Imprints of MeV scale hidden dark sector at Planck data
New light species can contribute to the number of effective relativistic degrees of freedom (Neff) at Cosmic Microwave Background (CMB) which is precisely measured by Planck. In this work, we consider an MeV scale thermally decoupled non-minimal dark sector and study the imprint of the dark sector d...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-11-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269322005974 |
| _version_ | 1811250763659214848 |
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| author | Sougata Ganguly Sourov Roy Abhijit Kumar Saha |
| author_facet | Sougata Ganguly Sourov Roy Abhijit Kumar Saha |
| author_sort | Sougata Ganguly |
| collection | DOAJ |
| description | New light species can contribute to the number of effective relativistic degrees of freedom (Neff) at Cosmic Microwave Background (CMB) which is precisely measured by Planck. In this work, we consider an MeV scale thermally decoupled non-minimal dark sector and study the imprint of the dark sector dynamics on the measurement of Neff at the time of CMB formation. We have predicted the allowed region of model parameter space in the light of constraints arising from the measurements of both Neff and dark matter relic density by Planck. It turns out that the impact of the dark sector dynamics on Neff is significant in case of a non-hierarchical mass spectrum of the dark sector particles. |
| first_indexed | 2024-04-12T16:09:30Z |
| format | Article |
| id | doaj.art-ff72833c483c4ffa8b547956be80d16a |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-04-12T16:09:30Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-ff72833c483c4ffa8b547956be80d16a2022-12-22T03:25:58ZengElsevierPhysics Letters B0370-26932022-11-01834137463Imprints of MeV scale hidden dark sector at Planck dataSougata Ganguly0Sourov Roy1Abhijit Kumar Saha2School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Kolkata 700032, IndiaSchool of Physical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Kolkata 700032, IndiaCorresponding author.; School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Kolkata 700032, IndiaNew light species can contribute to the number of effective relativistic degrees of freedom (Neff) at Cosmic Microwave Background (CMB) which is precisely measured by Planck. In this work, we consider an MeV scale thermally decoupled non-minimal dark sector and study the imprint of the dark sector dynamics on the measurement of Neff at the time of CMB formation. We have predicted the allowed region of model parameter space in the light of constraints arising from the measurements of both Neff and dark matter relic density by Planck. It turns out that the impact of the dark sector dynamics on Neff is significant in case of a non-hierarchical mass spectrum of the dark sector particles.http://www.sciencedirect.com/science/article/pii/S0370269322005974 |
| spellingShingle | Sougata Ganguly Sourov Roy Abhijit Kumar Saha Imprints of MeV scale hidden dark sector at Planck data Physics Letters B |
| title | Imprints of MeV scale hidden dark sector at Planck data |
| title_full | Imprints of MeV scale hidden dark sector at Planck data |
| title_fullStr | Imprints of MeV scale hidden dark sector at Planck data |
| title_full_unstemmed | Imprints of MeV scale hidden dark sector at Planck data |
| title_short | Imprints of MeV scale hidden dark sector at Planck data |
| title_sort | imprints of mev scale hidden dark sector at planck data |
| url | http://www.sciencedirect.com/science/article/pii/S0370269322005974 |
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