Evolving dark energy or dark matter with an evolving equation-of-state?
Xingang Chen, Abraham Loeb
Abstract
Abstract We show that the latest empirical constraints on cosmology, from a combination of DESI, CMB and supernova data, can be accounted for if a small component of dark matter has an evolving and oscillating equation of state within -1 < w < 1. From a fundamental physics perspective, this interpretation is more appealing than an evolving phantom dark energy with w < -1, which violates the null energy condition.
Topics & Concepts
Dark energyPhysicsEquation of stateCosmic microwave backgroundDark fluidCosmologyDark matterAstrophysicsScalar field dark matterLambda-CDM modelHot dark matterSupernovaTheoretical physicsQuantum mechanicsAnisotropyCosmology and Gravitation TheoriesDark Matter and Cosmic PhenomenaParticle physics theoretical and experimental studies