Talks

10693 - 10704 of 16655 Results

The cosmological constant and the emergence of the continuum

Lorenzo Sindoni Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)

October 22, 2012

PIRSA:12100081

Cosmology
An analogue model lesson for the cosmological constant

Stefano Liberati SISSA International School for Advanced Studies

October 22, 2012

PIRSA:12100080

Cosmology
Improved test of the Equivalence Principle as a probe of quantum gravity

James Overduin Towson University

Daniel Sudarsky Universidad Nacional Autónoma De Mexico (UNAM)

October 22, 2012

PIRSA:12100127

Quantum Gravity
Quantum Field Theory - Lecture 10B

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 22, 2012

PIRSA:12100071

Quantum Fields and Strings
Condensed Matter - Lecture 10

Assa Auerbach Technion – Israel Institute of Technology

October 22, 2012

PIRSA:12100035

Condensed Matter
Matter-wave clocks

Holger Mueller University of California, Berkeley

October 22, 2012

PIRSA:12100124

Quantum Gravity
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

The cosmological constant and the emergence of the continuum

Lorenzo Sindoni Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)

October 22, 2012

PIRSA:12100081

Cosmology

Naturalness problems that could be signaling the necessity a completion of an effective field theory with the introduction of an otherwise overlooked ingredient. The cosmological constant problem can be seen as a signal that the EFT for gravity, general relativity, is not correctly including the gravitational properties of the vacuum. Starting from the discussion of the a possible solution to this naturalness problem for a cc-like term in a BEC analogue model, I will briefly discuss how this particular mechanism can be extended, albeit in a preliminary form, to more genuine quantum gravity models like GFT, connecting in particular the problem of the determination of the gravitational couplings (and hence the hierarchies involved) to the appearance of a semiclassical space-time
An analogue model lesson for the cosmological constant

Stefano Liberati SISSA International School for Advanced Studies

October 22, 2012

PIRSA:12100080

Cosmology

Analogue models of gravity have been a test field for many phenomena in quantum field theory on curved spacetimes. It was recently recognized that in some situations they can also provide toy models of emergent gravity. We shall review here such a model and address within it the nature and scale of the cosmological constrant trying to draw general lessons for emergent gravity scenarios.
Improved test of the Equivalence Principle as a probe of quantum gravity

James Overduin Towson University

Daniel Sudarsky Universidad Nacional Autónoma De Mexico (UNAM)

October 22, 2012

PIRSA:12100127

Quantum Gravity

Current approaches to the problems of dark energy and unification generically predict the existence of new fields (quintessence dilatons etc.) that will in principle couple with different strengths to different standard-model fields. These different coupling strengths will cause test materials of different compositions to fall at different rates in the same gravitational field violating the Equivalence Principle the foundation of General Relativity. A sufficiently sensitive measurement of the relative accelerations of different test bodies in orbit around the earth could detect or rule out these new fields complementing existing or proposed experiments in high-energy physics (colliders) and observational cosmology (space telescopes). To do this convincingly such an experiment needs at least three test materials spanning the largest possible volume in the space of atomic and molecular properties and a sensitivity to EP violations of as little as a part in $10^{18}$ (attainable only in space and at low temperatures). I discuss one such experiment the Satellite Test of the Equivalence Principle which has reached an advanced stage of prototype development and is currently awaiting a path toward a flight program.
Quantum Field Theory - Lecture 10B

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 22, 2012

PIRSA:12100071

Quantum Fields and Strings
Condensed Matter - Lecture 10

Assa Auerbach Technion – Israel Institute of Technology

October 22, 2012

PIRSA:12100035

Condensed Matter
Matter-wave clocks

Holger Mueller University of California, Berkeley

October 22, 2012

PIRSA:12100124

Quantum Gravity
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.

Title	Date	Collection	Type	Info
The cosmological constant and the emergence of the continuum	2012‑10‑22	Experimental Search for Quantum Gravity 2007	Conference	View details
An analogue model lesson for the cosmological constant	2012‑10‑22	Experimental Search for Quantum Gravity 2007	Conference	View details
Improved test of the Equivalence Principle as a probe of quantum gravity	2012‑10‑22	Experimental Search for Quantum Gravity 2012	Conference	View details
Quantum Field Theory - Lecture 10B	2012‑10‑22	12/13 PSI - Quantum Field Theory 1	Course	View details
Condensed Matter - Lecture 10	2012‑10‑22	12/13 PSI - Condensed Matter	Course	View details
Matter-wave clocks	2012‑10‑22	Experimental Search for Quantum Gravity 2012	Conference	View details
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

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