Analytic expressions for the background evolution of massive neutrinos and dark matter particles
arXiv:1906.03160 · doi:10.1088/1475-7516/2019/10/060
Abstract
We provide exact analytic expressions for the density, pressure, average number density and pseudo-pressure for massive neutrinos and generic dark matter particles, both fermions and bosons. We then focus on massive neutrinos and we compare our analytic expressions with the numerical implementation in the CLASS Boltzmann code. We find that our modifications including the exact analytic expressions are in agreement to better than with the default CLASS implementation in the estimation of the CMB power spectrum; our modifications do not have an impact on the performance of the code. We also provide several specific limits of our expressions at the relativistic regime, but also at late times for the neutrino equation of state.
arXiv comment15 pages, 4 figures, changes match published version
References in corpus (32)
- Planck 2015 results. XIII. Cosmological parameters
- Efficient Computation of CMB anisotropies in closed FRW models
- The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
- Cosmological Perturbation Theory in the Synchronous vs. Conformal Newtonian Gauge
- Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
- A History of Dark Matter
- Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
- Massive neutrinos and cosmology
- Status of global fits to neutrino oscillations
- Global analysis of three-flavour neutrino oscillations: synergies and tensions in the determination of theta_23, delta_CP, and the mass ordering
- Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity
- Weighing Neutrinos with Galaxy Surveys
- Global analysis of three-flavor neutrino masses and mixings
- The Cosmic Linear Anisotropy Solving System (CLASS) IV: Efficient implementation of non-cold relics
- Cosmological bounds on neutrino degeneracy improved by flavor oscillations
- Cosmic Complementarity: Joint Parameter Estimation from CMB Experiments and Redshift Surveys
- Neutrino mass from Cosmology
- Analytical treatment of neutrino asymmetry equilibration from flavour oscillations in the early universe
- Stringent Constraints on Cosmological Neutrino-Antineutrino Asymmetries from Synchronized Flavor Transformation
- Current unknowns in the three neutrino framework
- Neutrino cosmology and Planck
- Present status of primordial nucleosynthesis after WMAP: results from a new BBN code
- Lepton asymmetry and primordial nucleosynthesis in the era of precision cosmology
- Probing neutrino masses with future galaxy redshift surveys
- Updated BBN bounds on the cosmological lepton asymmetry for non-zero theta13
- Cosmological Constraints from Multiple Probes in the Dark Energy Survey
- Hiding relativistic degrees of freedom in the early universe
- Cosmological lepton asymmetry with a nonzero mixing angle θ_{13}
- Neutrino masses and beyond-CDM cosmology with LSST and future CMB experiments
- Constraints on dark-matter properties from large-scale structure
- How Late can the Dark Matter form in our universe?
- Brane cosmological solutions in six-dimensional warped flux compactifications