To curve, or not to curve: Is curvature-assisted quintessence observationally viable?
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866917885847273472 |
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| author | Alestas, George Delgado, Matilda Ruiz, Ignacio Akrami, Yashar Montero, Miguel Nesseris, Savvas |
| author_facet | Alestas, George Delgado, Matilda Ruiz, Ignacio Akrami, Yashar Montero, Miguel Nesseris, Savvas |
| contents | Single-field models of accelerated expansion with nearly flat potentials, despite being able to provide observationally viable explanations for the early-time cosmic inflation and the late-time cosmic acceleration, are in strong tension with string theory evidence and the associated de Sitter swampland constraints. It has recently been argued that in an open universe, where the spatial curvature is negative (i.e., with $Ω_k>0$), a new stable fixed point arises, which may lead to viable single-field-based accelerated expansion with an arbitrarily steep potential. Here, we show, through a dynamical systems analysis and a Bayesian statistical inference of cosmological parameters, that the additional cosmological solutions based on the new fixed point do not render steep-potential, single-field, accelerated expansion observationally viable. We mainly focus on quintessence models of dark energy, but we also argue that a similar conclusion can be drawn for cosmic inflation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_09212 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | To curve, or not to curve: Is curvature-assisted quintessence observationally viable? Alestas, George Delgado, Matilda Ruiz, Ignacio Akrami, Yashar Montero, Miguel Nesseris, Savvas High Energy Physics - Theory Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology Single-field models of accelerated expansion with nearly flat potentials, despite being able to provide observationally viable explanations for the early-time cosmic inflation and the late-time cosmic acceleration, are in strong tension with string theory evidence and the associated de Sitter swampland constraints. It has recently been argued that in an open universe, where the spatial curvature is negative (i.e., with $Ω_k>0$), a new stable fixed point arises, which may lead to viable single-field-based accelerated expansion with an arbitrarily steep potential. Here, we show, through a dynamical systems analysis and a Bayesian statistical inference of cosmological parameters, that the additional cosmological solutions based on the new fixed point do not render steep-potential, single-field, accelerated expansion observationally viable. We mainly focus on quintessence models of dark energy, but we also argue that a similar conclusion can be drawn for cosmic inflation. |
| title | To curve, or not to curve: Is curvature-assisted quintessence observationally viable? |
| topic | High Energy Physics - Theory Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2406.09212 |