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Selection effects for the theta angle of QCD

14/02/2018 dalle 15:00 alle 16:00

Dove Aula Teorici, via Irnerio 46, Bologna

Contatto di riferimento ; Gian Paolo Vacca

Partecipanti Dr. Lorenzo Ubaldi: SISSA - Trieste

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Abstract: After a brief introduction to the strong CP problem, I review the common lore that there is no anthropic argument to select a tiny value of the QCD theta angle. Then I examine a recent proposal that connects the theta-dependent QCD vacuum energy to the cosmological constant. I argue that, even in this case, selection effects do not favor a small value of theta.