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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: James Hartle


PIRSA:17110122  ( MP4 Medium Res , MP3 , PDF ) Which Format?
What is a No-Boundary Quantum State?
Speaker(s): James Hartle
Abstract: Contemporary final theories consist of a theory of the universe’s dynamics (I) like the avatars of string theory together with a theory of its quantum state (Ψ) like the no-boundary wave function of the universe (NBWF). This talk is concerned with the definition of a no-boundary quantum state at... read more
Date: 14/11/2017 - 11:35 am

PIRSA:17110089  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Classical Spacetime and Quantum Black Holes
Speaker(s): James Hartle
Abstract: A quantum system behaves classically when quantum probabilities are high for coarse-grained histories correlated in time by deterministic laws. That is as true for the flight of a tennis ball as for the behavior of spacetime geometry in gravitational collapse. Classical spacetime may be available on... read more
Date: 09/11/2017 - 3:30 pm

PIRSA:11070015  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Eternal Inflation in the Light of Quantum Cosmology
Speaker(s): James Hartle
Abstract: If the universe is a quantum mechanical system it has a quantum state. This state supplies a probabilistic measure for alternative histories of the universe. During eternal inflation these histories typically develop large inhomogeneities that lead to a mosaic structure on superhorizon scales consi... read more
Date: 13/07/2011 - 9:00 am

PIRSA:11030103  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Eternal Inflation in the Light of Quantum Cosmology
Speaker(s): James Hartle
Abstract: If the universe is a quantum mechanical system it has a quantum state. This state supplies a probabilistic measure for alternative histories of the universe. During eternal inflation these histories typically develop large inhomogeneities that lead to a mosaic structure on superhorizon scales consis... read more
Date: 08/03/2011 - 2:00 pm

PIRSA:11020124  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Quantum Mechanics with Extended Probabilities
Speaker(s): James Hartle
Abstract: We present a new formulation of quantum mechanics for closed systems like the universe using an extension of familiar probability theory that incorporates negative probabilities. Probabilities must be positive for alternative histories that are the basis of settleable bets. However, quantum mechanic... read more
Date: 07/03/2011 - 11:00 am

PIRSA:08090044  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Science in a Very Large Universe ; The Classical Multiverse of the No-Boundary Quantum State
Speaker(s): James Hartle
Abstract:
Date: 02/09/2008 - 10:30 am

PIRSA:07090064  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Quasiclassical Realms and Copenhagen Quantum Theory in a Quantum Universe
Speaker(s): James Hartle
Abstract: One of the most remarkable features of our quantum universe is the wide range of time, place, scale, and epoch on which the deterministic laws of classical physics apply to an excellent approximation. This talk reviews the origin of such a quasiclassical realm in a universe governed fundamentally by... read more
Date: 22/09/2007 - 2:50 pm

PIRSA:06040018  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Generalizing Quantum Mechanics for Quantum Spacetime
Speaker(s): James Hartle
Abstract: Familiar textbook quantum mechanics assumes a fixed background spacetime to define states on spacelike surfaces and their unitary evolution between them. Quantum theory has been generalized as our conceptions of space and time have evolved. But quantum mechanics needs to be generalized further for q... read more
Date: 19/04/2006 - 2:00 pm
Series: Colloquium

PIRSA:04100004  ( MP4 Medium Res , MP3 , PDF ) Which Format?
James Hartle - Einstein's Vision and the Quantum Universe.
Speaker(s): James Hartle
Abstract: Einstein's Vision and the Quantum Universe.
Date: 02/10/2004 - 3:00 pm
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