Pith Number

pith:Y5HUBNJI

pith:2026:Y5HUBNJI2BXWDQWDU5ENRNOGK4

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Massive hybrid stars within the extended three-flavor quark-meson diquark model

Jens O. Andersen, Mathias P. N{\o}dtvedt

The extended three-flavor quark-meson diquark model produces hybrid stars with masses and radii matching observations when vector and axial-vector mesons are included.

arxiv:2605.05816 v2 · 2026-05-07 · hep-ph · astro-ph.HE · nucl-th

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Claims

C1strongest claim

We show that it is possible to construct hybrid stars whose masses and radii are in agreement with recent astrophysical observations and perturbative QCD (pQCD). The addition of vector and axial vector mesons to the quark-meson diquark is essential, since it makes the EoS sufficiently stiff for intermediate densities. Our results suggest that stars with a mass larger than M∼2M⊙ have a quark core with a central density nB≥3.9nsat.

C2weakest assumption

The mean-field approximation at zero temperature together with the specific choice of model parameters that are adjusted to simultaneously match astrophysical observations, the low-density nuclear equation of state, and perturbative QCD constraints at high density.

C3one line summary

Adding vector and axial-vector mesons to the extended quark-meson diquark model produces a sufficiently stiff equation of state to support hybrid stars above 2 solar masses with quark cores at central densities of at least 3.9 times nuclear saturation density.

Cited by

1 paper in Pith

Non-Parametric Equation of State Reveals Non-Conformal Behavior Beyond Neutron Star Densities

Receipt and verification

First computed	2026-06-01T01:02:41.759681Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c74f40b528d06f61c2c3a748d8b5c65715310967303784a0761b7a62aa94b6f4

Aliases

arxiv: 2605.05816 · arxiv_version: 2605.05816v2 · doi: 10.48550/arxiv.2605.05816 · pith_short_12: Y5HUBNJI2BXW · pith_short_16: Y5HUBNJI2BXWDQWD · pith_short_8: Y5HUBNJI

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/Y5HUBNJI2BXWDQWDU5ENRNOGK4 \
  | 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: c74f40b528d06f61c2c3a748d8b5c65715310967303784a0761b7a62aa94b6f4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "98ecea82ba555833e94b9a5a776021d5e99dabce4dc4abc42a29d25eb9fcb3fc",
    "cross_cats_sorted": [
      "astro-ph.HE",
      "nucl-th"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "hep-ph",
    "submitted_at": "2026-05-07T07:54:04Z",
    "title_canon_sha256": "39ebf648f44e26116756b27e5f4d8fa82e43dce8b8534bc878acec08f1606c91"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.05816",
    "kind": "arxiv",
    "version": 2
  }
}