Talk
Center for Theory of Quantum Matter Seminar
When
· 12:00 PM MDT
Shown in the venue’s time zone (America/Denver), not yours.
Where
Duane Physics and Astrophysics, G126
Boulder, CO
Tickets
No on-sale date recorded
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What the source said
Confinement and mass generation without Goldstone Bosons: a new paradigm, presented by Professor Anna Hasenfratz Strongly coupled gauge theories are usually expected either to remain conformal or to generate a mass gap through spontaneous chiral symmetry breaking, accompanied by Goldstone bosons. I will discuss evidence for a different possibility in four-dimensional gauge-fermion systems: a confining, fully gapped phase with no bilinear chiral condensate and no Goldstone modes. This behavior is observed in massless SU(2) gauge theory with N_f=4)and SU(3) gauge theory with N_f=8, flavors, using staggered fermions. I will describe the role of taste-breaking interactions and the corresponding continuum effective theory, and review evidence that the transition between the gapped and conformal phases is continuous and possibly associated with a merger of infrared and ultraviolet fixed points. These systems may therefore define new strongly coupled continuum quantum field theories and suggest a broader paradigm for mass generation in four dimensions. CTQM Seminars start at 12:30pm, with lunch served starting at 12pm.