PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
 | PIRSA:08110037
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Doing physics with non-diagonalizable Hamiltonians and the solution to the ghost problem in fourth-order derivative theories Speaker(s): Philip Mannheim
Abstract: It has long been thought that theories based on equations of motion possessing derivatives of order higher than second are not unitary. Specifically, they are thought to possess unphysical ghost states with negative norm. However, it turns out that the appropriate Hilbert space for such theories had... read more
Date: 28/11/2008 - 11:00 am
Series: Cosmology & Gravitation
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 | PIRSA:08060063
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Conformal Gravity Challenges String Theory Speaker(s): Philip Mannheim
Abstract: The cosmological constant problem and the compatibility of gravity with quantum mechanics are the two most pressing problems in all of gravitational theory. While string theory nicely addresses the latter, it has so far failed to provide any compelling solution to the former. On the other hand, whil... read more
Date: 03/06/2008 - 4:45 pm
Collection: PASCOS 08
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 | PIRSA:07050029
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Embedding Quintessence in Spontaneously Broken N=1 Supergravity Speaker(s): Philippe Brax
Abstract:
Date: 18/05/2007 - 11:00 am
Collection: Excursions in the Dark Workshop
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