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キーワード:
High Energy Physics - Phenomenology, hep-ph,High Energy Physics - Theory, hep-th
要旨:
Can global internal and spacetime symmetries be connected without
supersymmetry? To answer this question, we investigate Minkowski spacetimes
with d space-like extra dimensions and point out under which general conditions
external symmetries induce internal symmetries in the effective 4-dimensional
theories. We further discuss in this context how internal degrees of freedom
and spacetime symmetries can mix without supersymmetry in agreement with the
Coleman-Mandula theorem. We present some specific examples which rely on a
direct product structure of spacetime such that orthogonal extra dimensions can
have symmetries which mix with global internal symmetries. This mechanism opens
up new opportunities to understand global symmetries in particle physics.
