*2018年 [#n19b6830] ***[[Seminar]] [#ve1588b2] 日時: April 24 (Tue.) 15:00-16:00 場所: Workshop room at CCS 講演者: Yuma Asano (KEK) タイトル: Phase transitions in the BMN matrix model -[http://www-het.ph.tsukuba.ac.jp/Seminar/tsukuba-only/2018/seminar20180424_Asan8t.pdf 2018/04/24:slides(pdf)] 日時: June 28 (Thu.) 14:00-15:00 場所: Workshop room at CCS 講演者: Enrico Rinaldi (RBRC) タイトル: New results on strongly-coupled theories near the conformal window 概要: Lattice gauge theory is a robust framework to study non-perturbative physics and it is amenable to numerical simulations. It has been successfully used to study the low-energy regime of QCD. Modern-day lattice simulation codes are actually flexible enough that users can change the theory being simulated: we can study different number of colors $N_c$, number of quarks $N_f$ and quarks in different representations $N_r$, in addition to the usual parameters, gauge coupling $\beta$ and quark masses $m_f$.These new theories, although interesting in their own rights as well-defined gauge theories, can be used as templates to study physics beyond the Standard Model (BSM). In particular, as tentative candidates for a dynamical mechanism to break the electroweak symmetry and replace the Higgs sector, they need to be close to the conformal window in order to satisfy stringent experimental constraints. I will report on a particular SU(3) gauge theory with 8 fermions in the fundamental representation. In particular I will highlight how lattice simulations of the flavor-singlet scalar and pseudoscalar spectrum compare to QCD and how the observed features in the spectrum indicate the possibility that the theory is very close to the conformal window. -[http://www-het.ph.tsukuba.ac.jp/Seminar/tsukuba-only/2018/seminar20180628_rinaldi.pdf 2018/06/28:slides(pdf)]