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Frustrated Magnets and Quantum Spin Liquids

Steven White University of California, Irvine
March 20, 2013

PIRSA:13030097
Condensed Matter
12/13 PSI - Explorations in Particle Theory Lecture 3

David Morrissey TRIUMF
March 20, 2013

PIRSA:13030067
High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 3

David Cory Institute for Quantum Computing (IQC)
March 20, 2013

PIRSA:13030056
Quantum Physics
Advanced General Relativity - Lecture 17

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 19, 2013

PIRSA:13030020
Evidence for a new particle on the worldsheet of the QCD flux tube

Sergei Dubovsky New York University (NYU)
March 19, 2013

PIRSA:13030109
High Energy Physics
Learning what the Higgs is mixed with

Kunal Kumar Carleton University
March 19, 2013

PIRSA:13030089
High Energy Physics
The Effective Field Theory of Large Scale Structures

Enrico Pajer Utrecht University
March 19, 2013

PIRSA:13030110
Astrophysics
12/13 PSI - Explorations in Particle Theory Lecture 2

David Morrissey TRIUMF
March 19, 2013

PIRSA:13030066
High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 2

David Cory Institute for Quantum Computing (IQC)
March 19, 2013

PIRSA:13030055
Quantum Physics
12/13 PSI - Explorations in Particle Theory Lecture 1

David Morrissey TRIUMF
March 18, 2013

PIRSA:13030065
High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 1

David Cory Institute for Quantum Computing (IQC)
March 18, 2013

PIRSA:13030054
Quantum Physics
Advanced General Relativity - Lecture 16

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 14, 2013

PIRSA:13030015

Frustrated Magnets and Quantum Spin Liquids

Steven White University of California, Irvine
March 20, 2013

PIRSA:13030097
Condensed Matter
A quantum spin liquid is a solid whose atoms have magnetic moments but, because of quantum fluctuations, these moments fluctuate like a liquid even at zero temperature. Two dimensional spin liquids have been suggested as a way to produce high temperature superconductivity, and to build quantum computers. Just as helium is the only element which is a liquid at zero temperature, 2D spin liquids have been extremely difficult to find, despite decades of effort, raising the question, do realistic spin liquids even exist?
Recently, apparent spin liquids have been found experimentally, stimulating theoretical work to find simple model Hamiltonians of frustrated spin systems that have spin liquid ground states.

In this talk, I will give a broad overview of spin liquids and then focus on our simulations of the kagome Heisenberg model, a simple, realistic model of some of the recent experimental spin liquids, where we find a spin liquid ground state.
12/13 PSI - Explorations in Particle Theory Lecture 3

David Morrissey TRIUMF
March 20, 2013

PIRSA:13030067
High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 3

David Cory Institute for Quantum Computing (IQC)
March 20, 2013

PIRSA:13030056
Quantum Physics
Advanced General Relativity - Lecture 17

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 19, 2013

PIRSA:13030020
Evidence for a new particle on the worldsheet of the QCD flux tube

Sergei Dubovsky New York University (NYU)
March 19, 2013

PIRSA:13030109
High Energy Physics
We propose a new approach for the calculation of the spectrum of excitations of QCD flux tubes. It relies on the fact that the worldsheet theory is integrable at low energies. With this approach, energy levels can be calculated for much shorter flux tubes than was previously possible, allowing for a quantitative comparison with existing lattice data. The improved theoretical control makes it manifest that existing lattice data provides strong evidence for a new pseudoscalar particle localized on the QCD fluxtube - the worldsheet axion.
Learning what the Higgs is mixed with

Kunal Kumar Carleton University
March 19, 2013

PIRSA:13030089
High Energy Physics
The Standard Model Higgs boson may be mixed with another scalar that does not couple singly to gauge bosons or fermions. The electroweak quantum numbers of such an additional scalar can be determined by measuring the quartic Higgs-Higgs-vector-vector couplings, which contribute—along with the coveted triple Higgs coupling—to double Higgs production in e+e− collisions. We show that simultaneous sensitivity to the quartic Higgs-Higgs-vector-vector coupling and the triple Higgs coupling can be obtained using measurements of the double Higgs production cross section at two different e+e− center-of-mass energies. Kinematic distributions of the two Higgs bosons in the final state could provide additional discriminating power.
The Effective Field Theory of Large Scale Structures

Enrico Pajer Utrecht University
March 19, 2013

PIRSA:13030110
Astrophysics
An analytical understanding of large-scale matter inhomogeneities is an important cornerstone of our cosmological model and helps us interpreting current and future data. The standard approach, namely Eulerian perturbation theory, is unsatisfactory for at least three reasons: there is no clear expansion parameter since the density contrast is not small everywhere; it does not consistently account for deviations at large scales from a perfect pressureless fluid induced by short-scale non-linearities; for generic initial conditions, loop corrections are UV divergent, making predictions cutoff dependent and hence unphysical. I will present the systematic construction of an Effective Field Theory of Large Scale Structures and show that it successfully addresses all of the above issues. The idea is to smooth the density and velocity fields on a scale larger than the non-linear scale. The resulting smoothed fields are then small everywhere and provide a well-defined small parameter for perturbation theory. Smoothing amounts to integrating out the short scales, whose non-linear dynamics is hard to describe analytically. Their effects on the large scales are then determined by the symmetries of the problems. They introduce additional terms in the fluid equations such as an effective pressure, dissipation and stochastic noise. These terms have exactly the right scale dependence to cancel all divergences at one loop, and this should hold at all loops.
I will present a clean example of the renormalization of the theory in an Einstein de Sitter universe with self-similar initial conditions and discuss the relative importance of loop and effective corrections.
12/13 PSI - Explorations in Particle Theory Lecture 2

David Morrissey TRIUMF
March 19, 2013

PIRSA:13030066
High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 2

David Cory Institute for Quantum Computing (IQC)
March 19, 2013

PIRSA:13030055
Quantum Physics
12/13 PSI - Explorations in Particle Theory Lecture 1

David Morrissey TRIUMF
March 18, 2013

PIRSA:13030065
High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 1

David Cory Institute for Quantum Computing (IQC)
March 18, 2013

PIRSA:13030054
Quantum Physics
Advanced General Relativity - Lecture 16

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 14, 2013

PIRSA:13030015

Title	Date	Collection	Type	Info
Frustrated Magnets and Quantum Spin Liquids	2013‑03‑20	Colloquium	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 3	2013‑03‑20	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 3	2013‑03‑20	12/13 PSI - Explorations on Quantum Information	Course	View details
Advanced General Relativity - Lecture 17	2013‑03‑19	Elements of General Relativity	Course	View details
Evidence for a new particle on the worldsheet of the QCD flux tube	2013‑03‑19	Quantum Fields and Strings	Scientific Series	View details
Learning what the Higgs is mixed with	2013‑03‑19	Particle Physics	Scientific Series	View details
The Effective Field Theory of Large Scale Structures	2013‑03‑19	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 2	2013‑03‑19	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 2	2013‑03‑19	12/13 PSI - Explorations on Quantum Information	Course	View details
12/13 PSI - Explorations in Particle Theory Lecture 1	2013‑03‑18	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 1	2013‑03‑18	12/13 PSI - Explorations on Quantum Information	Course	View details
Advanced General Relativity - Lecture 16	2013‑03‑14	Elements of General Relativity	Course	View details

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Format results

Frustrated Magnets and Quantum Spin Liquids

12/13 PSI - Explorations in Particle Theory Lecture 3

12/13 PSI - Explorations on Quantum Information Lecture 3

Advanced General Relativity - Lecture 17

Evidence for a new particle on the worldsheet of the QCD flux tube

Learning what the Higgs is mixed with

The Effective Field Theory of Large Scale Structures

12/13 PSI - Explorations in Particle Theory Lecture 2

12/13 PSI - Explorations on Quantum Information Lecture 2

12/13 PSI - Explorations in Particle Theory Lecture 1

12/13 PSI - Explorations on Quantum Information Lecture 1

Advanced General Relativity - Lecture 16

Frustrated Magnets and Quantum Spin Liquids

12/13 PSI - Explorations in Particle Theory Lecture 3

12/13 PSI - Explorations on Quantum Information Lecture 3

Advanced General Relativity - Lecture 17

Evidence for a new particle on the worldsheet of the QCD flux tube

Learning what the Higgs is mixed with

The Effective Field Theory of Large Scale Structures

12/13 PSI - Explorations in Particle Theory Lecture 2

12/13 PSI - Explorations on Quantum Information Lecture 2

12/13 PSI - Explorations in Particle Theory Lecture 1

12/13 PSI - Explorations on Quantum Information Lecture 1

Advanced General Relativity - Lecture 16