Pith Number

pith:6VDIWPRN

pith:2026:6VDIWPRNVJTMYUTFVZ6SECSM5E

not attested not anchored not stored refs pending

Reliability of uGMRT Band-4 Polarimetry: Results from a Quadrature Hybrid Polarizer Bypass Experiment

Arpan Pal, Ganesh Kumbhar, Sanjeet Rai

Bypassing the quadrature hybrid polarizer in uGMRT Band 4 eliminates the dominant source of polarimetric instability and enables accurate sub-GHz polarization measurements.

arxiv:2604.06399 v2 · 2026-04-07 · astro-ph.IM

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{6VDIWPRNVJTMYUTFVZ6SECSM5E}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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

These results establish that the QH polarizer is the dominant source of polarimetric instability in uGMRT Band 4 and demonstrate that its removal enables reliable sub-GHz polarimetry.

C2weakest assumption

That the bypass experiment isolates the QH polarizer as the sole cause of the observed instability without introducing new systematics in the frontend signal chain or calibration process.

C3one line summary

Bypassing the quadrature hybrid polarizer in uGMRT Band-4 reduces instrumental leakage from 10-15% to 2-5%, stabilizes cross-hand phases, and allows accurate polarization angle measurements across the band.

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-25T02:01:19.016207Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f5468b3e2daa66cc5265ae7d220a4ce92e2cfd689d59bcdf6395648a54b6353a

Aliases

arxiv: 2604.06399 · arxiv_version: 2604.06399v2 · doi: 10.48550/arxiv.2604.06399 · pith_short_12: 6VDIWPRNVJTM · pith_short_16: 6VDIWPRNVJTMYUTF · pith_short_8: 6VDIWPRN

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/6VDIWPRNVJTMYUTFVZ6SECSM5E \
  | 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: f5468b3e2daa66cc5265ae7d220a4ce92e2cfd689d59bcdf6395648a54b6353a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8456be65bd8bcc4fa66626a52a7b8dd43737e16e033c78868021944eb845df12",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2026-04-07T19:32:57Z",
    "title_canon_sha256": "8532f44ee3aa0a449b021b710ced0c9cbf76f062b94a9943fe2ebaf88d02fd14"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.06399",
    "kind": "arxiv",
    "version": 2
  }
}