PIRSA Logo


PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: Philip Mannheim


PIRSA:12070015  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Making the Case for Conformal Gravity
Speaker(s): Philip Mannheim
Abstract: We discuss the shortcomings of Einstein gravity at both the classical and quantum levels. We discuss the motivation for replacing Einstein gravity by conformal gravity. We show how the conformal gravity theory is able to naturally solve the quantum gravity problem, the vacuum zero-point energy probl... read more
Date: 26/07/2012 - 11:00 am

PIRSA:08110037  ( MP4 Medium Res , MP3 , PDF ) Which Format?
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

PIRSA:08060063  ( MP4 Medium Res , MP3 , PDF ) Which Format?
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

PIRSA:05110020  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Dark matter and dark energy - Fact or fiction?
Speaker(s): Philip Mannheim
Abstract: We show that the origin of the dark matter and dark energy problems originates in the assumption of standard Einstein gravity that Newton's constant is fundamental. We discuss an alternate, conformal invariant, metric theory of gravity in which Newton's constant is induced dynamically, with the glob... read more
Date: 23/11/2005 - 2:00 pm
Series: Colloquium
Valid XHTML 1.0!