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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| Acceso en línea: | https://arxiv.org/abs/2308.05165 |
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| _version_ | 1866914957193379840 |
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| author | Santana, Z. C. Holanda, R. F. L. Silva, R. |
| author_facet | Santana, Z. C. Holanda, R. F. L. Silva, R. |
| contents | In this paper, we investigate a potential departure in the standard dark matter density evolution law, $ρ_{dm} = ρ_{dm,0}(1+z)^3$. The method involves considering a deformed evolution model, denoted as $ρ_{dm} = ρ_{dm,0}(1+z)^3f(z)$, and searching the presence of any deviation ($f(z)\neq 1$). As one may see, $f(z)$ is a general function that parametrizes a possible digression from the standard law. We use data of baryon acoustic oscillations, type I Supernovae luminosity distances, and galaxy cluster gas mass fraction observations to reconstruct $f(z)$ through an approach that is not dependent on the cosmological model or the so-called Gaussian process regression. Unlike previous works, it enables us to investigate a possible deviation without using a specific function to describe it. We have obtained $f(z)=1$, the standard model scenario, within $2σ$ c.l. in all the considered cases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_05165 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Non-Parametric Analysis for the Dark Matter Density Evolution Santana, Z. C. Holanda, R. F. L. Silva, R. Cosmology and Nongalactic Astrophysics In this paper, we investigate a potential departure in the standard dark matter density evolution law, $ρ_{dm} = ρ_{dm,0}(1+z)^3$. The method involves considering a deformed evolution model, denoted as $ρ_{dm} = ρ_{dm,0}(1+z)^3f(z)$, and searching the presence of any deviation ($f(z)\neq 1$). As one may see, $f(z)$ is a general function that parametrizes a possible digression from the standard law. We use data of baryon acoustic oscillations, type I Supernovae luminosity distances, and galaxy cluster gas mass fraction observations to reconstruct $f(z)$ through an approach that is not dependent on the cosmological model or the so-called Gaussian process regression. Unlike previous works, it enables us to investigate a possible deviation without using a specific function to describe it. We have obtained $f(z)=1$, the standard model scenario, within $2σ$ c.l. in all the considered cases. |
| title | Non-Parametric Analysis for the Dark Matter Density Evolution |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2308.05165 |