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The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration

Journal Article · · No journal information
OSTI ID:3005313
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  1. IP2I, Lyon; Southampton U.
  2. University Coll. London
  3. Stockholm U.; Stockholm U., OKC
  4. Chicago U., Astron. Astrophys. Ctr.; Chicago U., EFI; Chicago U., KICP
  5. Queensland U.
  6. Duke U.
  7. Oxford U.
  8. Southampton U.
  9. Australian Natl. U., Canberra (main)
  10. Cambridge U., KICC
  11. Harvard-Smithsonian Ctr. Astrophys.
  12. Fermilab
  13. Barcelona, IEEC; ICE, Bellaterra
  14. Baylor U.
  15. LPSC, Grenoble
  16. Pennsylvania U., Dept. Math.
  17. Swinburne U. Tech., Hawthorn
  18. Lancaster U.
  19. ICE, Bellaterra
  20. Zurich U.
  21. Madrid, CIEMAT; Madrid, Escuela Tec. Sup. Ing. Ind.
  22. Portsmouth U., ICG
  23. Northeastern U.
  24. Munich U. Observ.
  25. KIPAC, Menlo Park; SLAC
  26. IAC, La Laguna; LIneA, Rio de Janeiro
  27. Barcelona, IFAE
  28. Unlisted, US
  29. LIneA, Rio de Janeiro
  30. Hamburg Observ.
  31. Chicago U., Astron. Astrophys. Ctr.; Fermilab; Chicago U., EFI; Chicago U., KICP
  32. Caltech
  33. Madrid, IFT
  34. UC, Santa Cruz
  35. Ohio State U., CCAPP
  36. U. Michigan, Ann Arbor
  37. Australia, CSIRO, North Ryde
  38. Australia, CSIRO, North Ryde; Lowell Observ.
  39. ARC, Canberra; Australian Natl. U., Canberra (main)
  40. Texas A-M
  41. Illinois U., Urbana (main); Illinois U., Urbana, Astron. Dept.
  42. ICREA, Barcelona; Barcelona, IFAE
  43. Cincinnati U.; Perimeter Inst. Theor. Phys.
  44. Princeton U., Astrophys. Sci. Dept.
  45. Campinas State U.; Rio de Janeiro Observ.
  46. Madrid, CIEMAT; Madrid, Escuela Tec. Sup. Ing. Ind.; Ruhr U., Bochum
  47. Chicago U., Astron. Astrophys. Ctr.; Nordita; Royal Inst. Tech., Sodertalje
  48. U. Surrey (main)
  49. Sussex U., Astron. Ctr.
  50. Madrid, CIEMAT; Madrid, Escuela Tec. Sup. Ing. Ind.; Zurich U.
  51. ORNL, Oak Ridge (main); Illinois U., Urbana (main)
  52. Illinois U., Urbana (main)
  53. Chicago U., Astron. Astrophys. Ctr.
  54. Cerro-Tololo InterAmerican Obs.
  55. UC, Berkeley; LBL, Berkeley; LBNL, Berkeley
+ Show Author Affiliations
We present improved cosmological constraints from a re-analysis of the Dark Energy Survey (DES) 5-year sample of Type Ia supernovae (DES-SN5YR). This re-analysis includes an improved photometric cross-calibration, recent white dwarf observations to cross-calibrate between DES and low redshift surveys, retraining the SALT3 light curve model and fixing a numerical approximation in the host galaxy colour law. Our fully recalibrated sample, which we call DES-Dovekie, comprises $$\sim$$1600 likely Type Ia SNe from DES and $$\sim$$200 low-redshift SNe from other surveys. With DES-Dovekie, we obtain $$Ω_{\rm m} = 0.330 \pm 0.015$$ in Flat $$Λ$$CDM which changes $$Ω_{\rm m}$$ by $-0.022$ compared to DES-SN5YR. Combining DES-Dovekie with CMB data from Planck, ACT and SPT and the DESI DR2 measurements in a Flat $$w_0 w_a$$CDM cosmology, we find $$w_0 = -0.803 \pm 0.054$$, $$w_a = -0.72 \pm 0.21$$. Our results hold a significance of $3.2σ$, reduced from $4.2σ$ for DES-SN5YR, to reject the null hypothesis that the data are compatible with the cosmological constant. This significance is equivalent to a Bayesian model preference odds of approximately 5:1 in favour of the Flat $$w_0 w_a$$CDM model. Using generally accepted thresholds for model preference, our updated data exhibits only a weak preference for evolving dark energy.
Research Organization:
Duke U.; Portsmouth U., ICG; Perimeter Inst. Theor. Phys.; Northeastern U.; Madrid, Escuela Tec. Sup. Ing. Ind.; Barcelona, IFAE; Stockholm U.; Madrid, IFT; ARC, Canberra; Barcelona, IEEC; Baylor U.; Rio de Janeiro Observ.; Madrid, CIEMAT; LIneA, Rio de Janeiro; Stockholm U., OKC; Caltech; Ohio State U., CCAPP; Australia, CSIRO, North Ryde; Queensland U.; Zurich U.; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Illinois U., Urbana, Astron. Dept.; Royal Inst. Tech., Sodertalje; U. Surrey (main); Chicago U., Astron. Astrophys. Ctr.; Cerro-Tololo InterAmerican Obs.; Chicago U., KICP; Australian Natl. U., Canberra (main); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Cambridge U., KICC; IP2I, Lyon; U. Michigan, Ann Arbor; Lancaster U.; ICREA, Barcelona; Southampton U.; Campinas State U.; IAC, La Laguna; Nordita; Swinburne U. Tech., Hawthorn; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Harvard-Smithsonian Ctr. Astrophys.; Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Illinois U., Urbana (main); Pennsylvania U., Dept. Math.; Princeton U., Astrophys. Sci. Dept.; Lowell Observ.; Cincinnati U.; UC, Berkeley; Chicago U., EFI; LBNL, Berkeley; Unlisted, US; Hamburg Observ.; Munich U. Observ.; UC, Santa Cruz; Texas A-M; Ruhr U., Bochum; LPSC, Grenoble; ICE, Bellaterra; Oxford U.; Sussex U., Astron. Ctr.; University Coll. London
Sponsoring Organization:
US Department of Energy
DOE Contract Number:
89243024CSC000002
OSTI ID:
3005313
Report Number(s):
FERMILAB-PUB-25-0842-CSAID-PPD; oai:inspirehep.net:3081825; arXiv:2511.07517
Journal Information:
No journal information, Journal Name: No journal information
Country of Publication:
United States
Language:
English

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