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Determining neutrino mass from the cosmic microwave background alone
Manoj Kaplinghat1, Lloyd Knox, Yong-Seon Song
1Department of Physics, University of California, One Shields Avenue, Davis, California 95616, USA.
Physical Review Letters
|December 20, 2003
Summary
Measuring neutrino mass is possible using cosmic microwave background (CMB) lensing. Enhanced sensitivity and resolution could detect neutrino mass, potentially confirming atmospheric neutrino oscillation data.
Area of Science:
- Cosmology
- Particle Physics
Background:
- Cosmic Microwave Background (CMB) temperature and polarization maps contain information about fundamental physics.
- Gravitational lensing by large-scale structures distorts these CMB maps.
- Neutrino mass is a key parameter in the Standard Model of particle physics and cosmology.
Purpose of the Study:
- To forecast the potential for measuring neutrino mass using CMB lensing distortions.
- To assess the impact of improved observational capabilities on neutrino mass measurements.
Main Methods:
- Utilizing simulated gravitational lensing distortions in CMB maps.
- Forecasting measurement uncertainties for neutrino mass (m(nu)) based on different instrumental sensitivities and angular resolutions.
- Comparing forecasted uncertainties with requirements for detecting neutrino mass, informed by atmospheric neutrino oscillation data.
Main Results:
- A forecast of sigma(m(nu))=0.15 eV using Planck satellite data.
- A significantly improved forecast of sigma(m(nu))=0.04 eV with enhanced resolution and sensitivity (approx. 20x).
- The enhanced sensitivity forecast aligns with the scale required to detect neutrino mass from atmospheric neutrino oscillations.
Conclusions:
- CMB lensing provides a powerful probe for measuring neutrino mass.
- Future, more sensitive CMB observations are crucial for a definitive detection of neutrino mass.
- A detection at ~0.04 eV sensitivity would have significant implications for particle physics and cosmology.