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pith:K6LHR5T6

pith:1998:K6LHR5T6FX7I65TSFGVN3YWPQF
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Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant

Adam G. Riess, Alan Diercks, Alejandro Clocchiattia, Alexei V. Filippenko, B. Leibundgut, Brian P. Schmidt, Christopher Stubbs, Craig J. Hogan, David Reiss, John Tonry, J. Spyromilio, M. M. Phillips, Nicholas B. Suntzeff, Peter Challis, Peter M. Garnavich, R. Chris Smith, Robert A. Schommer, Robert P. Kirshner, Ron L. Gilliland, Saurabh Jha

Distant Type Ia supernovae appear 10 to 15 percent farther than expected in a low-density universe without a cosmological constant.

arxiv:astro-ph/9805201 v1 · 1998-05-15 · astro-ph

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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

With no prior constraint on mass density other than Omega_M > 0, the spectroscopically confirmed SNe Ia are consistent with q_0 <0 at the 2.8 sigma and 3.9 sigma confidence levels, and with Omega_Lambda >0 at the 3.0 sigma and 4.0 sigma confidence levels, for two fitting methods respectively. For a flat-Universe prior the data require Omega_Lambda >0 at 7 sigma and 9 sigma.

C2weakest assumption

That Type Ia supernovae at z ~ 0.5 have the same peak luminosity and light-curve shape distribution as nearby ones, with no redshift-dependent evolution or selection effects large enough to produce the observed 10-15% distance excess.

C3one line summary

High-redshift Type Ia supernovae data indicate the universe is accelerating its expansion, requiring Omega_Lambda > 0 and q_0 < 0.

References

4 extracted · 4 resolved · 1 Pith anchors

[1] A New Method for Determining Cumulative Gravitational Lensing Effects in Inhomogeneous Universes 1969 · arXiv:astro-ph/9708036
[2] Zehavi, I., Riess, A. G., Kirshner, R. P., & Dekel, A. 1998, Ap J, in press – 35 – Figure 1: Identification spectra (in f λ) of high-redshift SNe Ia. The spectra obtained for the 10 new SNe of the high 1998
[3] The open symbol is SN 1997ck (z = 0.97) which lacks spectroscopic classification and a color mea surement. The average difference between the data and the Ω M = 0.20, Ω Λ = 0 prediction is 0.25 mag. Fig 1995
[4] G., et al., 1998, @doi [AJ] 10.1086/300499 , http://adsabs.harvard.edu/abs/1998AJ....116.1009R 116 · arXiv:astro-ph/9805201

Formal links

2 machine-checked theorem links

Cited by

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Receipt and verification
First computed 2026-07-04T15:27:10.136996Z
Builder pith-number-builder-2026-05-17-v1
Signature Pith Ed25519 (pith-v1-2026-05) · public key
Schema pith-number/v1.0

Canonical hash

579678f67e2dfe8f767229aadde2cf8163ba9383fdf6a6d01b30eafd473bafa1

Aliases

arxiv: astro-ph/9805201 · arxiv_version: astro-ph/9805201v1 · doi: 10.48550/arxiv.astro-ph/9805201 · pith_short_12: K6LHR5T6FX7I · pith_short_16: K6LHR5T6FX7I65TS · pith_short_8: K6LHR5T6
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/K6LHR5T6FX7I65TSFGVN3YWPQF \
  | 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: 579678f67e2dfe8f767229aadde2cf8163ba9383fdf6a6d01b30eafd473bafa1
Canonical record JSON 
{
  "metadata": {
    "abstract_canon_sha256": "9595602fc671b02f520e40a6a5eb2aa48c3d468c9714ab2e1a61d893e5d41b48",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-05-15T03:59:02Z",
    "title_canon_sha256": "183a9a78dea911a90374b4eaa5918a0dc607792bc4615646708f77871a059ec9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9805201",
    "kind": "arxiv",
    "version": 1
  }
}