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UID:2416@qft.physik.hu-berlin.de
DTSTART;TZID=Europe/Berlin:20251203T133000
DTEND;TZID=Europe/Berlin:20251203T143000
DTSTAMP:20251202T083145Z
URL:https://qft.physik.hu-berlin.de/next-seminars/chia-hsien-shen-upsalla-
 taipeh/
SUMMARY:QFT-Colloquium: Chia-Hsien Shen\, (Uppsala U and Taiwan U) - 
DESCRIPTION:Speaker: Chia-Hsien Shen\, Uppsala University and National Taiw
 an University\n\nTitle: Positivity in EFT Renormalization: from Quantum Pa
 rticles to Classical Black Holes\n\nAbstract: Renormalization group (RG) e
 volution is a fundamental feature of quantum field theory\, playing a pivo
 tal role in both its formal structures and phenomenological applications i
 n particle physics and beyond. While the framework for calculating RG flow
 s is well established\, unexpected patterns continue to emerge. In this ta
 lk\, I will leverage fundamental principles—unitarity and analyticity—
 to constrain the direction of RG evolution in effective field theory that 
 shares a similar spirit as the a-theorem in conformal field theory. This r
 esult can be understood as an infrared avatar of positivity bound. For phe
 nomenological applications\, I will discuss examples in chiral perturbatio
 n theory and the Standard Model Effective Field Theory. I will also discus
 s a similar behavior in the renormalization of the dynamical tidal Love nu
 mbers of Schwarzschild black holes. This talk is based on 2505.02910 and w
 ork in progress.
CATEGORIES:Colloquia
LOCATION:Room 1.221\, IRIS building\, Zum großen Windkanal 6\, Berlin\, 12
 489\, Germany
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Zum großen Windkanal 6\, B
 erlin\, 12489\, Germany;X-APPLE-RADIUS=100;X-TITLE=Room 1.221\, IRIS build
 ing:geo:0,0
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