Observable Predictions for Massive-Neutrino Cosmologies with Model-Independent Dark Energy

Abstract

We investigate the bounds on the sum of neutrino masses in a cosmic-acceleration scenario where the equation of state $w(z)$ of dark energy (DE) is constructed in a model-independent way, using a basis of principal components (PCs) that are allowed to cross the phantom barrier $w(z)=-1$. We find that the additional freedom provided to $w(z)$ means the DE can undo changes in the background expansion induced by massive neutrinos at low redshifts. This has two significant consequences: (1) it leads to a substantial increase in the upper bound for the sum of the neutrino masses ($M_{\nu }<0.33-0.55$ eV at the 95\% C.L. depending on the data sets and number of PCs included) compared to studies that choose a specific parametrization for $w(z)$; and (2) it causes $\sim 1\sigma$ deviations from $\Lambda$CDM in the luminosity distance and the Hubble expansion rate at higher redshifts ($z\gtrsim 2$), where the contribution of DE is subdominant and there is little constraining data. The second point consequently means that there are also observable deviations in the shear power spectrum and in the matter power spectrum at low redshift, since the clustering of matter throughout cosmic time depends on the expansion rate. This provides a compelling case to pursue high-$z$ BAO and SN measurements as a way of disentangling the effects of neutrinos and dark energy. Finally, we find that the additional freedom given to the dark energy component has the effect of lowering $S_8$ with respect to $\Lambda$CDM.

11 pages, 6 figures

References in corpus (43)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Planck 2015 results. XIII. Cosmological parameters
• Efficient Computation of CMB anisotropies in closed FRW models
• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Revising the Halofit Model for the Nonlinear Matter Power Spectrum
• KiDS-450: Cosmological parameter constraints from tomographic weak gravitational lensing
• Cosmology and fundamental physics with the Euclid satellite
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data
• Planck 2015 results. XI. CMB power spectra, likelihoods, and robustness of parameters
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity
• Efficient sampling of fast and slow cosmological parameters
• Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data
• CMB power spectrum parameter degeneracies in the era of precision cosmology
• Dynamical dark energy in light of the latest observations
• Planck 2015 results. XV. Gravitational lensing
• Measurement of Baryon Acoustic Oscillations in the Lyman-alpha Forest Fluctuations in BOSS Data Release 9
• CosmoLike - Cosmological Likelihood Analyses for Photometric Galaxy Surveys
• CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics
• 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
• The implications of an extended dark energy cosmology with massive neutrinos for cosmological tensions
• KiDS-450: The tomographic weak lensing power spectrum and constraints on cosmological parameters
• Simulations of the WFIRST Supernova Survey and Forecasts of Cosmological Constraints
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: BAO measurement from the LOS-dependent power spectrum of DR12 BOSS galaxies
• Dark Energy Survey Year 1 Results: Multi-Probe Methodology and Simulated Likelihood Analyses
• Updated Bounds on Sum of Neutrino Masses in Various Cosmological Scenarios
• Looking through the same lens: shear calibration for LSST, Euclid & WFIRST with stage 4 CMB lensing
• Falsifying Paradigms for Cosmic Acceleration
• Banana Split: Testing the Dark Energy Consistency with Geometry and Growth
• Hiding dark energy transitions at low redshift
• Figures of merit for present and future dark energy probes
• Extending the Coyote emulator to dark energy models with standard $w_0$-$w_a$ parametrization of the equation of state
• Strong Bounds on Sum of Neutrino Masses in a 12 Parameter Extended Scenario with Non-Phantom Dynamical Dark Energy ($w(z)\ge -1$)
• Simulations of BAO reconstruction with a quasar Lyman-alpha survey
• Model-Independent Predictions for Smooth Cosmic Acceleration Scenarios

Cited by in corpus (10)

• Dark energy in light of the early JWST observations: case for a negative cosmological constant?
• Tension of the $E_G$ statistic and RSD data with Planck/$\Lambda$CDM and implications for weakening gravity
• Soundness of Dark Energy properties
• Impacts of gravitational-wave standard siren observations from Einstein Telescope and Cosmic Explorer on weighing neutrinos in interacting dark energy models
• DEMNUni: disentangling dark energy from massive neutrinos with the void size function
• Impacts of dark energy on constraining neutrino mass after Planck 2018
• Constraints on neutrino mass in the scenario of vacuum energy interacting with cold dark matter after Planck 2018
• Reconstruction of late-time cosmology using Principal Component Analysis
• Measuring neutrino masses with joint JWST and DESI DR2 data
• Searching for dark energy in the matter-dominated era