Pith Number

pith:47C2FXX7

pith:2026:47C2FXX73OYRAXR3LCKKTPRKFQ

not attested not anchored not stored refs pending

Wading the String Bog: CMB Birefringence in the Swampland

Alexander Westphal, Guido D'Amico, Nemanja Kaloper

arxiv:2607.27318 v1 · 2026-07-29 · hep-th · astro-ph.CO · gr-qc · hep-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{47C2FXX73OYRAXR3LCKKTPRKFQ}

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.

Receipt and verification

First computed	2026-07-31T00:10:36.267442Z
Builder	pith-number-builder-2026-05-17-v1
Signature	unsigned_v0
Schema	pith-number/v1.0

Canonical hash

e7c5a2deffdbb1105e3b5894a9be2a2c1c883095d06df0812bbacd4080212025

Aliases

arxiv: 2607.27318 · arxiv_version: 2607.27318v1 · doi: 10.48550/arxiv.2607.27318 · pith_short_12: 47C2FXX73OYR · pith_short_16: 47C2FXX73OYRAXR3 · pith_short_8: 47C2FXX7

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/47C2FXX73OYRAXR3LCKKTPRKFQ \
  | 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: e7c5a2deffdbb1105e3b5894a9be2a2c1c883095d06df0812bbacd4080212025

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c77d5c069762ae7fef254d3eb1a75af3716222c97b589472482fec88297103d9",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "gr-qc",
      "hep-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "hep-th",
    "submitted_at": "2026-07-29T18:00:00Z",
    "title_canon_sha256": "d7a8db4fdb811a5ec32f705f83080164d354566a50dfd88b759b011d98c4cbcf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.27318",
    "kind": "arxiv",
    "version": 1
  }
}