Talks

11209 - 11220 of 19283 Results

Asymptotically Optimal Topological Quantum Compiling

Vadym Kliuchnikov University of Waterloo

October 30, 2013

PIRSA:13100129

Quantum Physics
Gravity and the Search for New Physics with Cosmology

Kris Sigurdson University of British Columbia

October 30, 2013

PIRSA:13100098

High Energy Physics
General Relativity for Cosmology - Lecture 13

Achim Kempf University of Waterloo

October 29, 2013

PIRSA:13100005
Silicene - a Wonder Electron Carpet

Baskaran Ganapathy Institute of Mathematical Sciences

October 29, 2013

PIRSA:13100128

Condensed Matter
The Geometry of Supersymmetric Partition Functions

Guido Festuccia Institute for Advanced Study (IAS) - School of Mathematics

October 29, 2013

PIRSA:13100130

High Energy Physics
Minimal Distances and the RG Flow

October 29, 2013

PIRSA:13100069

High Energy Physics
Mapping Mass Across The Sky: CMB Lensing Measurements Past and Future

Blake Sherwin Princeton University

October 29, 2013

PIRSA:13100075

Astrophysics
13/14 PSI - Quantum Field Theory I - Lecture 13

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 25, 2013

PIRSA:13100038
TBA

Johannes Walcher McGill University

October 25, 2013

PIRSA:13100127
13/14 PSI - Statistical Mechanics - Lecture 14

Anton Burkov University of Waterloo

October 25, 2013

PIRSA:13100062
The mathematics of G_2 conifolds for M-theory

Spiro Karigiannis University of Waterloo

October 25, 2013

PIRSA:13100126
Heterotic Flux Geometry from (0,2) Gauge Dynamics

Callum Quigley Kirkland & Ellis

October 24, 2013

PIRSA:13100125

Asymptotically Optimal Topological Quantum Compiling

Vadym Kliuchnikov University of Waterloo

October 30, 2013

PIRSA:13100129

Quantum Physics

In a topological quantum computer, universality is achieved by braiding and quantum information is natively protected from small local errors. We address the problem of compiling single-qubit quantum operations into braid representations for non-abelian quasiparticles described by the Fibonacci anyon model. We develop a probabilistically polynomial algorithm that outputs a braid pattern to approximate a given single-qubit unitary to a desired precision. We also classify the single-qubit unitaries that can be implemented exactly by a Fibonacci anyon braid pattern and present an efficient algorithm to produce their braid patterns. Our techniques produce braid patterns that meet the uniform asymptotic lower bound on the compiled circuit depth and thus are depth-optimal asymptotically. Our compiled circuits are significantly shorter than those output by prior state-of-the-art methods, resulting in improvements in depth by factors ranging from 20 to 1000 for precisions ranging between 10^{−10} and 10^{−30}.
Gravity and the Search for New Physics with Cosmology

Kris Sigurdson University of British Columbia

October 30, 2013

PIRSA:13100098

High Energy Physics

Despite its feeble in strength, gravity plays a pivotal role in shaping our Universe and the things in it. Ever since Newton formulated his universal law of gravitation the recognition that all things gravitate has been nearly sacrosanct. Repeatedly, apparent gravitational anomalies have either foretold the existence of new physics or a misunderstanding of gravity itself, from the existence of nuclear forces to Einstein's general relativity. Eighty years ago gravity betrayed the existence of dark matter, and fifteen years ago gravity demanded dark energy from reluctant cosmologists. I will discuss how gravity enables modern cosmology to explore the echoes of the invisible universe, even if it is impossible or difficult to directly see the invisible universe. In particular, I will show how gravity enables us to put surprisingly severe constraints on the coupling of dark matter to new light particles and search for secret interactions between Fermi's elusive neutrinos. The physics and cosmic history of the invisible universe are writ large across the cosmos itself, and gravity is our tried and trusted messenger.
General Relativity for Cosmology - Lecture 13

Achim Kempf University of Waterloo

October 29, 2013

PIRSA:13100005
Silicene - a Wonder Electron Carpet

Baskaran Ganapathy Institute of Mathematical Sciences

October 29, 2013

PIRSA:13100128

Condensed Matter

Graphene is a 2 dimensional net of strongly bonded carbon atoms. This magic carpet has taken us to new heights in the last decade. Silicene and Germanene are analogue nets, made of silicon and germanium atoms respectively, but with a relatively weaker chemical bond. I will argue that these carpets perform some new tricks by not being a carbon copy of graphene. We have suggested [1] that silicene and germanene are Mott insulators and potential abode for room temperature superconductivity, quantum spin liquids and more
The Geometry of Supersymmetric Partition Functions

Guido Festuccia Institute for Advanced Study (IAS) - School of Mathematics

October 29, 2013

PIRSA:13100130

High Energy Physics

Three-dimensional N=2 theories with a U(1)_R symmetry, can be placed on a compact three manifold M preserving some supersymmetry if and only if M admits a transversely holomorphic foliation (THF). I will show that the partition function of the resulting theory is independent of the metric and depends holomorphically on the moduli of the THF. When applied to supersymmetric field theories on manifolds diffeomorphic to S^3 and S^2 x S^1, this result explains many of the properties observed in explicit determinations of their partition functions.
Minimal Distances and the RG Flow

October 29, 2013

PIRSA:13100069

High Energy Physics

We will discuss the renormalization group flow between different classes of CFTs in four dimensions and study possible lower bounds on the "distances" between these theories.
Mapping Mass Across The Sky: CMB Lensing Measurements Past and Future

Blake Sherwin Princeton University

October 29, 2013

PIRSA:13100075

Astrophysics

Measurements of gravitational lensing in the Cosmic Microwave Background (CMB) directly probe the projected distribution of dark matter out to high redshifts. The CMB lensing maps thus encode a wealth of information about both fundamental physics (e.g., dark energy and neutrino properties) and high-redshift astrophysics. I will illustrate this by first reviewing measurements of CMB lensing with the Atacama Cosmology Telescope, discussing both CMB lensing auto-correlations and cross-correlations with quasars, galaxies and optical lensing. I will then discuss ongoing and upcoming measurements of CMB polarization lensing with the POLARBEAR and ACTPol experiments and explain the great scientific potential of such polarization lensing studies in the very near future.
13/14 PSI - Quantum Field Theory I - Lecture 13

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 25, 2013

PIRSA:13100038
TBA

Johannes Walcher McGill University

October 25, 2013

PIRSA:13100127
13/14 PSI - Statistical Mechanics - Lecture 14

Anton Burkov University of Waterloo

October 25, 2013

PIRSA:13100062
The mathematics of G_2 conifolds for M-theory

Spiro Karigiannis University of Waterloo

October 25, 2013

PIRSA:13100126

G_2 manifolds play the analogous role in M-theory that Calabi-Yau manifolds play in string theory. There has been work in the physics community on conjectural "mirror symmetry" in this context, and it has also been observed that singularities are necessary for a satisfactory theory. After a very brief review of these physical developments (by a mathematician who doesn't necessarily understand the physics), I will give a mathematical introduction to G_2 conifolds. I will then proceed to give a detailed survey of recent mathematical developments on G_2 conifolds, including desingularization, deformation theory, and possible constructions of G_2 conifolds. This includes separate joint works of myself with Jason Lotay and with Dominic Joyce.
Heterotic Flux Geometry from (0,2) Gauge Dynamics

Callum Quigley Kirkland & Ellis

October 24, 2013

PIRSA:13100125

Chiral gauge theories in two dimensions with (0,2) supersymmetry admit a much broader, and more interesting, class of vacuum solutions than their better studied (2,2) counterparts. In this talk, we will explore some of the possibilities that are offered by this additional freedom by including field-dependent theta-angles and FI parameters. The moduli spaces that will result from this procedure correspond to heterotic string backgrounds with non-trivial H-flux and NS-brane sources. Along the way, a remarkable relationship between (0,2) gauge anomalies and H-flux will emerge.

Title	Date	Collection	Type	Info
Asymptotically Optimal Topological Quantum Compiling	2013‑10‑30	Perimeter Institute Quantum Discussions	Scientific Series	View details
Gravity and the Search for New Physics with Cosmology	2013‑10‑30	Colloquium	Scientific Series	View details
General Relativity for Cosmology - Lecture 13	2013‑10‑29	General Relativity for Cosmology - 2013	Course	View details
Silicene - a Wonder Electron Carpet	2013‑10‑29	Quantum Matter	Scientific Series	View details
The Geometry of Supersymmetric Partition Functions	2013‑10‑29	Quantum Fields and Strings	Scientific Series	View details
Minimal Distances and the RG Flow	2013‑10‑29	Particle Physics	Scientific Series	View details
Mapping Mass Across The Sky: CMB Lensing Measurements Past and Future	2013‑10‑29	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Quantum Field Theory I - Lecture 13	2013‑10‑25	13/14 PSI - Quantum Field Theory I	Course	View details
TBA	2013‑10‑25	Physics Around Mirror Symmetry	Conference	View details
13/14 PSI - Statistical Mechanics - Lecture 14	2013‑10‑25	13/14 PSI - Statistical Mechanics	Course	View details
The mathematics of G_2 conifolds for M-theory	2013‑10‑25	Physics Around Mirror Symmetry	Conference	View details
Heterotic Flux Geometry from (0,2) Gauge Dynamics	2013‑10‑24	Physics Around Mirror Symmetry	Conference	View details

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Format results

Asymptotically Optimal Topological Quantum Compiling

Gravity and the Search for New Physics with Cosmology

General Relativity for Cosmology - Lecture 13

Silicene - a Wonder Electron Carpet

The Geometry of Supersymmetric Partition Functions

Minimal Distances and the RG Flow

Mapping Mass Across The Sky: CMB Lensing Measurements Past and Future

13/14 PSI - Quantum Field Theory I - Lecture 13

TBA

13/14 PSI - Statistical Mechanics - Lecture 14

The mathematics of G_2 conifolds for M-theory

Heterotic Flux Geometry from (0,2) Gauge Dynamics

Asymptotically Optimal Topological Quantum Compiling

Gravity and the Search for New Physics with Cosmology

General Relativity for Cosmology - Lecture 13

Silicene - a Wonder Electron Carpet

The Geometry of Supersymmetric Partition Functions

Minimal Distances and the RG Flow

Mapping Mass Across The Sky: CMB Lensing Measurements Past and Future

13/14 PSI - Quantum Field Theory I - Lecture 13

TBA

13/14 PSI - Statistical Mechanics - Lecture 14

The mathematics of G_2 conifolds for M-theory

Heterotic Flux Geometry from (0,2) Gauge Dynamics