Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features
The primary purpose of this paper is to see how well a recently proposed new model fits (a) the position of the baryon acoustic oscillation (BAO) features observed in the large-scale distribution of galaxies and (b) the angular size measured for the sound horizon due to BAO imprinted in the cosmic m...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad1bc6 |
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| author | Rajendra P. Gupta |
| author_facet | Rajendra P. Gupta |
| author_sort | Rajendra P. Gupta |
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| description | The primary purpose of this paper is to see how well a recently proposed new model fits (a) the position of the baryon acoustic oscillation (BAO) features observed in the large-scale distribution of galaxies and (b) the angular size measured for the sound horizon due to BAO imprinted in the cosmic microwave background (CMB) anisotropy. The new model is a hybrid model that combines the tired light (TL) theory with a variant of the ΛCDM model in which the cosmological constant is replaced with a covarying coupling constants’ (CCC) parameter α . This model, dubbed the CCC+TL model, can fit the Type Ia supernovae Pantheon+ data as accurately as the ΛCDM model, and also fit the angular size of cosmic dawn galaxies observed by the James Webb Space Telescope, which is in tension with the ΛCDM model. The results we obtained are 151.0 (±5.1) Mpc for the absolute BAO scale at the current epoch, and the angular size of the sound horizon θ _sh = 0.°60, matching Planck’s observations at the surface of the last scattering when the baryon density is set to 100% of the matter density and ∣ α ∣ is increased by 5.6%. It remains to be seen if the new model is consistent with the CMB power spectrum, the Big Bang nucleosynthesis of light elements, and other critical observations. |
| format | Article |
| id | doaj-art-6c23bc850c8c4516a34becdcf038f378 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj-art-6c23bc850c8c4516a34becdcf038f3782025-08-20T02:16:11ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0196415510.3847/1538-4357/ad1bc6Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation FeaturesRajendra P. Gupta0https://orcid.org/0000-0001-5423-2673Department of Physics, University of Ottawa , Ottawa, Canada ; rgupta4@uottawa.caThe primary purpose of this paper is to see how well a recently proposed new model fits (a) the position of the baryon acoustic oscillation (BAO) features observed in the large-scale distribution of galaxies and (b) the angular size measured for the sound horizon due to BAO imprinted in the cosmic microwave background (CMB) anisotropy. The new model is a hybrid model that combines the tired light (TL) theory with a variant of the ΛCDM model in which the cosmological constant is replaced with a covarying coupling constants’ (CCC) parameter α . This model, dubbed the CCC+TL model, can fit the Type Ia supernovae Pantheon+ data as accurately as the ΛCDM model, and also fit the angular size of cosmic dawn galaxies observed by the James Webb Space Telescope, which is in tension with the ΛCDM model. The results we obtained are 151.0 (±5.1) Mpc for the absolute BAO scale at the current epoch, and the angular size of the sound horizon θ _sh = 0.°60, matching Planck’s observations at the surface of the last scattering when the baryon density is set to 100% of the matter density and ∣ α ∣ is increased by 5.6%. It remains to be seen if the new model is consistent with the CMB power spectrum, the Big Bang nucleosynthesis of light elements, and other critical observations.https://doi.org/10.3847/1538-4357/ad1bc6CosmologyBaryon acoustic oscillationsCosmic microwave background radiation |
| spellingShingle | Rajendra P. Gupta Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features The Astrophysical Journal Cosmology Baryon acoustic oscillations Cosmic microwave background radiation |
| title | Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features |
| title_full | Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features |
| title_fullStr | Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features |
| title_full_unstemmed | Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features |
| title_short | Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features |
| title_sort | testing ccc tl cosmology with observed baryon acoustic oscillation features |
| topic | Cosmology Baryon acoustic oscillations Cosmic microwave background radiation |
| url | https://doi.org/10.3847/1538-4357/ad1bc6 |
| work_keys_str_mv | AT rajendrapgupta testingccctlcosmologywithobservedbaryonacousticoscillationfeatures |