Radial Coherential Dynamics as Ghost-Free Hilltop Quintessence: FRW Solutions and Observational Constraints RCD Hilltop Dark Energy Series — Paper I
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| Format: | Recurso digital |
| Langue: | anglais |
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2026
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| _version_ | 1866901498629193728 |
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| author | Cerezo, Arturo |
| author_facet | Cerezo, Arturo |
| contents | <p>Paper I of the RCD Hilltop Dark Energy Series. We investigate the cosmological dynamics of a scalar field model motivated by Radial Coherential Dynamics (RCD), in which a coherence parameter C ∈ (0,1) evolves with a non-canonical kinetic coupling K(C) = (1−C)² and a symmetric potential V(C) = vC(1−C). Working in the ghost-free convention with positive-definite kinetic energy, we establish that the model belongs to the class of k-essence theories linear in X, with sound speed c²_s = 1 identically. We demonstrate that C = 1/2 is an unstable equilibrium of the potential. For initial conditions C₀ ∈ [0.42, 0.51] near the hilltop, the model produces viable dark energy with w₀ ∈ [−1.00, −0.81] and Ω_DE ≈ 0.685, placing it in the thawing quintessence class.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_18665142 |
| institution | Zenodo |
| language | eng |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Radial Coherential Dynamics as Ghost-Free Hilltop Quintessence: FRW Solutions and Observational Constraints RCD Hilltop Dark Energy Series — Paper I Cerezo, Arturo dark energy quintessence scalar field cosmology Radial Coherential Dynamics Caldeira-Leggett hilltop potential equation of state RCD <p>Paper I of the RCD Hilltop Dark Energy Series. We investigate the cosmological dynamics of a scalar field model motivated by Radial Coherential Dynamics (RCD), in which a coherence parameter C ∈ (0,1) evolves with a non-canonical kinetic coupling K(C) = (1−C)² and a symmetric potential V(C) = vC(1−C). Working in the ghost-free convention with positive-definite kinetic energy, we establish that the model belongs to the class of k-essence theories linear in X, with sound speed c²_s = 1 identically. We demonstrate that C = 1/2 is an unstable equilibrium of the potential. For initial conditions C₀ ∈ [0.42, 0.51] near the hilltop, the model produces viable dark energy with w₀ ∈ [−1.00, −0.81] and Ω_DE ≈ 0.685, placing it in the thawing quintessence class.</p> |
| title | Radial Coherential Dynamics as Ghost-Free Hilltop Quintessence: FRW Solutions and Observational Constraints RCD Hilltop Dark Energy Series — Paper I |
| topic | dark energy quintessence scalar field cosmology Radial Coherential Dynamics Caldeira-Leggett hilltop potential equation of state RCD |
| url | https://doi.org/10.5281/zenodo.18665142 |