Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-09
Phys.Lett. B627 (2005) 124-130
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 2 figures; minor changes in the text; accepted for publication in Phys. Lett.B
Scientific paper
10.1016/j.physletb.2005.08.101
We comment on a recently discussed possibility of oscillations between neutrons and degenerate mirror neutrons in the context of mirror models for particles and forces. It has been noted by Bento and Berezhiani that if these oscillations occurred at a rate of $\tau^{-1}_{NN'}\sim sec^{-1}$, it would help explain putative super GKZ cosmic ray events provided the temperature of the mirror radiation is $\sim 0.3-0.4$ times that of familiar cosmic microwave background radiation. We discuss how such oscillation time scales can be realized in mirror models and find that the simplest nonsupersymmetric model for this idea requires the existence of a low mass (30-3000 GeV) color triplet scalar or vector boson. A supersymmetric model, where this constraint can be avoided is severely constrained by the requirement of maintaining a cooler mirror sector. We also find that the reheat temperature after inflation in generic models that give fast $n-n'$ oscillation be less than about 300 GeV in order to maintain the required relative coolness of the mirror sector.
Mohapatra Rabindra N.
Nasri Salah
Nussinov Shmuel
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