N=2 SCFT and M theory on AdS4×Q1,1,1

Coincident M2 branes at a conical singularity are related to M theory on AdS4×X7 for an appropriate 7 dimensional Sasaki-Einstein manifold X7. For X7=Q1,1,1=(SU(2)×SU(2)×SU(2))/(U(1)×U(1)) which was found sometime ago, the infrared limit of the theory on N M2 branes was constructed recently. It is the SU(N)×SU(N)×SU(N) gauge theories with three series of chiral fields Ai,i=1,2 transforming in the (N,N,1) representation, Bj,j=1,2 transforming in the (1,N,N) representation and Ck,k=1,2 transforming in the (N,1,N) representation. From the scalar Laplacian of X7 on the supergravity side, we discuss the spectrum of chiral primary operators of dual N=2 superconformal field theory in 3 dimensions. We study M5 branes wrapped over 5-cycle of X7 which were identified as (three types of) baryon like operators made out of N chiral fields recently. We consider M5 brane wrapped over 3-cycle of X7 which plays the role of domain wall in AdS4. The new aspect arises when baryon like operators (M5 branes wrapped over 5-cycle) cross a domain wall (M5 brane wrapped over 3-cycle), M2 brane between them must be created.