Traces on ideals in pivotal categories
  We extend the notion of an ambidextrous trace on an ideal (developed by the first two authors) to the setting of a pivotal category. We show that under some conditions, these traces lead to invariants of colored spherical graphs (and so to modified 6j-symbols). 
Nathan Geer, Bertrand Patureau-Mirand, Alexis Virelizier
math.QA math.GT