Walls of massive K\"ahler sigma models on SO(2N)/U(N) and Sp(N)/U(N)
  We study the Bogomol'nyi-Prasad-Sommerfield wall solutions in massive K\"ahler nonlinear sigma models on SO(2N)/U(N) and Sp(N)/U(N) in three-dimensional spacetime. We show that SO(2N)/U(N) and Sp(N)/U(N) models have 2^{N-1} and 2^N discrete vacua, respectively. We explicitly construct the exact BPS multiwall solutions for N\le 3. 
Masato Arai and Sunyoung Shin
hep-th