Pith Number

pith:5IWCVEDZ

pith:2026:5IWCVEDZY4V4NBSOGQ565DOHMD

not attested not anchored not stored refs resolved

On the importance of radiation-era initial conditions for tensor perturbations

Dra\v{z}en Glavan, Ignacy Sawicki, Juraj Klari\'c, Philipp Klose

Physical initial conditions for radiation during reheating preserve the conservation of super-horizon tensor fluctuations.

arxiv:2602.03961 v2 · 2026-02-03 · hep-th · gr-qc · hep-ph

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\pithnumber{5IWCVEDZY4V4NBSOGQ565DOHMD}

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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

The deviation from super-horizon conservation is then negligible, recovering the standard result from kinetic theory. In contrast, a globally homogeneous and isotropic plasma state leads to a large suppression of tensor amplitudes.

C2weakest assumption

The physical radiation initial state during reheating is affected by tensor perturbations already present, leading to local rather than global equilibrium.

C3one line summary

Tensor perturbations remain conserved on super-horizon scales when radiation initial conditions during reheating are locally perturbed by existing modes, unlike global equilibrium assumptions that suppress amplitudes.

References

34 extracted · 34 resolved · 10 Pith anchors

[1] Quantum Fluctuations and a Nonsingular Universe, 1981

[2] Spectrum of relict gravitational radiation and the early state of the universe, 1979

[3] Particle creation in expanding universes, 1968

[4] Planck 2018 results. X. Constraints on inflation 2018 · arXiv:1807.06211

[5] BICEP Array: a multi-frequency degree-scale CMB polarimeter 2018 · arXiv:1808.00568

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-17T23:39:00.078655Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ea2c2a9079c72bc6864e343bee8dc760fb606defbd04d80e15be8c100318b454

Aliases

arxiv: 2602.03961 · arxiv_version: 2602.03961v2 · doi: 10.48550/arxiv.2602.03961 · pith_short_12: 5IWCVEDZY4V4 · pith_short_16: 5IWCVEDZY4V4NBSO · pith_short_8: 5IWCVEDZ

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/5IWCVEDZY4V4NBSOGQ565DOHMD \
  | 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: ea2c2a9079c72bc6864e343bee8dc760fb606defbd04d80e15be8c100318b454

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f831d2051ce086b6fa3201c8ced9926456b8569a93245679dbd5c2696cece23e",
    "cross_cats_sorted": [
      "gr-qc",
      "hep-ph"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "hep-th",
    "submitted_at": "2026-02-03T19:22:57Z",
    "title_canon_sha256": "ec7149d233808358cbf07d566baac8f26b8a7348087409630534823aaf5b9a7d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2602.03961",
    "kind": "arxiv",
    "version": 2
  }
}