Kinetic coupled tachyon: A dynamical system analysis
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866910766203928576 |
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| author | Pace, Francesco Rozas-Fernández, Alberto Türker, Özgen Tunç |
| author_facet | Pace, Francesco Rozas-Fernández, Alberto Türker, Özgen Tunç |
| contents | We present and examine a kinetically coupled tachyon dark energy model, where a tachyon scalar field interacts with the matter sector. More specifically, we deduce this cosmological setting from a generalised interacting dark energy model that allows for the kinetic term of the scalar field to couple to the matter species a priori in the action. A thorough dynamical system analysis and its cosmological implications unveil the appearance of a scaling solution which is also an attractor of the system, thanks to a novel critical point, with a period of accelerated expansion thereafter. This new solution, not present in the uncoupled case, has the enticing consequence of alleviating the coincidence problem. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_20118 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Kinetic coupled tachyon: A dynamical system analysis Pace, Francesco Rozas-Fernández, Alberto Türker, Özgen Tunç General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics We present and examine a kinetically coupled tachyon dark energy model, where a tachyon scalar field interacts with the matter sector. More specifically, we deduce this cosmological setting from a generalised interacting dark energy model that allows for the kinetic term of the scalar field to couple to the matter species a priori in the action. A thorough dynamical system analysis and its cosmological implications unveil the appearance of a scaling solution which is also an attractor of the system, thanks to a novel critical point, with a period of accelerated expansion thereafter. This new solution, not present in the uncoupled case, has the enticing consequence of alleviating the coincidence problem. |
| title | Kinetic coupled tachyon: A dynamical system analysis |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2412.20118 |