Talks

14461 - 14472 of 22691 Results

Numerical detection of symmetry protected and symmetry enriched topological phases

Frank Pollmann Max Planck Institute for Physics, Munich (Werner-Heisenberg-Institut)

February 25, 2014

PIRSA:14020140

Condensed Matter
13/14 PSI - Beyond the Standard Model - Lecture 5

Robert Mann University of Waterloo

February 25, 2014

PIRSA:14020057
Spacetime approach to force-free magnetospheres - Lecture 2

Ted Jacobson University of Maryland, College Park

February 25, 2014

PIRSA:14020155
13/14 PSI - Quantum Information Review - Lecture 7

Andrew Childs University of Waterloo

February 25, 2014

PIRSA:14020079
Large Tensor-to-Scalar Ratio in Small-Field Inflation

Takeshi Kobayashi SISSA International School for Advanced Studies

February 25, 2014

PIRSA:14020152

High Energy Physics

Astrophysics
Spacetime approach to force-free magnetospheres - Lecture 1

Ted Jacobson University of Maryland, College Park

February 25, 2014

PIRSA:14020154
Probing the Small Scale Structure of Dark Matter with Indirect Detection

Sheldon Campbell Ohio State University

February 25, 2014

PIRSA:14020097

Astrophysics
13/14 PSI - Quantum Gravity Review - Lecture 6

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 25, 2014

PIRSA:14020068
Quantum Liquids and Turbulent Black Holes

Allan Adams Massachusetts Institute of Technology (MIT) - Department of Physics

February 24, 2014

PIRSA:14020141

High Energy Physics
13/14 PSI - Quantum Information Review - Lecture 6

Andrew Childs University of Waterloo

February 24, 2014

PIRSA:14020078
Quantum Many-body Dynamics with Matrix Product States

Martin Ganahl Sandbox AQ

February 24, 2014

PIRSA:14020156

Astrophysics

Condensed Matter
13/14 PSI - Quantum Gravity Review - Lecture 5

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 24, 2014

PIRSA:14020067

Numerical detection of symmetry protected and symmetry enriched topological phases

Frank Pollmann Max Planck Institute for Physics, Munich (Werner-Heisenberg-Institut)

February 25, 2014

PIRSA:14020140

Condensed Matter

A topological phase is a phase of matter which cannot be characterized by a local order parameter. We first introduce non-local order parameters that can detect symmetry protected topological (SPT) phases in 1D systems and then show how to generalize the idea to detect symmetry enriched topological (SET) phases in 2D. SET phases are new structures that occur in topologically ordered systems in the presence of symmetries. We introduce simple methods to detect the SET order directly from a complete set of topologically degenerate ground state wave functions. We first show how to directly determine the characteristic symmetry fractionalization of the quasiparticles from the reduced density matrix of the minimally entangled states. Second, we show how a simple generalization of a non-local order parameter can be measured to detect SETs. The usefulness of the proposed approached is demonstrated by examining two concrete model states which exhibit SET: (i) a spin-1 model on the honeycomb lattice and (ii) the resonating valence bond state on a kagome lattice. We conclude that the spin-1 model and the RVB state are in the same SET phases.
13/14 PSI - Beyond the Standard Model - Lecture 5

Robert Mann University of Waterloo

February 25, 2014

PIRSA:14020057
Spacetime approach to force-free magnetospheres - Lecture 2

Ted Jacobson University of Maryland, College Park

February 25, 2014

PIRSA:14020155
13/14 PSI - Quantum Information Review - Lecture 7

Andrew Childs University of Waterloo

February 25, 2014

PIRSA:14020079
Large Tensor-to-Scalar Ratio in Small-Field Inflation

Takeshi Kobayashi SISSA International School for Advanced Studies

February 25, 2014

PIRSA:14020152

High Energy Physics

Astrophysics

The production of gravitational waves from cosmic inflation > is normally bounded by the inflaton field excursion. This relation, > which is often referred to as the Lyth bound, claims that > observationally large gravitational waves are produced only if the > inflaton has a super-Planckian field range. In this talk I will point > out that this general belief is not necessarily true when there are > additional light fields producing density perturbations. Perturbations > seeded by the inflaton can be suppressed under such situations, thus > allow large gravitational waves to be produced even from small-field (i.e. > sub-Planckian) inflation. I will also show that the field bound is > taken over by the light field when the inflaton-induced perturbations > are suppressed, thus present a generalized form of the Lyth bound that > applies to the total field space. The calculations are rather simple, > so I will explain my work on a blackboard.
Spacetime approach to force-free magnetospheres - Lecture 1

Ted Jacobson University of Maryland, College Park

February 25, 2014

PIRSA:14020154
Probing the Small Scale Structure of Dark Matter with Indirect Detection

Sheldon Campbell Ohio State University

February 25, 2014

PIRSA:14020097

Astrophysics

Direct observation of the small scale structure of matter in the Universe provides potentially important information about a wealth of physics, from complex galaxy evolution processes to fundamental particle properties of dark matter. Detecting this fine structure in dark matter, though, is notoriously difficult. Dark matter indirect detection--through observation of radiation products of particle annihilation--may be the most direct method for observing small scale structure. However, in an observed signal, the amount of dark matter clustering is degenerate with the annihilation cross section. This talk outlines ways this degeneracy may be broken with indirect detection alone. Scenarios are discussed where either abundant substructure leads to discovery of annihilation radiation (revealing properties of the substructure), or a discovery strongly constrains the presence of significant dark matter halo substructure.
13/14 PSI - Quantum Gravity Review - Lecture 6

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 25, 2014

PIRSA:14020068
Quantum Liquids and Turbulent Black Holes

Allan Adams Massachusetts Institute of Technology (MIT) - Department of Physics

February 24, 2014

PIRSA:14020141

High Energy Physics

The physics of black hole horizons is intimately connected to the physics of quantum liquids. In this talk I will review the connection and draw lessons about quantum turbulence from black hole dynamics and vice versa. For example, gravitational dynamics reveal that quantum turbulence can behave very differently from normal fluid turbulence in 2d, with long-wavelength excitations rapidly dissolving into small fluctuations and dissipating as in a 3d normal liquid. Meanwhile, familiar facts about turbulent flows in normal fluids imply that the horizons of certain accreting black holes evolve in time as if they have a non-trivial fractal dimension.
13/14 PSI - Quantum Information Review - Lecture 6

Andrew Childs University of Waterloo

February 24, 2014

PIRSA:14020078
Quantum Many-body Dynamics with Matrix Product States

Martin Ganahl Sandbox AQ

February 24, 2014

PIRSA:14020156

Astrophysics

Condensed Matter

The talk is divided into two parts: in the first, I will talk about dynamics of far-from equilibrium initial states in different lattice models. I will present results of quench dynamics of the XXZ-Heisenberg magnet, where interesting physics emerges after quenching the system. Then I will present results for scattering of solitonic objects in different integrable and non-integrable lattice models. In the second part, I will talk about dynamics of impurity systems. There I will talk about how impurity spectral functions can be calculated using the Chebyshev technique, and how MPS can serve as a high resolution impurity solver for Dynamical Mean-Field Theory. Finally, I will show some results for steady-state currents through a quantum dot device.
13/14 PSI - Quantum Gravity Review - Lecture 5

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 24, 2014

PIRSA:14020067

Title	Date	Collection	Type	Info
Numerical detection of symmetry protected and symmetry enriched topological phases	2014‑02‑25	Quantum Matter	Scientific Series	View details
13/14 PSI - Beyond the Standard Model - Lecture 5	2014‑02‑25	13/14 PSI - Beyond the Standard Model	Course	View details
Spacetime approach to force-free magnetospheres - Lecture 2	2014‑02‑25	Spacetime approach to force-free magnetospheres	Course	View details
13/14 PSI - Quantum Information Review - Lecture 7	2014‑02‑25	13/14 PSI - Quantum Information Review	Course	View details
Large Tensor-to-Scalar Ratio in Small-Field Inflation	2014‑02‑25	Particle Physics	Scientific Series	View details
Spacetime approach to force-free magnetospheres - Lecture 1	2014‑02‑25	Spacetime approach to force-free magnetospheres	Course	View details
Probing the Small Scale Structure of Dark Matter with Indirect Detection	2014‑02‑25	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Quantum Gravity Review - Lecture 6	2014‑02‑25	13/14 PSI - Quantum Gravity Review	Course	View details
Quantum Liquids and Turbulent Black Holes	2014‑02‑24	Quantum Fields and Strings	Scientific Series	View details
13/14 PSI - Quantum Information Review - Lecture 6	2014‑02‑24	13/14 PSI - Quantum Information Review	Course	View details
Quantum Many-body Dynamics with Matrix Product States	2014‑02‑24	Quantum Matter	Scientific Series	View details
13/14 PSI - Quantum Gravity Review - Lecture 5	2014‑02‑24	13/14 PSI - Quantum Gravity Review	Course	View details

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Format results

Numerical detection of symmetry protected and symmetry enriched topological phases

13/14 PSI - Beyond the Standard Model - Lecture 5

Spacetime approach to force-free magnetospheres - Lecture 2

13/14 PSI - Quantum Information Review - Lecture 7

Large Tensor-to-Scalar Ratio in Small-Field Inflation

Spacetime approach to force-free magnetospheres - Lecture 1

Probing the Small Scale Structure of Dark Matter with Indirect Detection

13/14 PSI - Quantum Gravity Review - Lecture 6

Quantum Liquids and Turbulent Black Holes

13/14 PSI - Quantum Information Review - Lecture 6

Quantum Many-body Dynamics with Matrix Product States

13/14 PSI - Quantum Gravity Review - Lecture 5

Numerical detection of symmetry protected and symmetry enriched topological phases

13/14 PSI - Beyond the Standard Model - Lecture 5

Spacetime approach to force-free magnetospheres - Lecture 2

13/14 PSI - Quantum Information Review - Lecture 7

Large Tensor-to-Scalar Ratio in Small-Field Inflation

Spacetime approach to force-free magnetospheres - Lecture 1

Probing the Small Scale Structure of Dark Matter with Indirect Detection

13/14 PSI - Quantum Gravity Review - Lecture 6

Quantum Liquids and Turbulent Black Holes

13/14 PSI - Quantum Information Review - Lecture 6

Quantum Many-body Dynamics with Matrix Product States

13/14 PSI - Quantum Gravity Review - Lecture 5