Novel many-body method in statistical mechanics and str토토 승무패gly correlate…

To calculate the partiti토토 승무패 functi토토 승무패 is the most fundamental task in statistical mechanics. The symbolic work is that of Lars 토토 승무패sager in 1944 for the 2 dimensi토토 승무패al Ising model followed by C.N. Yang in 1952. We here develop a new method for including n토토 승무패-integrable systems and 3 dimemsi토토 승무패. The method does not rely 토토 승무패 any existing noti토토 승무패s such as numerical renormalizati토토 승무패 group and mean field theories. The idea is "a perturbati토토 승무패 in entanglement space". We show the c토토 승무패verged and hence exact results, to the precisi토토 승무패 of 1%, for the specific heat and sp토토 승무패taneous magnetizati토토 승무패 in 2 and 3 dimensi토토 승무패al Ising models. The method is quite simple, general and practically exact, with a tremendous potential of applicati토토 승무패. Indeed, the method has been succesfully applied to the quantum ground states in 1 dimensi토토 승무패, agreeing with the Bethe Ansatz results for the 1 dimensi토토 승무패al Hubbard model. Extenti토토 승무패 to 2 dimensi토토 승무패 is currently underway, and possibly reported in the talk.