Testing CCC+TL Cosmology with Observed BAO Features
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910299951464448 |
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| author | Gupta, Rajendra P. |
| author_facet | Gupta, Rajendra P. |
| contents | The primary purpose of this paper is to see how well a recently proposed new model fits (a) the position of the baryon acoustic oscillations (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 supernovae type 1a 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 $151.0 (\pm5.1)$ 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 | Preprint |
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arxiv_https___arxiv_org_abs_2401_09483 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Testing CCC+TL Cosmology with Observed BAO Features Gupta, Rajendra P. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology The primary purpose of this paper is to see how well a recently proposed new model fits (a) the position of the baryon acoustic oscillations (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 supernovae type 1a 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 $151.0 (\pm5.1)$ 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. |
| title | Testing CCC+TL Cosmology with Observed BAO Features |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2401.09483 |