Simulating Momentum Exchange in the Dark Sector

Abstract

Low energy interactions between particles are often characterised by elastic scattering. Just as electrons undergo Thomson scattering with photons, dark matter particles may experience an analogous form of momentum exchange with dark energy. We investigate the influence such an interaction has on the formation of linear and nonlinear cosmic structure, by running for the first time a suite of N-body simulations with different dark energy equations of state and scattering cross sections. In models where the linear matter power spectrum is suppressed by the scattering, we find that on nonlinear scales the power spectrum is strongly enhanced. This is due to the friction term increasing the efficiency of gravitational collapse, which also leads to a scale-independent amplification of the concentration and mass functions of halos. The opposite trend is found for models characterised by an increase of the linear matter power spectrum normalisation. More quantitatively, we find that power spectrum deviations at nonlinear scales ($k\approx 10h/$Mpc) are roughly ten times larger than their linear counterparts, exceeding $100$ for the largest value of the scattering cross section considered in the present work. Similarly, the concentration-mass relation and the halo mass function show deviations up to $100$ and $20$, respectively, over a wide range of masses. Therefore, we conclude that nonlinear probes of structure formation might provide much tighter constraints on the scattering cross section between dark energy and dark matter as compared to the present bounds based on linear observables.

arXiv comment12 pages, 11 figures, 2 tables. Submitted to MNRAS

References in corpus (42)

• Planck 2013 results. XVI. Cosmological parameters
• The cosmological simulation code GADGET-2
• Populating a cluster of galaxies - I. Results at z=0
• The Aquarius Project: the subhalos of galactic halos
• Coupled Quintessence
• Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
• CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments
• Evolution of structure in cold dark matter universes
• The WiggleZ Dark Energy Survey: the growth rate of cosmic structure since redshift z=0.9
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measurements of the growth of structure and expansion rate at z=0.57 from anisotropic clustering
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Testing gravity with redshift-space distortions using the power spectrum multipoles
• Phenomenological parameterization of quintessence
• Cosmologies with Energy Exchange
• Hydrodynamical N-body simulations of coupled dark energy cosmologies
• Early Dark Energy Cosmologies
• The Warm DM halo mass function below the cut-off scale
• N-body simulations for coupled dark energy: halo mass function and density profiles
• Models of coupled dark matter to dark energy
• N-Body Simulations for Coupled Scalar Field Cosmology
• Imprints of dark energy on cosmic structure formation: II) Non-Universality of the halo mass function
• Cosmic Degeneracies I: Joint N-body Simulations of Modified Gravity and Massive Neutrinos
• Time dependent couplings in the dark sector: from background evolution to nonlinear structure formation
• Giant cluster arcs as a constraint on the scattering cross-section of dark matter
• Galilean Equivalence for Galactic Dark Matter
• Accurate estimators of power spectra in N-body simulations
• Modeling halo mass functions in chameleon f(R) gravity
• N-body simulations with generic non-Gaussian initial conditions I: Power Spectrum and halo mass function
• Evolution of Massive Haloes in non-Gaussian Scenarios
• Scattering of Dark Matter and Dark Energy
• Clarifying the effects of interacting dark energy on linear and nonlinear structure formation processes
• High-z massive clusters as a test for dynamical coupled dark energy
• The latitude dependence of the rotation measures of NVSS sources
• Clustering and redshift-space distortions in interacting dark energy cosmologies
• On the cross-section of Dark Matter using substructure infall into galaxy clusters
• The halo mass function in interacting Dark Energy models
• The Impact of Coupled Dark Energy Cosmologies on the High-Redshift Intergalactic Medium
• Maps of CMB lensing deflection from N-body simulations in Coupled Dark Energy Cosmologies
• The Effect of Coupled Dark Energy on the Alignment between Dark Matter and Galaxy Distributions in Clusters
• Weak lensing predictions for coupled dark energy cosmologies at non-linear scales
• Characterizing dark interactions with the halo mass accretion history and structural properties
• Raytracing simulations of coupled dark energy models
• Unmodified Gravity

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• Forecasts for interacting dark energy with time-dependent momentum exchange
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• Exponential quintessence with momentum coupling to dark matter
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• Non-linear structure formation with elastic interactions in the dark sector
• Degeneracy between warm and coupled cold dark matter: A clarifying note
• Dark sector interactions in the $w\to -1$ limit: velocity locking in pure momentum exchange models
• The effects on structure of a momentum coupling between dark matter and quintessence
• Momentum transfer models of interacting dark energy
• Probing the Type 3 interacting dark-energy model using matter pairwise velocity
• Dynamic Zoom Simulations of structure formation beyond standard cosmology
• Interacting dark energy from redshift-space galaxy clustering
• On the road to percent accuracy VI: the nonlinear power spectrum for interacting dark energy with baryonic feedback and massive neutrinos