Cosmological constraints on late-Universe decaying dark matter as a solution to the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>H</mml:mi><mml:mn>0</mml:mn></mml:msub></mml:math> tension
Steven J. Clark, Kyriakos Vattis, Savvas M. Koushiappas
Abstract
It has been suggested that late-Universe dark matter decays can alleviate the tension between measurements of ${H}_{0}$ in the local Universe and its value inferred from cosmic microwave background fluctuations. It has been suggested that decaying dark matter can potentially account for this discrepancy as it reshuffles the energy density between matter and radiation and as a result allows dark energy to become dominant at earlier times. In this work, we show that the low multipole amplitude of the cosmic microwave background anisotropy power spectrum severely constrains the feasibility of late-time decays as a solution to the ${H}_{0}$ tension.
Topics & Concepts
PhysicsCosmic microwave backgroundDark matterDark energyUniverseMultipole expansionCosmic background radiationCold dark matterCosmologyAmplitudeAnisotropyAstrophysicsParticle physicsQuantum mechanicsCosmology and Gravitation TheoriesDark Matter and Cosmic PhenomenaGalaxies: Formation, Evolution, Phenomena