Why reducing the cosmic sound horizon alone can not fully resolve the Hubble tension
By K. Jedamzik, Levon Pogosian, Gong-Bo Zhao. Communications Physics, 2020
199 citations recorded by the source corpus.
The mismatch between the locally measured expansion rate of the universe and the one inferred from the cosmic microwave background measurements by Planck in the context of the standard ΛCDM, known as the Hubble tension, has become one of the most pressing problems in cosmology. A large number of amendments to the ΛCDM model have been proposed in order to solve this tension. Many of them introduce new physics, such as early dark energy, modifications of the standard model neutrino sector, extra radiation, primordial magnetic fields or varying fundamental constants, with the aim of reducing the sound horizon at recombination r⋆. We demonstrate here that any model which only reduces r⋆ can never fully resolve the Hubble tension while remaining consistent with other cosmological datasets. We show explicitly that models which achieve a higher Hubble constant with lower values of matter density Ωmh2 run into tension with the observations of baryon acoustic oscillations, while models with larger Ωmh2 develop tension with galaxy weak lensing data. It is generally accepted that the Universe is dominated by dark energy but the different methods to measure the Hubble constant disagree, giving origin to what is known as the "Hubble tension”. The authors demonstrate that the sole reduction of the sound horizon is not sufficient to fully resolve the Hubble tension.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/4bac0352cc526e7e5c6ec1b182495e2b9d19eac3
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Citations in the corpus
- The Ups and Downs of Early Dark Energy solutions to the Hubble tension: A review of models, hints and constraints circa 2023 (2023, background): “[223] Karsten Jedamzik, Levon Pogosian, and Gong-Bo Zhao, “Why reducing the cosmic sound horizon alone can not fully resolve the Hubble tension,” Commun.”