
Seventh Joint Seminar  October 2021, 2011


Sezione INFN
Università di Roma "Tor Vergata"
Via della Ricerca Scientifica, 1
I00133 ROMA

Seminars will take place in U.M. Grassano lecture hall



14:00 

Team Meeting 





15:00 

A. Hanany, «Trivertices and SU(2)s»
Given a graph with lines and 3valent vertices, one can construct, via a simple dictionary, a Lagrangian with N=2 supersymmetry in 3+1 dimensions, generalizing the notion of quiver. The vacuum moduli space of such a theory gives moment map equations for a HyperKahler manifold. The Hilbert Series of these spaces can be computed and turns out to be a function of the number of external legs and loops in the graph but not of its detailed structure. The SCFT consequence of this property indicates a crucial universality of many Lagrangians, all of which have the same dynamics.


15:50 

C. Angelantonj, «A new look at modular integrals in string theory»
I will present a new way for evaluating modular integrals in String Theory that keeps all symmetries of the integrands manifest and induces a natural regularization of otherwise IR divergent integrals. It can be regarded as the equivalent of dimensional regularization in Field Theory. The procedure is particularly relevant for the quantum corrections to couplings in the lowenergy effective action, since the resulting expressions are manifestly invariant under the duality group.


16:40 

Coffee break 

17:00 

T.N. Tomaras, «Gravitational bremsstrahlung in ultraplanckian collisions»
I will discuss classical gravitational bremsstrahlung in massive particle collisions at ultraplanckian energies, with emphasis on the fact that the radiation efficiency is considerably larger than in previous estimates. As a result, I will argue that gravitational bremsstrahlung may lead to extreme damping in ultraplanckian collisions of massive particles and that radiation reaction should be included in the analysis of black hole production.






20:30 

Social dinner 



10:00 

L. Martucci, «Magnetized instantons in Ftheory»
I will discuss aspects of nonperturbative effects generated by Euclidean D3branes (E3branes) in Ftheory compactifications. The standard approach considers E3branes supporting vanishing worldvolume flux and is based on the dual Euclidean M5branes in Mtheory compactifications on elliptically fibered CalabiYau fourfolds. In contrast, I will propose an approach that is directly couched in type IIB. Not only will this open up an alternative perspective on known results, but it will also provide a framework to address problems which are more difficult to deal with in Mtheory. In particular, I will focus on the introduction of nonvanishing worldvolume fluxes on the E3branes and on the associated lifting of nonuniversal fermionic zeromodes.


10:50 

Coffee break 

11:10 

G. Bossard, «Interacting nonBPS black holes»
I will explain how to exploit systematically the structure of nilpotent orbits to obtain solvable equations describing extremal solutions of (super)gravity theories, i.e. systems that can be solved in a linear way. I will concentrate on the STU model, as a truncation of N=8 supergravity, for which all extremal solutions with a flat threedimensional base are fully described with the help of three different nilpotent orbits: the BPS, the almostBPS and the composite nonBPS. The latter describes a new class of multicenter black hole solutions for which all centers are nonBPS. I will discuss these solutions in some detail and I will address the generalization to N=8 supergravity.


12:00 

G. Dall'Agata, «New vacua of Mtheory reductions»
I will discuss a new method to find vacua of maximal gauged supergravity and its application to Mtheory reductions. I will show how to produce interesting Minkowski vacua with partial SUSY breaking using locally geometric compactifications and I will discuss new nonsupersymmetric Antide Sitter vacua and possible applications in the context of the gauge/gravity correspondence.


12:50 

End of the Meeting 


