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

John Donoghue University of Massachusetts Amherst
May 09, 2013

PIRSA:13050003
General Relativity & Quantum Cosmology
Emergence and Entanglement in Matrix Product States

Frank Verstraete Ghent University
May 09, 2013

PIRSA:13050043
Quantum Physics
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
General Relativity & Quantum Cosmology
Characterizing topological order form a microscopic lattice Hamiltonian

Lukasz Cincio Los Alamos National Laboratory
May 09, 2013

PIRSA:13050042
Quantum Physics

Condensed Matter
Directed Influence in the RG Flow

Glen Evenbly Georgia Institute of Technology
May 09, 2013

PIRSA:13050041
High Energy Physics
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
High Energy Physics

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
High Energy Physics
Propagation of entanglement in strongly coupled systems from gravity

Hong Liu Massachusetts Institute of Technology (MIT) - Department of Physics
May 08, 2013

PIRSA:13050035
General Relativity & Quantum Cosmology
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
General Relativity & Quantum Cosmology
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 Physics
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
General Relativity & Quantum Cosmology
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 Physics

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
High Energy Physics
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
High Energy Physics

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
High Energy Physics
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
General Relativity & Quantum Cosmology
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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The effective field theory of general relativity, running couplings and Asymptotic Safety

Emergence and Entanglement in Matrix Product States

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

Characterizing topological order form a microscopic lattice Hamiltonian

Directed Influence in the RG Flow

Quantum Spin Liquids,Density Matrix Renormalization Group, and Entanglement

Searching for Spin Liquids

Entangled states of quantum matter

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

Quantum renormalization group and AdS/CFT

Propagation of entanglement in strongly coupled systems from gravity

Thermodynamical Property of Entanglement Entropy for Excited States

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

Emergence and Entanglement in Matrix Product States

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

Characterizing topological order form a microscopic lattice Hamiltonian

Directed Influence in the RG Flow

Quantum Spin Liquids,Density Matrix Renormalization Group, and Entanglement

Searching for Spin Liquids

Entangled states of quantum matter

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

Quantum renormalization group and AdS/CFT

Propagation of entanglement in strongly coupled systems from gravity

Thermodynamical Property of Entanglement Entropy for Excited States