Triangle Seminars
Monday, 2 Oct 2017
AdS3/CFT2 and F-Theory
Christopher Couzens
(King's)
Abstract:
In this talk we consider holographic duals of F-theory solutions to 2d SCFT's. We approach the problem by classifying a particular class of solutions of type IIB supergravity with AdS_3 factors and varying axio-dilaton. The class of solutions we discuss consist of D3 and 7-brane configurations and naturally fall into the realm of F-theory. We prove that for (0,4) supersymmetry in 2d the solutions are essentially unique and we match the holographic central charges to field theory results. We comment on future directions, including AdS_3 solutions of F-theory, preserving different amounts of supersymmetry.
In this talk we consider holographic duals of F-theory solutions to 2d SCFT's. We approach the problem by classifying a particular class of solutions of type IIB supergravity with AdS_3 factors and varying axio-dilaton. The class of solutions we discuss consist of D3 and 7-brane configurations and naturally fall into the realm of F-theory. We prove that for (0,4) supersymmetry in 2d the solutions are essentially unique and we match the holographic central charges to field theory results. We comment on future directions, including AdS_3 solutions of F-theory, preserving different amounts of supersymmetry.
Posted by: CityU2
Tuesday, 3 Oct 2017
Neuro-Topology: An interaction between topology and neuroscience
Ran Levi
(Aberdeen)
Abstract:
While algebraic topology is now well established as an applicable branch of mathematics, its emergence in neuroscience is surprisingly recent. In this talk I will present a summary of an ongoing joint project with mathematician and neuroscientists. I will start with some basic facts on neuroscience and the digital reconstruction of a rat’s neocortex by the Blue Brain Project in EPFL. I will then explain how data emerging from this reconstruction can be mapped into abstract graphs that in turn give rise to certain mathematical objects in the realm of algebraic and combinatorial topology. Following a short introduction to some of the basic tools of algebraic topology, I will explain how they can potentially be used in the context of neuroscience. Having set up the scene, I will proceed by presenting the results of an ongoing collaboration with the Blue Brain Project team. In particular I shall demonstrate how the topological techniques give new insights on the behaviour of neural systems and inspire new directions in neuroscience research.
While algebraic topology is now well established as an applicable branch of mathematics, its emergence in neuroscience is surprisingly recent. In this talk I will present a summary of an ongoing joint project with mathematician and neuroscientists. I will start with some basic facts on neuroscience and the digital reconstruction of a rat’s neocortex by the Blue Brain Project in EPFL. I will then explain how data emerging from this reconstruction can be mapped into abstract graphs that in turn give rise to certain mathematical objects in the realm of algebraic and combinatorial topology. Following a short introduction to some of the basic tools of algebraic topology, I will explain how they can potentially be used in the context of neuroscience. Having set up the scene, I will proceed by presenting the results of an ongoing collaboration with the Blue Brain Project team. In particular I shall demonstrate how the topological techniques give new insights on the behaviour of neural systems and inspire new directions in neuroscience research.
Posted by: CityU2
Wednesday, 4 Oct 2017
The topologically twisted index on H2xS1 and its relation to the entropy of hyperbolic AdS4 black holes.
📍 London
Alejandro Cabo-Bizet
(KCL)
Abstract:
I will start by sketching the computation of the topologically
twisted index on H2xS1 and its evaluation in ABJM theory in the large N
limit with k=1.
Then after, I will review the key points behind the construction of
magnetically charged (hyperbolic) AdS4 black holes on STU gauged SUGRA and
will conclude by stating how the aformentioned index – upon extremization
– coincides with the entropy of the latter black holes in the large N
limit (with k=1).
I will start by sketching the computation of the topologically
twisted index on H2xS1 and its evaluation in ABJM theory in the large N
limit with k=1.
Then after, I will review the key points behind the construction of
magnetically charged (hyperbolic) AdS4 black holes on STU gauged SUGRA and
will conclude by stating how the aformentioned index – upon extremization
– coincides with the entropy of the latter black holes in the large N
limit (with k=1).
Posted by: KCL
TBA
Nabil Iqbal
(Durham)
Thursday, 5 Oct 2017
On self-dual N=4 theories
Inaki Garcia Etxebarria
(MPI Munich)