Abstract
Context - The Euclid mission of the European Space Agency will deliver weak gravitational lensing and galaxy clustering surveys
that can be used to constrain the standard cosmological model and extensions thereof.
Aims - We present forecasts from the combination of the Euclid photometric galaxy surveys (weak lensing, galaxy clustering and their cross-correlation) and its spectroscopic redshift survey on the sensitivity to cosmological parameters including the summed neutrino mass Pmν and the effective number of relativistic species Neff in the standard ΛCDM scenario and in a scenario with dynamical dark energy (w0waCDM).
Methods - We compare the accuracy of different algorithms predicting the nonlinear matter power spectrum for such models. We then validate several pipelines for Fisher matrix and Markov Chain Monte Carlo (MCMC) forecasts, using different theory codes, algorithms for numerical derivatives, and assumptions concerning the nonlinear cut-off scale.
Results - The Euclid primary probes alone will reach a sensitivity of σ( Pmν = 60 meV) = 56 meV in the ΛCDM+Pmν model, whereas the combination with cosmic microwave background (CMB) data from Planck is expected to achieve σ( Pmν) = 23 meV and raise the evidence for a non-zero neutrino mass to at least the 2.6 σ level. This can be pushed to a 4 σ detection if future CMB data from LiteBIRD and CMB Stage-IV are included. In combination with Planck, Euclid will also deliver tight constraints on ∆Neff < 0.144 (95%CL) in the ΛCDM+Pmν+Neff model, or ∆Neff < 0.063 when future CMB data are included. When floating the dark energy parameters, we find that the sensitivity to Neff remains stable, while that to Pmν degrades at most by a factor two.
Conclusions - This work illustrates the complementarity between the Euclid spectroscopic and imaging/photometric surveys and between Euclid and CMB constraints. Euclid will have a great potential for measuring the neutrino mass and excluding wellmotivated scenarios with additional relativistic particles.
Aims - We present forecasts from the combination of the Euclid photometric galaxy surveys (weak lensing, galaxy clustering and their cross-correlation) and its spectroscopic redshift survey on the sensitivity to cosmological parameters including the summed neutrino mass Pmν and the effective number of relativistic species Neff in the standard ΛCDM scenario and in a scenario with dynamical dark energy (w0waCDM).
Methods - We compare the accuracy of different algorithms predicting the nonlinear matter power spectrum for such models. We then validate several pipelines for Fisher matrix and Markov Chain Monte Carlo (MCMC) forecasts, using different theory codes, algorithms for numerical derivatives, and assumptions concerning the nonlinear cut-off scale.
Results - The Euclid primary probes alone will reach a sensitivity of σ( Pmν = 60 meV) = 56 meV in the ΛCDM+Pmν model, whereas the combination with cosmic microwave background (CMB) data from Planck is expected to achieve σ( Pmν) = 23 meV and raise the evidence for a non-zero neutrino mass to at least the 2.6 σ level. This can be pushed to a 4 σ detection if future CMB data from LiteBIRD and CMB Stage-IV are included. In combination with Planck, Euclid will also deliver tight constraints on ∆Neff < 0.144 (95%CL) in the ΛCDM+Pmν+Neff model, or ∆Neff < 0.063 when future CMB data are included. When floating the dark energy parameters, we find that the sensitivity to Neff remains stable, while that to Pmν degrades at most by a factor two.
Conclusions - This work illustrates the complementarity between the Euclid spectroscopic and imaging/photometric surveys and between Euclid and CMB constraints. Euclid will have a great potential for measuring the neutrino mass and excluding wellmotivated scenarios with additional relativistic particles.
Original language | English |
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Journal | Astronomy and Astrophysics |
Publication status | Accepted for publication - 14 Oct 2024 |
Keywords
- astro-ph.CO