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Gravitational anomaly and topological phases

Shinsei Ryu University of Illinois at Urbana-Champaign (UIUC)
February 28, 2013

PIRSA:13020148
Condensed Matter
Exploiting the Strong Gravitational Fields of Neutron Stars to Measure their Properties

Dimitrios Psaltis University of Arizona
February 28, 2013

PIRSA:13020126
General Relativity & Quantum Cosmology
12/13 PSI - Cosmology Review Lecture 8

Latham Boyle University of Edinburgh
February 28, 2013

PIRSA:13020108
Astrophysics
12/13 PSI - Quantum Information Review Lecture 8

Andrew Childs University of Waterloo
February 28, 2013

PIRSA:13020118
Quantum Physics
12/13 PSI - Beyond the Standard Model Lecture 8
- Itay Yavin McMaster University
- Natalia Toro Stanford University
February 28, 2013

PIRSA:13020098
High Energy Physics
Quantum Gravity as Random Geometry

Vincent Rivasseau University of Paris-Saclay
February 27, 2013

PIRSA:13020132
General Relativity & Quantum Cosmology
12/13 PSI - Cosmology Review Lecture 7

Latham Boyle University of Edinburgh
February 27, 2013

PIRSA:13020107
Astrophysics
12/13 PSI - Quantum Information Review Lecture 7

Andrew Childs University of Waterloo
February 27, 2013

PIRSA:13020117
Quantum Physics
12/13 PSI - Beyond the Standard Model Lecture 7
- Itay Yavin McMaster University
- Natalia Toro Stanford University
February 27, 2013

PIRSA:13020097
High Energy Physics
Advanced General Relativity - Lecture 11

Rafael Sorkin Perimeter Institute for Theoretical Physics

February 26, 2013

PIRSA:13020026
The universe as a process of unique events

Lee Smolin Perimeter Institute for Theoretical Physics
February 26, 2013

PIRSA:13020146
Quantum Physics
DMRG Studies on the Spin Liquid Ground State of the Kagome Model

Stefan Depenbrock Ludwig-Maximilians-Universität München (LMU)
February 26, 2013

PIRSA:13020147
Condensed Matter

Gravitational anomaly and topological phases

Shinsei Ryu University of Illinois at Urbana-Champaign (UIUC)
February 28, 2013

PIRSA:13020148
Condensed Matter
Since the quantum Hall effect, the notion of topological phases of matter has been extended to those that are well-defined (or: ``protected'') in the presence of a certain set of symmetries, and that exist in dimensions higher than two. In the (fractional) quantum Hall effects (and in ``chiral'' topological phases in general), Laughlin's thought experiment provides a key insight into their topological characterization; it shows a close connection between topological phases and quantum anomalies. By taking various examples, I will demonstrate that quantum anomalies serve as a useful tool to diagnose (and even define) topological properties of the systems. For chiral topological phases in (2+1) dimensions and (3+1) dimensional topological superconductors, I will discuss topological responses of the system which involve a cross correlation between thermal transport, angular momentum, and entropy. We also argue that gravitational anomaly is useful to study symmetry protected topological phases in (2+1) dimensions.
Exploiting the Strong Gravitational Fields of Neutron Stars to Measure their Properties

Dimitrios Psaltis University of Arizona
February 28, 2013

PIRSA:13020126
General Relativity & Quantum Cosmology
Neutron stars possess the strongest gravitational fields among stellar objects in the Universe that are not surrounded by a horizon. This causes the emission from their surfaces to be strongly lensed and deformed. Two upcoming space X-ray missions, ESA's LOFT and NASA's NICER, aim to use observations of lightcurves from spinning neutron stars to map their gravitational fields as well as measure their masses and radii. In this talk, I will discuss some unexpected strong-field phenomena that affect gravitational lensing in the vicinity of neutron stars. I will then show how we can use these phenomena to measure strong-field frame dragging and break degeneracies in the measured neutron-star masses and radii.
12/13 PSI - Cosmology Review Lecture 8

Latham Boyle University of Edinburgh
February 28, 2013

PIRSA:13020108
Astrophysics
12/13 PSI - Quantum Information Review Lecture 8

Andrew Childs University of Waterloo
February 28, 2013

PIRSA:13020118
Quantum Physics
12/13 PSI - Beyond the Standard Model Lecture 8
- Itay Yavin McMaster University
- Natalia Toro Stanford University
February 28, 2013

PIRSA:13020098
High Energy Physics
Quantum Gravity as Random Geometry

Vincent Rivasseau University of Paris-Saclay
February 27, 2013

PIRSA:13020132
General Relativity & Quantum Cosmology
Matrix models, random maps and Liouville field theory are prime tools which connect random geometry and quantum gravity in two dimensions. The tensor track is a new program to extend this connection to higher dimensions through the corresponding notions of tensor models, colored triangulations and tensor group field theories.
12/13 PSI - Cosmology Review Lecture 7

Latham Boyle University of Edinburgh
February 27, 2013

PIRSA:13020107
Astrophysics
12/13 PSI - Quantum Information Review Lecture 7

Andrew Childs University of Waterloo
February 27, 2013

PIRSA:13020117
Quantum Physics
12/13 PSI - Beyond the Standard Model Lecture 7
- Itay Yavin McMaster University
- Natalia Toro Stanford University
February 27, 2013

PIRSA:13020097
High Energy Physics
Advanced General Relativity - Lecture 11

Rafael Sorkin Perimeter Institute for Theoretical Physics

February 26, 2013

PIRSA:13020026
The universe as a process of unique events

Lee Smolin Perimeter Institute for Theoretical Physics
February 26, 2013

PIRSA:13020146
Quantum Physics
DMRG Studies on the Spin Liquid Ground State of the Kagome Model

Stefan Depenbrock Ludwig-Maximilians-Universität München (LMU)
February 26, 2013

PIRSA:13020147
Condensed Matter
I will present a density-matrix renormalization group (DMRG) study of the S=1/2 Heisenberg antiferromagnet on the kagome lattice to identify the conjectured spin liquid ground state. Exploiting SU(2) spin symmetry, which allows us to keep up to 16,000 DMRG states, we consider cylinders with circumferences up to 17 lattice spacings and find a spin liquid ground state with an estimated per site energy of -0.4386(5), a spin gap of 0.13(1), very short-range decay in spin, dimer and chiral correlation functions and finite topological entanglement consistent with the logarithm of 2, ruling out gapless, chiral or non-topological spin liquids. All this would provide strong evidence for a gapped topological Z_2 spin liquid.

Title	Date	Collection	Type	Info
Gravitational anomaly and topological phases	2013‑02‑28	Quantum Matter	Scientific Series	View details
Exploiting the Strong Gravitational Fields of Neutron Stars to Measure their Properties	2013‑02‑28	Strong Gravity	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 8	2013‑02‑28	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Quantum Information Review Lecture 8	2013‑02‑28	12/13 PSI - Quantum Information Review	Course	View details
12/13 PSI - Beyond the Standard Model Lecture 8	2013‑02‑28	12/13 PSI - Beyond the Standard Model	Course	View details
Quantum Gravity as Random Geometry	2013‑02‑27	Colloquium	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 7	2013‑02‑27	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Quantum Information Review Lecture 7	2013‑02‑27	12/13 PSI - Quantum Information Review	Course	View details
12/13 PSI - Beyond the Standard Model Lecture 7	2013‑02‑27	12/13 PSI - Beyond the Standard Model	Course	View details
Advanced General Relativity - Lecture 11	2013‑02‑26	Elements of General Relativity	Course	View details
The universe as a process of unique events	2013‑02‑26	Quantum Foundations	Scientific Series	View details
DMRG Studies on the Spin Liquid Ground State of the Kagome Model	2013‑02‑26	Quantum Matter	Scientific Series	View details

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Format results

Gravitational anomaly and topological phases

Exploiting the Strong Gravitational Fields of Neutron Stars to Measure their Properties

12/13 PSI - Cosmology Review Lecture 8

12/13 PSI - Quantum Information Review Lecture 8

12/13 PSI - Beyond the Standard Model Lecture 8

Quantum Gravity as Random Geometry

12/13 PSI - Cosmology Review Lecture 7

12/13 PSI - Quantum Information Review Lecture 7

12/13 PSI - Beyond the Standard Model Lecture 7

Advanced General Relativity - Lecture 11

The universe as a process of unique events

DMRG Studies on the Spin Liquid Ground State of the Kagome Model

Gravitational anomaly and topological phases

Exploiting the Strong Gravitational Fields of Neutron Stars to Measure their Properties

12/13 PSI - Cosmology Review Lecture 8

12/13 PSI - Quantum Information Review Lecture 8

12/13 PSI - Beyond the Standard Model Lecture 8

Quantum Gravity as Random Geometry

12/13 PSI - Cosmology Review Lecture 7

12/13 PSI - Quantum Information Review Lecture 7

12/13 PSI - Beyond the Standard Model Lecture 7

Advanced General Relativity - Lecture 11

The universe as a process of unique events

DMRG Studies on the Spin Liquid Ground State of the Kagome Model