Speaker
Kari Rummukainen
(University of Helsinki)
Description
In phenomeologically acceptable technicolor theories the gauge coupling evolves very slowly, "walks", over a specific range of energies. Thus, the beta-function of the theory has a near-zero at a non-zero value of the coupling constant, where the theory becomes almost conformal. Because the almost-fixed point is at relatively strong coupling, non-perturbative lattice simulations are required for reliable investigations of these theories. In recent years these theories have attracted a lot of interest from the lattice community. In this talk I review the progress, problems and prospects in studies of some candidate theories with an fixed point or almost-fixed point, concentrating on the theory with SU(2) gauge fields and two flavours of adjoint representation fermions.
