Talks

10393 - 10404 of 16754 Results

Advanced General Relativity - Lecture 21

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 02, 2013

PIRSA:13040001
Three-point functions: SFT, integrability, and perturbative calculations.

April 02, 2013

PIRSA:13040110

Quantum Fields and Strings
To Split or Not to Split

Asimina Arvanitaki Perimeter Institute for Theoretical Physics

April 02, 2013

PIRSA:13040115

Particle Physics
12/13 PSI - Explorations in Particle Theory Lecture 11

David Morrissey TRIUMF

April 02, 2013

PIRSA:13040039

Particle Physics
Shake, Rattle and Explode: Short GRBs and the Electromagnetic Counterparts of Gravitational Wave Sources

Edo Berger Harvard University

April 02, 2013

PIRSA:13040081

Cosmology

Strong Gravity
12/13 PSI - Explorations on Quantum Information Lecture 11

David Cory Institute for Quantum Computing (IQC)

April 02, 2013

PIRSA:13040034

Quantum Information
12/13 PSI - Explorations in Particle Theory Lecture 10

David Morrissey TRIUMF

April 01, 2013

PIRSA:13040038

Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 10

David Cory Institute for Quantum Computing (IQC)

April 01, 2013

PIRSA:13040033

Quantum Information
Advanced General Relativity - Lecture 20

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 28, 2013

PIRSA:13030029
S=1 spin liquid with fermionic excitations

Maksym Serbyn Massachusetts Institute of Technology (MIT)

March 28, 2013

PIRSA:13030113

Condensed Matter
Canonical gravity using unconstrained null initial data

Michael Reisenberger Universidad de la Republica Uruguay

March 28, 2013

PIRSA:13030092

Strong Gravity
12/13 PSI - Explorations in Particle Theory Lecture 9

David Morrissey TRIUMF

March 28, 2013

PIRSA:13030075

Particle Physics

Advanced General Relativity - Lecture 21

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 02, 2013

PIRSA:13040001
Three-point functions: SFT, integrability, and perturbative calculations.

April 02, 2013

PIRSA:13040110

Quantum Fields and Strings

I discuss several recent efforts in relating string field theory calculations of BMN BMN BMN and BMN BMN BPS correlation functions to direct perturbative calculations and integrability-assisted methods. I review the next-to-leading order agreement between strings and perturbation theory in the SO(6) sector, a conjectured extension of the integrability techniques by Escobedo, Gromov, Sever, Vieira from the SU(2) to the full SO(6) sector and agreement with SFT and PT in it at the leading order; finally, I discuss the issue of equating exactly extremal and non-extremal correlators at NLO in the integrability-assisted calculation.
To Split or Not to Split

Asimina Arvanitaki Perimeter Institute for Theoretical Physics

April 02, 2013

PIRSA:13040115

Particle Physics

Physics is at a crossroad that leads either to Naturalness or the Multiverse. While the confirmation of gauge coupling unification in the early 90s gave a tremendous boost to naturalness and to low energy SUSY, the lack of evidence for new physics beyond the standard model at the LHC points to a paucity of new particles near the weak scale. This suggests that the weak scale is tuned and that supersymmetry, if present at all, is realized at higher energies. This points to Split SUSY, a framework motivated by the String Landscape. Fine-tuning electroweak symmetry breaking and the renormalization group evolution of the scalar masses constrains Split model building and I review the expectations at the LHC for the different possible Split SUSY particle spectra.
12/13 PSI - Explorations in Particle Theory Lecture 11

David Morrissey TRIUMF

April 02, 2013

PIRSA:13040039

Particle Physics
Shake, Rattle and Explode: Short GRBs and the Electromagnetic Counterparts of Gravitational Wave Sources

Edo Berger Harvard University

April 02, 2013

PIRSA:13040081

Cosmology

Strong Gravity

The bimodality of gamma-ray burst (GRB) durations points to distinct progenitor classes for the long- and short-duration GRBs. While the progenitors of long-duration GRBs are now known to be massive stars, the progenitors of short-duration GRBs remain unidentified. In this talk I will discuss the discovery of short GRB afterglow and their host galaxies, detailed studies of their environments from parsec to galactic scales, and studies of their energetics and beaming. Taken together, these observations point to the coalescence of NS-NS/NS-BH binaries as the most likely progenitors. With the upcoming Advanced LIGO/VIRGO gravitational wave detectors it is therefore possible that short GRBs will be the first detected sources, and I will discuss various approaches to making this connection between gravitational wave and electromagnetic sources.
12/13 PSI - Explorations on Quantum Information Lecture 11

David Cory Institute for Quantum Computing (IQC)

April 02, 2013

PIRSA:13040034

Quantum Information
12/13 PSI - Explorations in Particle Theory Lecture 10

David Morrissey TRIUMF

April 01, 2013

PIRSA:13040038

Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 10

David Cory Institute for Quantum Computing (IQC)

April 01, 2013

PIRSA:13040033

Quantum Information
Advanced General Relativity - Lecture 20

Rafael Sorkin Perimeter Institute for Theoretical Physics

March 28, 2013

PIRSA:13030029
S=1 spin liquid with fermionic excitations

Maksym Serbyn Massachusetts Institute of Technology (MIT)

March 28, 2013

PIRSA:13030113

Condensed Matter

In the first part of my talk I describe a search for possible quantum spin liquid ground states for spin S=1 Heisenberg models on the triangular lattice which was motivated by recent experiments on Ba3NiSb2O9. We use representation of spin-1 via three flavors of fermionic spinon operators. The ground state where one gapless flavor of spinons with a Fermi surface coexists with d+id topological pairing of the two other flavors can explain available experimental data. Despite the existence of a Fermi surface, this spin liquid state has fully gapped bulk spin excitations. This results in a linear in-temperature specific heat and constant in-plane spin susceptibility, with an unusually high Wilson ratio. Using variational Monte Carlo technique, we show that proposed spin liquid ground state is realized in an SU(3)-invariant model with sufficiently strong ring-exchange terms. In the second part, I consider the physics of the magnetic s=1/2 impurity embedded in a S=1 spin liquid, where all three flavors of spinons have a Fermi surface. The interplay between non-Fermi-liquid behavior induced by a U(1) gauge field coupled to fermions, and a non-Fermi-liquid fixed point in the overscreened Kondo problem is studied using double expansion. The gauge field changes the physical properties of the system at the overscreened Kondo fixed point. Thus, spin-half impurity in such spin liquid can be used to probe the presence of fermionic spinons coupled to the gauge field. References: arXiv:1108.3070, arXiv:1208.3231 and arXiv:1212.5179
Canonical gravity using unconstrained null initial data

Michael Reisenberger Universidad de la Republica Uruguay

March 28, 2013

PIRSA:13030092

Strong Gravity
12/13 PSI - Explorations in Particle Theory Lecture 9

David Morrissey TRIUMF

March 28, 2013

PIRSA:13030075

Particle Physics

Title	Date	Collection	Type	Info
Advanced General Relativity - Lecture 21	2013‑04‑02	Elements of General Relativity	Course	View details
Three-point functions: SFT, integrability, and perturbative calculations.	2013‑04‑02	Quantum Fields and Strings	Scientific Series	View details
To Split or Not to Split	2013‑04‑02	Particle Physics	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 11	2013‑04‑02	12/13 PSI - Explorations in Particle Theory	Course	View details
Shake, Rattle and Explode: Short GRBs and the Electromagnetic Counterparts of Gravitational Wave Sources	2013‑04‑02	Strong Gravity	Scientific Series	View details
12/13 PSI - Explorations on Quantum Information Lecture 11	2013‑04‑02	12/13 PSI - Explorations on Quantum Information	Course	View details
12/13 PSI - Explorations in Particle Theory Lecture 10	2013‑04‑01	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 10	2013‑04‑01	12/13 PSI - Explorations on Quantum Information	Course	View details
Advanced General Relativity - Lecture 20	2013‑03‑28	Elements of General Relativity	Course	View details
S=1 spin liquid with fermionic excitations	2013‑03‑28	Quantum Matter	Scientific Series	View details
Canonical gravity using unconstrained null initial data	2013‑03‑28	Quantum Gravity	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 9	2013‑03‑28	12/13 PSI - Explorations in Particle Theory	Course	View details

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