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Phantom crossing dark energy in Horndeski's theory
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abstract
The $\Lambda$CDM model is a remarkably successful model which is consistent with the observations of cosmic microwave background radiation (CMB), baryon acoustic oscillation (BAO), and large scale structure of the Universe. However, the discrepancy in the value of $H_0$ between the local observations and PLANCK observation of CMB was recently pointed out. One of the way to ease the discrepancy is to introduce phantom dark energy instead of the cosmological constant. While, phantom dark energy often suffer from the instabilities. We will investigate the general solution to overcome the difficulty of phantom dark energy and construct some particular models which have a phantom crossing and can be consistent with the observations.
Forward citations
Cited by 5 Pith papers
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Exploring cosmological imprints of phantom crossing with dynamical dark energy in Horndeski gravity
A Horndeski scalar-field dark energy model that crosses the phantom divide and has negative early-time energy density fits cosmological data as well as LambdaCDM but does not resolve the main tensions.
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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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DESI and SNe: Dynamical Dark Energy, $\Omega_m$ Tension or Systematics?
Reconstructing Ωm from DESI's w0waCDM fits shows an SNe-driven low-redshift departure from ΛCDM, with a 3.4σ disagreement between a DES supernova subsample and DESI full-shape clustering at the same effective redshift.
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The Quintom theory of dark energy after DESI DR2
This review traces the history of dynamical dark energy, presents the no-go theorem against single-field crossing of w = -1, and surveys viable Quintom constructions including multi-field models and modified gravity i...
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A short review on Quintom dark energy theory
Quintom dark energy models permit the equation of state to cross w=-1, supporting bouncing cosmologies and CMB-based tests of dark energy nature.
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