Pith. sign in

REVIEW 1 cited by

The Dark Energy Survey Supernova Program: Slow supernovae show cosmological time dilation out to z sim 1

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 2406.05050 v2 pith:ZIYGUODV submitted 2024-06-07 astro-ph.CO astro-ph.HE

The Dark Energy Survey Supernova Program: Slow supernovae show cosmological time dilation out to $z \sim 1$

R. M. T. White , T. M. Davis , G. F. Lewis , D. Brout , L. Galbany , K. Glazebrook , S. R. Hinton , J. Lee
show 62 more authors
C. Lidman A. M\"oller M. Sako D. Scolnic M. Smith M. Sullivan B. O. S\'anchez P. Shah M. Vincenzi P. Wiseman T. M. C. Abbott M. Aguena S. Allam F. Andrade-Oliveira J. Asorey D. Bacon S. Bocquet D. Brooks E. Buckley-Geer D. L. Burke A. Carnero Rosell D. Carollo J. Carretero L. N. da Costa M. E. S. Pereira J. De Vicente S. Desai H. T. Diehl S. Everett I. Ferrero B. Flaugher J. Frieman J. Garc\'ia-Bellido E. Gaztanaga G. Giannini R. A. Gruendl D. L. Hollowood K. Honscheid D. J. James R. Kessler K. Kuehn O. Lahav S. Lee M. Lima J. L. Marshall J. Mena-Fern\'andez R. Miquel J. Myles R. C. Nichol R. L. C. Ogando A. Palmese A. Pieres A. A. Plazas Malag\'on A. K. Romer E. Sanchez D. Sanchez Cid M. Schubnell E. Suchyta G. Tarle B. E. Tucker A. R. Walker N. Weaverdyck (for the DES Collaboration)
This is my paper
classification astro-ph.CO astro-ph.HE
keywords lightdilationsupernovaetimecosmologicalcurvesdeltafind
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
0 comments
Share X Bluesky LinkedIn Reddit HN
abstract

We present a precise measurement of cosmological time dilation using the light curves of 1504 type Ia supernovae from the Dark Energy Survey spanning a redshift range $0.1\lesssim z\lesssim 1.2$. We find that the width of supernova light curves is proportional to $(1+z)$, as expected for time dilation due to the expansion of the Universe. Assuming type Ia supernovae light curves are emitted with a consistent duration $\Delta t_{\rm em}$, and parameterising the observed duration as $\Delta t_{\rm obs}=\Delta t_{\rm em}(1+z)^b$, we fit for the form of time dilation using two methods. Firstly, we find that a power of $b \approx 1$ minimises the flux scatter in stacked subsamples of light curves across different redshifts. Secondly, we fit each target supernova to a stacked light curve (stacking all supernovae with observed bandpasses matching that of the target light curve) and find $b=1.003\pm0.005$ (stat) $\pm\,0.010$ (sys). Thanks to the large number of supernovae and large redshift-range of the sample, this analysis gives the most precise measurement of cosmological time dilation to date, ruling out any non-time-dilating cosmological models at very high significance.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Alleviating the Hubble Tension via Cosmological Time Dilation in the meVSL Model

    physics.gen-ph 2025-09 reject novelty 3.0

    The meVSL model's parameter b reduces the baryon drag sound horizon, raising inferred H0, and changes the cosmological time-dilation exponent to n=1-b/4; the paper forecasts SN sample sizes to detect this.