Discrepancies between CFHTLenS cosmic shear & Planck: new physics or systematic effects?

Abstract

There is currently a discrepancy in the measured value of the amplitude of matter clustering, parameterised using ${\sigma }_8$, inferred from galaxy weak lensing, and cosmic microwave background data, which could be an indication of new physics, such as massive neutrinos or a modification to the gravity law, or baryon feedback. In this paper we make the assumption that the cosmological parameters are well determined by Planck, and use weak lensing data to investigate the implications for baryon feedback and massive neutrinos, as well as possible contributions from intrinsic alignments and biases in photometric redshifts. We apply a non-parametric approach to model the baryonic feedback on the dark matter clustering, which is flexible enough to reproduce the OWLS and Illustris simulation results. The statistic we use, 3D cosmic shear, is a method that extracts cosmological information from weak lensing data using a spherical-Bessel function power spectrum approach. We analyse the CFHTLenS weak lensing data and, assuming best fit cosmological parameters from the Planck CMB experiment, find that there is no evidence for baryonic feedback on the dark matter power spectrum, but there is evidence for a bias in the photometric redshifts in the CFHTLenS data, consistent with a completely independent analysis by Choi et al. (2015), based on spectroscopic redshifts; and that these conclusions are robust to assumptions about the intrinsic alignment systematic. We also find an upper limit on the sum of neutrino masses conditional on other $\Lambda$CDM parameters being fixed, of $<0.28$ eV ($1\sigma$).

13 pages, 6 figures, accepted to MNRAS

References in corpus (16)

• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Properties of galaxies reproduced by a hydrodynamic simulation
• Extended Limber Approximation
• Effects of Baryons and Dissipation on the Matter Power Spectrum
• Moving mesh cosmology: tracing cosmological gas accretion
• Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy
• How accurate is Limber's equation?
• Self Calibration of Tomographic Weak Lensing for the Physics of Baryons to Constrain Dark Energy
• Measuring dark energy properties with 3D cosmic shear
• Cosmological constraints from COMBO-17 using 3D weak lensing
• Constraints and tensions in testing general relativity from Planck and CFHTLenS including intrinsic alignment systematics
• 3D Weak Gravitational Lensing of the CMB and Galaxies
• Are priors responsible for cosmology favoring additional neutrino species?
• Improving Photometric Redshifts using GALEX Observations for the SDSS Stripe 82 and the Next Generation of SZ Cluster Surveys
• A New Data Compression Method and its Application to Cosmic Shear Analysis
• Constraining dark sector perturbations I: cosmic shear and CMB lensing

Cited by in corpus (34)

• KiDS-450: Cosmological parameter constraints from tomographic weak gravitational lensing
• Unveiling $\nu$ secrets with cosmological data: neutrino masses and mass hierarchy
• KiDS+GAMA: Cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing and angular clustering
• Constraints on the sum of the neutrino masses in dynamical dark energy models with $w(z)\ge -1$ are tighter than those obtained in $\Lambda$CDM
• Tension and constraints on modified gravity parametrizations of $G_{\text{eff}}(z)$ from growth rate and Planck data
• The impact of baryons on the matter power spectrum from the Horizon-AGN cosmological hydrodynamical simulation
• Dark sector interaction: a remedy of the tensions between CMB and LSS data
• Updated results on neutrino mass and mass hierarchy from cosmology with Planck 2018 likelihoods
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Cosmological implications of the Fourier space wedges of the final sample
• Modeling baryonic physics in future weak lensing surveys
• Partially Acoustic Dark Matter, Interacting Dark Radiation, and Large Scale Structure
• Scientific Synergy Between LSST and Euclid
• Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy
• Cosmological parameters, shear maps and power spectra from CFHTLenS using Bayesian hierarchical inference
• Constraints on dark-matter properties from large-scale structure
• Cosmological bounds on dark matter-photon coupling
• On structure formation from a small-scales-interacting dark sector
• Dark Energy Survey Year 1 Results: Constraining Baryonic Physics in the Universe
• Testing (modified) gravity with 3D and tomographic cosmic shear
• Planck confronts large scale structure: methods to quantify discordance
• Bayesian forward modelling of cosmic shear data
• Probing the properties of relic neutrinos using the cosmic microwave background, the Hubble Space Telescope and galaxy clusters
• Cosmological searches for a non-cold dark matter component
• Cosmic Shear as a Probe of Galaxy Formation Physics
• Inference from the small scales of cosmic shear with current and future Dark Energy Survey data
• The effect of dark matter-dark radiation interactions on halo abundance -- a Press-Schechter approach
• Red, Straight, no bends: primordial power spectrum reconstruction from CMB and large-scale structure
• A visual tool for assessing tension-resolving models in the $H_0$-${\sigma }_8$ plane
• Correcting cosmological parameter biases for all redshift surveys induced by estimating and reweighting redshift distributions
• Non-linear Phenomenology of Disformally Coupled Quintessence
• An Optimally Weighted Estimator of the Linear Power Spectrum Disentangling the Growth of Density Perturbations Across Galaxy Surveys
• Implications for the missing low-mass galaxies (satellites) problem from cosmic shear
• Diagnosing Systematic Effects Using the Inferred Initial Power Spectrum
• Photometric redshifts for the S-PLUS Survey: is machine learning up to the task?