Physics – High Energy Physics
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..881..167o&link_type=abstract
CAIRO INTERNATIONAL CONFERENCE ON HIGH ENERGY PHYSICS (CICHEP II). AIP Conference Proceedings, Volume 881, pp. 167-172 (2007).
Physics
High Energy Physics
Neutrino Mass And Mixing, String And Brane Phenomenology, Particle-Theory And Field-Theory Models Of The Early Universe
Scientific paper
The thermal leptogenesis in brane world cosmology is studied. In brane world cosmology, the expansion law is modified from the four-dimensional standard cosmological one at high temperature regime in the early universe. As a result, the well-known upper bound on the lightest light neutrino mass induced by the condition for the out-of-equilibrium decay of the lightest heavy neutrino, m~1 <~ 10-3 eV, can be moderated to be m~1 <~ 10-3 eV × (M1/Tt)2 in the case of Tt <= M1 with the lightest heavy neutrino mass (M1) and the ``transition temperature'' (Tt), at which the modified expansion law in brane world cosmology is smoothly connecting with the standard one. This implies that the degenerate mass spectrum of the light neutrinos can be consistent with the thermal leptogenesis scenario. On the other hand, if the brane world effect is too effective, thermal equilibrium state can not realize. This fact leads to the lower bound on the five-dimensional Planck mass and limits compatible inflation models.
Okada Nobuchika
Seto Osamu
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