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SUMMARY:Low Energy? Think Positive! - Scott Melville (Cambridge)
DTSTART:20190214T160000Z
DTEND:20190214T170000Z
UID:TALK118057@talks.cam.ac.uk
CONTACT:Francesco Coradeschi
DESCRIPTION:At low energies\, the world around us can be described very ac
 curately using the Standard Model and General Relativity. However\, these 
 are at best only ``effective'' descriptions: valid at low energies but des
 tined to break down as experiments in particle physics and cosmology probe
  increasingly higher energies\, ultimately requiring a new (UV complete) t
 heory to take over.\nIn this talk\, I will review the constraints which mu
 st be placed on such low-energy Effective Field Theories if they are to ha
 ve any hope of a smooth Wilsonian UV completion at high energies (which is
  unitary\, causal and local). These constraints are known as ``positivity 
 bounds''.\nTo provide two illustrative examples\, I'll show how these boun
 ds can be used to constrain Beyond the Standard Model physics (such as the
  dimension-8 operators in SMEFT)\, and also constrain theories of modified
  gravity (such as massive gravity).\n\nSlides of the talk can be found "he
 re":http://www.hep.phy.cam.ac.uk/~conference/Scott_Melville_14-02-19.pdf
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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