Pith Number

pith:EYGFAWTL

pith:2026:EYGFAWTLZJWNUM5EQL6VNKPQTY

not attested not anchored not stored refs pending

Systematic Spectral Distortion from Digital Whitening in Radio Telescopes and Implications for 21 cm Cosmology

Daniel C. Jacobs, Gregg Hallinan, Larry R. D'Addario, Ruby Byrne

Digital whitening of radio signals followed by re-quantization introduces systematic spectral distortions at levels problematic for 21 cm cosmology.

arxiv:2605.05489 v2 · 2026-05-06 · astro-ph.IM · astro-ph.CO

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\usepackage{pith}
\pithnumber{EYGFAWTLZJWNUM5EQL6VNKPQTY}

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4 Citations open

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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

Although the effect can be small so that it has heretofore been unrecognized, we demonstrate that it produces distortion of the spectrum at a level that is problematic for some science, in particular 21 cm cosmology.

C2weakest assumption

That the observed distortion in OVRO-LWA data and the semi-analytic simulations arise specifically and solely from the whitening-plus-re-quantization sequence rather than from other unmodeled instrumental or environmental effects.

C3one line summary

Digital spectrum whitening followed by re-quantization introduces a previously unrecognized systematic distortion in the gain-versus-frequency response of radio telescopes, reaching levels problematic for 21 cm cosmology.

Receipt and verification

First computed	2026-06-23T02:13:24.736672Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

260c505a6bca6cda33a482fd56a9f09e29fde115653399af517c2787b2656d85

Aliases

arxiv: 2605.05489 · arxiv_version: 2605.05489v2 · doi: 10.48550/arxiv.2605.05489 · pith_short_12: EYGFAWTLZJWN · pith_short_16: EYGFAWTLZJWNUM5E · pith_short_8: EYGFAWTL

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/EYGFAWTLZJWNUM5EQL6VNKPQTY \
  | 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: 260c505a6bca6cda33a482fd56a9f09e29fde115653399af517c2787b2656d85

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2eb82274c3ecf9152321ff0dd8dd26dba5fa1411755c90e9f9a5f326db76cee4",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2026-05-06T22:24:31Z",
    "title_canon_sha256": "53cd8ac451aaee980d8496f04d0ec40f4c11296f919fa4bc9905da4549cad6be"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.05489",
    "kind": "arxiv",
    "version": 2
  }
}