Measuring the viscosity of dark matter with strongly lensed gravitational waves
Shuo Cao, Jing-Zhao Qi, Marek Biesiada, Tonghua Liu, Jin Li, Zong‐Hong Zhu
Abstract
ABSTRACT Based on the strongly lensed gravitational waves (GWs) from compact binary coalescence, we propose a new strategy to examine the fluid shear viscosity of dark matter (DM) in the GW domain, i.e. whether a GW experiences the damping effect when it propagates in DM fluid with nonzero shear viscosity. By assuming that the DM self-scatterings are efficient enough for the hydrodynamic description to be valid, our results demonstrate that future ground-based Einstein Telescope and satellite GW observatory (big bang observer) may succeed in detecting any DM self-interactions at the scales of galaxies and clusters.
Topics & Concepts
PhysicsDark matterGravitational waveEinstein TelescopeAstrophysicsCoalescence (physics)GalaxyObservatoryDark fluidGravitationAstronomyHot dark matterCosmologyDark energyCosmology and Gravitation TheoriesGalaxies: Formation, Evolution, PhenomenaDark Matter and Cosmic Phenomena