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UID:79@gravity.physik.fau.de
DTSTART;TZID=Europe/Berlin:20240124T133000
DTEND;TZID=Europe/Berlin:20240124T150000
DTSTAMP:20240117T094415Z
URL:https://www.gravity.physik.fau.de/events/dr-ding-ding-zoom-fudan-unive
 rsity-effective-dynamics-of-quantum-fluctuations-with-applications-to-cosm
 ology/
SUMMARY:Dr. Ding Ding (zoom)  (Fudan University) Effective dynamics of quan
 tum fluctuations with applications to cosmology
DESCRIPTION:Quantum fluctuations can be thought of as new degrees-of-freedo
 m (DoFs) on top of the original classical system. In this talk\, I will in
 troduce a (canonical) effective framework that encodes quantum fluctuation
 s as additional independent DoFs within an enlarged phase space. In this f
 ramework\, there is a dynamic two-way communication between classical vari
 ables and quantum fluctuations\, making it suitable for describing time-de
 pendent quantum backreaction.\nI will apply our effective framework to exa
 mples in both flat and curved spacetimes. We will discover the key roles p
 layed by spatial symmetries and the uncertainty principle. The former help
 s us decouple fluctuations from each other and minimize backreaction on ba
 ckground inhomogeneities. The uncertainty principle\, on the other hand\, 
 will help us select out minimal-energy configurations. At the leading orde
 r\, these configurations coincide with ones dictated by textbook (1PI) eff
 ective potentials.\nIf time permits I will mention some potential future a
 pplications.
CATEGORIES:Group Seminar
LOCATION:SR 02.729\, Staudtstraße 7/B2\, Erlangen\, 91058\, Germany
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Staudtstraße 7/B2\, Erlang
 en\, 91058\, Germany;X-APPLE-RADIUS=100;X-TITLE=SR 02.729:geo:0,0
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TZID:Europe/Berlin
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DTSTART:20231029T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
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