Estimados colegas y amigos,

Tenemos el agrado de anunciar el 55° Encuentro de la Red Strings@ar, a realizarse el viernes 1ro de noviembre en el IAFE, Ciudad Universitaria de Buenos Aires, desde las 9:50 hs.

El programa del 55° Encuentro será el siguiente:

9:50-10:00 Apertura

10:00-11:00 Eric Bergshoeff (University of Groningen)

El programa del 55° Encuentro será el siguiente:

9:50-10:00 Apertura

10:00-11:00 Eric Bergshoeff (University of Groningen)

An update on Massive Gravity

In this talk I will review the most recent developments in efforts to modify Einstein's theory of gravity by assigning a small but non-zero mass to the graviton, the carrier of the gravitational force.

11:00-11:30 Café

11:30-12:30 Alejandro Rosabal (Centro Atómico Bariloche)

11:30-12:30 Alejandro Rosabal (Centro Atómico Bariloche)

Extended geometry and gauged maximal supergravity

We consider generalized diffeomorphisms on an extended space associated to the U-duality group of gauged maximal supergravity in four dimensions (E_7). We derive dynamical fluxes taking values in the representations allowed by supersymmetry, and we obtain their quadratic constraints from gauge consistency conditions. A covariant generalized Ricci tensor is introduced, defined in terms of a connection for the generalized diffeomorphisms. We show that, for any torsionless and metric-compatible generalized connection, the Ricci scalar reproduces the scalar potential of gauged maximal supergravity. We comment on how these results can be extend in order to incorporate the space-time and how this extension leads to the tensor hierarchy of gauged maximal supergravity.

12:30-14:30 Almuerzo

14:30-15:30 Daniel Grumiller (Vienna University of Technology)

14:30-15:30 Daniel Grumiller (Vienna University of Technology)

Flat space holography in three dimensions

The holographic principle has its most precise realization within the AdS/CFT correspondence. If the principle is correct, however, it must be possible to realize it also in Minkowski space. I review some recent advances in three bulk dimensions, discuss generalizations to higher spin theories and point out some evidence for a new no-go result.

15:30-16:00 Café

16:00-17:00 Jan Rosseel (Vienna University of Technology)

16:00-17:00 Jan Rosseel (Vienna University of Technology)

3D Newton-Cartan supergravity

In this talk, we will discuss a supersymmetric version of Newton-Cartan gravity, i.e. a geometric reformulation of Newtonian gravity. After an introduction on the appearance of Newton-Cartan structures in physics, we will show how a non-trivial supersymmetric version of three-dimensional Newton-Cartan gravity can be obtained by gauging an N=2 super-Bargmann algebra. We will indicate how the existence of an absolute Newtonian time implies that only one of the two supersymmetries can be gauged, while the other one survives as a global supersymmetry. We will also show how, by performing a suitable gauge-fixing, the resulting system can be reduced to a description of a supersymmetric extension of the Newton potential. Finally, we will comment on the four-dimensional case.

Esperamos verlos el viernes 1ro de noviembre próximo.

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