Talks

10417 - 10428 of 16447 Results

Quantum Field Theory 2 - Lecture 6

Francois David
CEA Saclay

November 19, 2012

PIRSA:12110007

Quantum Fields and Strings
Superradiant Superconductivity

Baskaran Ganapathy
Institute of Mathematical Sciences

November 16, 2012

PIRSA:12110071

Condensed Matter
Statistical Mechanics - Lecture 5

John Berlinsky
McMaster University

November 16, 2012

PIRSA:12110023
Quantum Field Theory 2 - Lecture 5

Francois David
CEA Saclay

November 16, 2012

PIRSA:12110004

Quantum Fields and Strings
Canonical tensor models with local time

Naoki Sasakura
Yukawa Institute for Theoretical Physics

November 15, 2012

PIRSA:12110065

Quantum Gravity
Detecting Gravitational Waves with Millisecond Pulsars

Paul Demorest
National Radio Astronomy Observatory (NRAO)

November 15, 2012

PIRSA:12110044

Strong Gravity
Solid of Inflation: An alternative symmetry breaking pattern for an EFT of inflation

Solomon Endlich
Stanford University

November 15, 2012

PIRSA:13010005

Cosmology
Statistical Mechanics - Lecture 4

John Berlinsky
McMaster University

November 15, 2012

PIRSA:12110022
Quantum Field Theory 2 - Lecture 4

Francois David
CEA Saclay

November 15, 2012

PIRSA:12110003

Quantum Fields and Strings
Modified Gravity, Dark Matter and Dark Energy: Deep Mysteries of the Universe

John Moffat
Perimeter Institute for Theoretical Physics

November 14, 2012

PIRSA:12110074

Cosmology
Massive gravitons, the cosmological constant and new directions in gravity

November 14, 2012

PIRSA:12110061

Cosmology
Statistical Mechanics - Lecture 3

John Berlinsky
McMaster University

November 14, 2012

PIRSA:12110021

Quantum Field Theory 2 - Lecture 6

Francois David
CEA Saclay

November 19, 2012

PIRSA:12110007

Quantum Fields and Strings
Superradiant Superconductivity

Baskaran Ganapathy
Institute of Mathematical Sciences

November 16, 2012

PIRSA:12110071

Condensed Matter

In Dicke Superradiance, a collection of 2-level atoms interacting with a single boson mode acquires, through quantum coherence, an enhanced emission property and a rich dynamics. We suggest possibility of Dicke superradiance in a BCS superconductor. The necessary 2-level atoms are identified with Anderson pseudo spins seeing a self consistent mean field in k-space. A way to couple these 2-level bose atoms to an external boson mode and create a novel non equilibrium superradiant superconductivity (SRSC) is suggested. Our mechanism offers a hope to realize transient superconductivity, even at room temperatures, in the pseudo gap phase of certain underdoped cuprates. Recent experiments are briefly discussed in this light. Further SRSC exhibits interesting quantum entanglement and superfluorescence properties.
Statistical Mechanics - Lecture 5

John Berlinsky
McMaster University

November 16, 2012

PIRSA:12110023
Quantum Field Theory 2 - Lecture 5

Francois David
CEA Saclay

November 16, 2012

PIRSA:12110004

Quantum Fields and Strings
Canonical tensor models with local time

Naoki Sasakura
Yukawa Institute for Theoretical Physics

November 15, 2012

PIRSA:12110065

Quantum Gravity

Tensor models are generalization of matrix models, and are studied as discrete models for quantum gravity for more than two-dimensions. Among them, the rank-three tensor models can be interpreted as theories of dynamical fuzzy spaces, and they generally have the feature of
respecting symmetries. In this talk, after briefly reviewing some results on Euclidean models such as spontaneous generation of fuzzy spaces and Euclidean general relativity respecting the diffeomorphism symmetry on them, I will present a way to introduce “local” time to the rank-three tensor models by constructing “local” Hamiltonians. The consistency among the multiple ways of local time evolutions is guaranteed by the on-shell closure of the constraint algebra among the
local Hamiltonians and the symmetry generators of the tensor models. The constraint algebra is shown to approach the DeWitt algebra in a formal continuum limit. I will also discuss the two-fold uniqueness of the local Hamiltonians, and will briefly show some preliminary results on the quantization.
Detecting Gravitational Waves with Millisecond Pulsars

Paul Demorest
National Radio Astronomy Observatory (NRAO)

November 15, 2012

PIRSA:12110044

Strong Gravity

Millisecond spin-period radio pulsars provide us with unique astronomical "laboratories" for exploring fundamental physics in a variety of ways -- from the physics of matter at super-nuclear density, to experimental tests of gravity. They have also provided the only experimental evidence so far for the existence of gravitational waves (GW). A set of millisecond pulsars acting as precise astronomical clocks may also be used as a direct GW detector, sensitive to the nanohertz-frequency GW expected to be emitted by supermassive black hole binary systems or other more exotic sources. In this talk I will present the project status and recent GW upper limits from the NANOGrav project. I will also discuss expected near-future improvements in the measurement, including recent work aimed at better characterizing and mitigating the effect of multi-path propagation effects in the interstellar medium.
Solid of Inflation: An alternative symmetry breaking pattern for an EFT of inflation

Solomon Endlich
Stanford University

November 15, 2012

PIRSA:13010005

Cosmology

In this talk I will discuss a cosmological model where primordial inflation is driven by a `solid', defined as a system of three derivatively coupled scalar fields obeying certain symmetries and spontaneously breaking a certain subgroup of these. The symmetry breaking pattern differs drastically from that of standard inflationary models: time translations are unbroken. This prevents our model from fitting into the standard effective field theory description of adiabatic perturbations. Consequently, it exhibits a novel non-Gaussian `shape'.
Statistical Mechanics - Lecture 4

John Berlinsky
McMaster University

November 15, 2012

PIRSA:12110022
Quantum Field Theory 2 - Lecture 4

Francois David
CEA Saclay

November 15, 2012

PIRSA:12110003

Quantum Fields and Strings
Modified Gravity, Dark Matter and Dark Energy: Deep Mysteries of the Universe

John Moffat
Perimeter Institute for Theoretical Physics

November 14, 2012

PIRSA:12110074

Cosmology
Massive gravitons, the cosmological constant and new directions in gravity

November 14, 2012

PIRSA:12110061

Cosmology

The solutions to the cosmological constant problems may involve modifying the very long-range dynamics of gravity by adding new degrees of freedom. As an example of a conservative and minimal such modification, we consider the possibility that the graviton has a very small mass. Massive gravity has received renewed interest due to recent advances which have resolved its traditional problems. This kind of modification has some peculiar and unexpected features, and it points us towards a universe which looks quite unfamiliar.
Support for this colloquium is provided by The Templeton Frontiers Program.
Statistical Mechanics - Lecture 3

John Berlinsky
McMaster University

November 14, 2012

PIRSA:12110021

Title	Date	Collection	Type	Info
Quantum Field Theory 2 - Lecture 6	2012‑11‑19	12/13 PSI - Quantum Field Theory 2	Course	View details
Superradiant Superconductivity	2012‑11‑16	Quantum Matter	Scientific Series	View details
Statistical Mechanics - Lecture 5	2012‑11‑16	12/13 PSI - Statistical Mechanics	Course	View details
Quantum Field Theory 2 - Lecture 5	2012‑11‑16	12/13 PSI - Quantum Field Theory 2	Course	View details
Canonical tensor models with local time	2012‑11‑15	Quantum Gravity	Scientific Series	View details
Detecting Gravitational Waves with Millisecond Pulsars	2012‑11‑15	Strong Gravity	Scientific Series	View details
Solid of Inflation: An alternative symmetry breaking pattern for an EFT of inflation	2012‑11‑15	Cosmology and Gravitation	Scientific Series	View details
Statistical Mechanics - Lecture 4	2012‑11‑15	12/13 PSI - Statistical Mechanics	Course	View details
Quantum Field Theory 2 - Lecture 4	2012‑11‑15	12/13 PSI - Quantum Field Theory 2	Course	View details
Modified Gravity, Dark Matter and Dark Energy: Deep Mysteries of the Universe	2012‑11‑14	Cosmology and Gravitation	Other	View details
Massive gravitons, the cosmological constant and new directions in gravity	2012‑11‑14	Colloquium	Scientific Series	View details
Statistical Mechanics - Lecture 3	2012‑11‑14	12/13 PSI - Statistical Mechanics	Course	View details

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