Reconsidering extra time-like dimensions

Details Reconsidering extra time-like dimensions Reconsidering extra time-like dimensions

2005-10-15

arxiv.org/abs/hep-ph/0510207v2

Eur.Phys.J.C47:845-850,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

The version to appear in EPJC

Scientific paper

10.1140/epjc/s2006-02587-5

In this study we reconsider the phenomenological problems related to tachyonic modes in the context of extra time-like dimensions. First we reconsider a lower bound on the size of extra time-like dimensions. Next we discuss the issues of spontaneous decay of stable fermions through tachyonic decays and disappearance of fermions due to tachyonic contributions to their self-energies. We find that the tachyonic modes due to extra time-like dimensions are less problematic than the tachyonic modes in the usual 4-dimensional setting because the most troublesome Feynman diagrams are forbidden once the conservation of momentum in the extra time-like dimensions is imposed.

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