Probing the Type 3 interacting dark-energy model using matter pairwise velocity
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918428964552704 |
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| author | Luo, Kin Ho Chu, Ming-chung Zhang, Wangzheng |
| author_facet | Luo, Kin Ho Chu, Ming-chung Zhang, Wangzheng |
| contents | Dark sector interactions can be explored via the so-called Type 3 model where dark matter and dark energy exchange momentum only, so as to minimize deviations from the $Λ$CDM background expansion history. Using N-body simulations, we analyze the imprint of Type 3 model parameters, the momentum exchange coupling constant $β$ and the slope of scalar field potential $λ$, on large-scale structure observables, particularly the matter pairwise velocity statistics. We find that the effects of $β$ ($<0$) and $λ$ on the mean matter peculiar pairwise velocity and velocity dispersion are degenerate. Our results highlight the potential of velocity statistics as a probe of dark sector interactions and underscore the importance of disentangling $β$ and $λ$ in cosmological analyses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_04312 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing the Type 3 interacting dark-energy model using matter pairwise velocity Luo, Kin Ho Chu, Ming-chung Zhang, Wangzheng Cosmology and Nongalactic Astrophysics Dark sector interactions can be explored via the so-called Type 3 model where dark matter and dark energy exchange momentum only, so as to minimize deviations from the $Λ$CDM background expansion history. Using N-body simulations, we analyze the imprint of Type 3 model parameters, the momentum exchange coupling constant $β$ and the slope of scalar field potential $λ$, on large-scale structure observables, particularly the matter pairwise velocity statistics. We find that the effects of $β$ ($<0$) and $λ$ on the mean matter peculiar pairwise velocity and velocity dispersion are degenerate. Our results highlight the potential of velocity statistics as a probe of dark sector interactions and underscore the importance of disentangling $β$ and $λ$ in cosmological analyses. |
| title | Probing the Type 3 interacting dark-energy model using matter pairwise velocity |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2508.04312 |