On the choice of the density matrix in the stochastic TMRG (Q2766275)

The authors investigate the question of the correct choise of the density matrix, which is at the core of all asymmetrical density matrix renormalization group (DMRG) applications for the new stochastic transfer matrix DMRG (stochastic TMRG). They give explicit constructions for the eigenvalues and selected eigenvectors of the stochastic transfer matrix. This allows to demonstrate that the content of the asymmetrical density matrix is essentially trivial, while the symmetrical density matrix is the physically adequate choice.