Conveners
Parallel Session: Strings & Mathematical Physics
- Miguel Montero
Jean - Luc Lehners
(AEI Golm)
28/09/2017, 14:00
String & Mathematical Physics
I will discuss a fundamental obstruction to any theory of the beginning of the universe, formulated as a semiclassical path integral. Hartle and Hawking’s no boundary proposal and Vilenkin’s tunneling proposal are examples of such theories. Each may be formulated as the quantum amplitude for obtaining a final 3-geometry by integrating over 4-geometries. The result is obtained using a new...
Sebastian Bramberger
(MPI-AEI Golm)
28/09/2017, 14:20
String & Mathematical Physics
We study quantum mechanical tunneling using complex solutions of the classical field equations. Simple visualization techniques allow us to unify and generalize previous treatments, and straightforwardly show the connection to the standard approach using Euclidean instanton solutions. Applying these techniques to quantum cosmology we describe transitions between classical patches of the...
Martin Ammon
(Univ. of Jena)
28/09/2017, 14:40
String & Mathematical Physics
It is still an open question how general holographic dualities are, and what they possibly tell us about quantum gravity in asymptotically flat spacetimes. In this talk I will focus on a concrete example of an holographic duality involving higher spin gravity. In particular, I report on recent progress within three-dimensional higher spin gravity concerning the flat space limit and the soft...
Marcus Sperling
(Univ. Vienna)
28/09/2017, 15:00
String & Mathematical Physics
In this talk, I will discuss how the two geometric notions "fan" and
"monoid" can be very fruitful for the understanding of the Coulomb
branch Hilbert series (the monopole formula) for 3d N=4 gauge theories.
After a brief reminder of the monopole formula, I will introduce the
matter fan and reorganise the monopole formula accordingly. I then
discuss the resulting algebraic properties...
Cedric Troessaert
(MPI-AEI Golm)
28/09/2017, 15:20
String & Mathematical Physics
A few years ago Strominger argued that the BMS4 algebra, usually
defined at null infinity, should be regarded as a true symmetry of
gravitational evolution of asymptotically flat space-times. This
implies the existence of an infinite tower of conserved quantities
and brings new insight to various problems like gravitational
scattering or black-holes evaporation. In this talk, I will...
