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SUMMARY:Nonlinear Langevin dynamics via holography - Bidisha Chakrabarty (
 ICTS-TIFR Bangalore)
DTSTART:20191121T130000Z
DTEND:20191121T140000Z
UID:TALK131116@talks.cam.ac.uk
CONTACT:Dr. Carl Turner
DESCRIPTION:I will discuss the leading non-linear corrections to the Brown
 ian motion of a heavy quark moving through a strongly coupled CFT plasma (
 bath) using holographic Schwinger-Keldysh path integral. The bulk spacetim
 e in this formalism is a double copy of AdS black brane with a doubled str
 ing that probes it. The string stretches from two AdS boundaries and loops
  around a `horizon cap' connecting the horizons of the black branes. Evalu
 ating the Nambu Goto action on this doubled string configuration results i
 n the (quartic) influence phase of the heavy quark. The influence phase pa
 sses non-trivial consistency conditions arising from the underlying unitar
 ity and thermality of the bath. The local effective theory obeys recently 
 developed non-linear fluctuation dissipation relation that relates the non
 -Gaussianity of thermal noise to the thermal jitter in the damping constan
 t of the Brownian particle.
LOCATION:Potter Room (first floor\, Pav. B)
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