strings@ar
XXXIII Encuentro de la red
strings@ar.
Lunes 13 de octubre de 2008,
IAFE
PROGRAMA
XXXIII Encuentro de la red
strings@ar - Programa (póster para imprimir)
|
Lunes 13 de octubre de 2008
IAFE, Ciudad Universitaria, Buenos Aires
|
09h50 - 10h00
|
Apertura
|
10h00 - 11h00
|
Juan Maldacena (IAS, Princeton)
Chern Simons matter theories in 2+1 dimensions with six
supersymmetries and gravity
|
11h00 - 11h30
|
Café
|
11h30 - 12h30
|
Carmen Núñez (IAFE, Buenos Aires)
Fusion rules and four-point functions in the SL(2,R)
WZNW model
|
12h30 - 14h00
|
Almuerzo
|
14h00 - 15h00
|
Harald Ita (UCLA, Los Angeles)
The No-Triangle Hypothesis and unexpected cancellations in
gravity theories
|
15h00 - 15h30
|
Café
|
15h30 - 16h30
|
Alan Garbarz (UBA, Buenos Aires)
A boundary stress tensor for Topologically Massive
Gravity
|
Juan Maldacena (IAS, Princeton)
Chern Simons matter theories in 2+1 dimensions
with six supersymmetries and gravity
We consider a Chern Simons matter theory in 2+1 dimensions with
six supercharges. This theory is related to N M2 branes on an
R8/Zk singularity. We realize this theory as
the low energy
limit of some brane system and we explain how it is related to
M2 branes. This gives us an example of
AdS4/CFT3 with a
tunable coupling constant.
Harald Ita (UCLA, Los Angeles)
The No-Triangle Hypothesis and unexpected
cancellations in gravity theories
Recent computations of scattering amplitudes show that N=8
supergravity is surprisingly well behaved in the ultraviolet and may
even be ultraviolet finite in perturbation theory. The novel
cancellations necessary for ultraviolet finiteness first appear at
one loop in the guise of the "no-triangle hypothesis".
We will consider one-loop amplitudes in N=8 supergravity and
discuss the "no-triangle hypothesis". We will then turn to one-loop
amplitudes in pure Einstein gravity and point out the existence of
cancellations similar to those found previously in N=8
supergravity. These cancellations go beyond those found in the
one-loop effective action.
Using unitarity, this suggests that generic theories of quantum
gravity based on the Einstein-Hilbert action may be better behaved in
the ultraviolet at higher loops than suggested by naive power
counting, though without additional (supersymmetric) cancellations
they diverge.