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CATEGORIES:Part III Seminars
SUMMARY:Dynamical Tuning - Kevin Zhou
DTSTART;TZID=Europe/London:20180316T143000
DTEND;TZID=Europe/London:20180316T153000
UID:TALK103156AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/103156
DESCRIPTION:Now that we've found the Higgs\, what is there lef
 t to do? The Standard Model matches experiment bea
 utifully\, once its 19 free parameters are fixed\,
  but the parameters themselves are mysterious: sev
 eral appear to be unnaturally "fine tuned" to with
 in one part in a billion. These coincidences provi
 de clues towards more fundamental physics. In this
  talk\, I'll introduce models of "dynamical tuning
 "\, extensions of the Standard Model where the uni
 verse is made to tune itself. I'll begin by formul
 ating naturalness in the language of effective fie
 ld theory and Bayesian statistics. Then I'll discu
 ss the strong CP problem\, sketch its connection w
 ith the topological structure of the vacuum\, and 
 introduce the axion\, a model for dark matter whic
 h dynamically solves the strong CP problem. Finall
 y I'll discuss the relaxion\, a new proposal that 
 solves half of the Standard Model's problems with 
 a single particle. The talk will be directed at ph
 ysicists\, but will display some neat applications
  of statistics and algebraic topology for mathemat
 icians.
LOCATION:MR3
CONTACT:Loren E. Held
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