Talks

10357 - 10368 of 16754 Results

Results and highlights from Planck

Kendrick Smith Perimeter Institute for Theoretical Physics

April 16, 2013

PIRSA:13040123

Cosmology
12/13 PSI - Explorations in Cosmology Lecture 7

Matthew Johnson York University

April 16, 2013

PIRSA:13040070

Cosmology
Continuous-variable entanglement distillation and non-commutative central limit theorems

Earl Campbell University of Sheffield

April 15, 2013

PIRSA:13040122

Quantum Information
12/13 PSI - Explorations in String Theory Lecture 6

Pedro Vieira Perimeter Institute for Theoretical Physics

April 15, 2013

PIRSA:13040091

Quantum Fields and Strings
12/13 PSI - Explorations in Cosmology Lecture 6

Matthew Johnson York University

April 15, 2013

PIRSA:13040069

Cosmology
12/13 PSI - Explorations in String Theory Lecture 5

Pedro Vieira Perimeter Institute for Theoretical Physics

April 12, 2013

PIRSA:13040088

Quantum Fields and Strings
12/13 PSI - Explorations in Cosmology Lecture 5

Matthew Johnson York University

April 12, 2013

PIRSA:13040066

Cosmology
Advanced General Relativity - Lecture 24

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 11, 2013

PIRSA:13040010
Quantum causal dynamics without absolute space or time

April 11, 2013

PIRSA:13040083

Quantum Gravity
Spinning black-hole binaries as gravitational and cosmological probes

Enrico Barausse SISSA International School for Advanced Studies

April 11, 2013

PIRSA:13040082

Strong Gravity
12/13 PSI - Explorations in String Theory Lecture 4

Pedro Vieira Perimeter Institute for Theoretical Physics

April 11, 2013

PIRSA:13040087

Quantum Fields and Strings
Large Scale Bayesian Inference in Cosmology

Jens Jasche Institut d'Astrophysique de Paris

April 11, 2013

PIRSA:13040119

Cosmology

Results and highlights from Planck

Kendrick Smith Perimeter Institute for Theoretical Physics

April 16, 2013

PIRSA:13040123

Cosmology

Cosmological results from Planck, a third-generation satellite mission to measure the cosmic microwave background, have just been announced. These results improve constraints on essentially all cosmological parameters, and have implications for several preexisting sources of tension with the standard cosmological model, while also raising new puzzles. I will discuss these results and their significance, as well as the next steps forward.
12/13 PSI - Explorations in Cosmology Lecture 7

Matthew Johnson York University

April 16, 2013

PIRSA:13040070

Cosmology
Continuous-variable entanglement distillation and non-commutative central limit theorems

Earl Campbell University of Sheffield

April 15, 2013

PIRSA:13040122

Quantum Information

Entanglement distillation transforms weakly entangled noisy states into highly entangled states, a primitive to be used in quantum repeater schemes and other protocols designed for quantum communication and key distribution. In this work, we present a comprehensive framework for continuous-variable entanglement distillation schemes that convert noisy non-Gaussian states into Gaussian ones in many iterations of the protocol. Instances of these protocols include the recursive Gaussifier protocol and the pumping Gaussifier protocol. The flexibility of these protocols give rise to several beneficial trade-offs related to success probabilities or memory requirements that can be adjusted to reflect experimental specifics. Despite these protocols involving measurements, we relate the convergence in this protocols to new instances of non-commutative central limit theorems. Implications of the findings for quantum repeater schemes are discussed.
12/13 PSI - Explorations in String Theory Lecture 6

Pedro Vieira Perimeter Institute for Theoretical Physics

April 15, 2013

PIRSA:13040091

Quantum Fields and Strings
12/13 PSI - Explorations in Cosmology Lecture 6

Matthew Johnson York University

April 15, 2013

PIRSA:13040069

Cosmology
12/13 PSI - Explorations in String Theory Lecture 5

Pedro Vieira Perimeter Institute for Theoretical Physics

April 12, 2013

PIRSA:13040088

Quantum Fields and Strings
12/13 PSI - Explorations in Cosmology Lecture 5

Matthew Johnson York University

April 12, 2013

PIRSA:13040066

Cosmology
Advanced General Relativity - Lecture 24

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 11, 2013

PIRSA:13040010
Quantum causal dynamics without absolute space or time

April 11, 2013

PIRSA:13040083

Quantum Gravity

I will describe a discrete model of spacetime which is quantum-mechanical, causal, and background free. The kinematics is described by networks whose vertices are labelled with arrows. These networks can be evolved forwards (or backwards) in time by using unitary replacement rules. The arrow structure permits one to define dynamics without using an absolute time parameter. Based on arXiv:1201.2489.
Spinning black-hole binaries as gravitational and cosmological probes

Enrico Barausse SISSA International School for Advanced Studies

April 11, 2013

PIRSA:13040082

Strong Gravity
12/13 PSI - Explorations in String Theory Lecture 4

Pedro Vieira Perimeter Institute for Theoretical Physics

April 11, 2013

PIRSA:13040087

Quantum Fields and Strings
Large Scale Bayesian Inference in Cosmology

Jens Jasche Institut d'Astrophysique de Paris

April 11, 2013

PIRSA:13040119

Cosmology

Already the last decade has witnessed unprecedented progress in the collection of cosmological data. Presently proposed and designed future cosmological probes and surveys permit us to anticipate the upcoming avalanche of cosmological information during the next decades.
The increase of valuable observations needs to be accompanied with the development of efficient and accurate information processing technology in order to analyse and interpret this data. In particular, cosmography projects, aiming at studying the origin and inhomogeneous evolution of
the Universe, involve high dimensional inference methods. For example, 3d cosmological density and velocity field inference requires to explore on the order of 10^7 or more parameters. Consequently, such projects critically rely on state-of-the-art information processing techniques
and, nevertheless, are often on the verge of numerical feasibility with present day computational resources. For this reason, in this talk I will address the problem of high dimensional Bayesian inference from cosmological data sets, subject to a variety of statistical and systematic uncertainties. In particular, I will focus on the discussion of selected Markov Chain Monte Carlo techniques, permitting to efficiently solve inference problems with on the order of 10^7 parameters. Furthermore, these methods will be exemplified in various cosmological applications, raging from 3d non-linear density and photometric redshift inference to 4d physical state inference. These techniques permit us to exploit cosmologically relevant information from
observations to unprecedented detail and hence will significantly contribute to the era of precision cosmology.

Title	Date	Collection	Type	Info
Results and highlights from Planck	2013‑04‑16	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - Explorations in Cosmology Lecture 7	2013‑04‑16	12/13 PSI - Explorations in Cosmology	Course	View details
Continuous-variable entanglement distillation and non-commutative central limit theorems	2013‑04‑15	Perimeter Institute Quantum Discussions	Scientific Series	View details
12/13 PSI - Explorations in String Theory Lecture 6	2013‑04‑15	12/13 PSI - Eplorations in String Theory	Course	View details
12/13 PSI - Explorations in Cosmology Lecture 6	2013‑04‑15	12/13 PSI - Explorations in Cosmology	Course	View details
12/13 PSI - Explorations in String Theory Lecture 5	2013‑04‑12	12/13 PSI - Eplorations in String Theory	Course	View details
12/13 PSI - Explorations in Cosmology Lecture 5	2013‑04‑12	12/13 PSI - Explorations in Cosmology	Course	View details
Advanced General Relativity - Lecture 24	2013‑04‑11	Elements of General Relativity	Course	View details
Quantum causal dynamics without absolute space or time	2013‑04‑11	Quantum Gravity	Scientific Series	View details
Spinning black-hole binaries as gravitational and cosmological probes	2013‑04‑11	Strong Gravity	Scientific Series	View details
12/13 PSI - Explorations in String Theory Lecture 4	2013‑04‑11	12/13 PSI - Eplorations in String Theory	Course	View details
Large Scale Bayesian Inference in Cosmology	2013‑04‑11	Cosmology and Gravitation	Scientific Series	View details

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