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Title: DESI DR2 results. II. Measurements of baryon acoustic oscillations and cosmological constraints

Journal Article · · Physical Review. D.
DOI: https://doi.org/10.1103/tr6y-kpc6 · OSTI ID:3011041
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  1. Université Paris-Saclay
  2. Lawrence Berkeley National Laboratory
  3. Boston University
  4. Tata Institute of Fundamental Research
  5. NSF NOIRLab
  6. Universidad de La Laguna (ULL); Instituto de Astrofísica de Canarias
  7. University of Michigan
  8. University of Michigan; University of Michigan
  9. Universidad Nacional Autónoma de México; Instituto Avanzado de Cosmología A. C.
  10. Yale University
  11. Kansas State University
  12. University of Rochester
  13. Università degli Studi di Milano; INAF-Osservatorio Astronomico di Brera
  14. Swinburne University of Technology
  15. University of Edinburgh
  16. University College London
  17. University of Chicago; Fermi National Accelerator Laboratory
  18. Institute of Physics of the Czech Academy of Sciences
  19. University of Portsmouth
  20. Institut de Física d’Altes Energies (IFAE)
  21. Institut d’Estudis Espacials de Catalunya (IEEC); Institute of Space Sciences
  22. The Ohio State University
  23. Durham University
  24. National Tsing Hua University
  25. The University of Utah
  26. Universidad Nacional Autónoma de México
  27. CIEMAT
  28. San Diego State University; NSF NOIRLab
  29. University of Toronto; University of Pittsburgh
  30. University of Chinese Academy of Sciences
  31. University of California; University of California
  32. Center for Astrophysics | Harvard & Smithsonian
  33. Stanford University; SLAC National Accelerator Laboratory
  34. Instituto de Astrofísica de Andalucía (CSIC)
  35. Lawrence Berkeley National Laboratory; University of California
  36. Universidad de los Andes; Universidad de los Andes
  37. Flatiron Institute; Flatiron Institute
  38. Institut d’Estudis Espacials de Catalunya (IEEC); University of Portsmouth; Institute of Space Sciences
  39. Universitat de Barcelona; Institut d’Estudis Espacials de Catalunya (IEEC); Universitat de Barcelona (UB)
  40. Universidad de Guanajuato
  41. University of California
  42. Fermi National Accelerator Laboratory
  43. University of Cambridge; Lawrence Berkeley National Laboratory; University of California
  44. University of Arizona
  45. Institute of Physics
  46. Institut d’Astrophysique de Paris; Université Paris-Saclay
  47. The Ohio State University; The Ohio State University; The Ohio State University
  48. University of Queensland
  49. The University of Texas at Dallas
  50. The Ohio State University; The Ohio State University; The Ohio State University; The Ohio State University
  51. Southern Methodist University
  52. University of Edinburgh; University of Cambridge
  53. University of Waterloo; Perimeter Institute for Theoretical Physics; University of Waterloo
  54. Perimeter Institute for Theoretical Physics
  55. Astrophysics and Space Institute
  56. Sorbonne Université
  57. University of Toronto
  58. Korea Astronomy and Space Science Institute; University of Science and Technology
  59. Universitat Autònoma de Barcelona; Institut de Física d’Altes Energies (IFAE)
  60. Korea Astronomy and Space Science Institute
  61. Laboratoire de Physique Subatomique et de Cosmologie
  62. Institució Catalana de Recerca i Estudis Avançats; Institut de Física d’Altes Energies (IFAE)
  63. Siena College
  64. Aix Marseille Univ
  65. University of Wyoming
  66. University of Pittsburgh
  67. Universidad de Guanajuato; Instituto Avanzado de Cosmología A. C.
  68. Universidad Nacional Autónoma de México; Universidad Nacional Autónoma de México
  69. Université Paris-Saclay; Lawrence Berkeley National Laboratory
  70. Max Planck Institute for Extraterrestrial Physics
  71. Universitat Politècnica de Catalunya
  72. Lawrence Berkeley National Laboratory; University of California; University of California
  73. Université Clermont-Auvergne
  74. Université Paris-Saclay; Sorbonne Université
  75. Institute of Physics; Université Paris-Saclay
  76. University of California; University of California; University of California Observatories
  77. Sejong University
  78. Queensland University of Technology
  79. Abastumani Astrophysical Observatory; Kansas State University; Ilia State University
  80. Ohio University
  81. Durham University; Durham University
  82. Institució Catalana de Recerca i Estudis Avançats; Universitat de Barcelona (UB)
  83. Excellence Cluster ORIGINS; University Observatory
  84. The Ohio State University; The Ohio State University
  85. Shanghai Jiao Tong University
  86. University of Waterloo; University of Waterloo
  87. Tsinghua University
  88. Chinese Academy of Sciences; University of Chinese Academy of Sciences
  89. Chinese Academy of Sciences

We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), based on three years of operation. For cosmology inference, these galaxy measurements are combined with DESI Lyman-𝛼 forest BAO results presented in a companion paper (M. Abdul-Karim et al., companion paper, Phys. Rev. D 112, 083514 2025.). The DR2 BAO results are consistent with DESI DR1 and the Sloan Digital Sky Survey, and their distance-redshift relationship matches those from recent compilations of supernovae (SNe) over the same redshift range. The results are well described by a flat Λ cold dark matter (Λ⁢CDM) model, but the parameters preferred by BAO are in mild, 2.3⁢𝜎 tension with those determined from the cosmic microwave background (CMB), although the DESI results are consistent with the acoustic angular scale 𝜃* that is well measured by Planck. This tension is alleviated by dark energy with a time-evolving equation of state parametrized by 𝑤0 and 𝑤𝑎, which provides a better fit to the data, with a favored solution in the quadrant with 𝑤0 >−1 and 𝑤𝑎 <0. This solution is preferred over Λ ⁢CDM at 3.1⁢𝜎 for the combination of DESI BAO and CMB data. When also including SNe, the preference for a dynamical dark energy model over Λ⁢ CDM ranges from 2.8 − 4.2⁢𝜎 depending on which SNe sample is used. We present evidence from other data combinations which also favor the same behavior at high significance. From the combination of DESI and CMB we derive 95% upper limits on the sum of neutrino masses, finding ∑𝑚𝜈 < 0.064 eV assuming Λ ⁢CDM and ∑𝑚𝜈 < 0.16 eV in the 𝑤0⁢𝑤𝑎 model. Unless there is an unknown systematic error associated with one or more datasets, it is clear that Λ⁢ CDM is being challenged by the combination of DESI BAO with other measurements and that dynamical dark energy offers a possible solution.

Research Organization:
Boston University, MA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Harvard University, Cambridge, MA (United States); Ohio University, Athens, OH (United States); University of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
National Science Foundation (NSF); U.S. National Science Foundation (NSF), Division of Astronomical Sciences; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
DESI Collaboration
Grant/Contract Number:
89243024CSC000002; AC02-05CH11231; SC0007881; SC0016021; SC0019193; SC0023241
OSTI ID:
3011041
Report Number(s):
FERMILAB-PUB--25-0169-PPD
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 8 Vol. 112; ISSN 2470-0010; ISSN 2470-0029
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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