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SUMMARY:Positivity bounds in effective field theories
DTSTART;VALUE=DATE-TIME:20190630T090000Z
DTEND;VALUE=DATE-TIME:20190630T093000Z
DTSTAMP;VALUE=DATE-TIME:20260517T092421Z
UID:indico-contribution-24@indico.itp.ac.cn
DESCRIPTION:Speakers: 周 双勇  (ICTS\, USTC)\nLocality\, unitarity and 
 analyticity are some of the most fundamental properties of quantum field t
 heory. I will show how requiring a local\, analytic\, unitary UV completio
 n for a low energy effective theory (EFT) can impose positivity bounds on 
 the Wilson coefficients of the EFT. These positivity bounds take the form 
 of constraints on combinations of the pole subtracted scattering amplitude
  and its derivatives. I will first demonstrate the main idea with the simp
 le case of a massive scalar field\, and then discuss the technical subtlet
 ies that arise when generalising to cases with nonzero spins. These positi
 vity pounds can be applied to any EFTs. As an illustration\, I will apply 
 these positivity bounds to a few well-known EFTs\, including galileon\, st
 andard model effective field theory and massive gravity.\n\nhttps://indico
 .itp.ac.cn/event/1/contributions/24/
LOCATION:新疆乌鲁木齐金谷大酒店 三楼会议室
URL:https://indico.itp.ac.cn/event/1/contributions/24/
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