Speaker
Dr
Hiroki Ohata
(KEK)
Description
The Schwinger model (QED in 1+1 dims) describes confinement and nontrivial $\theta$ vacuum similar to QCD. In this presentation, I quantitatively reveal the confining properties in the Schwinger model at finite temperature and $\theta$ using the Monte Carlo method. The well-known sign problem is avoided using bosonization, in which the Dirac fermion is transformed into a scalar boson. We observe that the string tension for noninteger probe charge becomes negative near $\theta = \pi$ at low temperatures, which can be understood by the creation of a dynamical charge pair.
Reference:
H. Ohata, “Monte Carlo study of Schwinger model without the sign problem,”
JHEP 12 (2023) 007, arXiv:2303.05481.
Primary author
Dr
Hiroki Ohata
(KEK)
