1202.2237 (F. S. Sá Barreto et al.)

Correlation equalities and upper bounds for the transverse Ising model    [PDF]

F. S. Sá Barreto, A. L. Mota

Starting from an exact formal identity for the two-state transverse Ising
model and using correlation inequalities rigorous upper bounds for the critical
temperature and the critical transverse field are obtained which improve
effective results.

View original: http://arxiv.org/abs/1202.2237