Phantom Crossing with Quintom Models

Abstract

We develop a two-scalar field quintom model, which utilises both a quintessence-like and a phantom-like scalar field, enabling a smooth and stable transition across the $w=-1$ phantom divide as hinted by recent measurements of Baryonic Acoustic Oscillations (BAO) by the Dark Energy Spectroscopic Instrument (DESI) Data Release 2. We explore a range of initial conditions and potential configurations that facilitate such a phantom-to-quintessence-like crossing, and find that this can be naturally realised with hill-top or cliff-face potentials bound from above. We study how varying these conditions affects the dynamics of the system, calculate the background observables and compare them with DESI, CMB, and Type Ia supernova data, identifying a viable parameter space for our model. In particular, we find that a potential featuring a hyperbolic tangent form can successfully reproduce the desired phantom crossing, although such models can suffer from fine-tuning effects. Finally, we discuss prospects for distinguishing such models with upcoming state-of-the-art cosmological observations.

Submitted to MNRAS, comments welcome

References in corpus (27)

• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• Cosmology and the Fate of Dilatation Symmetry
• Quintom Cosmology: Theoretical implications and observations
• Cosmological Evolution of a Quintom Model of Dark Energy
• Can dark energy evolve to the Phantom?
• Euclid. I. Overview of the Euclid mission
• Quantum effects can render w<-1 on cosmological scales
• A Parameterized Post-Friedmann Framework for Modified Gravity
• Crossing the Phantom Divide: Dark Energy Internal Degrees of Freedom
• Perturbations of the Quintom Models of Dark Energy and the Effects on Observations
• Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy
• Is the Hubble tension a hint of AdS phase around recombination?
• Crossing of the w=-1 Barrier by D3-brane Dark Energy Model
• Dark-Energy Evolution Across the Cosmological-Constant Boundary
• LiteBIRD: JAXA's new strategic L-class mission for all-sky surveys of cosmic microwave background polarization
• Interpreting DESI's evidence for evolving dark energy
• Two-Field Quintom Models in the w-w' Plane
• Constraints on Oscillating Quintom from Supernova, Microwave Background and Galaxy Clustering
• Exactly Solvable SFT Inspired Phantom Model
• Quintom cosmology and modified gravity after DESI 2024
• Construction of Exact Solutions in Two-Fields Models and the Crossing of the Cosmological Constant Barrier
• $f(T)$ gravity after DESI Baryon Acoustic Oscillation and DES Supernovae 2024 data
• Weak lensing and dark energy: the impact of dark energy on nonlinear dark matter clustering
• The Quintom theory of dark energy after DESI DR2
• Resolving the Planck-DESI tension by nonminimally coupled quintessence
• Reconstructing quintom from WMAP 5-year observations: Generalized ghost condensate
• Phantom Crossing and Oscillating Dark Energy with $F(R)$ Gravity