Talks

12769 - 12780 of 20118 Results

Advanced General Relativity - Lecture 17

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 19, 2013

PIRSA:13030020
Evidence for a new particle on the worldsheet of the QCD flux tube

Sergei Dubovsky New York University (NYU)

March 19, 2013

PIRSA:13030109

High Energy Physics
Learning what the Higgs is mixed with

Kunal Kumar Carleton University

March 19, 2013

PIRSA:13030089

High Energy Physics
The Effective Field Theory of Large Scale Structures

Enrico Pajer Utrecht University

March 19, 2013

PIRSA:13030110

Astrophysics
12/13 PSI - Explorations in Particle Theory Lecture 2

David Morrissey TRIUMF

March 19, 2013

PIRSA:13030066

High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 2

David Cory Institute for Quantum Computing (IQC)

March 19, 2013

PIRSA:13030055

Quantum Physics
12/13 PSI - Explorations in Particle Theory Lecture 1

David Morrissey TRIUMF

March 18, 2013

PIRSA:13030065

High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 1

David Cory Institute for Quantum Computing (IQC)

March 18, 2013

PIRSA:13030054

Quantum Physics
Advanced General Relativity - Lecture 16

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 14, 2013

PIRSA:13030015
A CDT Hamiltonian from Horava-Lifshitz gravity

Yuki Sato Nagoya University

March 14, 2013

PIRSA:13030091

General Relativity & Quantum Cosmology
The dynamics of asymptotically anti-de Sitter spacetimes

Claude Warnick

March 14, 2013

PIRSA:13030077

General Relativity & Quantum Cosmology
The Higgs confronts 3 universes at the LHC

Markus Luty University of California, Davis

March 13, 2013

PIRSA:13030095

High Energy Physics

Advanced General Relativity - Lecture 17

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 19, 2013

PIRSA:13030020
Evidence for a new particle on the worldsheet of the QCD flux tube

Sergei Dubovsky New York University (NYU)

March 19, 2013

PIRSA:13030109

High Energy Physics

We propose a new approach for the calculation of the spectrum of excitations of QCD flux tubes. It relies on the fact that the worldsheet theory is integrable at low energies. With this approach, energy levels can be calculated for much shorter flux tubes than was previously possible, allowing for a quantitative comparison with existing lattice data. The improved theoretical control makes it manifest that existing lattice data provides strong evidence for a new pseudoscalar particle localized on the QCD fluxtube - the worldsheet axion.
Learning what the Higgs is mixed with

Kunal Kumar Carleton University

March 19, 2013

PIRSA:13030089

High Energy Physics

The Standard Model Higgs boson may be mixed with another scalar that does not couple singly to gauge bosons or fermions. The electroweak quantum numbers of such an additional scalar can be determined by measuring the quartic Higgs-Higgs-vector-vector couplings, which contribute—along with the coveted triple Higgs coupling—to double Higgs production in e+e− collisions. We show that simultaneous sensitivity to the quartic Higgs-Higgs-vector-vector coupling and the triple Higgs coupling can be obtained using measurements of the double Higgs production cross section at two different e+e− center-of-mass energies. Kinematic distributions of the two Higgs bosons in the final state could provide additional discriminating power.
The Effective Field Theory of Large Scale Structures

Enrico Pajer Utrecht University

March 19, 2013

PIRSA:13030110

Astrophysics

An analytical understanding of large-scale matter inhomogeneities is an important cornerstone of our cosmological model and helps us interpreting current and future data. The standard approach, namely Eulerian perturbation theory, is unsatisfactory for at least three reasons: there is no clear expansion parameter since the density contrast is not small everywhere; it does not consistently account for deviations at large scales from a perfect pressureless fluid induced by short-scale non-linearities; for generic initial conditions, loop corrections are UV divergent, making predictions cutoff dependent and hence unphysical. I will present the systematic construction of an Effective Field Theory of Large Scale Structures and show that it successfully addresses all of the above issues. The idea is to smooth the density and velocity fields on a scale larger than the non-linear scale. The resulting smoothed fields are then small everywhere and provide a well-defined small parameter for perturbation theory. Smoothing amounts to integrating out the short scales, whose non-linear dynamics is hard to describe analytically. Their effects on the large scales are then determined by the symmetries of the problems. They introduce additional terms in the fluid equations such as an effective pressure, dissipation and stochastic noise. These terms have exactly the right scale dependence to cancel all divergences at one loop, and this should hold at all loops.
I will present a clean example of the renormalization of the theory in an Einstein de Sitter universe with self-similar initial conditions and discuss the relative importance of loop and effective corrections.
12/13 PSI - Explorations in Particle Theory Lecture 2

David Morrissey TRIUMF

March 19, 2013

PIRSA:13030066

High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 2

David Cory Institute for Quantum Computing (IQC)

March 19, 2013

PIRSA:13030055

Quantum Physics
12/13 PSI - Explorations in Particle Theory Lecture 1

David Morrissey TRIUMF

March 18, 2013

PIRSA:13030065

High Energy Physics
12/13 PSI - Explorations on Quantum Information Lecture 1

David Cory Institute for Quantum Computing (IQC)

March 18, 2013

PIRSA:13030054

Quantum Physics
Advanced General Relativity - Lecture 16

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 14, 2013

PIRSA:13030015
A CDT Hamiltonian from Horava-Lifshitz gravity

Yuki Sato Nagoya University

March 14, 2013

PIRSA:13030091

General Relativity & Quantum Cosmology

Causal Dynamical Triangulations” (CDT) is a lattice theory where aspects of quantum gravity can be studied. Two-dimensional CDT can be solved analytically and the continuum (quantum) Hamiltonian obtained.
In this talk I will show that this continuum Hamiltonian is the one obtained by quantizing two-dimensional projectable Horava-Lifshitz gravity.
The dynamics of asymptotically anti-de Sitter spacetimes

Claude Warnick

March 14, 2013

PIRSA:13030077

General Relativity & Quantum Cosmology

The majority of work on asymptotically anti-de Sitter spacetimes, much of it motivated by the AdS/CFT correspondence, assumes configurations which are either at or close to equilibrium. Recently it has been discovered that genuinely dynamical spacetimes with AdS asymptotics can exhibit some surprising behaviour. In particular, numerical studies suggest AdS is dynamically unstable. I will discuss recent analytical (in)stability results for asymptotically AdS spacetimes, in particular how stability can be affected by boundary conditions at the timelike conformal infinity.
The Higgs confronts 3 universes at the LHC

Markus Luty University of California, Davis

March 13, 2013

PIRSA:13030095

High Energy Physics

The recent discovery of the Higgs boson is a fundamental advance in particle physics. This talk gives a theorist's perspective of the significance of this discovery. The Higgs boson was proposed in the 1960s, but it is best understood in the context of the quest to understand the weak interactions, which began with Fermi's theory of weak interactions almost 80 years ago. This has led to three very different paradigms for the structure of fundamental interactions at the TeV scale: supersymmetry, compositeness/extra dimensions, and anthropic selection. The Large Hadron Collider is the experimentum crucis for deciding between these different possible universes, and the discovery of the Higgs is a crucial clue. This talk will describe these paradigms, the implications of the Higgs discovery for them, and the outlook for further discoveries that would decide between them.

Title	Date	Collection	Type	Info
Advanced General Relativity - Lecture 17	2013‑03‑19	Elements of General Relativity	Course	View details
Evidence for a new particle on the worldsheet of the QCD flux tube	2013‑03‑19	Quantum Fields and Strings	Scientific Series	View details
Learning what the Higgs is mixed with	2013‑03‑19	Particle Physics	Scientific Series	View details
The Effective Field Theory of Large Scale Structures	2013‑03‑19	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 2	2013‑03‑19	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 2	2013‑03‑19	12/13 PSI - Explorations on Quantum Information	Course	View details
12/13 PSI - Explorations in Particle Theory Lecture 1	2013‑03‑18	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 1	2013‑03‑18	12/13 PSI - Explorations on Quantum Information	Course	View details
Advanced General Relativity - Lecture 16	2013‑03‑14	Elements of General Relativity	Course	View details
A CDT Hamiltonian from Horava-Lifshitz gravity	2013‑03‑14	Quantum Gravity	Scientific Series	View details
The dynamics of asymptotically anti-de Sitter spacetimes	2013‑03‑14	Strong Gravity	Scientific Series	View details
The Higgs confronts 3 universes at the LHC	2013‑03‑13	Colloquium	Scientific Series	View details

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Format results

Advanced General Relativity - Lecture 17

Evidence for a new particle on the worldsheet of the QCD flux tube

Learning what the Higgs is mixed with

The Effective Field Theory of Large Scale Structures

12/13 PSI - Explorations in Particle Theory Lecture 2

12/13 PSI - Explorations on Quantum Information Lecture 2

12/13 PSI - Explorations in Particle Theory Lecture 1

12/13 PSI - Explorations on Quantum Information Lecture 1

Advanced General Relativity - Lecture 16

A CDT Hamiltonian from Horava-Lifshitz gravity

The dynamics of asymptotically anti-de Sitter spacetimes

The Higgs confronts 3 universes at the LHC

Advanced General Relativity - Lecture 17

Evidence for a new particle on the worldsheet of the QCD flux tube

Learning what the Higgs is mixed with

The Effective Field Theory of Large Scale Structures

12/13 PSI - Explorations in Particle Theory Lecture 2

12/13 PSI - Explorations on Quantum Information Lecture 2

12/13 PSI - Explorations in Particle Theory Lecture 1

12/13 PSI - Explorations on Quantum Information Lecture 1

Advanced General Relativity - Lecture 16

A CDT Hamiltonian from Horava-Lifshitz gravity

The dynamics of asymptotically anti-de Sitter spacetimes

The Higgs confronts 3 universes at the LHC