Talks

10093 - 10104 of 16890 Results

Some simple extensions of Mathieu Moonshine

Shamit Kachru Stanford University

October 21, 2013

PIRSA:13100112
Topics in QFT on Flat and Curved Spacetimes - Lecture 9

Ugo Moschella University of Insubria

October 21, 2013

PIRSA:13100013
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle

Richard Hill University of Kentucky

October 18, 2013

PIRSA:13100107

Particle Physics
All AdS7 solutions of type II supergravity

Alessandro Tomasiello University of Milano-Bicocca

October 18, 2013

PIRSA:13100108

Quantum Fields and Strings
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

Quantum Fields and Strings
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

Quantum Gravity
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

Strong Gravity
13/14 PSI - Statistical Mechanics - Lecture 8

Anton Burkov University of Waterloo

October 17, 2013

PIRSA:13100054

Some simple extensions of Mathieu Moonshine

Shamit Kachru Stanford University

October 21, 2013

PIRSA:13100112

Mathieu Moonshine is a striking and unexpected relationship between the sporadic simple finite group M24 and a special Jacobi form, the elliptic genus, which arises naturally in studies of nonlinear sigma models with K3 target. In this talk, we first discuss its predecessor (Monstrous Moonshine), then discuss the current evidence in favor of Mathieu Moonshine. We also discuss extensions of this story involving `second quantized mirror symmetry,' relating heterotic strings on K3 to type II strings on Calabi-Yau threefolds.
Topics in QFT on Flat and Curved Spacetimes - Lecture 9

Ugo Moschella University of Insubria

October 21, 2013

PIRSA:13100013
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle

Richard Hill University of Kentucky

October 18, 2013

PIRSA:13100107

Particle Physics

Heavy particle expansions, familiar from heavy quark physics, have found important applications in the analysis of dark matter candidates and their interactions with the Standard Model. From a different direction, precision spectroscopy of muonic hydrogen has challenged QED and required more precise knowledge of proton structure. These problems have forced a closer examination of the construction of general heavy particle lagrangians at high orders in the 1/M expansion, and in the absence of known ultraviolet completions. Key aspects of this formalism, including the emergence of Lorentz invariance from "nonrelativistic" lagrangians, are reviewed, and several applications are presented. A status report on the proton radius puzzle is given.
All AdS7 solutions of type II supergravity

Alessandro Tomasiello University of Milano-Bicocca

October 18, 2013

PIRSA:13100108

Quantum Fields and Strings

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

Quantum Fields and Strings

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

Quantum Gravity

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

Strong Gravity

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

Title	Date	Collection	Type	Info
Some simple extensions of Mathieu Moonshine	2013‑10‑21	Physics Around Mirror Symmetry	Conference	View details
Topics in QFT on Flat and Curved Spacetimes - Lecture 9	2013‑10‑21	Topics in QFT on Flat and Curved Spacetimes	Course	View details
Heavy particle effective field theory: formalism, dark matter and the proton size puzzle	2013‑10‑18	Particle Physics	Scientific Series	View details
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

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