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Spontaneous symmetry breaking, gravity, and spinning objects

Solomon Endlich Stanford University

May 29, 2014

PIRSA:14050111
Last gasp ‎of a black hole: why unitary evaporation must be non-monotonic

Matteo Smerlak Capital Fund Management S.A.
May 29, 2014

PIRSA:14050027
Quantum Gravity
Effective theories of vortex lines

Riccardo Penco University of Pennsylvania

May 29, 2014

PIRSA:14050103
Quantum matter without quasiparticles

Subir Sachdev Harvard University

May 29, 2014

PIRSA:14050109
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

Spontaneous symmetry breaking, gravity, and spinning objects

Solomon Endlich Stanford University

May 29, 2014

PIRSA:14050111

Space-time symmetries are a crucial ingredient of any theoretical model in physics. Unlike internal symmetries, which may or may not be gauged and/or spontaneously broken, space-time symmetries do not admit any ambiguity: they are gauged by gravity, and any conceivable physical system (other than the vacuum) is bound to break at least some of them. Motivated by this observation, I will sketch how to couple gravity with the Goldstone fields that non-linearly realize spontaneously broken space-time symmetries by weakly gauging the Poincare symmetry group in the context of the coset construction. To illustrate the power of this perspective I will build a low energy effective action that describes spinning objects coupled to gravity and describe its interpretation.
Last gasp ‎of a black hole: why unitary evaporation must be non-monotonic

Matteo Smerlak Capital Fund Management S.A.
May 29, 2014

PIRSA:14050027
Quantum Gravity
I will describe the relationship between radiated energy and entanglement entropy of massless fields at future null infinity (the "Page curve") in two-dimensional models of black hole evaporation. ‎I will use this connection to derive a general feature of any unitary-preserving evaporation scenario: the Bondi mass of the hole must be non-monotonic. Time permitting, I will comment on time scales in such scenarios.
Effective theories of vortex lines

Riccardo Penco University of Pennsylvania

May 29, 2014

PIRSA:14050103

Vortex lines are a distinctive feature of superfluids and are characterized by a very peculiar dynamics. In this talk, I will first discuss the behavior of vortex lines in a non-relativistic superfluids in the incompressible limit. I will then introduce an effective theory of vortex lines coupled to sound which applies to relativistic superfluids. I will conclude by briefly discussing the similarities between the effective theory for vortex lines and non-relativistic General Relativity.
Quantum matter without quasiparticles

Subir Sachdev Harvard University

May 29, 2014

PIRSA:14050109

Modern materials abound in systems to which the quasiparticle picture does not apply, and developing their theoretical description remains an important challenge in condensed matter physics. I will describe recent progress in understanding the dynamics of two systems without quasiparticles: (i) ultracold atoms in optical lattices, and (ii) the nematic quantum critical point of metals with applications to the `strange metal’ found in the high temperature superconductors. A combination of field-theoretic, holographic, and numerical methods will be used.
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.

Title	Date	Collection	Type	Info
Spontaneous symmetry breaking, gravity, and spinning objects	2014‑05‑29	Low Energy Challenges for High Energy Physicists	Conference	View details
Last gasp ‎of a black hole: why unitary evaporation must be non-monotonic	2014‑05‑29	Quantum Gravity	Scientific Series	View details
Effective theories of vortex lines	2014‑05‑29	Low Energy Challenges for High Energy Physicists	Conference	View details
Quantum matter without quasiparticles	2014‑05‑29	Low Energy Challenges for High Energy Physicists	Conference	View details
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

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