Cosmological tensions and $\mathcal{Q}_{\rm CDM}$ as an alternative to $Λ$CDM
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866909536177094656 |
|---|---|
| author | Aboubrahim, Amin Nath, Pran |
| author_facet | Aboubrahim, Amin Nath, Pran |
| contents | The Standard Model of cosmology, $Λ$CDM, while enormously successful, is currently unable to account for several cosmological anomalies the most prominent of which are in the measurements of the Hubble parameter and $S_8$. Additionally, the inclusion of the cosmological constant is theoretically unappealing. This has lead to extensions of the model such as the use of fluid equations for interacting dark matter and dark energy which, however, are ad hoc since they do not appear to arise from a Lagrangian. Recently, we have proposed $\mathcal{Q}_{\rm CDM}$ as an alternative to $Λ$CDM which is a dynamical model of a quintessence field interacting with dark matter within a field theoretic approach. In this approach, we analyze the effect of the dark matter mass, the dark matter-dark energy interaction strength and the dark matter self-interaction on the cosmological parameters. Further, within $\mathcal{Q}_{\rm CDM}$ we investigate the possible alleviation of the Hubble tension and the $S_8$ anomaly and the nature of dark energy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_09769 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmological tensions and $\mathcal{Q}_{\rm CDM}$ as an alternative to $Λ$CDM Aboubrahim, Amin Nath, Pran Cosmology and Nongalactic Astrophysics The Standard Model of cosmology, $Λ$CDM, while enormously successful, is currently unable to account for several cosmological anomalies the most prominent of which are in the measurements of the Hubble parameter and $S_8$. Additionally, the inclusion of the cosmological constant is theoretically unappealing. This has lead to extensions of the model such as the use of fluid equations for interacting dark matter and dark energy which, however, are ad hoc since they do not appear to arise from a Lagrangian. Recently, we have proposed $\mathcal{Q}_{\rm CDM}$ as an alternative to $Λ$CDM which is a dynamical model of a quintessence field interacting with dark matter within a field theoretic approach. In this approach, we analyze the effect of the dark matter mass, the dark matter-dark energy interaction strength and the dark matter self-interaction on the cosmological parameters. Further, within $\mathcal{Q}_{\rm CDM}$ we investigate the possible alleviation of the Hubble tension and the $S_8$ anomaly and the nature of dark energy. |
| title | Cosmological tensions and $\mathcal{Q}_{\rm CDM}$ as an alternative to $Λ$CDM |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.09769 |