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Revisiting purely kinetic k-essence

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arxiv 2501.14177 v2 pith:IQ6PRPVZ submitted 2025-01-24 gr-qc astro-ph.CO

Israel Quiros , Tame Gonzalez , Ulises Nucamendi , Roberto De Arcia , Francisco Antonio Horta Rangel This is my paper
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keywords cosmicdarkexplaink-essencekineticmodelspurelyadequate
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In this paper, we perform a dynamical systems study of the purely kinetic k-essence. Although these models have been studied in the past, a full study of the dynamics in the phase space incorporating the stability conditions for theoretical consistency is lacking. Our results confirm in a very rigorous and clear way that these models i) can not explain in a unified way the dark matter and dark energy components of the cosmic fluid and ii) are not adequate to explain the existing observational evidence, in particular the observed amount of cosmic structure.

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  1. Geometric formulation of $k$-essence and late-time acceleration

    gr-qc 2025-05 conditional novelty 6.0 of 10

    Integrable vectorial nonmetricity gravity is shown to be equivalent to purely kinetic quadratic k-essence, which fits late-time data as well as ΛCDM.

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