Speaker
Yurii Zhuravlov
(Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine)
Description
We introduce the effective form factors for one-dimensional lattice fermions with arbitrary phase shifts. We study tau functions defined as series of these form factors. On the one hand we perform the exact summation and present tau functions as Fredholm determinants in the thermodynamic limit. On the other hand simple expressions of form factors allow us to present the corresponding series as integrals of elementary functions. Using this approach we re-derive the asymptotics of static correlation functions of the XY quantum chain at finite temperature.
Primary authors
Yurii Zhuravlov
(Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine)
Olexandr Gamayun
Nikolai Iorgov
