Constraining $μ$ and $y$ distortions in the Cosmic Microwave Background with COBE/FIRAS Data
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866915006018224128 |
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| author | Dhal, Somita Konar, Koustav Paul, R. K. |
| author_facet | Dhal, Somita Konar, Koustav Paul, R. K. |
| contents | This paper presents a novel approach to constrain the $μ$- and y- distortions in the Cosmic Microwave Background (CMB) using the COBE/FIRAS data. The analysis draws from the concept of blackbody radiation inversion (BRI), a mathematical technique typically used to determine the temperature distribution from a radiated power spectrum. We study the deviations from the ideal blackbody spectrum or the spectral distortions by incorporating first a non-zero chemical potential $μ$ via the Bose-Einstein distribution and then the Compton parameter $y$ while keeping the monopole temperature constant. We infer the results as probability distribution functions on these distortions. Finally, we derive $μ= (8.913 \pm 0.736) \times 10^{-5}$ and $y = (1.532 \pm 0.092) \times 10^{-5}$ at a $68\%$ confidence interval. The results are consistent with prior values and provide tighter constraints on the CMB spectral distortion and synergies of the primordial Universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_03056 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Constraining $μ$ and $y$ distortions in the Cosmic Microwave Background with COBE/FIRAS Data Dhal, Somita Konar, Koustav Paul, R. K. Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics This paper presents a novel approach to constrain the $μ$- and y- distortions in the Cosmic Microwave Background (CMB) using the COBE/FIRAS data. The analysis draws from the concept of blackbody radiation inversion (BRI), a mathematical technique typically used to determine the temperature distribution from a radiated power spectrum. We study the deviations from the ideal blackbody spectrum or the spectral distortions by incorporating first a non-zero chemical potential $μ$ via the Bose-Einstein distribution and then the Compton parameter $y$ while keeping the monopole temperature constant. We infer the results as probability distribution functions on these distortions. Finally, we derive $μ= (8.913 \pm 0.736) \times 10^{-5}$ and $y = (1.532 \pm 0.092) \times 10^{-5}$ at a $68\%$ confidence interval. The results are consistent with prior values and provide tighter constraints on the CMB spectral distortion and synergies of the primordial Universe. |
| title | Constraining $μ$ and $y$ distortions in the Cosmic Microwave Background with COBE/FIRAS Data |
| topic | Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2411.03056 |