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Home » Seminars » IRFP conformal dynamics in many flavor lattice QCD in the light of thermal chiral phase transition

IRFP conformal dynamics in many flavor lattice QCD in the light of thermal chiral phase transition

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KMI Theory Seminar
2013-04-25 17:00
Kohtaroh Miura
KMI Science Symposia (ES635)

Novel (pre-)conformal phase associated with the infra-red fixed point (IRFP) is anticipated to emerge due to non-perturbative interactions in asymptotically free non-Abelian gauge theories when the number of fermion species (N_f) exceeds a critical value (N_f = N_f*). The pre-conformal dynamics has been advocated as a basis for strongly interacting mechanisms of electroweak symmetry breaking (walking technicolor scenario). Lattice Monte-Carlo simulations are now expected to provide a solid theoretical base for this new class of strongly interacting gauge theories. We first briefely review the general motivation to considering the IRFP (pre-) conformality. Then, we particularly investigate the IRFP conformality in colour SU(N_c=3) gauge theory with a variable number N_f of fundamental fermions by using lattice Monte-Carlo simulations. We evaluate the thermal chiral phase transition as a function of N_f, and propose three independent estimates of N_f*, which are consistent to each other within error-bars. This strongly indicates the existance of the conformal phase in large N_f region.