Pith Number

pith:MW62G6EN

pith:2026:MW62G6EN3IG3EA7T25IMUG25Q5

not attested not anchored not stored refs pending

Homothetic Killing horizons in generic Vaidya spacetimes

Nilay Kundu, Ritwika Ghoshal, Srijit Bhattacharjee

Vaidya spacetimes admit unique homothetic Killing vectors when mass, charge or spin parameters vary linearly with advanced time.

arxiv:2604.09760 v2 · 2026-04-10 · gr-qc · hep-th

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Claims

C1strongest claim

We show that these spacetimes admit a unique class of conformal Killing vectors that are homothetic for mass, charge, or rotation parameters being linear functions of the advanced null-time.

C2weakest assumption

The assumption that the mass, charge, or rotation parameters are linear functions of the advanced null-time, which is required for the homothetic property to hold and for the conformal mapping to work.

C3one line summary

Generic Vaidya spacetimes with linear time-dependent mass, charge or rotation admit unique homothetic Killing vectors, allowing conformal mapping to stationary metrics and thermodynamic analysis of homothetic Killing horizons.

Cited by

1 paper in Pith

Bekenstein-Hawking temperature from the Schwarzian

Receipt and verification

First computed	2026-07-22T01:23:55.809703Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

65bda3788dda0db203f3d750ca1b5d8747fcc461064d0531a3bfb000a8df4f53

Aliases

arxiv: 2604.09760 · arxiv_version: 2604.09760v2 · doi: 10.48550/arxiv.2604.09760 · pith_short_12: MW62G6EN3IG3 · pith_short_16: MW62G6EN3IG3EA7T · pith_short_8: MW62G6EN

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/MW62G6EN3IG3EA7T25IMUG25Q5 \
  | 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: 65bda3788dda0db203f3d750ca1b5d8747fcc461064d0531a3bfb000a8df4f53

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2f34db58a4b7d6150bc904fe289339681318ce124f29a1cd44a874a661129314",
    "cross_cats_sorted": [
      "hep-th"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2026-04-10T17:26:41Z",
    "title_canon_sha256": "88d5032b96fbdef9e5304ad4b73d9c6f5f5387213a46e544113119bce15b4270"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.09760",
    "kind": "arxiv",
    "version": 2
  }
}