A Consistency Test of the Cosmological Model at the Epoch of Recombination Using DESI Baryonic Acoustic Oscillation and Planck Measurements - INSPIRE

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A Consistency Test of the Cosmological Model at the Epoch of Recombination Using DESI Baryonic Acoustic Oscillation and Planck Measurements

Levon Pogosian
(
- Simon Fraser U., Burnaby (main)
)
,
Gong-Bo Zhao
(
- NAOC, Beijing and
- Beijing, GUCAS and
- Beijing Normal U.
)
,
Karsten Jedamzik
(
- U. Montpellier 2, LUPM
)

May 30, 2024

6 pages

Published in:

Astrophys.J.Lett. 973 (2024) 1, L13

Published: Sep 16, 2024

e-Print:

2405.20306 [astro-ph.CO]

DOI:

10.3847/2041-8213/ad7507

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Abstract: (IOP)

The value of the Hubble constant determined from cosmic microwave background (CMB) and baryonic acoustic oscillation (BAO) measurements is directly dependent on the sound horizon at the photon–baryon decoupling. There has been significant interest in the possibility of new physics at the epoch around recombination that could reduce the sound horizon and increase the inferred value of H

_{0}

, thus helping to relieve the Hubble tension. One way to determine if new physics is required would be to measure H

_{0}

from BAO and CMB without assuming any model for computing the sound horizon. In this study, we use the recently released DESI Year 1 BAO data combined with the CMB acoustic scale and the Planck ΛCDM prior on Ω

_{m}

h

^{2}

to determine H

_{0}

while treating the sound horizon at baryon decoupling r

_{d}

as a free parameter. We find H

_{0}

= 69.48 ± 0.94 km s

^{−1}

Mpc

^{−1}

, which is ∼2σ larger than H

_{0}

= 67.44 ± 0.47 km s

^{−1}

Mpc

^{−1}

in the Planck best-fit ΛCDM where r

_{d}

is derived using the standard recombination model. For comparison, we perform the same analysis using the pre-DESI BAO data with the CMB acoustic scale and the same prior on Ω

_{m}

h

^{2}

, finding H

_{0}

= 68.05 ± 0.94 km s

^{−1}

Mpc

^{−1}

. This difference derives from the notably larger value of the product r

_{d}

h measured by DESI. We compare results obtained with and without including the Pantheon Plus sample of uncalibrated supernovae magnitudes in our analysis. Future BAO data from DESI will help determine if the cosmological model at the epoch of recombination model requires a modification.

Note:

6 pages, 2 figures, 1 table; added analysis with including the Pantheon+ SN sample, other minor changes in version 2; matches the version accepted to ApJLett

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