Pith Number

pith:T7VC7KSN

pith:2026:T7VC7KSNHVI3WK6UAPEU2RDBFJ

not attested not anchored not stored refs resolved

Improved recipes for peculiar velocity power spectra using Evolution Mapping

Andr\'es N. Ruiz, Ariel G. S\'anchez, Julien Bel, Matteo Esposito

New fitting functions for peculiar velocity power spectra reach 1-2 percent accuracy by parametrizing non-linear evolution with the clustering amplitude σ12.

arxiv:2605.13948 v1 · 2026-05-13 · astro-ph.CO

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\pithnumber{T7VC7KSNHVI3WK6UAPEU2RDBFJ}

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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

Validation against independent simulations spanning a broad range of cosmological models confirms an accuracy of 1-2 per cent on scales where the measurements are robust, systematically outperforming existing prescriptions.

C2weakest assumption

That neglecting deviations from the exact evolution mapping relation induced by differing growth histories introduces only subdominant errors for most cosmologies of practical interest.

C3one line summary

Improved fitting functions for P_θθ(k) and P_δθ(k) parametrized by σ12 achieve 1-2% accuracy across cosmologies and outperform existing prescriptions.

References

60 extracted · 60 resolved · 11 Pith anchors

[1] Evolution mapping: a new approach to describe matter clustering in the non-linear regime. , keywords =. doi:10.1093/mnras/stac1656 , archivePrefix =. 2108.12710 , primaryClass = · doi:10.1093/mnras/stac1656

[2] S\'anchez, Ariel G. , journal =. Arguments against using. 2020 , month =. doi:10.1103/PhysRevD.102.123511 , url = 2020 · doi:10.1103/physrevd.102.123511

[3] Accelerating uni- verses with scaling dark matter · doi:10.1142/s0218271801000822

[4] Exploring the expansion history of the universe 2003 · doi:10.1103/physrevlett.90.091301

[5] Galaxy Formation and Evolution

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-17T23:39:13.773983Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9fea2faa4d3d51bb2bd403c94d44612a6999a00fa93cb479a557d457cf884e13

Aliases

arxiv: 2605.13948 · arxiv_version: 2605.13948v1 · doi: 10.48550/arxiv.2605.13948 · pith_short_12: T7VC7KSNHVI3 · pith_short_16: T7VC7KSNHVI3WK6U · pith_short_8: T7VC7KSN

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/T7VC7KSNHVI3WK6UAPEU2RDBFJ \
  | 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: 9fea2faa4d3d51bb2bd403c94d44612a6999a00fa93cb479a557d457cf884e13

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8b78bea08141e0975c96ec475004850d075c66df4896126b06b30f242d65d14c",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2026-05-13T18:00:00Z",
    "title_canon_sha256": "3406d2a95568fc47b19db2c145b7366c2f056c85d1ee670eac65f20a9bf3673f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13948",
    "kind": "arxiv",
    "version": 1
  }
}