Pith Number

pith:R3SJEWID

pith:2025:R3SJEWID7EIVPL2UBNJ42IYBIA

not attested not anchored not stored refs pending

Accessing the homogeneity scale with 21 cm intensity mapping surveys

Bruno B. Bizarria, Camila P. Novaes, Carlos A. Wuensche, Felipe Avila, Gabriel A. S. Silva, Helissa H. da Costa, Rahima Mokeddem

Beam convolution in 21 cm intensity mapping erases the homogeneity scale beyond a redshift-dependent maximum beam width.

arxiv:2511.13931 v2 · 2025-11-17 · astro-ph.CO

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\usepackage{pith}
\pithnumber{R3SJEWID7EIVPL2UBNJ42IYBIA}

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Record completeness

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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

For any given redshift z, we identify a maximum beam width, σ_max(z), beyond which the homogeneity scale cannot be recovered. This limit defines an inaccessible region in the σ × z parameter space, where R_H is erased by beam smoothing.

C2weakest assumption

The intrinsic clustering signal (before beam convolution) can be accurately modeled using the two-point correlation function and correlation dimension D2(r) such that the suppression effect is cleanly separable from the true homogeneity scale.

C3one line summary

Beam convolution in 21cm IM surveys erases the homogeneity scale R_H beyond a redshift-dependent maximum beam width σ_max(z) identified via the correlation dimension D2(r).

Cited by

2 papers in Pith

Impact of inhomogeneous curvature on growth rate measurements from magnitude fluctuations

The velocity coherence scale: a novel probe of cosmic homogeneity and a potential standard ruler

Receipt and verification

First computed	2026-05-26T01:02:29.212579Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8ee4925903f91157af540b53cd230140004796d713f00cb23f65e9c02b3c3b8c

Aliases

arxiv: 2511.13931 · arxiv_version: 2511.13931v2 · doi: 10.48550/arxiv.2511.13931 · pith_short_12: R3SJEWID7EIV · pith_short_16: R3SJEWID7EIVPL2U · pith_short_8: R3SJEWID

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/R3SJEWID7EIVPL2UBNJ42IYBIA \
  | 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: 8ee4925903f91157af540b53cd230140004796d713f00cb23f65e9c02b3c3b8c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "518708e2b223a7ab0d077f8e374f8a5ba7a5c9db0b12aea79125885c91edd81d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2025-11-17T21:35:07Z",
    "title_canon_sha256": "bfc834b99f10047126e840fdeda9d74d201266e0e2d49979f54fa00d6fd60076"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2511.13931",
    "kind": "arxiv",
    "version": 2
  }
}