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SUMMARY:On the high energy scattering and absorption of strings by D-brane
 s - Giuseppe D'Appollonio - University of Cagliari
DTSTART:20160204T130000Z
DTEND:20160204T140000Z
UID:TALK62858@talks.cam.ac.uk
CONTACT:Nima Doroud
DESCRIPTION:I will first review how the dynamics of a closed string in the
  presence of a stack of parallel D-branes is neatly described\, in a suita
 ble range of parameters\, by an eikonal operator that encodes both classic
 al gravity effects (deflection angle\, time delay) and stringy corrections
  (tidal excitations of the string).\n\nI will then focus on the region of 
 parameters where the absorption of the closed string becomes the dominant 
 effect. I will derive a compact and explicit expression for the quantum st
 ate of the open string created at tree level on the branes worldvolume. I 
 will discuss some properties of this state (angular momentum\, longitudina
 l and transverse extension) and compare them with the properties of the co
 rresponding semiclassical solution that describes the closed-open transiti
 on.
LOCATION:Potter Room (first floor\, Pav. B)
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