Using dark energy to suppress power at small scales

Abstract

The latest Planck results reconfirm the existence of a slight but chronic tension between the best-fit Cosmic Microwave Background (CMB) and low-redshift observables: power seems to be consistently lacking in the late universe across a range of observables (e.g.~weak lensing, cluster counts). We propose a two-parameter model for dark energy where the dark energy is sufficiently like dark matter at large scales to keep the CMB unchanged but where it does not cluster at small scales, preventing concordance collapse and erasing power. We thus exploit the generic scale-dependence of dark energy instead of the more usual time-dependence to address the tension in the data. The combination of CMB, distance and weak lensing data somewhat prefer our model to $\Lambda$CDM, at $\Delta {\chi }^2=2.4$. Moreover, this improved solution has ${\sigma }_8=0.79\pm 0.02$, consistent with the value implied by cluster counts.

13 pages, 7 figures, changes match published version

References in corpus (23)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• The Large Scale Structure of f(R) Gravity
• Planck 2015 results. XXIV. Cosmology from Sunyaev-Zeldovich cluster counts
• Exploring gravitational theories beyond Horndeski
• A Parameterized Post-Friedmann Framework for Modified Gravity
• Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity
• Planck 2015 results. XIV. Dark energy and modified gravity
• Anisotropic stress as signature of non-standard propagation of gravitational waves
• Cosmology with Mimetic Matter
• Growing Matter
• On the Growth of Perturbations as a Test of Dark Energy
• Tension between the power spectrum of density perturbations measured on large and small scales
• Observables and unobservables in dark energy cosmologies
• Limits of Quasi-Static Approximation in Modified-Gravity Cosmologies
• Measuring the Speed of Dark: Detecting Dark Energy Perturbations
• Cosmological constraints on a decomposed Chaplygin gas
• Fingerprinting dark energy
• Hidden Negative Energies in Strongly Accelerated Universes
• Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures
• Newton's constant in f(R,R_{μν}R^{μν},\Box R) theories of gravity and constraints from BBN
• Fingerprinting Dark Energy II: weak lensing and galaxy clustering tests
• Accuracy of the growth index in the presence of dark energy perturbations
• The WiggleZ Dark Energy Survey: constraining the evolution of Newton's constant using the growth rate of structure

Cited by in corpus (30)

• Mimetic gravity: a review of recent developments and applications to cosmology and astrophysics
• Tension and constraints on modified gravity parametrizations of $G_{\text{eff}}(z)$ from growth rate and Planck data
• KiDS-450: Testing extensions to the standard cosmological model
• Arbitrating the $S_8$ discrepancy with growth rate measurements from Redshift-Space Distortions
• Limits of Quasi-Static Approximation in Modified-Gravity Cosmologies
• Covariant Horava-like and mimetic Horndeski gravity: cosmological solutions and perturbations
• Interpreting cosmological tensions from the effective field theory of torsional gravity
• Recovering a MOND-like acceleration law in mimetic gravity
• Constraints on deviations from $\Lambda$CDM within Horndeski gravity
• Cosmological Hints of Modified Gravity ?
• Relieving the Tension between Weak Lensing and Cosmic Microwave Background with Interacting Dark Matter and Dark Energy Models
• Conjoined constraints on modified gravity from the expansion history and cosmic growth
• Constraints on dark-matter properties from large-scale structure
• Cosmological constraints and comparison of viable $f(R)$ models
• Constraints on modified gravity from Planck 2015: when the health of your theory makes the difference
• Weakening Gravity on Redshift-Survey Scales with Kinetic Matter Mixing
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Testing Einstein's gravity and dark energy with growth of matter perturbations: Indications for new Physics?
• Diagnostic of Horndeski Theories
• Clustering dark energy and halo abundances
• Cosmological constraints on non-adiabatic dark energy perturbations
• A short review on clustering dark energy
• Cosmological dynamics of the general non-canonical scalar field models
• A GREAT model comparison against the cosmological constant
• The Integrated Sachs-Wolfe Effect in the Bulk Viscous Dark Energy Model
• Constraints on the speed of sound in the k-essence model of dark energy
• $f(\bar{R},L(X))$-gravity in the context of dark energy with power law expansion and energy conditions
• Cosmological effects on $f(\bar{R},\bar{T})$ gravity through a non-standard theory
• Interacting dark matter and cosmic acceleration
• Unified dark fluid with null sound speed as an alternative to phantom dark energy