Conference

Displaying 2689 - 2700 of 4979

What's wrong with Goldstone?

Hitoshi Murayama University of Tokyo

May 28, 2014

PIRSA:14050106
Quantum Turbulence
- Russell Donnelly
- Carlo Barenghi Newcastle University
May 28, 2014

PIRSA:14050104
From scale invariance to Lorentz symmetry

Sergey Sibiryakov McMaster University

May 28, 2014

PIRSA:14050136
Some Exact Results for Conformal Field Theories in d>2

Zohar Komargodski Stony Brook University

May 27, 2014

PIRSA:14050137
Universal incoherent metallic transport

Sean Hartnoll Stanford University

May 27, 2014

PIRSA:14050102
Effective field theory of two-dimensional nonrelativistic chiral superfluid

Sergej Moroz University of Washington

May 27, 2014

PIRSA:14050101
Visualizing Quantum Matter

May 27, 2014

PIRSA:14050100
Quantum Magnetic Phenomena: From QCD to Dirac semimetals

Igor Shovkovy Western Illinois University

May 26, 2014

PIRSA:14050099
Einstein's equations from qubits

Brian Swingle Brandeis University

May 26, 2014

PIRSA:14050098
Sudakov Form Factor and Von-Hove Singularities

Ira Rothstein Carnegie Mellon University

May 26, 2014

PIRSA:14050096
Wilsonian and Large N Approaches to Non-Fermi Liquids

Liam Fitzpatrick Boston University

May 26, 2014

PIRSA:14050095
Cosmological Dynamics of Space As a Quantum Gravity Condensate

Steffen Gielen University of Sheffield

May 22, 2014

PIRSA:14050135

What's wrong with Goldstone?

Hitoshi Murayama University of Tokyo

May 28, 2014

PIRSA:14050106

Spontaneous Symmetry Breaking is a very universal concept applicable for a wide range of subjects: crystal, superfluid, neutron stars, Higgs boson, magnets, and many others. Yet there is a variety in the spectrum of gapless excitations even when the symmetry breaking patterns are the same. We unified all known examples in a single-line Lagrangian of the low-energy effective theory.
Quantum Turbulence
- Russell Donnelly
- Carlo Barenghi Newcastle University
May 28, 2014

PIRSA:14050104

This hour will be devoted to a description of quantum turbulence,that is turbulence in superfluids. The first talk (~20 minutes) will be given by Russell Donnelly. He will describe briefly the problem of classical turbulence and how turbulence in superfluids is different. The second talk will be given by Carlo Barenghi who will discuss progress in the simulation of quantum turbulence which is capable of suggesting insights so far inaccessible to experiment.
From scale invariance to Lorentz symmetry

Sergey Sibiryakov McMaster University

May 28, 2014

PIRSA:14050136

I will discuss the enhancement of space-time symmetries to Lorentz (rotation) invariance at the renormalization group fixed points of non-relativistic (anisotropic) field theories. Upon describing examples from the condensed matter physics, I will review the general argument for the stability of the infrared fixed points with the enhanced symmetry. Then I will focus on unitary field theories in (1+1) space-time dimensions which are invariant under translations, isotropic scale transformations and satisfy the requirement that the velocity of signal propagation is bounded from above. No a priori Lorentz invariance will be assumed. Still, I will prove that above properties are sufficient to ensure the existence of an infinite dimensional symmetry given by one or a product of several copies of conformal algebra. In particular, this implies presence of one or several Lorentz groups acting on the operator algebra of the theory. I will conclude by discussing the challenges in extending this result to higher space-time dimensions.
Some Exact Results for Conformal Field Theories in d>2

Zohar Komargodski Stony Brook University

May 27, 2014

PIRSA:14050137
Universal incoherent metallic transport

Sean Hartnoll Stanford University

May 27, 2014

PIRSA:14050102

In an incoherent metal, transport is controlled by the collective diffusion of energy and charge rather than by quasiparticle or momentum relaxation. We explore the possibility of a universal bound D \gtrsim \hbar v_F^2 /(k_B T) on the underlying diffusion constants in an incoherent metal. Such a bound is loosely motivated by results from holographic duality, the uncertainty principle and from measurements of diffusion in strongly interacting non-metallic systems. Metals close to saturating this bound are shown to have a linear in temperature resistivity with an underlying dissipative timescale matching that recently deduced from experimental data on a wide range of metals. The phenomenology of universal incoherent transport is found to reproduce various further observations in strongly correlated metals, and motivates direct probes of diffusive processes and measurements of charge susceptibilities. We suggest that this bound may be responsible for the ubiquitous appearance of high temperature regimes in metals with T-linear resistivity.
Effective field theory of two-dimensional nonrelativistic chiral superfluid

Sergej Moroz University of Washington

May 27, 2014

PIRSA:14050101

Due to the current search of Majorana fermions, the physics of two-dimensional identical fermions with short-range p-wave interactions is of considerable interest. My talk will be about the effective theory of a chiral p+ip fermionic superfluid at zero temperature. This theory naturally incorporates the parity and time reversal violating effects such as the Hall viscosity and the edge current. I will present some applications of this theory such as the linear response to external electromagnetic and gravitational fields and the density profile of an isolated vortex. Finally, the dual gauge reformulation of this theory will be presented.
Visualizing Quantum Matter

May 27, 2014

PIRSA:14050100

Recently developed techniques allow imaging of electronic quantum matter directly at the atomic scale. I will introduce the basic principles and describe the set of observables available from these techniques. As examples, I will survey visualization of exotic forms of electronic quantum matter including heavy fermions, quantum critical electrons, topological surface states, electronic liquid crystals, and high temperature superconductors.
Quantum Magnetic Phenomena: From QCD to Dirac semimetals

Igor Shovkovy Western Illinois University

May 26, 2014

PIRSA:14050099

Studies of relativistic matter in strong magnetic fields attracted a lot of attention in recent years. Such studies are primarily motivated by the phenomenology of compact stars, the evolution of the Early Universe, and the physics of relativistic heavy ion collisions. Additionally, the outcomes of such research result in deeper understanding of a large class of novel condensed matter materials (e.g., graphene and Dirac semimetals. I will review recent surprises, ideas, and the progress made in understanding physical properties of relativistic matter in strong magnetic fields.
Einstein's equations from qubits

Brian Swingle Brandeis University

May 26, 2014

PIRSA:14050098

I will outline a path by which a semi-classical geometry obeying Einstein's equations emerges holographically from elementary quantum mechanical objects undergoing local dynamics. The key idea is that entanglement between the quantum degrees of freedom leads to the emergence of a dynamical geometry, that entanglement is the fabric of spacetime. Furthermore, although important technical challenges remain, I will argue that the conceptual ideas are in place. The core of the talk will be two new results that are crucial to this program, one establishing a new representation of entanglement in RG tensor networks and the other showing that the equivalence principle is encoded in the universality of entanglement.
Sudakov Form Factor and Von-Hove Singularities

Ira Rothstein Carnegie Mellon University

May 26, 2014

PIRSA:14050096

In this talk I will discuss the analogies between high energy scattering of nucleons and Fermi Liquid theory. In particular I will elucidate the relation between the rapidity renormalization group utilized in such observables as transverse momentum distribution and the effect of Von-Hove singularities on the low energy properties of metals.
Wilsonian and Large N Approaches to Non-Fermi Liquids

Liam Fitzpatrick Boston University

May 26, 2014

PIRSA:14050095

We study the problem of metals near a quantum critical point using a local Wilsonian effective field theory of Fermi surface fermions coupled to massless boson (i.e. order parameter) fields, in particular in a large N limit where the boson is matrix-valued. We focus on regions of parameter space where the boson dresses the fermions into a non-Fermi liquid while the bosons are approximately controlled by the Wilson-Fisher fixed point.
Cosmological Dynamics of Space As a Quantum Gravity Condensate

Steffen Gielen University of Sheffield

May 22, 2014

PIRSA:14050135

Title	Speaker(s)	Date	Talk Type	Info link
What's wrong with Goldstone?	Hitoshi Murayama	2014-05-28	Conference	View details
Quantum Turbulence	Russell Donnelly, Carlo Barenghi	2014-05-28	Conference	View details
From scale invariance to Lorentz symmetry	Sergey Sibiryakov	2014-05-28	Conference	View details
Some Exact Results for Conformal Field Theories in d>2	Zohar Komargodski	2014-05-27	Conference	View details
Universal incoherent metallic transport	Sean Hartnoll	2014-05-27	Conference	View details
Effective field theory of two-dimensional nonrelativistic chiral superfluid	Sergej Moroz	2014-05-27	Conference	View details
Visualizing Quantum Matter		2014-05-27	Conference	View details
Quantum Magnetic Phenomena: From QCD to Dirac semimetals	Igor Shovkovy	2014-05-26	Conference	View details
Einstein's equations from qubits	Brian Swingle	2014-05-26	Conference	View details
Sudakov Form Factor and Von-Hove Singularities	Ira Rothstein	2014-05-26	Conference	View details
Wilsonian and Large N Approaches to Non-Fermi Liquids	Liam Fitzpatrick	2014-05-26	Conference	View details
Cosmological Dynamics of Space As a Quantum Gravity Condensate	Steffen Gielen	2014-05-22	Conference	View details

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