Triangle Seminars
Tuesday, 25 Feb 2020
Graduate Lectures: Black Holes in AdS/CFT
Seok Kim
(Seoul National University)
Abstract:
Indices and protected spectrum
Indices and protected spectrum
Posted by: QMW
Wednesday, 26 Feb 2020
Graduate Lectures: Black Holes in AdS/CFT
Seok Kim
(Seoul National University)
Abstract:
Cardy limit and large black holes; comments on generalizations and other examples
Cardy limit and large black holes; comments on generalizations and other examples
Posted by: QMW
Color Confinement, Bose-Einstein Condensation and Holographic Emergent Space
📍 London
Masanori Hanada
(Southampton U.)
Abstract:
We propose a unified description of two important phenomena: color confinement in large-\(N\) gauge theory, and Bose-Einstein condensation (BEC). The key lies in relating standard criteria, based on off-diagonal long range order (ODLRO) for BEC and the Polyakov loop for gauge theory: the constant offset of the distribution of the phases of the Polyakov loop corresponds to ODLRO. Indistinguishability associated with the symmetry group –- SU(N) or O(N) in gauge theory, and S_N permutations in the system of identical bosons –- is crucial in either case. This viewpoint may have implications for confinement at finite N, and for quantum gravity via gauge/gravity duality. As a byproduct, we obtain a characterization of the partially-confined/partially-deconfined phase at finite coupling: the constant offset of the distribution of the phases of the Polyakov loop is the order parameter.
We propose a unified description of two important phenomena: color confinement in large-\(N\) gauge theory, and Bose-Einstein condensation (BEC). The key lies in relating standard criteria, based on off-diagonal long range order (ODLRO) for BEC and the Polyakov loop for gauge theory: the constant offset of the distribution of the phases of the Polyakov loop corresponds to ODLRO. Indistinguishability associated with the symmetry group –- SU(N) or O(N) in gauge theory, and S_N permutations in the system of identical bosons –- is crucial in either case. This viewpoint may have implications for confinement at finite N, and for quantum gravity via gauge/gravity duality. As a byproduct, we obtain a characterization of the partially-confined/partially-deconfined phase at finite coupling: the constant offset of the distribution of the phases of the Polyakov loop is the order parameter.
Posted by: KCL
Description:
After a short break, we're back with the Early Researcher Triangle Seminars! This time we have Rahim Leung from Imperial. Find details of the talk below.
Date: 26/02/2020 (Wednesday)
Time: 17:30
Place: North Wing B4, Strand Campus, King's College London
Title: Introduction to Supergravity
Abstract: In this seminar, I will provide a survey of a set of milestone solutions to supergravity. These solutions, ranging from the simple flat space solution, to the more intricate brane solutions, have brought about paradigm shifts in our understanding of supergravities and string theory as a whole. As part of this survey, I will start from the simplest solutions and move on to the more complicated ones, and show how they were first thought up and derived. One criticism of supergravities is that they do not allow solutions with a localised 4-dimensional de Sitter vacuua. I will show that there exists variant supergravities that support spacetimes with more than one time signature that do in fact admit localised 4-dimensional de Sitter vacuua, and that these theories can be related to the usual supergravities by a web of dualities. Hopefully, by the end of this seminar, you will all have a better understanding of how solutions to supergravity can be obtained, and if you already know all of these solutions beforehand, have a better appreciation of the importance of these solutions.
After a short break, we're back with the Early Researcher Triangle Seminars! This time we have Rahim Leung from Imperial. Find details of the talk below.
Date: 26/02/2020 (Wednesday)
Time: 17:30
Place: North Wing B4, Strand Campus, King's College London
Title: Introduction to Supergravity
Abstract: In this seminar, I will provide a survey of a set of milestone solutions to supergravity. These solutions, ranging from the simple flat space solution, to the more intricate brane solutions, have brought about paradigm shifts in our understanding of supergravities and string theory as a whole. As part of this survey, I will start from the simplest solutions and move on to the more complicated ones, and show how they were first thought up and derived. One criticism of supergravities is that they do not allow solutions with a localised 4-dimensional de Sitter vacuua. I will show that there exists variant supergravities that support spacetimes with more than one time signature that do in fact admit localised 4-dimensional de Sitter vacuua, and that these theories can be related to the usual supergravities by a web of dualities. Hopefully, by the end of this seminar, you will all have a better understanding of how solutions to supergravity can be obtained, and if you already know all of these solutions beforehand, have a better appreciation of the importance of these solutions.
Posted by: rishi.mouland@kcl.ac.uk
Thursday, 27 Feb 2020
Holographic Uhlmann Holonomy and the Entanglement Wedge Symplectic Form
Josh Kirklin
(University of Cambridge)
Abstract:
Subregion duality is an idea in holography which states that every subregion of the boundary theory has a corresponding subregion in the bulk theory, called the 'entanglement wedge', to which it is dual. In the classical limit of the gravity theory, we expect the fields in the entanglement wedge to permit a Hamiltonian description involving a phase space and Poisson brackets. In this talk, I will describe how this phase space arises from the point of view of the boundary theory. In particular, I will explain how it emerges from measurements of a certain quantum information-theoretic quantity, known as the 'Uhlmann phase', in the boundary subregion.
Subregion duality is an idea in holography which states that every subregion of the boundary theory has a corresponding subregion in the bulk theory, called the 'entanglement wedge', to which it is dual. In the classical limit of the gravity theory, we expect the fields in the entanglement wedge to permit a Hamiltonian description involving a phase space and Poisson brackets. In this talk, I will describe how this phase space arises from the point of view of the boundary theory. In particular, I will explain how it emerges from measurements of a certain quantum information-theoretic quantity, known as the 'Uhlmann phase', in the boundary subregion.
Posted by: QMW