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Two-Field Quintom Models in the w-w' Plane
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Two-Field Quintom Models in the w-w' Plane
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The w-w' plane, defined by the equation of state parameter for the dark energy and its derivative with respect to the logarithm of the scale factor, is useful to the study of classifying the dynamical dark energy models. In this note, we examine the evolving behavior of the two-field quintom models with w crossing the w=-1 barrier in the w-w' plane. We find that these models can be divided into two categories, type A quintom in which w changes from >-1 to <-1 and type B quintom in which w changes from <-1 to >-1 as the universe expands.
Forward citations
Cited by 3 Pith papers
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UV-complete and stable Quintom Dark Energy models in the light of DESI DR2
Quintom dark energy is UV-completed in 5D NPGHU, producing a modified Quintom-B model whose massive gauge ghost fits DESI with negligible fine-tuning and remains stable for Λ ~ O(10)H0.
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UV-complete and stable Quintom Dark Energy models in the light of DESI DR2
A 5D lattice gauge model is presented as the first UV-completion of Quintom dark energy, claiming DESI-compatible phantom crossing with stability, but the model's field amplitude makes its dark-energy density negligible.
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Quintom Model Perturbations
A two-field quintom model reproduces w0waCDM perturbation features and is mildly favored over it in Bayesian fits to BAO, CMB, and SNIa data.
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