Linear broadening of the confining string in Yang-Mills theory at low temperature

Understand

The logarithmic broadening predicted by the systematic low-energy effective field theory for the confining string has recently been verified in numerical simulations of (2+1)-d SU(2) lattice Yang-Mills theory at zero temperature.

• The same effective theory predicts linear broadening of the string at low non-zero temperature.
• In this paper, we verify this prediction by comparison with very precise Monte Carlo data.
• The comparison involves no additional adjustable parameters, because the low-energy constants of the effective theory have already been fixed at zero temperature.