Pith Number

pith:IEUZIUNQ

pith:2026:IEUZIUNQVMX6FSKVT3KZBV3IEE

not attested not anchored not stored refs resolved

Sign-Switching Dark Energy: Smooth Transitions with Recent DESI DR2 Observations

Be\~nat Ibarra-Uriondo, Mariam Bouhmadi-L\'opez

Sign-switching dark energy models reduce the Hubble tension and fit DESI DR2 observations better than standard ΛCDM.

arxiv:2602.12347 v2 · 2026-02-12 · astro-ph.CO · gr-qc · hep-ph · hep-th

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\usepackage{pith}
\pithnumber{IEUZIUNQVMX6FSKVT3KZBV3IEE}

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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 sign-switching scenario significantly alleviates the Hubble tension while obtaining better results when statistically comparing with ΛCDM, as quantified by the Akaike and Bayesian information Criteria.

C2weakest assumption

The model is explored only at the background level, so the assumption that perturbations around the sign switch do not spoil the fit or introduce new tensions with structure-formation data must hold.

C3one line summary

Sign-switching dark energy with a transition at z_† fits recent DESI DR2, Planck CMB, and Pantheon+ data better than ΛCDM while raising the inferred Hubble constant and easing the Hubble tension.

References

124 extracted · 124 resolved · 46 Pith anchors

[1] Although BAO data are also sensitive to Ω m, an additional prior is required to fully break the degeneracy between the expansion rate and the sound-horizon scale

[2] Baryon Acoustic Oscillations BAO constitute a powerful observational probe for constraining cosmological parameters, particularly when combined with complementary datasets such as the CMB. The charact 2018

[3] Cosmic Microwave Background The CMB is one of the most powerful observational tools for studying the early Universe, carrying detailed information about cosmological evolution from the epoch of photon

[4] Fitting the models to these data reveals a significant shift in the inferred value ofH 0 relative to ΛCDM

[5] The parametersH 0 and Ω m0 appear to increase across all models relative to ΛCDM, particularly in LΛCDM and SSCDM

Formal links

2 machine-checked theorem links

Cited by

4 papers in Pith

Signatures of Modified Gravity Below $\mathcal{O}(10)$ Mpc in a Dynamical Dark Energy Background

Exploring the interplay of late-time dynamical dark energy and new physics before recombination

Constraints on Coupled Dark Energy in the DESI Era

Do equation of state parametrizations of dark energy faithfully capture the dynamics of the late universe?

Receipt and verification

First computed	2026-05-17T23:38:59.952665Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

41299451b0ab2fe2c9559ed590d768211e67380129404c7f0b910288e8ba42cf

Aliases

arxiv: 2602.12347 · arxiv_version: 2602.12347v2 · doi: 10.48550/arxiv.2602.12347 · pith_short_12: IEUZIUNQVMX6 · pith_short_16: IEUZIUNQVMX6FSKV · pith_short_8: IEUZIUNQ

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/IEUZIUNQVMX6FSKVT3KZBV3IEE \
  | 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: 41299451b0ab2fe2c9559ed590d768211e67380129404c7f0b910288e8ba42cf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "acd864b2e4ed923505cdf6e8c31ec70fb73e3b4447bd88d272f038478c3807d2",
    "cross_cats_sorted": [
      "gr-qc",
      "hep-ph",
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2026-02-12T19:08:27Z",
    "title_canon_sha256": "70c19d6eb0c1cb852ec6ae212181b4f49ac165938c4cdb1c8c980ea30d4abd60"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2602.12347",
    "kind": "arxiv",
    "version": 2
  }
}