selected density independent of global particle number.

arxiv:2604.24232 v2 · 2026-04-27 · cond-mat.soft

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\usepackage{pith}
\pithnumber{XMC2ZM3MFQ2EWPM6UPNUIGFXTB}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

the system generically self-assembles into a dense, nematically ordered ring at the boundary of circular illumination patterns. Remarkably, these boundary structures give rise to a protected disordered core whose density is self-selected and independent of the global particle density.

C2weakest assumption

That the minimal model of dry active nematics and the corresponding hydrodynamic theory accurately capture the essential physics of photo-responsive behavior and that the observed states emerge generically rather than as simulation artifacts.

C3one line summary

Dry active nematics under circular illumination self-assemble into a dense nematically ordered ring at the boundary that protects a disordered core with self-selected density independent of global density.

Receipt and verification

First computed	2026-05-29T02:05:45.196269Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bb05acb36c2c344b3d9ea3db4418b7985ce0f937a75b1226bf8acdb14acb652b

Aliases

arxiv: 2604.24232 · arxiv_version: 2604.24232v2 · doi: 10.48550/arxiv.2604.24232 · pith_short_12: XMC2ZM3MFQ2E · pith_short_16: XMC2ZM3MFQ2EWPM6 · pith_short_8: XMC2ZM3M

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/XMC2ZM3MFQ2EWPM6UPNUIGFXTB \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: bb05acb36c2c344b3d9ea3db4418b7985ce0f937a75b1226bf8acdb14acb652b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3fb1f9ae1b712ae820ee44fd103b1413c0e4d829f55de98737d51acde26cabb1",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cond-mat.soft",
    "submitted_at": "2026-04-27T09:40:58Z",
    "title_canon_sha256": "2752679b4a3b2cdfbfa0b91a39d81223e8cb32053947d2a6786dc8c2be955fcb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.24232",
    "kind": "arxiv",
    "version": 2
  }
}