Forecasts for interacting dark energy with time-dependent momentum exchange
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912671302942720 |
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| author | Cruickshank, Nathan Crittenden, Robert Koyama, Kazuya Bruni, Marco |
| author_facet | Cruickshank, Nathan Crittenden, Robert Koyama, Kazuya Bruni, Marco |
| contents | Models of interacting dark energy and dark matter offer a possible solution to cosmological tensions. In this work, we examine a pure momentum-exchange model with a time-dependent coupling strength $ξ(z)$ that could help to alleviate the $S_8$ tension. We perform Fisher forecasting and MCMC analysis to constrain the coupling strength of this interaction for different redshift bins $0.0<z<2.1$, using the specifications of upcoming DESI-like surveys. For this analysis, we examine both a model with a constant equation of state $w=-0.9$, as well as a thawing dark energy model with an evolving $w(z)$. We show that, for a constant equation of state, $ξ(z)$ can be well constrained in all redshift bins. However, due to a weaker effect at early times, the constraints are significantly reduced at high redshifts in the case of a thawing $w(z)$ model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_03555 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Forecasts for interacting dark energy with time-dependent momentum exchange Cruickshank, Nathan Crittenden, Robert Koyama, Kazuya Bruni, Marco Cosmology and Nongalactic Astrophysics Models of interacting dark energy and dark matter offer a possible solution to cosmological tensions. In this work, we examine a pure momentum-exchange model with a time-dependent coupling strength $ξ(z)$ that could help to alleviate the $S_8$ tension. We perform Fisher forecasting and MCMC analysis to constrain the coupling strength of this interaction for different redshift bins $0.0<z<2.1$, using the specifications of upcoming DESI-like surveys. For this analysis, we examine both a model with a constant equation of state $w=-0.9$, as well as a thawing dark energy model with an evolving $w(z)$. We show that, for a constant equation of state, $ξ(z)$ can be well constrained in all redshift bins. However, due to a weaker effect at early times, the constraints are significantly reduced at high redshifts in the case of a thawing $w(z)$ model. |
| title | Forecasts for interacting dark energy with time-dependent momentum exchange |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.03555 |