Subject: [Depfis] 67º encuentro de la red Strings@ar

From: [email-masked]
Date: Tue, 23 Aug 2016 12:23:09 -0300

Estimados colegas y amigos:

Tenemos el agrado de anunciar el 67º encuentro de la red Strings@ar, a
realizarse el jueves 25 de agosto en el IAFE, Ciudad Universitaria de
Buenos Aires, CABA.

El programa se detalla a continuación:

9:45-10:00hs  Apertura

10:00-11:00hs  Damián Galante
"Shape dependence of holographic Rényi entropies"

11:00-11:30hs  Cafe

11:30-12:30hs  Emmanuel Malek
"EFT, gauged SUGRAs and dualising IIA/IIB truncations"

12:30-14:00hs  Almuerzo

14:00-15:00hs  Sebastián Franchino-Viñas
"Worldline Formalism and Noncommutative Theories"

15:00-15:30hs  Cafe

15:30-16:30hs  Víctor Penas
"Dual Double Field Theory"

Esperamos verlos el jueves 25/8.

Saludos cordiales,

José Edelstein
Nicolás Grandi
Carmen Núñez
Martin Schvellinger

Abstracts:

Speaker: Damian Galante
Title: Shape dependence of holographic Rényi entropies.

Abstract: Rényi entropies in a QFT can be computed in principle using the
replica trick, which amounts to the insertion of a co-dimension two twist
operator in the path-integral. In a conformal field theory in the vacuum
state, the effect of small shape deformations around a spherical or flat
entangling surface is encoded in a piece of CFT data associated to this
defect. A method to extract this quantity holographically in general
dimensions is described. The result of this computation shows that previous
conjectures (based on free field theory results) do not hold for
holographic theories. Based on arXiv:1607.07418.

Speaker: Emmanuel Malek
Title: EFT, gauged SUGRAs and dualising IIA/IIB truncations

Abstract:  I will review the basics of exceptional field theories before
discussing their connection to maximal gauged SUGRAs. I will then show how
the framework can be used to deduce a ``duality'' between certain maximal
gauged SUGRAs. This will be shown explicitly for seven-dimensional and
four-dimensional gauged SUGRAs where the duality relates IIA / IIB
truncations on the same sphere / hyperboloidal backgrounds, although in
seven dimensions the resulting gauged SUGRAs are inequivalent.

Speaker: Victor Penas
Title: Dual Double Field Theory
Abstract: We present the dual formulation of double field theory at the
linearized level. This is a classically equivalent theory describing the
duals of the dilaton, the Kalb-Ramond field and the graviton in a
T-duality or O(D, D) covariant way.The resulting theory encodes fields in
mixed Young-tableau representations, combining them into an antisymmetric
4-tensor under O(D, D).

Speaker: Sebastían Franchino-Viñas
Title: Worldline Formalism and Noncommutative Theories

Abstract: Noncommutative quantum field theories are probably one of the
most important candidates to be an effective theory of quantum gravity. On
the other hand, the Worldline Formalism possesses great advantages in
comparison with a Feynman's diagram analysis of a theory. We then show how
to implement the worldline formalism in noncommutative theories. The result
is a master formula for the 1-loop effective action that is applied to a
number of scalar models -- among them the Grosse-Wulkenhaar model. This
model has some unusually kind properties of renormalization. As a byproduct
we find an expression for the small propertime expansion of general
nonlocal operators' Heat Kernel.

-- 
Strings@ar
A Theoretical Physics Network
www.fisica.unlp.edu.ar/strings