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In models with flavor symmetries in the leptonic sector leptogenesis can takeplace in a very different way compared to the standard leptogenesis scenario.We study the generation of a $B-L$ asymmetry in these kind of models in theflavor symmetric phase pointing out that successful leptogenesis requires (i)the right-handed neutrinos to lie in different representations of the flavorgroup; (ii) the flavons to be lighter at least that one of the right-handedneutrino representations. When these conditions are satisfied leptogenesisproceeds due to new contributions to the CP violating asymmetry and -dependingon the specific model- in several stages. We demonstrate the validity of thesearguments by studying in detail the generation of the $B-L$ asymmetry in ascenario of a concrete $A_4$ flavor model realization.

Leptogenesis in the presence of exact flavor symmetries