Talks

9241 - 9252 of 16765 Results

Informal Talk on geometry of tensor networks (MERA) and AdS/CFT

Brian Swingle Brandeis University

May 28, 2014

PIRSA:14050150
Hydrodynamics and anomalies

Dam Thanh Son University of Chicago

May 28, 2014

PIRSA:14050107
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
Phenomenology of charge order in underdoped cuprates

Andrea Allais Harvard University

May 27, 2014

PIRSA:14050147
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

Informal Talk on geometry of tensor networks (MERA) and AdS/CFT

Brian Swingle Brandeis University

May 28, 2014

PIRSA:14050150

Brian Swingle obtained his PhD from MIT in 2011 and then moved to Harvard, where he is currently a Simons Fellow in condensed matter physics. Swingle is interested in the physics of quantum matter, and especially in the interface between condensed matter physics, quantum information science, and gravity and holography.
Hydrodynamics and anomalies

Dam Thanh Son University of Chicago

May 28, 2014

PIRSA:14050107

Recently its has been found that relativistic hydrodynamics requires modifications in the presence of quantum anomalies. We will follow the theoretical developments that leads to this discovery and look at modern applications of hydrodynamics with anomalies.
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
Phenomenology of charge order in underdoped cuprates

Andrea Allais Harvard University

May 27, 2014

PIRSA:14050147

In the past few years substantial evidence has been collected that points to coexistence of charge correlations with long range superconductivity in underdoped cuprate superconductors. In this talk I will review some of this evidence, then show that a charge density wave with precisely the same signatures is a natural instability of an antiferromagnetic metal, and finally derive some phenomenological consequences, with special focus on quantum oscillation experiments.
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.

Title	Date	Collection	Type	Info
Informal Talk on geometry of tensor networks (MERA) and AdS/CFT	2014‑05‑28		Other	View details
Hydrodynamics and anomalies	2014‑05‑28	Low Energy Challenges for High Energy Physicists	Conference	View details
What's wrong with Goldstone?	2014‑05‑28	Low Energy Challenges for High Energy Physicists	Conference	View details
Quantum Turbulence	2014‑05‑28	Low Energy Challenges for High Energy Physicists	Conference	View details
From scale invariance to Lorentz symmetry	2014‑05‑28	Low Energy Challenges for High Energy Physicists	Conference	View details
Some Exact Results for Conformal Field Theories in d>2	2014‑05‑27	Low Energy Challenges for High Energy Physicists	Conference	View details
Phenomenology of charge order in underdoped cuprates	2014‑05‑27	Quantum Matter	Scientific Series	View details
Universal incoherent metallic transport	2014‑05‑27	Low Energy Challenges for High Energy Physicists	Conference	View details
Effective field theory of two-dimensional nonrelativistic chiral superfluid	2014‑05‑27	Low Energy Challenges for High Energy Physicists	Conference	View details
Visualizing Quantum Matter	2014‑05‑27	Low Energy Challenges for High Energy Physicists	Conference	View details
Quantum Magnetic Phenomena: From QCD to Dirac semimetals	2014‑05‑26	Low Energy Challenges for High Energy Physicists	Conference	View details
Einstein's equations from qubits	2014‑05‑26	Low Energy Challenges for High Energy Physicists	Conference	View details

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