Triangle Seminars
Monday, 7 Dec 2015
Exact Path Integral for 3D Quantum Gravity
📍 London
Akinori Tanaka
(RIKEN, Wako, JAPAN)
Abstract:
In 2007, it was conjectured by E.Witten that the chiral part of the partition function of 3d pure AdS Einstein gravity in quantum regime coincides with so-called modular J-function, a partition function of certain holomorphic CFT, called "monster CFT" considered by I. B Frenkel, J. Lepowsky and A. Meurman in the context of monstrous moonshine. We tried to calculate the partition function for the 3d pure AdS Einstein gravity directly by utilizing recently developed localization techniques.Based on some plausible assumptions, we arrived at CFT interpretations.For quantum gravity regime which corresponds to c=24, we get J-function.For semiclassical regime which corresponds c>>1, our partition function decomposes to Virasoro characters, and we derive Cardy formula. If possible, I will comment on application to quantum higher spin gravity.This talk is based on 1504.05991 and 1510.02142.
In 2007, it was conjectured by E.Witten that the chiral part of the partition function of 3d pure AdS Einstein gravity in quantum regime coincides with so-called modular J-function, a partition function of certain holomorphic CFT, called "monster CFT" considered by I. B Frenkel, J. Lepowsky and A. Meurman in the context of monstrous moonshine. We tried to calculate the partition function for the 3d pure AdS Einstein gravity directly by utilizing recently developed localization techniques.Based on some plausible assumptions, we arrived at CFT interpretations.For quantum gravity regime which corresponds to c=24, we get J-function.For semiclassical regime which corresponds c>>1, our partition function decomposes to Virasoro characters, and we derive Cardy formula. If possible, I will comment on application to quantum higher spin gravity.This talk is based on 1504.05991 and 1510.02142.
Posted by: KCL
Student Triangle Gong Show
Gong Show
(IC/KCL/CU/QMUL)
Abstract:
Student Triangles are a chance for PhD students to give talks to their fellow PhD students from the London Universities, without the pressure of presenting in front of academics. For this first student triangle of the year we will be holding a gong show with a series of short whiteboard talks. PhD students can sign up for a gong show slot on
http://doodle.com/poll/ehgri6kz6f6a8cux
Student Triangles are a chance for PhD students to give talks to their fellow PhD students from the London Universities, without the pressure of presenting in front of academics. For this first student triangle of the year we will be holding a gong show with a series of short whiteboard talks. PhD students can sign up for a gong show slot on
http://doodle.com/poll/ehgri6kz6f6a8cux
Posted by: QMW
Tuesday, 8 Dec 2015
tba
Nicola Perra
(Greenwich)
Wednesday, 9 Dec 2015
Gluing hexagons into three point functions
📍 London
Benjamin Basso
(ENS, Paris)
Abstract:
I will present a framework for computing correlators of three single trace operators in planar N=4 SYM theory that uses hexagonal patches as building blocks. This approach allows one to exploit the integrability of the theory and derive all loop predictions for its structure constants.
After presenting the main ideas and results, I will discuss recent perturbative tests and open problems.
I will present a framework for computing correlators of three single trace operators in planar N=4 SYM theory that uses hexagonal patches as building blocks. This approach allows one to exploit the integrability of the theory and derive all loop predictions for its structure constants.
After presenting the main ideas and results, I will discuss recent perturbative tests and open problems.
Posted by: KCL
Holographic thermo-electric transport properties and strange metals
Andrea Amoretti
(Cambridge)
Abstract:
Gauge/gravity duality can be used to study the transport
properties of strongly interacting systems with no quasi-particles. I
will give an overview of some holographic toy models of states like
this, in which momentum is not conserved and thus the transport of
energy and charge is non-trivial. Specifically I will discuss the
thermoelectric transport properties of these toy models and their
possible relations to the phenomenology of the strange metals.
Gauge/gravity duality can be used to study the transport
properties of strongly interacting systems with no quasi-particles. I
will give an overview of some holographic toy models of states like
this, in which momentum is not conserved and thus the transport of
energy and charge is non-trivial. Specifically I will discuss the
thermoelectric transport properties of these toy models and their
possible relations to the phenomenology of the strange metals.
Posted by: IC
Thursday, 10 Dec 2015
Extremal black holes with wiggles
Geoffrey Compere
(ULB)
Abstract:
Symmetries are crucial in physics. Here I will develop the concept
of symplectic symmetry for Einstein gravity, which is an extension
of the concept of asymptotic symmetries. I will then show that the
throat of the extremal Kerr black hole admits symplectic
symmetries, which leads to an infinite number of conserved charges
which form a Virasoro algebra in 4 dimensions and a novel
generalized Virasoro algebra in higher dimensions. I will build
explicitly the geometries that carry these charges, the so-called
"descendants" of the extremal black hole, in the near-horizon region.
Symmetries are crucial in physics. Here I will develop the concept
of symplectic symmetry for Einstein gravity, which is an extension
of the concept of asymptotic symmetries. I will then show that the
throat of the extremal Kerr black hole admits symplectic
symmetries, which leads to an infinite number of conserved charges
which form a Virasoro algebra in 4 dimensions and a novel
generalized Virasoro algebra in higher dimensions. I will build
explicitly the geometries that carry these charges, the so-called
"descendants" of the extremal black hole, in the near-horizon region.
Posted by: QMW