Correspondence between a decaying dark matter sector scenario and scalar field model
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915971716874240 |
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| author | Aguilar-Pérez, Gilberto Alvarado, Deryan Cruz, Miguel Ruíz-Ramos, Estefany Saavedra, Joel |
| author_facet | Aguilar-Pérez, Gilberto Alvarado, Deryan Cruz, Miguel Ruíz-Ramos, Estefany Saavedra, Joel |
| contents | We explore the theoretical viability of modeling a decaying dark matter sector through a unified scalar field approach. Using exact analytical solutions of the Friedmann constraints, we map the fluid phenomenology onto a scalar field potential. Our analysis reveals that physical viability, specifically the existence of a well-defined potential minimum; inevitably forces the dark energy equation of state into the phantom domain. To resolve the kinetic pathologies at late times, we propose reinterpreting the framework within a complex scenario, mapping the imaginary transition to the angular dynamics of a $U(1)$ phase. This mapping naturally yields an ultra-light mass scale of $m_ϕ\sim 10^{-33} \ \text{eV}$, classifying the model as a unified dark fluid. Finally, we employ a dynamical approach to study the effects of non-minimal coupling, proving that the phantom-dominated epoch acts as a stable, late-time cosmic attractor in this kind of cosmological scenario. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_00208 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Correspondence between a decaying dark matter sector scenario and scalar field model Aguilar-Pérez, Gilberto Alvarado, Deryan Cruz, Miguel Ruíz-Ramos, Estefany Saavedra, Joel Cosmology and Nongalactic Astrophysics We explore the theoretical viability of modeling a decaying dark matter sector through a unified scalar field approach. Using exact analytical solutions of the Friedmann constraints, we map the fluid phenomenology onto a scalar field potential. Our analysis reveals that physical viability, specifically the existence of a well-defined potential minimum; inevitably forces the dark energy equation of state into the phantom domain. To resolve the kinetic pathologies at late times, we propose reinterpreting the framework within a complex scenario, mapping the imaginary transition to the angular dynamics of a $U(1)$ phase. This mapping naturally yields an ultra-light mass scale of $m_ϕ\sim 10^{-33} \ \text{eV}$, classifying the model as a unified dark fluid. Finally, we employ a dynamical approach to study the effects of non-minimal coupling, proving that the phantom-dominated epoch acts as a stable, late-time cosmic attractor in this kind of cosmological scenario. |
| title | Correspondence between a decaying dark matter sector scenario and scalar field model |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2605.00208 |