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SUMMARY:Decoupling limits in String and M-theory\, U-dualities and non-Lor
 entzian geometries  - Niels Obers\, Nordita and Niels Bohr Institute
DTSTART:20240502T120000Z
DTEND:20240502T130000Z
UID:TALK215731@talks.cam.ac.uk
CONTACT:Jackson Fliss
DESCRIPTION:I will revisit and extend near-BPS decoupling limits of type I
 I superstring theories and M-theory. These limits generalize the well-know
 n non-relativistic limit of a charged BPS particle. Consequently\, non-Lor
 entzian geometries naturally occur as curved target space geometries\, whi
 ch I will present along with their appearance in worldsheet and worldvolum
 e probe actions. These non-Lorentzian geometries are characterized by tang
 ent space symmetries that follow from Inönü-Wigner contractions of the M
 -theory superalgebra\, and include Newton-Cartan geometry and generalizati
 ons. I will discuss the duality web that unifies these decoupling limits a
 nd show how it connects different corners such as Matrix theories\, non-re
 lativistic string theory\, and non-relativistic M-theory. Furthermore\, I 
 will exhibit how tensionless string theory\, novel Carrollian string theor
 ies and Spin Matrix limits of AdS/CFT arise in the duality web. 
LOCATION:Potter Room (B1.19)
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