Talks

10741 - 10752 of 18366 Results

12/13 PSI - Explorations in String Theory Lecture 4

Pedro Vieira Perimeter Institute for Theoretical Physics

April 11, 2013

PIRSA:13040087

High Energy Physics
Large Scale Bayesian Inference in Cosmology

Jens Jasche Institut d'Astrophysique de Paris

April 11, 2013

PIRSA:13040119

Astrophysics
12/13 PSI - Explorations in Cosmology Lecture 4

Matthew Johnson York University

April 11, 2013

PIRSA:13040065

Astrophysics
Topological insulator of bosons in 3d via dyon condensation and the statistical Witten effect.

Max Metlitski Massachusetts Institute of Technology (MIT) - Department of Physics

April 10, 2013

PIRSA:13040117

Condensed Matter
12/13 PSI - Explorations in String Theory Lecture 3

Pedro Vieira Perimeter Institute for Theoretical Physics

April 10, 2013

PIRSA:13040086

High Energy Physics
12/13 PSI - Explorations in Cosmology Lecture 3

Matthew Johnson York University

April 10, 2013

PIRSA:13040064

Astrophysics
Advanced General Relativity - Lecture 23

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 09, 2013

PIRSA:13040008
An infalling observer in AdS/CFT and the black hole information paradox

Kyriakos Papadodimas European Organization for Nuclear Research (CERN)

April 09, 2013

PIRSA:13040118

High Energy Physics
12/13 PSI - Explorations in String Theory Lecture 2

Pedro Vieira Perimeter Institute for Theoretical Physics

April 09, 2013

PIRSA:13040085

High Energy Physics
The Death Throes of Massive Stars: Supernovae, Black Holes, and Neutrinos

Evan O'Connor California Institute of Technology

April 09, 2013

PIRSA:13040120

Astrophysics
12/13 PSI - Explorations in Cosmology Lecture 2

Matthew Johnson York University

April 09, 2013

PIRSA:13040063

Astrophysics
Classical and quantum circuit obfuscation with braids

Stephen Jordan National Institute of Standards & Technology

April 08, 2013

PIRSA:13040111

Quantum Physics

12/13 PSI - Explorations in String Theory Lecture 4

Pedro Vieira Perimeter Institute for Theoretical Physics

April 11, 2013

PIRSA:13040087

High Energy Physics
Large Scale Bayesian Inference in Cosmology

Jens Jasche Institut d'Astrophysique de Paris

April 11, 2013

PIRSA:13040119

Astrophysics

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.
12/13 PSI - Explorations in Cosmology Lecture 4

Matthew Johnson York University

April 11, 2013

PIRSA:13040065

Astrophysics
Topological insulator of bosons in 3d via dyon condensation and the statistical Witten effect.

Max Metlitski Massachusetts Institute of Technology (MIT) - Department of Physics

April 10, 2013

PIRSA:13040117

Condensed Matter

In this talk, I will construct a symmetry protected topological phase of bosons in 3d with particle number conservation and time reversal symmetries, which is the direct bosonic analogue of the familiar electron topological insulator. The construction employs a parton decomposition of bosons, followed by condensation of parton-monopole composites. The surface of the resulting state supports a gapped symmetry respecting phase with intrinsic toric code topological order where both e and m anyons carry charge 1=2. It is well-known that one signature of the 3d electron topological insulator is the Witten eect: if the system is coupled to a compact electromagnetic gauge eld, a monopole in the bulk acquires a half-odd-integer polarization charge. I will discuss the corresponding phenomenon for the constructed topological insulator of bosons: a monopole can remain electrically neutral, but its statistics are transmuted from bosonic to fermionic. This \sta- tistical Witten eect" guarantees that the surface is either gapless, symmetry broken or carries an intrinsic topological order.
12/13 PSI - Explorations in String Theory Lecture 3

Pedro Vieira Perimeter Institute for Theoretical Physics

April 10, 2013

PIRSA:13040086

High Energy Physics
12/13 PSI - Explorations in Cosmology Lecture 3

Matthew Johnson York University

April 10, 2013

PIRSA:13040064

Astrophysics
Advanced General Relativity - Lecture 23

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 09, 2013

PIRSA:13040008
An infalling observer in AdS/CFT and the black hole information paradox

Kyriakos Papadodimas European Organization for Nuclear Research (CERN)

April 09, 2013

PIRSA:13040118

High Energy Physics
12/13 PSI - Explorations in String Theory Lecture 2

Pedro Vieira Perimeter Institute for Theoretical Physics

April 09, 2013

PIRSA:13040085

High Energy Physics
The Death Throes of Massive Stars: Supernovae, Black Holes, and Neutrinos

Evan O'Connor California Institute of Technology

April 09, 2013

PIRSA:13040120

Astrophysics

The endgame of massive star evolution is the gravitational-induced collapse of the central inert iron core. The collapse of the core continues until the matter reaches nuclear densities where the strong force between nucleons becomes dominant and provides sufficient pressure to stabilize the newly formed protoneutron star. What ensues is a complex multi-physics problem involving strong gravity, multidimensional hydrodynamic instabilities, magnetic fields, multispecies neutrino radiation, and supranuclear density physics to name a few.

We expect that most massive stars end this final stage of stellar evolution with a successful core-collapse supernova explosion. However, we also know that some of these core collapse events must fail and form stellar mass black holes.In his talk I will touch on two of the most important questions in core-collapse supernovae theory. I will briefly talk about what conditions are favourable for failed core-collapse supernovae (i.e. black hole formation). Conversely, I will discuss recent results from full three-dimensional, general-relativistic simulations of core-collapse and the implications for our understanding of the core-collapse supernova mechanism. If time permits, I'll discuss how neutrinos from the next galactic core-collapse supernova can help constrain properties of massive stars.
12/13 PSI - Explorations in Cosmology Lecture 2

Matthew Johnson York University

April 09, 2013

PIRSA:13040063

Astrophysics
Classical and quantum circuit obfuscation with braids

Stephen Jordan National Institute of Standards & Technology

April 08, 2013

PIRSA:13040111

Quantum Physics

A circuit obfuscator is an algorithm that translates logic circuits into functionally-equivalent similarly-sized logic circuits that are hard to understand. While ad hoc obfuscators have been implemented, theoretical progress has mainly been limited to no-go results. In this work, we propose a new notion of circuit obfuscation, which we call partial indistinguishability. We then prove that, in contrast to previous definitions of obfuscation, partial indistinguishability obfuscation can be achieved by a polynomial-time algorithm. Specifically, our algorithm re-compiles the given circuit using a gate that satisfies the relations of the braid group, and then reduces to a braid normal form. Variants of our obfuscation algorithm can be applied to both classical and quantum circuits.

Title	Date	Collection	Type	Info
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
12/13 PSI - Explorations in Cosmology Lecture 4	2013‑04‑11	12/13 PSI - Explorations in Cosmology	Course	View details
Topological insulator of bosons in 3d via dyon condensation and the statistical Witten effect.	2013‑04‑10	Quantum Matter	Scientific Series	View details
12/13 PSI - Explorations in String Theory Lecture 3	2013‑04‑10	12/13 PSI - Eplorations in String Theory	Course	View details
12/13 PSI - Explorations in Cosmology Lecture 3	2013‑04‑10	12/13 PSI - Explorations in Cosmology	Course	View details
Advanced General Relativity - Lecture 23	2013‑04‑09	Elements of General Relativity	Course	View details
An infalling observer in AdS/CFT and the black hole information paradox	2013‑04‑09	Quantum Fields and Strings	Scientific Series	View details
12/13 PSI - Explorations in String Theory Lecture 2	2013‑04‑09	12/13 PSI - Eplorations in String Theory	Course	View details
The Death Throes of Massive Stars: Supernovae, Black Holes, and Neutrinos	2013‑04‑09	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - Explorations in Cosmology Lecture 2	2013‑04‑09	12/13 PSI - Explorations in Cosmology	Course	View details
Classical and quantum circuit obfuscation with braids	2013‑04‑08	Perimeter Institute Quantum Discussions	Scientific Series	View details

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Format results

12/13 PSI - Explorations in String Theory Lecture 4

Large Scale Bayesian Inference in Cosmology

12/13 PSI - Explorations in Cosmology Lecture 4

Topological insulator of bosons in 3d via dyon condensation and the statistical Witten effect.

12/13 PSI - Explorations in String Theory Lecture 3

12/13 PSI - Explorations in Cosmology Lecture 3

Advanced General Relativity - Lecture 23

An infalling observer in AdS/CFT and the black hole information paradox

12/13 PSI - Explorations in String Theory Lecture 2

The Death Throes of Massive Stars: Supernovae, Black Holes, and Neutrinos

12/13 PSI - Explorations in Cosmology Lecture 2

Classical and quantum circuit obfuscation with braids

12/13 PSI - Explorations in String Theory Lecture 4

Large Scale Bayesian Inference in Cosmology

12/13 PSI - Explorations in Cosmology Lecture 4

Topological insulator of bosons in 3d via dyon condensation and the statistical Witten effect.

12/13 PSI - Explorations in String Theory Lecture 3

12/13 PSI - Explorations in Cosmology Lecture 3

Advanced General Relativity - Lecture 23

An infalling observer in AdS/CFT and the black hole information paradox

12/13 PSI - Explorations in String Theory Lecture 2

The Death Throes of Massive Stars: Supernovae, Black Holes, and Neutrinos

12/13 PSI - Explorations in Cosmology Lecture 2

Classical and quantum circuit obfuscation with braids