Motivated by the recent MINOS observation, Δm322≠Δm̄322, we study CPT violation in neutrino sector caused by ghost condensation. As a concrete model, we consider an extra dimension model with two branes, which are spatially separated and communicate only through singlet 'messenger' fermion fields which contain right-handed neutrinos in the bulk. Assuming ghost condensation on one brane and localization of the standard model sector on the other brane, CPT violation occurs only in neutrino sector by Yukawa couplings with the messengers, which, at the same time, lead small neutrino masses. In the parameter space which is consistent with the MINOS observation suggests possible observation of the twinkling cosmic microwave background radiation and blinking light-ray from a quasar at a large distance, with a timescale about 0.1 day.
|Number of pages
|Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
|Published - 2011 Feb 14
Bibliographical noteFunding Information:
The authors would thank Tsutomu Yanagida, Hitoshi Murayama and Masahiro Tanaka for helpful discussions and comments. This work was supported by the World Premier International Research Center Initiative (WPI initiative) by MEXT . The work of S.M. was supported in part by Grant-in-Aid for Young Scientists (B) No. 17740134 , Grant-in-Aid for Creative Scientific Research No. 19GS0219 , Grant-in-Aid for Scientific Research on Innovative Areas No. 21111006 , Grant-in-Aid for Scientific Research (C) No. 21540278 , and the Mitsubishi Foundation . S.C.P. is supported by the Grant-in-Aid for Scientific Research ( Young Scientists (B) No. 21740172 ) from JSPS, Japan.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics