期刊
PHYSICAL REVIEW LETTERS
卷 111, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.231301
关键词
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资金
- Chilean Ministry for the Economy, Development
- Tourism's Programa Iniciativa Cientifica Milenio [P07-021-F]
- Proyecto Fondecyt [1110326]
- BASAL Center for Astrophysics and Associated Technologies [PFB-06]
- Proyecto Anillo [ACT-86]
- MECESUP (Chile) [PUC0609]
- Deutsche Forschungsgemeinschaft [EXC 153]
- European Union through the Initial Training Network Invisibles'' [PITN-GA-2011-28944]
- Alexander von Humboldt Foundation
- CNPq
- CAPES
- INEspaco
The red-giant branch (RGB) in globular clusters is extended to larger brightness if the degenerate helium core loses too much energy in dark channels.'' Based on a large set of archival observations, we provide high-precision photometry for the Galactic globular cluster M5 (NGC 5904), allowing for a detailed comparison between the observed tip of the RGB with predictions based on contemporary stellar evolution theory. In particular, we derive 95% confidence limits of g(ae) < 4: 3 x 10(-13) on the axionelectron coupling and mu(p) < 4: 5 x 10(-12) mu(B) (Bohr magneton mu(B) = e/2m(e)) on a neutrino dipole moment, based on a detailed analysis of statistical and systematic uncertainties. The cluster distance is the single largest source of uncertainty and can be improved in the future.
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