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Neutrino Physics from the Cosmic Microwave Background and Large Scale Structure
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This is a report on the status and prospects of the quantification of neutrino properties through the cosmological neutrino background for the Cosmic Frontier of the Division of Particles and Fields Community Summer Study long-term planning exercise. Experiments planned and underway are prepared to study the cosmological neutrino background in detail via its influence on distance-redshift relations and the growth of structure. The program for the next decade described in this document, including upcoming spectroscopic galaxy surveys eBOSS and DESI and a new Stage-IV CMB polarization experiment CMB-S4, will achieve sigma(sum m_nu) = 16 meV and sigma(N_eff) = 0.020. Such a mass measurement will produce a high significance detection of non-zero sum m_nu, whose lower bound derived from atmospheric and solar neutrino oscillation data is about 58 meV. If neutrinos have a minimal normal mass hierarchy, this measurement will definitively rule out the inverted neutrino mass hierarchy, shedding light on one of the most puzzling aspects of the Standard Model of particle physics --- the origin of mass. This precise a measurement of N_eff will allow for high sensitivity to any light and dark degrees of freedom produced in the big bang and a precision test of the standard cosmological model prediction that N_eff = 3.046.
Forward citations
Cited by 15 Pith papers
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Sensitivity of Next-Generation CMB Surveys to Neutrinos and Other Light Relics
CMB-S4 forecasts: the two-site design reaches sigma(Neff)=0.029 in seven years, the Chile-only revised design reaches 0.030 in nine, and a cosmic-variance-limited survey would reach 0.0073.
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Intensity fluctuations of radio halo in galaxy cluster: Insights from power spectrum estimation
Angular power spectra of 610 MHz radio halos show excess power-law fluctuations only in Abell 2744, requiring multiplicative C_ℓ ∝ ℓ^{-3} structure atop an exponential profile and consistent with ICM turbulence.
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Reanalyzing DESI DR1: 4. Percent-Level Cosmological Constraints from Combined Probes and Robust Evidence for the Normal Neutrino Mass Hierarchy
A combined-analysis of DESI galaxy clustering, CMB lensing, BAO, CMB, and supernovae yields percent-level Lambda-CDM parameters, improved dark-energy figure-of-merit, and neutrino-mass bounds that disfavor the inverte...
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Massive neutrinos and interacting dark matter look alike through the lens of lensing
Massive neutrinos and dark matter-baryon interactions produce degenerate suppressions in the CMB lensing power spectrum at next-generation experiment precision.
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Prospects for measuring neutrino mass with 21-cm forest
Using an analytic halo model, the authors forecast that 21-cm forest observations with SKA-LOW could constrain the total neutrino mass to about 0.1 eV, potentially distinguishing neutrino mass hierarchies.
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Modeling beam chromaticity for high-resolution CMB analyses
Neglecting frequency-dependent beams in a Simons Observatory-like analysis biases foreground parameters by more than 2 sigma and cosmological parameters by up to 0.3 sigma, making per-component color-corrected beams n...
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Joint Constraints on Neutrinos and Dynamical Dark Energy in Minimally Modified Gravity
The w†VCDM model shows a statistically significant preference for late-time quintessence-phantom crossing dark energy, raises the Hubble constant, and satisfies neutrino mass and Neff constraints from current cosmolog...
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Two-Component Dark Matter with an SU(2) Dark Sector
A hidden SU(2) gauge sector that breaks to a Z3-protected two-component dark matter scenario is shown to have parameter points satisfying existing constraints.
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Large-Scale Structure Probes of the Post-Inflationary Axiverse
HST ultraviolet luminosity function data at z=4-10, combined with Lyman-α and CMB data, place leading constraints on subdominant post-inflationary axion dark matter via its white-noise isocurvature perturbations.
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Neutrino Mass Constraints from kSZ Tomography
kSZ tomography will add little to neutrino mass constraints from Stage IV surveys unless the kSZ optical depth degeneracy is broken.
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B-mode Power Spectrum of CMB via Polarized Compton Scattering
Compton scattering off partially polarized electrons can generate B-mode polarization from scalar density perturbations, with an amplitude proportional to the square of the electron polarization asymmetry.
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Cosmological preference for a positive neutrino mass at 2.7$\sigma$: A joint analysis of DESI DR2, DESY5, and DESY1 data
A joint fit of DESI DR2, CMB, DESY5 and DESY1 data gives total neutrino mass 0.098 (+0.016, -0.037) eV, a 2.7 sigma preference for positive mass in the w0waCDM model.
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Weighing neutrinos with 21cm Intensity Mapping at the SKAO
Forecasted SKAO 21cm intensity mapping plus Planck 2018 data could push the 95% upper limit on the summed neutrino mass from 0.285 eV to about 0.105 eV (fixed astrophysical nuisances).
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CMB-S4 Science Case, Reference Design, and Project Plan
Presents the science case, reference design, and project plan for the CMB-S4 ground-based CMB experiment.
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Update on the Physics of the Cosmic Microwave Background (2015-2025)
A status review of CMB science 2015-2025: the six-parameter ΛCDM model still fits the power spectra, primordial B-modes remain undetected with r < 0.036, and the Hubble tension persists at over 5σ.
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