Cosmic acceleration driven by dark matter self-interactions: a phenomenological treatment
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2019
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| _version_ | 1866908310021603328 |
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| author | Çamlıbel, A. Kazım |
| author_facet | Çamlıbel, A. Kazım |
| contents | We explore the idea that cosmic acceleration may be a byproduct of late-time effects like structure formation in two steps. First, we consider the equation of state for an inhomogeneous cosmic fluid, which may lead to a Gedanken-model for cosmic evolution, where dark matter is strongly self-interacting and stays in a plasma state until late stages of the cosmic evolution. After decoupling, it condensates to super-structures with cosmic voids similar to the current picture of the universe, introducing a negative pressure term in relation to self-interaction strength. Secondly, we carry out a cosmological analysis inspired by this scenario via a phenomenological ansatz that exhibits a transient behavior. In this analysis, we use the recent Type Ia supernova compilation and high redshift quasar data and compare the results to that of $Λ$CDM. It turns out that proposed model can solve the quasar Hubble diagram tension. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1904_01867 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Cosmic acceleration driven by dark matter self-interactions: a phenomenological treatment Çamlıbel, A. Kazım General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics We explore the idea that cosmic acceleration may be a byproduct of late-time effects like structure formation in two steps. First, we consider the equation of state for an inhomogeneous cosmic fluid, which may lead to a Gedanken-model for cosmic evolution, where dark matter is strongly self-interacting and stays in a plasma state until late stages of the cosmic evolution. After decoupling, it condensates to super-structures with cosmic voids similar to the current picture of the universe, introducing a negative pressure term in relation to self-interaction strength. Secondly, we carry out a cosmological analysis inspired by this scenario via a phenomenological ansatz that exhibits a transient behavior. In this analysis, we use the recent Type Ia supernova compilation and high redshift quasar data and compare the results to that of $Λ$CDM. It turns out that proposed model can solve the quasar Hubble diagram tension. |
| title | Cosmic acceleration driven by dark matter self-interactions: a phenomenological treatment |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/1904.01867 |