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Theory Seminars (High Energy/Cosmology) 

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On the negative ledger, models based on global symmetries suffer a generic gravity spoliation problem. We present two models based on the discrete Rsymmetry Z_{24}^R which may emerge from compactification of 10d Lorentzian spacetime in string theory where the mu term and dangerous proton decay and Rparity violating operators are either suppressed or forbidden while a gravitysafe PQ symmetry emerges as an accidental approximate global symmetry leading to a solution to the strong CP problem and a weakscale/natural value for the mu term.