Talks

10417 - 10428 of 16890 Results

The effective field theory of general relativity, running couplings and Asymptotic Safety

John Donoghue University of Massachusetts Amherst

May 09, 2013

PIRSA:13050003

Quantum Gravity
Emergence and Entanglement in Matrix Product States

Frank Verstraete Ghent University

May 09, 2013

PIRSA:13050043

Quantum Information
David Defeats Goliath: How Ultralight Fields Affect The Dynamics of Massive Black Holes

Paolo Pani Instituto Superior Tecnico - Departamento de Física

May 09, 2013

PIRSA:13050001

Strong Gravity
Characterizing topological order form a microscopic lattice Hamiltonian

Lukasz Cincio Los Alamos National Laboratory

May 09, 2013

PIRSA:13050042

Quantum Information

Condensed Matter
Directed Influence in the RG Flow

Glen Evenbly Georgia Institute of Technology

May 09, 2013

PIRSA:13050041

Quantum Fields and Strings
Quantum Spin Liquids,Density Matrix Renormalization Group, and Entanglement

Leon Balents University of California, Santa Barbara

May 09, 2013

PIRSA:13050040

Condensed Matter
Searching for Spin Liquids

Steven White University of California, Irvine

May 09, 2013

PIRSA:13050039

Quantum Fields and Strings

Condensed Matter
Entangled states of quantum matter

Subir Sachdev Harvard University

May 08, 2013

PIRSA:13050038

Condensed Matter
Holographic insights into quantum critical transport: from branes to Bose-Hubbard

May 08, 2013

PIRSA:13050037

Condensed Matter
Quantum renormalization group and AdS/CFT

Sung-Sik Lee McMaster University

May 08, 2013

PIRSA:13050036

Quantum Fields and Strings
Propagation of entanglement in strongly coupled systems from gravity

Hong Liu Massachusetts Institute of Technology (MIT) - Department of Physics

May 08, 2013

PIRSA:13050035

Quantum Gravity
Thermodynamical Property of Entanglement Entropy for Excited States

Tadashi Takayanagi Yukawa Institute for Theoretical Physics

May 08, 2013

PIRSA:13050034

Condensed Matter

The effective field theory of general relativity, running couplings and Asymptotic Safety

John Donoghue University of Massachusetts Amherst

May 09, 2013

PIRSA:13050003

Quantum Gravity

Effective field theory techniques allow reliable quantum calculations in general relativity at low energy. After a review of these techniques, I will discuss the attempts to define the gravitational corrections to running gauge couplings and to the couplings of gravity itself. I will also describe an attempt to understand the relation between the effective field theory and Asymptotic Safety in the region where they overlap.
Emergence and Entanglement in Matrix Product States

Frank Verstraete Ghent University

May 09, 2013

PIRSA:13050043

Quantum Information
David Defeats Goliath: How Ultralight Fields Affect The Dynamics of Massive Black Holes

Paolo Pani Instituto Superior Tecnico - Departamento de Física

May 09, 2013

PIRSA:13050001

Strong Gravity

In the last few years several interesting phenomena associated to the interaction between massive black holes and fundamental bosonic fields have been discovered. I present a selection of them, including superradiance instabilities of spin-0, spin-1 and spin-2 fields, floating orbits in extreme-mass ratio inspirals and black-hole spontaneous scalarization. The theoretical potential of these effects
as almost-model-independent smoking guns for exotic particles and modified gravity, as well as their limitations in realistic astrophysical scenarios, are discussed.
Characterizing topological order form a microscopic lattice Hamiltonian

Lukasz Cincio Los Alamos National Laboratory

May 09, 2013

PIRSA:13050042

Quantum Information

Condensed Matter

In this talk I will show how to obtain a detailed characterization of the emergent topological order starting from microscopic Hamiltonian on a two dimensional lattice. A key step is to obtain a tensor network representation for a complete set of ground states of the Hamiltonian, ﬁrst on an inﬁnite cylinder and then on a ﬁnite torus. As an application of the method I will study lattice Hamiltonians that give rise to selected anyon models, namely chiral semion, Ising as well as Z_3 and Z_5 models.
Directed Influence in the RG Flow

Glen Evenbly Georgia Institute of Technology

May 09, 2013

PIRSA:13050041

Quantum Fields and Strings

Given two lattice Hamiltonians H_1 and H_2 that are identical everywhere except on a local region R of the lattice, we propose a relationship between their ground states psi_1 and psi_2. Specifically, assuming the states can be represented as multi-scale entanglement renormalization ansatz (MERA), we propose a principle of directed influence which asserts that the tensors in the MERA’s that represent the ground states can be chosen to be identical everywhere except within a specific, localized region of the tensor network. The validity of this principle is justified by demonstrating it to follow from Wilson's renormalization ideas towards systems with manifestly separated energy scales. This result is shown, through numerical examples, to have practical applications towards the efficient simulation of systems with impurities, boundaries and interfaces, and also argued to provide useful insights towards holographic representations of quantum states.
Quantum Spin Liquids,Density Matrix Renormalization Group, and Entanglement

Leon Balents University of California, Santa Barbara

May 09, 2013

PIRSA:13050040

Condensed Matter

I will review recent work in our group using Density Matrix Renormalization Group (DMRG) to search for and study quantum spin liquid and topologically ordered states in two dimensional model Hamiltonians. This proves an efficient way to study these phases in semi-realistic situations. I will try to draw lessons from several studies and theoretical considerations.
Searching for Spin Liquids

Steven White University of California, Irvine

May 09, 2013

PIRSA:13050039

Quantum Fields and Strings

Condensed Matter
Entangled states of quantum matter

Subir Sachdev Harvard University

May 08, 2013

PIRSA:13050038

Condensed Matter

Theorists have been studying and classifying entanglement in many-particle quantum states for many years. In the past few years, experiments on such states have finally appeared, generating much excitement. I will describe experimental observations on magnetic insulators, ultracold atoms, and high temperature superconductors, and their invigorating influence on our theoretical understanding.
Holographic insights into quantum critical transport: from branes to Bose-Hubbard

May 08, 2013

PIRSA:13050037

Condensed Matter

We discuss the general features of charge transport of quantum critical points described by CFTs in 2+1D. Our main tool is the AdS/CFT correspondence, but we will make connections to standard field theory results and to recent quantum Monte Carlo data. We emphasize the importance of poles and zeros of the response functions. In the holographic setting, these are the discrete quasinormal modes of a black hole/brane; they map to the excitations of the CFT. We further describe the role of particle-vortex or S-duality on the conductivity, which is argued to obey two powerful sum rules.
References (with S. Sachdev): arXiv:1210.4166 (PRB 12); arXiv:1302.0847 (PRB 13)
Quantum renormalization group and AdS/CFT

Sung-Sik Lee McMaster University

May 08, 2013

PIRSA:13050036

Quantum Fields and Strings

In this talk, I will discuss about the notion of quantum renormalization group, and explain how (D+1)-dimensional gravitational theories naturally emerge as dual descriptions for D-dimensional quantum field theories. It will be argued that the dynamical gravitational field in the bulk encodes the entanglement between low energy modes and high energy modes of the corresponding quantum field theory.
Propagation of entanglement in strongly coupled systems from gravity

Hong Liu Massachusetts Institute of Technology (MIT) - Department of Physics

May 08, 2013

PIRSA:13050035

Quantum Gravity
Thermodynamical Property of Entanglement Entropy for Excited States

Tadashi Takayanagi Yukawa Institute for Theoretical Physics

May 08, 2013

PIRSA:13050034

Condensed Matter

We will point out that there is a universal thermodynamical property of entanglement entropy for excited states. We will derive this by using the AdS/CFT correspondence in any dimension. We will also directly confirm this property from direct field theoretic calculations in two dimensions. We will define a new quantity called entanglement density by taking derivatives of entanglement entropy with respect to the shape of subsystem. We will show that this quantity coincides with the energy density by taking the small subsystem limit and show that this is another equivalent statement of the thermodynamical property.

Title	Date	Collection	Type	Info
The effective field theory of general relativity, running couplings and Asymptotic Safety	2013‑05‑09	Quantum Gravity	Scientific Series	View details
Emergence and Entanglement in Matrix Product States	2013‑05‑09	Emergence & Entanglement II 2013	Conference	View details
David Defeats Goliath: How Ultralight Fields Affect The Dynamics of Massive Black Holes	2013‑05‑09	Strong Gravity	Scientific Series	View details
Characterizing topological order form a microscopic lattice Hamiltonian	2013‑05‑09	Emergence & Entanglement II 2013	Conference	View details
Directed Influence in the RG Flow	2013‑05‑09	Emergence & Entanglement II 2013	Conference	View details
Quantum Spin Liquids,Density Matrix Renormalization Group, and Entanglement	2013‑05‑09	Emergence & Entanglement II 2013	Conference	View details
Searching for Spin Liquids	2013‑05‑09	Emergence & Entanglement II 2013	Conference	View details
Entangled states of quantum matter	2013‑05‑08	Colloquium	Scientific Series	View details
Holographic insights into quantum critical transport: from branes to Bose-Hubbard	2013‑05‑08	Emergence & Entanglement II 2013	Conference	View details
Quantum renormalization group and AdS/CFT	2013‑05‑08	Emergence & Entanglement II 2013	Conference	View details
Propagation of entanglement in strongly coupled systems from gravity	2013‑05‑08	Emergence & Entanglement II 2013	Conference	View details
Thermodynamical Property of Entanglement Entropy for Excited States	2013‑05‑08	Emergence & Entanglement II 2013	Conference	View details

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