[Todos] 67º encuentro de la red Strings en ar

[Strings@ar Network]

Estimados colegas y amigos:


Tenemos el agrado de anunciar el 67º encuentro de la red Strings en 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

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


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: 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.

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