Talks

12301 - 12312 of 20120 Results

All AdS7 solutions of type II supergravity

Alessandro Tomasiello University of Milano-Bicocca

October 18, 2013

PIRSA:13100108

High Energy Physics
13/14 PSI - Statistical Mechanics - Lecture 9

Anton Burkov University of Waterloo

October 18, 2013

PIRSA:13100055
General Relativity for Cosmology - Lecture 10

Achim Kempf University of Waterloo

October 17, 2013

PIRSA:13100106
Vector Beta Function

Yu Nakayama University of California, Berkeley

October 17, 2013

PIRSA:13100082

High Energy Physics
General Relativity for Cosmology - Lecture 9

Achim Kempf University of Waterloo

October 17, 2013

PIRSA:13100008
13/14 PSI - Quantum Field Theory I - Lecture 8

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 17, 2013

PIRSA:13100030
Constructing theories from duality: my response to John Wheeler

October 17, 2013

PIRSA:13100072

General Relativity & Quantum Cosmology
Quasinormal modes of rapidly rotating black holes/ Stability of tidally perturbed neutron stars

Aaron Zimmerman The University of Texas at Austin

October 17, 2013

PIRSA:13100096

General Relativity & Quantum Cosmology
13/14 PSI - Statistical Mechanics - Lecture 8

Anton Burkov University of Waterloo

October 17, 2013

PIRSA:13100054
13/14 PSI - Quantum Field Theory I - Lecture 7

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 16, 2013

PIRSA:13100029
Simulating Hamiltonian evolution with quantum computers

Richard Cleve Institute for Quantum Computing (IQC)

October 16, 2013

PIRSA:13100097

Quantum Physics
13/14 PSI - Statistical Mechanics - Lecture 7

Anton Burkov University of Waterloo

October 16, 2013

PIRSA:13100053

All AdS7 solutions of type II supergravity

Alessandro Tomasiello University of Milano-Bicocca

October 18, 2013

PIRSA:13100108

High Energy Physics

In M-theory, the only AdS7 supersymmetric solutions are AdS7 × S4 and its orbifolds. In this talk, I will describe a classification of AdS7 supersymmetric solutions in type II supergravity. While in IIB none exist, in IIA with Romans mass (which does not lift to M-theory) there are many new ones. The classification starts from a pure spinor approach reminiscent of generalized complex geometry. Without the need for any Ansatz, the method determines uniquely the form of the metric and fluxes, up to solving a system of ODEs. Namely, the metric on M3 is that of an S2 fibered over an interval; this is consistent with the Sp(1) R-symmetry of the holographically dual (1,0) theory. One can obtain numerically many solutions, with D8 and/or D6 brane sources; topologically, the internal manifold M3 = S^3.
13/14 PSI - Statistical Mechanics - Lecture 9

Anton Burkov University of Waterloo

October 18, 2013

PIRSA:13100055
General Relativity for Cosmology - Lecture 10

Achim Kempf University of Waterloo

October 17, 2013

PIRSA:13100106
Vector Beta Function

Yu Nakayama University of California, Berkeley

October 17, 2013

PIRSA:13100082

High Energy Physics

We propose various properties of renormalization group beta functions for vector operators in relativistic quantum field theories. We argue that they must satisfy compensated gauge invariance, orthogonality with respect to scalar beta functions, Higgs-like relation among anomalous dimensions and a gradient property. We further conjecture that non-renormalization holds if and only if the vector operator is conserved. The local renormalization group analysis guarantees the first three within power counting renormalization. We verify all the conjectures in conformal perturbation theories and holography in the weakly coupled gravity regime.
General Relativity for Cosmology - Lecture 9

Achim Kempf University of Waterloo

October 17, 2013

PIRSA:13100008
13/14 PSI - Quantum Field Theory I - Lecture 8

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 17, 2013

PIRSA:13100030
Constructing theories from duality: my response to John Wheeler

October 17, 2013

PIRSA:13100072

General Relativity & Quantum Cosmology

The late physicist John Wheeler, was renowned for his Socratic method of conducting physics discussions. "Why is general relativity the way it is? What makes it special?" were reportedly questions one should expect in his presence. There are different answers to these questions, each requiring a set of assumptions - which Wheeler would likely question again - and each bringing with it new insights into physics as a whole. This talk will put forward new principles for deriving general relativity. Perhaps more than is the case with other construction principles, the principles introduced are not limited to the derivation of general relativity, requiring only an specification of the theory's phase space in order to be applicable. To be less enigmatic, one defines observable equivalence between physical theories in the Dirac constraint setting, and then the principle merely searches theory space for two equivalent (or dual) fully constrained theories. We find it quite remarkable that such a complex theory as general relativity emerges, when no initial presupposition even on the existence of space-time is made. If there is time (and I will argue there is!) I will discuss another issue that also distinguishes the present set of assumptions: the possibility that they are in a concrete sense ``self-selected", which I like to think would be more satisfactory to Wheeler's line of questioning (or at least give him more to chew on).
Quasinormal modes of rapidly rotating black holes/ Stability of tidally perturbed neutron stars

Aaron Zimmerman The University of Texas at Austin

October 17, 2013

PIRSA:13100096

General Relativity & Quantum Cosmology

I will review recent work in two very different topics. First, I will discuss the quasinormal mode spectrum of nearly extremal Kerr black holes, where a bifurcation of the frequency spectrum is observed. In addition, collective oscillations of many modes is possible, resulting in a power-law rather than exponentially decaying ringdown. Next, I will discuss a recent proposal for how tidally induced, multimode coupling of normal modes in neutron stars can destabilize the stars. Such an instability could hamper gravitational wave detection of neutron star binaries by matched filtering. By accounting for higher-order multimode couplings, it can be shown that there is no such instability for neutron star binaries, although a milder instability may exist for binaries with less compact objects.
13/14 PSI - Statistical Mechanics - Lecture 8

Anton Burkov University of Waterloo

October 17, 2013

PIRSA:13100054
13/14 PSI - Quantum Field Theory I - Lecture 7

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 16, 2013

PIRSA:13100029
Simulating Hamiltonian evolution with quantum computers

Richard Cleve Institute for Quantum Computing (IQC)

October 16, 2013

PIRSA:13100097

Quantum Physics

In 1982, Richard Feynman proposed the concept of a quantum computer as a means of simulating physical systems that evolve according to the Schrödinger equation. I will explain various quantum algorithms that have been proposed for this simulation problem, including my recent work (jointly with Dominic Berry and Rolando Somma) that significantly improves the running time as a function of the precision of the output data.
13/14 PSI - Statistical Mechanics - Lecture 7

Anton Burkov University of Waterloo

October 16, 2013

PIRSA:13100053

Title	Date	Collection	Type	Info
All AdS7 solutions of type II supergravity	2013‑10‑18	Quantum Fields and Strings	Scientific Series	View details
13/14 PSI - Statistical Mechanics - Lecture 9	2013‑10‑18	13/14 PSI - Statistical Mechanics	Course	View details
General Relativity for Cosmology - Lecture 10	2013‑10‑17	General Relativity for Cosmology - 2013	Course	View details
Vector Beta Function	2013‑10‑17	Quantum Fields and Strings	Scientific Series	View details
General Relativity for Cosmology - Lecture 9	2013‑10‑17	General Relativity for Cosmology - 2013	Course	View details
13/14 PSI - Quantum Field Theory I - Lecture 8	2013‑10‑17	13/14 PSI - Quantum Field Theory I	Course	View details
Constructing theories from duality: my response to John Wheeler	2013‑10‑17	Quantum Gravity	Scientific Series	View details
Quasinormal modes of rapidly rotating black holes/ Stability of tidally perturbed neutron stars	2013‑10‑17	Strong Gravity	Scientific Series	View details
13/14 PSI - Statistical Mechanics - Lecture 8	2013‑10‑17	13/14 PSI - Statistical Mechanics	Course	View details
13/14 PSI - Quantum Field Theory I - Lecture 7	2013‑10‑16	13/14 PSI - Quantum Field Theory I	Course	View details
Simulating Hamiltonian evolution with quantum computers	2013‑10‑16	Colloquium	Scientific Series	View details
13/14 PSI - Statistical Mechanics - Lecture 7	2013‑10‑16	13/14 PSI - Statistical Mechanics	Course	View details

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Format results

All AdS7 solutions of type II supergravity

13/14 PSI - Statistical Mechanics - Lecture 9

General Relativity for Cosmology - Lecture 10

Vector Beta Function

General Relativity for Cosmology - Lecture 9

13/14 PSI - Quantum Field Theory I - Lecture 8

Constructing theories from duality: my response to John Wheeler

Quasinormal modes of rapidly rotating black holes/ Stability of tidally perturbed neutron stars

13/14 PSI - Statistical Mechanics - Lecture 8

13/14 PSI - Quantum Field Theory I - Lecture 7

Simulating Hamiltonian evolution with quantum computers

13/14 PSI - Statistical Mechanics - Lecture 7

All AdS7 solutions of type II supergravity

13/14 PSI - Statistical Mechanics - Lecture 9

General Relativity for Cosmology - Lecture 10

Vector Beta Function

General Relativity for Cosmology - Lecture 9

13/14 PSI - Quantum Field Theory I - Lecture 8

Constructing theories from duality: my response to John Wheeler

Quasinormal modes of rapidly rotating black holes/ Stability of tidally perturbed neutron stars

13/14 PSI - Statistical Mechanics - Lecture 8

13/14 PSI - Quantum Field Theory I - Lecture 7

Simulating Hamiltonian evolution with quantum computers

13/14 PSI - Statistical Mechanics - Lecture 7