Talks

10933 - 10944 of 16889 Results

Quantum Field Theory - Lecture 10A

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 22, 2012

PIRSA:12100017

Quantum Fields and Strings
Self-localization of a single hole in Mott antiferromagnets

Zheng-Yu Weng Tsinghua University

October 19, 2012

PIRSA:12100077

Condensed Matter
Condensed Matter - Lecture 9

Assa Auerbach Technion – Israel Institute of Technology

October 19, 2012

PIRSA:12100032

Condensed Matter
Quantum Field Theory - Lecture 9B

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 19, 2012

PIRSA:12100070

Quantum Fields and Strings
Quantum Field Theory - Lecture 9A

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 19, 2012

PIRSA:12100014

Quantum Fields and Strings
Understanding black hole entropy through the renormalization group

Alejandro Satz

October 18, 2012

PIRSA:12100053
Towards an Asymptotically AdS Description of Heavy Ion Collisions

Hans Bantilan Princeton University

October 18, 2012

PIRSA:12100076

Quantum Fields and Strings
Condensed Matter - Lecture 8

Assa Auerbach Technion – Israel Institute of Technology

October 18, 2012

PIRSA:12100031

Condensed Matter
Quantum Field Theory - Lecture 8B

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 18, 2012

PIRSA:12100069

Quantum Fields and Strings
Quantum Field Theory - Lecture 8A

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 18, 2012

PIRSA:12100013

Quantum Fields and Strings
Astrophysical shear-driven turbulence

Jeremy Goodman Princeton University

October 17, 2012

PIRSA:12100043
Quantum Field Theory - Lecture 7B

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 17, 2012

PIRSA:12100068

Quantum Fields and Strings

Quantum Field Theory - Lecture 10A

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 22, 2012

PIRSA:12100017

Quantum Fields and Strings
Self-localization of a single hole in Mott antiferromagnets

Zheng-Yu Weng Tsinghua University

October 19, 2012

PIRSA:12100077

Condensed Matter

Anderson localization - quantum suppression of carrier diffusion due to disorders - is a basic notion of modern condensed matter physics. Here I will talk about a novel localization phenomenon totally contrary to this common wisdom. Strikingly, it is purely of strong interaction origin and occurs without the assistance of disorders. Specifically, by combined numerical (density matrix renormalization group) method and analytic analysis, we show that a single hole injected in a quantum antiferromagnetic ladder is generally self-localized even though the system respects the translational symmetry. The localization length is found to monotonically decrease with the increase of leg number, indicating stronger self-localization in the two-dimensional limit. We find that a peculiar coupling between the doped charge and the quantum spin background causes quantum interference among different hole paths. The latter brings the hole's itinerant motion to a halt, a phenomenological analogy to Anderson localization. Our findings are opposite to the common belief of the quasiparticle picture for the doped hole and unveil a completely new paradigm for lightly doped Mott insulators.
Condensed Matter - Lecture 9

Assa Auerbach Technion – Israel Institute of Technology

October 19, 2012

PIRSA:12100032

Condensed Matter
Quantum Field Theory - Lecture 9B

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 19, 2012

PIRSA:12100070

Quantum Fields and Strings
Quantum Field Theory - Lecture 9A

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 19, 2012

PIRSA:12100014

Quantum Fields and Strings
Understanding black hole entropy through the renormalization group

Alejandro Satz

October 18, 2012

PIRSA:12100053

It is known that the entanglement entropy of quantum fields on the black hole background contributes to the Bekenstein-Hawking entropy,and that its divergences can be absorbed into the renormalization of gravitational couplings. By introducing a Wilsonian cutoff scale and the concepts of the renormalization group, we can expand this observation into a broader framework for understanding black hole entropy. At a given RG scale, two contributions to the black hole entropy can be identified: the "gravitational" contribution coming from the running effective gravitational action, and the entanglement entropy of the quantum degrees of freedom below the cutoff scale. At different RG scales the balance is different, though the total black hole entropy is invariant. I will describe this picture for free fields, considering both minimal and non-mininal coupling, and discuss the extension to interacting fields and the difficulties it raises.
Towards an Asymptotically AdS Description of Heavy Ion Collisions

Hans Bantilan Princeton University

October 18, 2012

PIRSA:12100076

Quantum Fields and Strings

I will discuss recent work in simulating asymptotically anti-de Sitter spacetimes, and its relation to heavy ion collider physics. For this purpose, I intend to focus on a class of oblately deformed black hole spacetime solutions. For each of these solutions, I will map the gravitational metric in the spacetime bulk to a stress tensor one-point function of the conformal field theory defined on the spacetime boundary. During the ring-down process, wherein the deformed black hole settles down to the AdS analog of the Schwarzschild solution, I will exhibit evidence that the dual CFT stress tensor on the boundary is that of an N=4 SYM fluid, even for black holes of significant deformation well outside the perturbative regime. We will conformally map the boundary fluid onto a real-world fluid in Minkowski space, and discover a temperature profile which can be thought of as approximating that of a head-on heavy ion collision at its moment of impact. I will close with a description of recent parallel explorations.
Condensed Matter - Lecture 8

Assa Auerbach Technion – Israel Institute of Technology

October 18, 2012

PIRSA:12100031

Condensed Matter
Quantum Field Theory - Lecture 8B

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 18, 2012

PIRSA:12100069

Quantum Fields and Strings
Quantum Field Theory - Lecture 8A

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 18, 2012

PIRSA:12100013

Quantum Fields and Strings
Astrophysical shear-driven turbulence

Jeremy Goodman Princeton University

October 17, 2012

PIRSA:12100043

Astronomical hydrodynamics is usually almost ideal in the sense that the Reynolds number (Re) is enormous and any effective viscosity must be due to shocks or turbulence. Astronomical magnetohydrodynamics (MHD) is often also nearly ideal, so that magnetic fields and plasma are well coupled. In particular, dissipation of orbital energy in accretion disks around black holes is readily explained by MHD turbulence. On the other hand, the planet-bearing disks around protostars are magnetically far from ideal because of very low fractional ionization. MHD turbulence is at best marginal in these disks, yet accretion is observed. The Reynolds numbers based on orbital-velocity gradients are enormous, so by analogy with high-Re terrestrial flows, one might expect hydrodynamic (i.e., unmagnetized) turbulence. Direct numerical simulations indicate that such turbulence is somehow suppressed by keplerian rotation, though the mechanism is
unclear and the simulations are limited in Re. Recently, a few groups have studied the question via Taylor-Couette experiments at somewhat higher Re, obtaining conflicting results. Complicating and enriching this debate is the recent discovery that turbulence tends to have a finite lifetime in shear flows that admit a formally linearly stable laminar solution: this includes flow in smooth pipes and probably also unmagnetized keplerian disks. Some suggestions will be offered as to how these open questions might be resolved.
Quantum Field Theory - Lecture 7B

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 17, 2012

PIRSA:12100068

Quantum Fields and Strings

Title	Date	Collection	Type	Info
Quantum Field Theory - Lecture 10A	2012‑10‑22	12/13 PSI - Quantum Field Theory 1	Course	View details
Self-localization of a single hole in Mott antiferromagnets	2012‑10‑19	Quantum Matter	Scientific Series	View details
Condensed Matter - Lecture 9	2012‑10‑19	12/13 PSI - Condensed Matter	Course	View details
Quantum Field Theory - Lecture 9B	2012‑10‑19	12/13 PSI - Quantum Field Theory 1	Course	View details
Quantum Field Theory - Lecture 9A	2012‑10‑19	12/13 PSI - Quantum Field Theory 1	Course	View details
Understanding black hole entropy through the renormalization group	2012‑10‑18	Quantum Gravity	Scientific Series	View details
Towards an Asymptotically AdS Description of Heavy Ion Collisions	2012‑10‑18	Strong Gravity	Scientific Series	View details
Condensed Matter - Lecture 8	2012‑10‑18	12/13 PSI - Condensed Matter	Course	View details
Quantum Field Theory - Lecture 8B	2012‑10‑18	12/13 PSI - Quantum Field Theory 1	Course	View details
Quantum Field Theory - Lecture 8A	2012‑10‑18	12/13 PSI - Quantum Field Theory 1	Course	View details
Astrophysical shear-driven turbulence	2012‑10‑17	Colloquium	Scientific Series	View details
Quantum Field Theory - Lecture 7B	2012‑10‑17	12/13 PSI - Quantum Field Theory 1	Course	View details

Format results