Part 2
Dark Matter and Neutrinos

2.1 Introduction
2.2 Dark matter halo properties
 2.2.1 The halo mass function as a function of redshift
 2.2.2 The dark matter density profile
2.3 Euclid dark matter studies: wide-field X-ray complementarity
2.4 Dark matter mapping
 2.4.1 Charting the universe in 3D
2.5 Scattering cross sections
 2.5.1 Dark matter–dark matter interactions
 2.5.2 Dark matter–baryonic interactions
 2.5.3 Dark matter–dark energy interactions
2.6 Cross-section constraints from galaxy clusters
 2.6.1 Bulleticity
2.7 Constraints on warm dark matter
 2.7.1 Warm dark matter particle candidates
 2.7.2 Dark matter free-streaming
 2.7.3 Current constraints on the WDM particle from large-scale structure
2.8 Neutrino properties
 2.8.1 Evidence of relic neutrinos
 2.8.2 Neutrino mass
 2.8.3 Hierarchy and the nature of neutrinos
 2.8.4 Number of neutrino species
 2.8.5 Model dependence
 2.8.6 Σ forecasted error bars and degeneracies
 2.8.7 Ne ff forecasted errors and degeneracies
 2.8.8 Nonlinear effects of massive cosmological neutrinos on bias and RSD
2.9 Coupling between dark energy and neutrinos
2.10 Unified Dark Matter
 2.10.1 Theoretical background
 2.10.2 Euclid observables
2.11 Dark energy and dark matter
2.12 Ultra-light scalar fields
 2.12.1 Requirements
2.13 Dark-matter surrogates in theories of modified gravity
 2.13.1 Extra fields in modified gravity
 2.13.2 Vector dark matter in Einstein-Aether models
 2.13.3 Scalar and tensors in TeVeS
 2.13.4 Tensor dark matter in models of bigravity
2.14 Outlook

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