BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Supersymmetry\, Ricci Flat Manifolds and the String Landscape  - B
 obby Acharya (ICTP/KCL)
DTSTART:20191114T130000Z
DTEND:20191114T140000Z
UID:TALK131113@talks.cam.ac.uk
CONTACT:Dr. Carl Turner
DESCRIPTION:A longstanding question in superstring/M theory is does it pre
 dict supersymmetry below the string scale? We formulate and discuss a nece
 ssary condition for this to be true\; this is the mathematical conjecture 
 that all stable\, compact Ricci flat manifolds have special holonomy in di
 mensions below eleven. Almost equivalent is the proposal that the landscap
 e of all geometric\, stable\, string/M theory compactifications to Minkows
 ki spacetime (at leading order) are supersymmetric. For simply connected m
 anifolds\, we collect together a number of physically relevant mathematica
 l results\, emphasising some key outstanding problems and perhaps less wel
 l known results. For non-simply connected\, non-supersymmetric Ricci flat 
 manifolds we demonstrate that many cases suffer from generalised Witten bu
 bble of nothing instabilities.
LOCATION:Potter Room (first floor\, Pav. B)
END:VEVENT
END:VCALENDAR