Talks

11389 - 11400 of 19958 Results

Some Conceptual Problems in General Relativity and Cosmology

Jayant Narlikar IUCAA - The Inter-University Centre for Astronomy and Astrophysics

June 03, 2014

PIRSA:14060004

Astrophysics
Dynamical trapping near a quantum critical point

Emanuel Katz Boston University

May 30, 2014

PIRSA:14050116
Functional renormalization group and statistical mechanics of membranes

Omar Zanusso SISSA Scuola Internazionale Superiore di Studi Avanzati

May 30, 2014

PIRSA:14050115
Relativity of non relativistic systems

Federico Piazza Aix-Marseille University

May 30, 2014

PIRSA:14050113
Lattice models for anomalous field theories

John McGreevy University of California, San Diego

May 29, 2014

PIRSA:14050110
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

General Relativity & Quantum Cosmology
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

Some Conceptual Problems in General Relativity and Cosmology

Jayant Narlikar IUCAA - The Inter-University Centre for Astronomy and Astrophysics

June 03, 2014

PIRSA:14060004

Astrophysics

This talk will try to highlight some basic problems connected with conclusions uncritically drawn from well known works. These include: 1. The Schwarzschild solution 2. The formation of black holes by gravitational collapse 3. The no hair theorem 4. The principle of equivalence in the very early universe.
Dynamical trapping near a quantum critical point

Emanuel Katz Boston University

May 30, 2014

PIRSA:14050116

We consider a closed system where the parameter controlling a quantum phase transition is promoted to a dynamical field interacting with the quantum critical theory. In the case that the field has an energy extensive in the volume we can treat its evolution classically. We find that the field can become trapped near the phase transition point due to its interactions with the degrees of freedom of the quantum critical theory. The trapping/untrapping transition can be understood using Kibble-Zurek scaling arguments. We check the general framework numerically in the particular case of the 1D transverse field Ising chain, where the transverse magnetic field is dynamical. This constitutes a dynamical mechanism for tuning a relevant parameter to zero through a non-equilibrium process.
Functional renormalization group and statistical mechanics of membranes

Omar Zanusso SISSA Scuola Internazionale Superiore di Studi Avanzati

May 30, 2014

PIRSA:14050115

We will first review the rich variety of universality classes of membranes and the various models developed to describe their mechanical properties. We will then discuss the recent applications of the non-perturbative renormalization group to these models aimed at improving the understanding of the membranes' phase-space beyond the epsilon-expansion. Finally, we will comment on the implications of these results on various physical systems.
Relativity of non relativistic systems

Federico Piazza Aix-Marseille University

May 30, 2014

PIRSA:14050113

To the best of our knowledge, the fundamental laws of physics are Lorentz invariant. This means that condensed matter systems at finite density still display full Lorentz symmetry: it is just spontaneously broken (i.e. by state considered) and thus non-linearly realized. This simple observation allows to derive exact results about the spectrum of theories at finite charge density and suggests to classify condensed matter systems according to all the inequivalent ways in which boosts can be spontaneously broken.
Lattice models for anomalous field theories

John McGreevy University of California, San Diego

May 29, 2014

PIRSA:14050110
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

General Relativity & Quantum Cosmology

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.

Title	Date	Collection	Type	Info
Some Conceptual Problems in General Relativity and Cosmology	2014‑06‑03	Cosmology and Gravitation	Scientific Series	View details
Dynamical trapping near a quantum critical point	2014‑05‑30	Low Energy Challenges for High Energy Physicists	Conference	View details
Functional renormalization group and statistical mechanics of membranes	2014‑05‑30	Low Energy Challenges for High Energy Physicists	Conference	View details
Relativity of non relativistic systems	2014‑05‑30	Low Energy Challenges for High Energy Physicists	Conference	View details
Lattice models for anomalous field theories	2014‑05‑29	Low Energy Challenges for High Energy Physicists	Conference	View details
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

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Some Conceptual Problems in General Relativity and Cosmology

Dynamical trapping near a quantum critical point

Functional renormalization group and statistical mechanics of membranes

Relativity of non relativistic systems

Lattice models for anomalous field theories

Spontaneous symmetry breaking, gravity, and spinning objects

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

Effective theories of vortex lines

Quantum matter without quasiparticles

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

Hydrodynamics and anomalies

What's wrong with Goldstone?

Some Conceptual Problems in General Relativity and Cosmology

Dynamical trapping near a quantum critical point

Functional renormalization group and statistical mechanics of membranes

Relativity of non relativistic systems

Lattice models for anomalous field theories

Spontaneous symmetry breaking, gravity, and spinning objects

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

Effective theories of vortex lines

Quantum matter without quasiparticles

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

Hydrodynamics and anomalies

What's wrong with Goldstone?