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Measuring the cosmological background of relativistic particles with WMAP
We show that the first year results of the Wilkinson Microwave Anisotropy Probe (WMAP) constrain very efficiently the energy density in relativistic particles in the universe. We derive new bounds on additional relativistic degrees of freedom expressed in terms of an excess in the effective number o...
| Autores principales: | , , |
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| Lenguaje: | eng |
| Publicado: |
2003
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.67.123005 http://cds.cern.ch/record/605679 |