Non-linear dark energy clustering

Abstract

We consider a dark energy fluid with arbitrary sound speed and equation of state and discuss the effect of its clustering on the cold dark matter distribution at the non-linear level. We write the continuity, Euler and Poisson equations for the system in the Newtonian approximation. Then, using the time renormalization group method to resum perturbative corrections at all orders, we compute the total clustering power spectrum and matter power spectrum. At the linear level, a sound speed of dark energy different from that of light modifies the power spectrum on observationally interesting scales, such as those relevant for baryonic acoustic oscillations. We show that the effect of varying the sound speed of dark energy on the non-linear corrections to the matter power spectrum is below the per cent level, and therefore these corrections can be well modelled by their counterpart in cosmological scenarios with smooth dark energy. We also show that the non-linear effects on the matter growth index can be as large as 10-15 per cent for small scales.

33 pages, 7 figures. Improved presentation. References added. Matches published version in JCAP

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• Constraints on modified gravity from the BOSS galaxy survey
• An effective description of dark matter and dark energy in the mildly non-linear regime
• Cosmic distance inference from purely geometric BAO methods: Linear Point standard ruler and Correlation Function Model Fitting
• Perturbative description of bias tracers using consistency relations of LSS
• Exact spherically-symmetric inhomogeneous model with n perfect fluids
• Redshift-space distortions in massive neutrino and evolving dark energy cosmologies
• Limits on Clustering and Smooth Quintessence from the EFTofLSS
• Full Investigation on the Dynamics of Power-Law Kinetic Quintessence
• A short review on clustering dark energy
• Nonlinear effects of dark energy clustering beyond the acoustic scales
• Nonlinear spherical perturbations in Quintessence Models of Dark Energy
• Tailoring cosmologies in cubic shift-symmetric Horndeski gravity
• Effects of tidal gravitational fields in clustering dark energy models
• On Observables in a Dark Matter-Clustering Quintessence System
• Efficient implementation of the Time Renormalization Group
• Unified dark fluid with null sound speed as an alternative to phantom dark energy
• Nonlinear power spectrum in clustering and smooth dark energy models beyond the BAO scale
• Non-linear Eulerian Hydrodynamics of Dark Energy: Riemann problem and Finite Volume Schemes
• Thermodynamic instability of dark energy equation of state
• Sound Mode and Scale-Dependent Growth in Two-Fluid Dynamical Dark Energy