Cosmological neutrino bounds for non-cosmologists

Details Cosmological neutrino bounds for non-cosmologists Cosmological neutrino bounds for non-cosmologists

2005-03-24

arxiv.org/abs/hep-ph/0503257v1

Phys.Scripta T121:153-155,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figs, in "Neutrino Physics", Proceedings of Nobel Symposium 129, eds., L Bergstrom, O. Botner, P. Carlson, P. O. Hu

Scientific paper

10.1088/0031-8949/2005/T121/023

I briefly review cosmological bounds on neutrino masses and the underlying gravitational physics at a level appropriate for readers outside the field of cosmology. For the case of three massive neutrinos with standard model freezeout, the current 95% upper limit on the sum of their masses is 0.42 eV. I summarize the basic physical mechanism making matter clustering such a sensitive probe of massive neutrinos. I discuss the prospects of doing still better in coming years using tools such as lensing tomography, approaching a sensitivity around 0.03 eV. Since the lower bound from atmospheric neutrino oscillations is around 0.05 eV, upcoming cosmological measurements should detect neutrino mass if the technical and fiscal challenges can be met.

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