Title:  Minimal neutrinoless double decay rates from anarchy to flavor symmetries.

Abstract:  Experimental probes of neutrinoless double beta decay are 
approaching an interesting regime and should produce valuable data in the 
near future.  Model independent interpretations of these results are 
critical to the understanding of neutrino mass generation.  Assuming the 
Majorana neutrino nature, a vanishing neutrinoless double beta decay rate 
is excluded by the Extended Black Box Theorem, but it is natural to wonder 
exactly how small it can be given existing constraints.  To answer this 
question, I explore the two opposite extremes of neutrino mass generation 
dictated by flavor symmetries and mass matrix anarchy.  Armed with these 
minimal rates I will discuss how next generation experiments can constrain 
the available model space.  I also point out how these results are modified 
by the addition of new light degrees of freedom.  In particular, there is a 
strong connection between light sterile neutrinos and lepton number violation.