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Time: Friday 10:00 - 11:30 am ET, Feb 23
Location: Harvard CMSA G10
Zoom:
https://harvard.zoom.us/j/977347126
Password: cmsa
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Motoo Suzuki (Harvard)
Title:
Spontaneously Broken (-1)-form symmetries
Abstract:
Spontaneous breaking of symmetries leads to universal phenomena. We
extend this notion to (−1)-form U(1) symmetries. The spontaneous
breaking is diagnosed by a dependence of the vacuum energy on a
constant background field θ, which can be probed by the topological
susceptibility. This leads to a reinterpretation of the Strong CP
problem as arising from a spontaneously broken instantonic symmetry in
QCD. We discuss how known solutions to the problem are unified in this
framework and explore some, so far unsuccessful, attempts to find new
solutions. I will also talk about our ongoing work on the explicit
breaking by monopoles.
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