Talks

9157 - 9168 of 16889 Results

De Sitter Wavefunctionals and the Resummation of Time

Matthew Baumgart Carnegie Mellon University

October 07, 2014

PIRSA:14100051

Particle Physics
Flux Compactifications Grow Lumps

Claire Zukowski University of Minnesota Duluth

October 07, 2014

PIRSA:14100081

Cosmology
14/15 PSI - Statistical Mechanics - Lecture 2

Anton Burkov University of Waterloo

October 07, 2014

PIRSA:14100085
Computer Algebra for Theoretical Physics

Edgardo Cheb-Terrab Maplesoft

October 07, 2014

PIRSA:14100068
14/15 PSI - Quantum Field Theory I (A) - Lecture 1

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 06, 2014

PIRSA:14100027
14/15 PSI - Conformal Field Theory- Lecture 1

Jaume Gomis Perimeter Institute for Theoretical Physics

October 06, 2014

PIRSA:14100008
14/15 PSI - Statistical Mechanics - Lecture 1

Anton Burkov University of Waterloo

October 06, 2014

PIRSA:14100082
PHYS 781 - Lecture 6

Niayesh Afshordi University of Waterloo

October 03, 2014

PIRSA:14100061
PHYS 781 - Lecture 5

Niayesh Afshordi University of Waterloo

October 02, 2014

PIRSA:14100056
Probing (beyond) general relativity with compact binaries and gravitational waves

Leo Stein Cornell University

October 02, 2014

PIRSA:14100003

Strong Gravity
The Effective Field Theory of Cosmological Large Scale Structures

Leonardo Senatore ETH Zurich

October 02, 2014

PIRSA:14090041

Cosmology
Quantum Entanglement and Superconductivity

Subir Sachdev Harvard University

October 01, 2014

PIRSA:14100080

Condensed Matter

De Sitter Wavefunctionals and the Resummation of Time

Matthew Baumgart Carnegie Mellon University

October 07, 2014

PIRSA:14100051

Particle Physics

The holographic RG of Anti-De Sitter gives a powerful clue about the underlying AdS/CFT correspondence. The question is whether similar hints can be found for the heretofore elusive holographic dual of De Sitter. The framework of stochastic inflation uses nonperturbative insight to tame bad behavior in the perturbation series of a massless scalar in DS at late times. Remarkably, this fully quantum system loses phase information in the leading approximation, but retains a probabilistic character and allows for a controlled prediction of late time Green's functions. Recasting this as a "resummation of time", we wish understand whether the distributions that result can be thought of as an attractive UV fixed point of a theory
living on a spacelike slice of DS. We derive stochastic inflation via the wavefunctional approach to Quantum Field Theory. This allows for the straightforward implementation of corrections to the original framework.
Flux Compactifications Grow Lumps

Claire Zukowski University of Minnesota Duluth

October 07, 2014

PIRSA:14100081

Cosmology

The simplest flux compactifications are highly symmetric—a q-form flux is wrapped uniformly around an extra-dimensional q-sphere. I will discuss a family of solutions that break the internal SO(q+1) symmetry of these solutions down to SO(q)×Z_2, and show that often at least one of them has lower vacuum energy, larger entropy, and is more stable than the symmetric solution. I will describe the phase diagram of lumpy solutions and provide an interpretation in terms of an effective potential. Finally, I will provide evidence that the perturbatively stable vacua have a non-perturbative instability to spontaneously sprout lumps; generically this new decay is exponentially faster than all other known decays of the model.
14/15 PSI - Statistical Mechanics - Lecture 2

Anton Burkov University of Waterloo

October 07, 2014

PIRSA:14100085
Computer Algebra for Theoretical Physics

Edgardo Cheb-Terrab Maplesoft

October 07, 2014

PIRSA:14100068

Generally speaking, physicists still experience that computing with paper and pencil is in most cases simpler than computing on a Computer Algebra worksheet. On the other hand, recent developments in the Maple system implemented most of the mathematical objects and mathematics used in theoretical physics computations, and dramatically approximated the notation used in the computer to the one used in paper and pencil, diminishing the learning gap and computer-syntax distraction to a strict minimum. In connection, in this talk the Physics project at Maplesoft is presented and the resulting Physics package illustrated tackling problems in classical and quantum mechanics, general relativity and field theory. In addition to the 10 a.m lecture, there will be a hands-on workshop at 1pm in the Alice Room. Feel free to join!
14/15 PSI - Quantum Field Theory I (A) - Lecture 1

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 06, 2014

PIRSA:14100027
14/15 PSI - Conformal Field Theory- Lecture 1

Jaume Gomis Perimeter Institute for Theoretical Physics

October 06, 2014

PIRSA:14100008
14/15 PSI - Statistical Mechanics - Lecture 1

Anton Burkov University of Waterloo

October 06, 2014

PIRSA:14100082
PHYS 781 - Lecture 6

Niayesh Afshordi University of Waterloo

October 03, 2014

PIRSA:14100061
PHYS 781 - Lecture 5

Niayesh Afshordi University of Waterloo

October 02, 2014

PIRSA:14100056
Probing (beyond) general relativity with compact binaries and gravitational waves

Leo Stein Cornell University

October 02, 2014

PIRSA:14100003

Strong Gravity

General relativity enjoys phenomenal success in agreeing with experiments and observations, but it must break down at some point. Astrophysics can give guidance for what type of theory may correct general relativity, if we know which phenomenology to look for. I will discuss the possible corrections to the structure of compact objects, the binary problem, and observations with pulsar timing and gravitational wave detection. These corrections are computed in specific effective theories, such as Einstein-dilaton-Gauss-Bonnet (EdGB) and dynamical Chern-Simons (dCS) gravity, and we may further generalize the common aspects of these theories to build a parametrized framework which captures a large number of effective field theories.
The Effective Field Theory of Cosmological Large Scale Structures

Leonardo Senatore ETH Zurich

October 02, 2014

PIRSA:14090041

Cosmology

The Effective Filed Theory of Large Scale Structures provides a novel framework to analytically compute the clustering of the Large Scale Structures in the weakly non-linear regime in a consistent and reliable way. The theory that describes the long wavelength fluctuations is obtained after integrating out the short distance modes and adding suitable operators that allow to correctly reconstruct the effect of short distance fluctuations at long distances. A few observables have been computed so far, and the results are extremely promising. I will discuss the formalism and the main results so far.
Quantum Entanglement and Superconductivity

Subir Sachdev Harvard University

October 01, 2014

PIRSA:14100080

Condensed Matter

Einstein called it “spooky action at a distance.” Entanglement is a counterintuitive feature of quantum theory by which two particles are deeply correlated even when separated by vast distances, such that a measurement of one particle instantaneously determines the state of another. Remarkably, quantum entanglement can also happen en masse, determining the macroscopic properties of many electrons in certain crystals. These newly discovered states of matter could lead to practical high-temperature superconductors, which promise tremendous advances in technologies spanning medicine, clean energy, transportation, and more. Dr. Subir Sachdev, a leading researcher in the field, will explain new experiments in high-temperature superconductivity, and even do a live demonstration of superconducting levitation. He will even explore the unexpected new connections between these earthbound experiments and the strange quantum behaviour of black holes.

Title	Date	Collection	Type	Info
De Sitter Wavefunctionals and the Resummation of Time	2014‑10‑07	Particle Physics	Scientific Series	View details
Flux Compactifications Grow Lumps	2014‑10‑07	Cosmology and Gravitation	Scientific Series	View details
14/15 PSI - Statistical Mechanics - Lecture 2	2014‑10‑07	14/15 PSI - Statistical Mechanics	Course	View details
Computer Algebra for Theoretical Physics	2014‑10‑07		Scientific Series	View details
14/15 PSI - Quantum Field Theory I (A) - Lecture 1	2014‑10‑06	14/15 PSI - Quantum Field Theory	Course	View details
14/15 PSI - Conformal Field Theory- Lecture 1	2014‑10‑06	14/15 PSI - Conformal Field Theory	Course	View details
14/15 PSI - Statistical Mechanics - Lecture 1	2014‑10‑06	14/15 PSI - Statistical Mechanics	Course	View details
PHYS 781 - Lecture 6	2014‑10‑03	PHYS 781 - Fundamentals of Astrophysics	Course	View details
PHYS 781 - Lecture 5	2014‑10‑02	PHYS 781 - Fundamentals of Astrophysics	Course	View details
Probing (beyond) general relativity with compact binaries and gravitational waves	2014‑10‑02	Strong Gravity	Scientific Series	View details
The Effective Field Theory of Cosmological Large Scale Structures	2014‑10‑02	Cosmology and Gravitation	Scientific Series	View details
Quantum Entanglement and Superconductivity	2014‑10‑01	Public Lecture Series	Public Lectures	View details

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