BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:The Gravity Dual of Boundary Causality - Sebastian Fischetti (Impe
 rial)
DTSTART:20160527T120000Z
DTEND:20160527T130000Z
UID:TALK65890@talks.cam.ac.uk
CONTACT:43345
DESCRIPTION:In gauge/gravity duality\, points which are not causally relat
 ed on the boundary cannot be causally related through the bulk\; this is t
 he statement of boundary causality.  By the Gao-Wald theorem\, the average
 d null energy condition in the bulk is sufficient to ensure this property.
   Here I'll proceed in the converse direction by derving a necessary as we
 ll as sufficient condition for the preservation of boundary causality unde
 r perturbative (quantum or stringy) corrections to the bulk.  The resultin
 g condition is a (background-dependent) constraint on the amount by which 
 light cones can "open" over all null bulk geodesics. I'll show that this c
 onstraint is weaker than the averaged null energy condition\, and thus wea
 ker than the assumptions of the Gao-Wald theorem.
LOCATION:Pavilion B Potter Room (B1.19)
END:VEVENT
END:VCALENDAR