Talks

9577 - 9588 of 16763 Results

Spacetime approach to force-free magnetospheres - Lecture 1

Ted Jacobson University of Maryland, College Park

February 25, 2014

PIRSA:14020154
Large Tensor-to-Scalar Ratio in Small-Field Inflation

Takeshi Kobayashi SISSA International School for Advanced Studies

February 25, 2014

PIRSA:14020152

Particle Physics

Cosmology
Probing the Small Scale Structure of Dark Matter with Indirect Detection

Sheldon Campbell Ohio State University

February 25, 2014

PIRSA:14020097

Cosmology
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

Quantum Fields and Strings
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

Cosmology

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

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 24, 2014

PIRSA:14020067
13/14 PSI - Beyond the Standard Model - Lecture 4

Robert Mann University of Waterloo

February 24, 2014

PIRSA:14020056
13/14 PSI - Quantum Information Review - Lecture 5

Andrew Childs University of Waterloo

February 21, 2014

PIRSA:14020153
Sequestering the Standard Model Vacuum Energy

Nemanja Kaloper University of California, Davis

February 21, 2014

PIRSA:14020109

Particle Physics
13/14 PSI - Quantum Information Review - Lecture 4

Andrew Childs University of Waterloo

February 21, 2014

PIRSA:14020075

Spacetime approach to force-free magnetospheres - Lecture 1

Ted Jacobson University of Maryland, College Park

February 25, 2014

PIRSA:14020154
Large Tensor-to-Scalar Ratio in Small-Field Inflation

Takeshi Kobayashi SISSA International School for Advanced Studies

February 25, 2014

PIRSA:14020152

Particle Physics

Cosmology

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.
Probing the Small Scale Structure of Dark Matter with Indirect Detection

Sheldon Campbell Ohio State University

February 25, 2014

PIRSA:14020097

Cosmology

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

Quantum Fields and Strings

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

Cosmology

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
13/14 PSI - Beyond the Standard Model - Lecture 4

Robert Mann University of Waterloo

February 24, 2014

PIRSA:14020056
13/14 PSI - Quantum Information Review - Lecture 5

Andrew Childs University of Waterloo

February 21, 2014

PIRSA:14020153
Sequestering the Standard Model Vacuum Energy

Nemanja Kaloper University of California, Davis

February 21, 2014

PIRSA:14020109

Particle Physics

We propose a very simple reformulation of General Relativity, which completely sequesters from gravity {\it all} of the vacuum energy from a matter sector, including all loop corrections and renders all contributions from phase transitions automatically small. The idea is to make the dimensional parameters in the matter sector functionals of the 4-volume element of the universe. For them to be nonzero, the universe should be finite in spacetime. If this matter is the Standard Model of particle physics, our mechanism prevents any of its vacuum energy, classical or quantum, from sourcing the curvature of the universe. The mechanism is consistent with the large hierarchy between the Planck scale, electroweak scale and curvature scale, and early universe cosmology, including inflation. Consequences of our proposal are that the vacuum curvature of an old and large universe is not zero, but very small, that wDE≃−1 is a transient, and that the universe will collapse in the future.
13/14 PSI - Quantum Information Review - Lecture 4

Andrew Childs University of Waterloo

February 21, 2014

PIRSA:14020075

Title	Date	Collection	Type	Info
Spacetime approach to force-free magnetospheres - Lecture 1	2014‑02‑25	Spacetime approach to force-free magnetospheres	Course	View details
Large Tensor-to-Scalar Ratio in Small-Field Inflation	2014‑02‑25	Particle Physics	Scientific Series	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
13/14 PSI - Beyond the Standard Model - Lecture 4	2014‑02‑24	13/14 PSI - Beyond the Standard Model	Course	View details
13/14 PSI - Quantum Information Review - Lecture 5	2014‑02‑21	13/14 PSI - Quantum Information Review	Course	View details
Sequestering the Standard Model Vacuum Energy	2014‑02‑21	Particle Physics	Scientific Series	View details
13/14 PSI - Quantum Information Review - Lecture 4	2014‑02‑21	13/14 PSI - Quantum Information Review	Course	View details

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