Talks

12709 - 12720 of 20118 Results

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 and Technology

April 08, 2013

PIRSA:13040111

Quantum Physics
12/13 PSI - Explorations in String Theory Lecture 1

Pedro Vieira Perimeter Institute for Theoretical Physics

April 08, 2013

PIRSA:13040084

High Energy Physics
12/13 PSI - Explorations in Cosmology Lecture 1

Matthew Johnson York University

April 08, 2013

PIRSA:13040062

Astrophysics
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles

April 05, 2013

PIRSA:13040031

High Energy Physics

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 and 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.
12/13 PSI - Explorations in String Theory Lecture 1

Pedro Vieira Perimeter Institute for Theoretical Physics

April 08, 2013

PIRSA:13040084

High Energy Physics
12/13 PSI - Explorations in Cosmology Lecture 1

Matthew Johnson York University

April 08, 2013

PIRSA:13040062

Astrophysics
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles

April 05, 2013

PIRSA:13040031

High Energy Physics

Two-dimensional models provide for a very attractive playground being a theory imitating some of the main features of QCD. Those include the asymptotic freedom, mass gap, confinement, chiral symmetry breaking and others. Furthermore, there is a correspondence between the spectra of four-dimensional SQCD and N=(2,2) CP(N-1) sigma model which was discovered more than a decade ago. This correspondence was explained later when it was found that SQCD supports non-Abelian strings with confined monopoles. The kinks of the two-dimensional theory are the monopoles attached to the strings. Thus, analysis of two-dimensional sigma models gives a deeper insight into the four-dimensional SQCD, in particular, into its strong dynamics.

We study the BPS spectrum of the N=(2,2) CP(N-1) model with the Z_N-symmetric twisted mass terms. We focus on analysis of the "extra'' towers of states found previously and compare them to the states that can be identified in the quasiclassical domain. Exact analysis of the strong-coupling states shows that not all of them survive when passing to the weak-coupling domain. Some of the states decay on the curves of the marginal stability (CMS). Thus, most of the strong coupling states do not exist at weak coupling and cannot be classified quasiclassically. This result lifts to four dimensions. In terms of the four-dimensional theory, the "extra" states are the strong coupling dyons, while the quasiclassical bound states are the bound states of dyons and quarks.

Title	Date	Collection	Type	Info
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
12/13 PSI - Explorations in String Theory Lecture 1	2013‑04‑08	12/13 PSI - Eplorations in String Theory	Course	View details
12/13 PSI - Explorations in Cosmology Lecture 1	2013‑04‑08	12/13 PSI - Explorations in Cosmology	Course	View details
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles	2013‑04‑05	Quantum Fields and Strings	Scientific Series	View details

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Format results

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 1

12/13 PSI - Explorations in Cosmology Lecture 1

2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles

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 1

12/13 PSI - Explorations in Cosmology Lecture 1

2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles