Uplifting, Depressing, and Tilting Dark Energy

2025/06/02 by Eric V. Linder, Linder, Eric V. · 8 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Pulsars and Gravitational Waves Research #Dark Matter and Cosmic Phenomena

paper · pdf · doi:10.48550/arxiv.2506.02122

Abstract

Current data in the form of baryon acoustic oscillation, supernova, and cosmic microwave background distances prefer a cosmology that accelerates more strongly than ΛCDM at z≈0.5-1.5, and more weakly at z\lesssim0.5. We examine dark energy physics that can accommodate this, showing that interactions (decays, coupling to matter, nonminimal coupling to gravity) fairly generically tend not to give a satisfactory solution (in terms of fitting both distances and growth) even if they enable the effective dark energy equation of state to cross w=-1. To fit the cosmological data it appears the dark energy by itself must cross w=-1, a highly unusual physical behavior.

Cited by

• Cosmology after Phantom Crossing by Horndeski Gravity
• Null Impact of the Null Energy Condition in Current Cosmology
• Unified dark sector approaches to cosmological tensions
• Cosmological constraints on Galileon dark energy with broken shift symmetry
• Lowering the Horizon on Dark Energy: A Late-Time Response to Early Solutions for the Hubble Tension
• Looking beyond lambda
• Persistent and serious challenge to the ΛCDM throne: Evidence for dynamical dark energy rising from combinations of different types of datasets
• Phantom crossing or dark interaction?

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