Cicalese:
We introduce a classical ferromagnetic/antiferromagnetic lattice spin model which goes under the name of J1-J2-J3 model. We consider the excess energy of the system about the ground states In the vicinity of the ferromagnet/helimagnet transition point and carry out the Gamma-convergence analysis as the lattice spacing vanishes to prove the emergence of chirality domains and characterize the optimal cost of a chirality transition in BV. To this end we prove that the system is asymptotically driven by an energy that can be seen as a discrete version of a non-linear perturbation of the Aviles-Giga functional.http://cvgmt.sns.it/seminar/822/
