Analyzing the 21-cm signal brightness temperature in the Universe with inhomogeneities
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866916373421096960 |
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| author | Pandey, Shashank Shekhar Halder, Ashadul Majumdar, A. S. |
| author_facet | Pandey, Shashank Shekhar Halder, Ashadul Majumdar, A. S. |
| contents | We explore the 21-cm signal in our Universe containing inhomogeneous matter distribution at considerably large scales. Employing Buchert's averaging procedure in the context of a model of spacetime with multiple inhomogeneous domains, we evaluate the effect of our model parameters on the observable 21-cm signal brightness temperature. Our model parameters are constrained through the Markov Chain Monte Carlo method using the Union 2.1 supernova Ia observational data. We find that a significant dip in the brightness temperature compared to the $Λ$CDM prediction could arise as an effect of the inhomogeneities present in the Universe. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_18757 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Analyzing the 21-cm signal brightness temperature in the Universe with inhomogeneities Pandey, Shashank Shekhar Halder, Ashadul Majumdar, A. S. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We explore the 21-cm signal in our Universe containing inhomogeneous matter distribution at considerably large scales. Employing Buchert's averaging procedure in the context of a model of spacetime with multiple inhomogeneous domains, we evaluate the effect of our model parameters on the observable 21-cm signal brightness temperature. Our model parameters are constrained through the Markov Chain Monte Carlo method using the Union 2.1 supernova Ia observational data. We find that a significant dip in the brightness temperature compared to the $Λ$CDM prediction could arise as an effect of the inhomogeneities present in the Universe. |
| title | Analyzing the 21-cm signal brightness temperature in the Universe with inhomogeneities |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2310.18757 |