Talks

11269 - 11280 of 19186 Results

The Amplitude Mode in Condensed Matter : Higgs Hunting on a Budget

Daniel Arovas University of California, San Diego

November 19, 2013

PIRSA:13110054

Condensed Matter
New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar

Christopher Brust

November 19, 2013

PIRSA:13110051

High Energy Physics
13/14 PSI - Condensed Matter - Lecture 7

Anushya Chandran Perimeter Institute for Theoretical Physics

Roger Melko University of Waterloo

Xiao-Gang Wen Massachusetts Institute of Technology (MIT) - Department of Physics

November 19, 2013

PIRSA:13110035
13/14 PSI - Quantum Field Theory II - Lecture 7

Francois David CEA Saclay

November 19, 2013

PIRSA:13110016
13/14 PSI - Condensed Matter - Lecture 6

Anushya Chandran Perimeter Institute for Theoretical Physics

Roger Melko University of Waterloo

Xiao-Gang Wen Massachusetts Institute of Technology (MIT) - Department of Physics

November 18, 2013

PIRSA:13110034
13/14 PSI - Quantum Field Theory II - Lecture 6

Francois David CEA Saclay

November 18, 2013

PIRSA:13110015
Topological States in Strongly-Correlated Materials

Kai Sun University of Michigan–Ann Arbor

November 15, 2013

PIRSA:13110082

Condensed Matter
N-body lensed CMB maps: lensing extraction and characterization

Claudia Antolini SISSA International School for Advanced Studies

November 15, 2013

PIRSA:13110088

Astrophysics
13/14 PSI - Condensed Matter - Lecture 5

Anushya Chandran Perimeter Institute for Theoretical Physics

Roger Melko University of Waterloo

Xiao-Gang Wen Massachusetts Institute of Technology (MIT) - Department of Physics

November 15, 2013

PIRSA:13110031
13/14 PSI - Quantum Field Theory II - Lecture 5

Francois David CEA Saclay

November 15, 2013

PIRSA:13110012
Finite regions, spherical entanglement, and quantum gravity

Hal Haggard Bard College

November 14, 2013

PIRSA:13110049

General Relativity & Quantum Cosmology
Self-force and Green function in Schwarzschild spacetime via quasinormal modes and branch cut

Marc Casals Universität Leipzig

November 14, 2013

PIRSA:13110067

General Relativity & Quantum Cosmology

The Amplitude Mode in Condensed Matter : Higgs Hunting on a Budget

Daniel Arovas University of California, San Diego

November 19, 2013

PIRSA:13110054

Condensed Matter

The amplitude mode is a ubiquitous phenomenon in systems with broken continuous symmetry and effective relativistic dynamics, and has been observed in magnets, charge density waves, cold atom systems, and superconductors. It is a simple analog of the Higgs boson of particle physics. I will discuss the properties of the amplitude mode and its somewhat surprising visibility in two-dimensional systems, recently confirmed in cold atom experiments. The behavior in the vicinity of a quantum critical point will be stressed, comparing theoretical, numerical, and experimental results.
New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar

Christopher Brust

November 19, 2013

PIRSA:13110051

High Energy Physics

The effective number of neutrino species in our universe, Neff, is capable of probing the presence of new light or massless species in our universe. I will first review relevant facts about both CMB measurements of new light species and thermodynamics in the early universe. Then, I will present the effects of many models of BSM physics containing new light species on the CMB, including models containing eV-scale sterile neutrinos compatible with anomalies in neutrino experiments, and interpret the compatibility of the parameter space of these models in terms of the recent results from the Planck satellite. I will argue that the bounds on couplings obtained from the Planck measurement of the CMB are competitive with bounds coming from other areas of physics.
13/14 PSI - Condensed Matter - Lecture 7

Anushya Chandran Perimeter Institute for Theoretical Physics

Roger Melko University of Waterloo

Xiao-Gang Wen Massachusetts Institute of Technology (MIT) - Department of Physics

November 19, 2013

PIRSA:13110035
13/14 PSI - Quantum Field Theory II - Lecture 7

Francois David CEA Saclay

November 19, 2013

PIRSA:13110016
13/14 PSI - Condensed Matter - Lecture 6

Anushya Chandran Perimeter Institute for Theoretical Physics

Roger Melko University of Waterloo

Xiao-Gang Wen Massachusetts Institute of Technology (MIT) - Department of Physics

November 18, 2013

PIRSA:13110034
13/14 PSI - Quantum Field Theory II - Lecture 6

Francois David CEA Saclay

November 18, 2013

PIRSA:13110015
Topological States in Strongly-Correlated Materials

Kai Sun University of Michigan–Ann Arbor

November 15, 2013

PIRSA:13110082

Condensed Matter

In the study of strongly-correlated insulators, a long-standing puzzle remained open for over 40 years. Some Kondo insulators (or mixed-valent insulators) display strange electrical transport that cannot be understood if one assumes that it is governed by the three-dimensional bulk. In this talk, I show that some 3D Kondo insulators have the right ingredients to be topological insulators, which we called “topological Kondo insulators”. For a topological Kondo insulator, the low-temperature transport is dominated by the 2D surface rather than the 3D bulk, because the bulk of this material is an insulator while its surface is a topologically-protected 2D metal. This theoretical picture offers a natural explanation for the long-standing puzzle mentioned above. In addition, we also find that Kondo insulators can support another type of nontrivial topological structure protected by lattice symmetries, which we called “topological crystalline Kondo insulators”. In particular, we predict that SmB$_6$ is both a topological Kondo insulator and a topological crystalline Kondo insulator and I will also discuss recent experiments, which reveal the surface states in SmB$_6$.
N-body lensed CMB maps: lensing extraction and characterization

Claudia Antolini SISSA International School for Advanced Studies

November 15, 2013

PIRSA:13110088

Astrophysics

After multiple high precision detections (ACT, SPT, Planck) gravitational lensing has become a new source of relevant cosmological information: combining it with other probes (e.g. the large scale structure) can give significant insight on the evolution of the Dark Energy component. Developing new algorithms of estimate of this signal will allow the community to exploit this observable as a new and independent probe in cosmology. In my talk I will present the reconstruction of the lensing shear pattern and its angular power spectrum from total intensity and polarised CMB maps obtained using Born approximated ray-tracing through N-body simulated structures.The recovered spectra are in agreement with predictions of the underlying ΛCDM with no visible bias, on a scale interval which extends from the arcminute to several degrees over the sky. This demonstrates the feasibility of CMB lensing studies based on large scale simulations of cosmological structure formation in the context of the upcoming large observational campaigns.
13/14 PSI - Condensed Matter - Lecture 5

Anushya Chandran Perimeter Institute for Theoretical Physics

Roger Melko University of Waterloo

Xiao-Gang Wen Massachusetts Institute of Technology (MIT) - Department of Physics

November 15, 2013

PIRSA:13110031
13/14 PSI - Quantum Field Theory II - Lecture 5

Francois David CEA Saclay

November 15, 2013

PIRSA:13110012
Finite regions, spherical entanglement, and quantum gravity

Hal Haggard Bard College

November 14, 2013

PIRSA:13110049

General Relativity & Quantum Cosmology

An exciting frontier in physics is to understand the quantum nature of gravitation in finite regions of spacetime. Study of these regions from ``below'', that is, by studying the quantum geometry of finite regions emerging from loop gravity and spin networks has recently resulted in a new road to the quantization of volume and to evidence that there is a robust gap in the volume spectrum. In this talk I will complement these results with recent work on conformal field theories in a particular finite region, a spherical ball of space. This new view afforded from ``above" gives insights into entanglement and the Reeh-Schlieder theorem, allows calculation of the entanglement spectrum, and suggests a new route to constructing the Minkowski vacuum out of independent finite regions in quantum gravity.
Self-force and Green function in Schwarzschild spacetime via quasinormal modes and branch cut

Marc Casals Universität Leipzig

November 14, 2013

PIRSA:13110067

General Relativity & Quantum Cosmology

The modelling of gravitational wave sources is of timely interest given the exciting prospect of a first detection of gravitational waves by the new generation of detectors. The motion of a small compact object around a massive black hole deviates from a geodesic due to the action of its own field, giving rise to a self-force and the emission of gravitational waves. The self-force program has recently achieved important results using well-established methods. In this talk, we will present a different, novel method, where the self-force is calculated via the Green function of the wave equation that the field perturbation satisfies. We will present a calculation of the global Green function on Schwarzschild black hole spacetime. The calculation is carried out via a spectroscopy analysis of the Green function, which includes quasinormal modes and a branch cut in the complex-frequency plane. We will apply this analysis to calculate the self-force on a scalar charge and to reveal geometrical properties of wave propagation on a Schwarzschild background.

Title	Date	Collection	Type	Info
The Amplitude Mode in Condensed Matter : Higgs Hunting on a Budget	2013‑11‑19	Quantum Matter	Scientific Series	View details
New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar	2013‑11‑19	Particle Physics	Scientific Series	View details
13/14 PSI - Condensed Matter - Lecture 7	2013‑11‑19	13/14 PSI - Condensed Matter	Course	View details
13/14 PSI - Quantum Field Theory II - Lecture 7	2013‑11‑19	13/14 PSI - Quantum Field Theory II	Course	View details
13/14 PSI - Condensed Matter - Lecture 6	2013‑11‑18	13/14 PSI - Condensed Matter	Course	View details
13/14 PSI - Quantum Field Theory II - Lecture 6	2013‑11‑18	13/14 PSI - Quantum Field Theory II	Course	View details
Topological States in Strongly-Correlated Materials	2013‑11‑15	Quantum Matter	Scientific Series	View details
N-body lensed CMB maps: lensing extraction and characterization	2013‑11‑15	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Condensed Matter - Lecture 5	2013‑11‑15	13/14 PSI - Condensed Matter	Course	View details
13/14 PSI - Quantum Field Theory II - Lecture 5	2013‑11‑15	13/14 PSI - Quantum Field Theory II	Course	View details
Finite regions, spherical entanglement, and quantum gravity	2013‑11‑14	Quantum Gravity	Scientific Series	View details
Self-force and Green function in Schwarzschild spacetime via quasinormal modes and branch cut	2013‑11‑14	Strong Gravity	Scientific Series	View details

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Format results

The Amplitude Mode in Condensed Matter : Higgs Hunting on a Budget

New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar

13/14 PSI - Condensed Matter - Lecture 7

13/14 PSI - Quantum Field Theory II - Lecture 7

13/14 PSI - Condensed Matter - Lecture 6

13/14 PSI - Quantum Field Theory II - Lecture 6

Topological States in Strongly-Correlated Materials

N-body lensed CMB maps: lensing extraction and characterization

13/14 PSI - Condensed Matter - Lecture 5

13/14 PSI - Quantum Field Theory II - Lecture 5

Finite regions, spherical entanglement, and quantum gravity

Self-force and Green function in Schwarzschild spacetime via quasinormal modes and branch cut

The Amplitude Mode in Condensed Matter : Higgs Hunting on a Budget

New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar

13/14 PSI - Condensed Matter - Lecture 7

13/14 PSI - Quantum Field Theory II - Lecture 7

13/14 PSI - Condensed Matter - Lecture 6

13/14 PSI - Quantum Field Theory II - Lecture 6

Topological States in Strongly-Correlated Materials

N-body lensed CMB maps: lensing extraction and characterization

13/14 PSI - Condensed Matter - Lecture 5

13/14 PSI - Quantum Field Theory II - Lecture 5

Finite regions, spherical entanglement, and quantum gravity

Self-force and Green function in Schwarzschild spacetime via quasinormal modes and branch cut