Talks

10465 - 10476 of 19186 Results

Self-assembling tensor networks and holography in disordered spin chains

Andrew Goldsborough RWTH Aachen University

September 16, 2014

PIRSA:14090029

Condensed Matter
Infinite Chiral Symmetry in Four Dimensions

Wolfger Peelaers University of Oxford

September 16, 2014

PIRSA:14090079
Scalar Simplified Models and Dark Matter at Colliders

Matthew Buckley Rutgers University

September 16, 2014

PIRSA:14090080

High Energy Physics
Cosmic flows: testing gravity and the matter power spectrum on very large scales

Mike Hudson University of Waterloo

September 16, 2014

PIRSA:14090077

Astrophysics
14/15 PSI Quantum Theory-7

Joseph Emerson Institute for Quantum Computing (IQC)

September 16, 2014

PIRSA:14090050
14/15 PSI - Relativity- Lecture 7

Neil Turok University of Edinburgh

September 16, 2014

PIRSA:14090017
14/15 PSI Quantum Theory-6

Joseph Emerson Institute for Quantum Computing (IQC)

September 15, 2014

PIRSA:14090049
14/15 PSI - Relativity- Lecture 6

Neil Turok University of Edinburgh

September 15, 2014

PIRSA:14090016
Maximal supergravity, holography and the Romans mass

Oscar Varela Harvard University

September 12, 2014

PIRSA:14090071

High Energy Physics
14/15 PSI Quantum Theory-5

Joseph Emerson Institute for Quantum Computing (IQC)

September 12, 2014

PIRSA:14090046
14/15 PSI - Relativity- Lecture 5

Neil Turok University of Edinburgh

September 12, 2014

PIRSA:14090011
Stripes and pairing in t-J and Hubbard models

Steven White University of California, Irvine

September 11, 2014

PIRSA:14090074

Condensed Matter

Self-assembling tensor networks and holography in disordered spin chains

Andrew Goldsborough RWTH Aachen University

September 16, 2014

PIRSA:14090029

Condensed Matter

We show that the numerical strong disorder renormalization group algorithm (SDRG) of Hikihara et.\ al.\ [{Phys. Rev. B} {\bf 60}, 12116 (1999)] for the one-dimensional disordered Heisenberg model naturally describes a tree tensor network (TTN) with an irregular structure defined by the strength of the couplings. Employing the holographic interpretation of the TTN in Hilbert space, we compute expectation values, correlation functions and the entanglement entropy using the geometrical properties of the TTN. We find that the disorder averaged spin-spin correlation scales with the average path length through the tensor network while the entanglement entropy scales with the minimal surface connecting two regions. Furthermore, the entanglement entropy increases with both disorder and system size, resulting in an area-law violation. Our results demonstrate the usefulness of a self-assembling TTN approach to disordered systems and quantitatively validate the connection between holography and quantum many-body systems.
Infinite Chiral Symmetry in Four Dimensions

Wolfger Peelaers University of Oxford

September 16, 2014

PIRSA:14090079

We describe a new correspondence between four-dimensional conformal field theories with extended supersymmetry and two-dimensional chiral algebras. We explore the resulting chiral algebras in the context of theories of class S. The class S duality web implies nontrivial associativity properties for the corresponding chiral algebras, the structure of which can be summarized by a generalized topological quantum field theory.
Scalar Simplified Models and Dark Matter at Colliders

Matthew Buckley Rutgers University

September 16, 2014

PIRSA:14090080

High Energy Physics

Dark matter is clear evidence of the existence of new physics beyond the Standard Model, and there are compelling reasons to expect that this physics can be probed at the LHC. As we prepare for Run II, we must consider a wide range of possible phenomenology, leaving no stone unturned. In this talk, I present a set of scalar and pseudoscalar models which provide a useful framework to interpret dark matter results, and can motivate new searches in novel channels at the LHC.
Cosmic flows: testing gravity and the matter power spectrum on very large scales

Mike Hudson University of Waterloo

September 16, 2014

PIRSA:14090077

Astrophysics

Peculiar velocities - deviations from Hubble expansion - are the only practical probe of the growth of matter density fluctuations on very large scales in the nearby Universe. I will discuss recent measurements of quantities of cosmological interest from our group and others. One is the "bulk" flow of nearby galaxies with respect to the frame defined by the Cosmic Microwave Background, and what this tells us about fluctuations on large very spatial scales. The second is the measurement of the growth rate of fluctuations, a critical test of Lambda CDM and modified gravity models.
14/15 PSI Quantum Theory-7

Joseph Emerson Institute for Quantum Computing (IQC)

September 16, 2014

PIRSA:14090050
14/15 PSI - Relativity- Lecture 7

Neil Turok University of Edinburgh

September 16, 2014

PIRSA:14090017
14/15 PSI Quantum Theory-6

Joseph Emerson Institute for Quantum Computing (IQC)

September 15, 2014

PIRSA:14090049
14/15 PSI - Relativity- Lecture 6

Neil Turok University of Edinburgh

September 15, 2014

PIRSA:14090016
Maximal supergravity, holography and the Romans mass

Oscar Varela Harvard University

September 12, 2014

PIRSA:14090071

High Energy Physics

At large N, an important sector of the ABJM field theory defined on a stack of N M2-branes can be described holographically by the D=4 N=8 SO(8)-gauged supergravity of de Wit and Nicolai. Since its inception, the latter has been tacitly assumed to be unique. Recently, however, a one-parameter family of SO(8) gaugings of N=8 supergravity has been discovered, the de Wit-Nicolai theory being just a member in this class. I will explain how this overlooked family of SO(8)-gauged supergravities is deeply related to electric/magnetic duality breaking in four dimensions. I will then discuss some predictions that can be made about the family of dual large-N field theories that these supergravities define, focusing on the structure of superconformal phases and the RG flows between them. I will finally argue that when the gauging is chosen to be related, but different, to the SO(8) one, the D=4 N=8 family arises as consistent truncation of massive IIA on the six-sphere, with the Romans mass identified as the electric/magnetic duality-breaking parameter.
14/15 PSI Quantum Theory-5

Joseph Emerson Institute for Quantum Computing (IQC)

September 12, 2014

PIRSA:14090046
14/15 PSI - Relativity- Lecture 5

Neil Turok University of Edinburgh

September 12, 2014

PIRSA:14090011
Stripes and pairing in t-J and Hubbard models

Steven White University of California, Irvine

September 11, 2014

PIRSA:14090074

Condensed Matter

This has been a leading question in condensed matter physics since the discovery of the cuprate superconductors. In this talk I will review some of the DMRG and tensor network results for the ground states of these models. A key question I'll address is the issue of stripes: are the ground states striped? Do stripes compete with or induce d-wave superconductivity? Another question I'll address is: how well does 2D DMRG do in comparison with iPEPS and quantum Monte Carlo. I will also show recent results for a standard 3-band Hubbard model for the cuprates. The asymmetry between hole and electron doped systems which is seen in the cuprates arises naturally from this model.

Title	Date	Collection	Type	Info
Self-assembling tensor networks and holography in disordered spin chains	2014‑09‑16	Quantum Matter	Scientific Series	View details
Infinite Chiral Symmetry in Four Dimensions	2014‑09‑16	Quantum Fields and Strings	Scientific Series	View details
Scalar Simplified Models and Dark Matter at Colliders	2014‑09‑16	Particle Physics	Scientific Series	View details
Cosmic flows: testing gravity and the matter power spectrum on very large scales	2014‑09‑16	Cosmology and Gravitation	Scientific Series	View details
14/15 PSI Quantum Theory-7	2014‑09‑16	14/15 PSI - Quantum Theory	Course	View details
14/15 PSI - Relativity- Lecture 7	2014‑09‑16	14/15 PSI -Relativity	Course	View details
14/15 PSI Quantum Theory-6	2014‑09‑15	14/15 PSI - Quantum Theory	Course	View details
14/15 PSI - Relativity- Lecture 6	2014‑09‑15	14/15 PSI -Relativity	Course	View details
Maximal supergravity, holography and the Romans mass	2014‑09‑12	Quantum Fields and Strings	Scientific Series	View details
14/15 PSI Quantum Theory-5	2014‑09‑12	14/15 PSI - Quantum Theory	Course	View details
14/15 PSI - Relativity- Lecture 5	2014‑09‑12	14/15 PSI -Relativity	Course	View details
Stripes and pairing in t-J and Hubbard models	2014‑09‑11	Quantum Matter	Scientific Series	View details

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Format results

Self-assembling tensor networks and holography in disordered spin chains

Infinite Chiral Symmetry in Four Dimensions

Scalar Simplified Models and Dark Matter at Colliders

Cosmic flows: testing gravity and the matter power spectrum on very large scales

14/15 PSI Quantum Theory-7

14/15 PSI - Relativity- Lecture 7

14/15 PSI Quantum Theory-6

14/15 PSI - Relativity- Lecture 6

Maximal supergravity, holography and the Romans mass

14/15 PSI Quantum Theory-5

14/15 PSI - Relativity- Lecture 5

Stripes and pairing in t-J and Hubbard models

Self-assembling tensor networks and holography in disordered spin chains

Infinite Chiral Symmetry in Four Dimensions

Scalar Simplified Models and Dark Matter at Colliders

Cosmic flows: testing gravity and the matter power spectrum on very large scales

14/15 PSI Quantum Theory-7

14/15 PSI - Relativity- Lecture 7

14/15 PSI Quantum Theory-6

14/15 PSI - Relativity- Lecture 6

Maximal supergravity, holography and the Romans mass

14/15 PSI Quantum Theory-5

14/15 PSI - Relativity- Lecture 5

Stripes and pairing in t-J and Hubbard models