PIRSA:C07008 - Excursions in the Dark Workshop - 2007PODCAST Subscribe to podcast

Excursions in the Dark Workshop

Organizer(s): Justin Khoury  

Collection URL: http://pirsa.org/C07008

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PIRSA:07050039  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Gravity Probes and Graviton Hair
Speaker(s): Georgi Dvali
Date: 20/05/2007 - 9:00 am

PIRSA:07050040  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The DGP Braneworld
Speaker(s): Kazuya Koyama
Abstract: In this talk, I summarize a current status of the DGP braneworld emphasizing the theoretical consistency of the model.First I review the behaviour of the linearized gravity and show the existence of the ghost. Then I discuss the issue of the non-linearity of gravity in this model.
Date: 20/05/2007 - 11:00 am

PIRSA:07050041  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Consistent Lorentz Violation in Flat and Curved Space
Speaker(s): Oriol Pujolas
Abstract: Motivated by the severity of the bounds on Lorentz violation in the presence of ordinary gravity, we study frameworks in which Lorentz violation does not affect the spacetime geometry. We show that there are at least two inequivalent classes of spontaneous Lorentz breaking that even in the presence ... read more
Date: 20/05/2007 - 11:30 am

PIRSA:07050042  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Dark Energy, Lorentz Violation and Ghosts
Speaker(s): Raman Sundrum
Abstract: I describe how vacuum energy can be controlled by a symmetry principle that necessitates a ghost sector. I argue that the implied instability of Minkowski spacetime is natural and consistent with experience if gravity is fundamentally Lorentz-violating, and describe attempts to construct such exotic... read more
Date: 20/05/2007 - 2:00 pm

PIRSA:07050043  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Random Observations in the Landscape
Speaker(s): Vitaly Vanchurin
Date: 20/05/2007 - 3:00 pm

PIRSA:07050044  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Why there is something rather than nothing
Speaker(s): Andrei Barvinski
Abstract: We show that the recently suggested Euclidean quantum gravity density matrix of the Universe which generates the set of inflationary universes is, in fact, the density matrix of the microcanonical ensemble in {em Lorentzian} quantum cosmology. This ensemble corresponds to the uniform (weight one) di... read more
Date: 20/05/2007 - 4:00 pm

PIRSA:07050045  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Modified Gravity and its Consequences for the Solar System, Astrophysics and Cosmology
Speaker(s): John Moffat
Abstract: A relativistic modified gravity (MOG) leads to a self-consistent, stable gravity theory that can describe the solar system, galaxy and clusters of galaxies data and cosmology without dark matter. A review is given of fits to galaxy rotation curves, mass profiles of X-ray clusters and weak and strong... read more
Date: 20/05/2007 - 4:30 pm

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