PIRSA:C08023 - The Clock and the Quantum: Time and Quantum Foundations - 2008PODCAST Subscribe to podcast

The Clock and the Quantum: Time and Quantum Foundations

Organizer(s): Lucien Hardy   Ward Struyve   Chris Fuchs   Guido Bacciagaluppi  

Collection URL: http://pirsa.org/C08023

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PIRSA:08090064  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The Theory of Duration and Clocks
Speaker(s): Julian Barbour
Abstract: In 1898, Poincaré identified two fundamental issues in the theory of time: 1)What is the basis for saying that a second today is the same as a second tomorrow? 2) How can one define simultaneity at spatially separated points? Poincaré outlined the solution to the first problem { which amounts to a... read more
Date: 28/09/2008 - 10:00 am

PIRSA:08090065  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Clocks and time in quantum theory
Speaker(s): Harvey Brown
Abstract: I will examine a number of time-related issues arising in quantum theory, and in particular attempt to address the following basic questions from a quantum perspective: 1. What is a clock? 2. Why do uniformly moving clocks dilate? 3. What is the behaviour of accelerating clocks?
Date: 28/09/2008 - 11:45 am

PIRSA:08090066  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Why Constructive Relativity Fails
Speaker(s): John Norton
Abstract: Are time and space independently existing entities? Or is their existence secondary in that they are merely properties of other, more fundamental physical systems? The parameters of this enduring debate have shifted according to the physical theory in which it are set. In the 17th century, Newton... read more
Date: 28/09/2008 - 2:00 pm

PIRSA:08090067  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The Two State Vector Formalism.
Speaker(s): Lev Vaidman
Abstract: A brief review of the Two State Vector Formalism (TSVF) will be presented. It will be argued that we need to consider also backwards evolving quantum state because information given by forwards evolving quantum states is not complete. Both past and future measurements are required for providing comp... read more
Date: 28/09/2008 - 3:00 pm

PIRSA:08090068  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Time in Bohmian Mechanics
Speaker(s): Roderich Tumulka
Abstract: My favorite version of quantum mechanics is Bohmian mechanics, a theory about particle trajectories. What is so great about it is that it removes all the mystery from quantum mechanics. I will provide a Bohmian perspective on some issues about time, including time measurements (Why is there no time ... read more
Date: 28/09/2008 - 4:30 pm

PIRSA:08090070  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Philosophical Theories of Time meet Quantum Gravity
Speaker(s): Phil Dowe
Abstract: A number of startling claims about the nature of time have made on the basis of certain theories of quantum gravity. I canvas the landscape of philosophical theories of time in order to place these claims in a rather different context of argument and counterargument. My aim is to clarify from a phil... read more
Date: 29/09/2008 - 10:00 am

PIRSA:08090071  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Thinking Inside the Box: Weakly Measuring Postselected Ensembles
Speaker(s): Aephraim Steinberg
Abstract: The presumed irreversibility of quantum measurements (whatever they are) leads, in conventional approaches to quantum theory, to an asymmetry between state preparation and post-selection. Is it possible that a trajectory can be predicted from the former, yet not inferred from the latter? Especially ... read more
Date: 29/09/2008 - 11:45 am

PIRSA:08090072  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Relational time and intrinsic decoherence.
Speaker(s): Gerard Milburn
Abstract: One approach to the problem of time in canonical quantum gravity is to use correlations between a carefully chosen physical system and all other physical systems to provide a simulacrum of time. Time emerges as an ordering of correlated measurement results. In many ways this is an echo of an idea in... read more
Date: 29/09/2008 - 2:00 pm

PIRSA:08090073  ( MP4 Medium Res , MP3 , PDF ) Which Format?
A Candidate of a Psi-Epistemic Theory
Speaker(s): Hans Westman
Abstract: In deBroglie-Bohm theory the quantum state plays the role of a guiding agent. In this seminar we will explore whether this is a universal feature shared by all hidden variable theories, or merely a peculiarity of the deBroglie-Bohm theory. We present the bare bones of a theory in which the quantum s... read more
Date: 29/09/2008 - 2:30 pm

PIRSA:08090074  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Decoherence and the (non)emergence of classicality.
Speaker(s): Steve Weinstein
Abstract: It is widely believed that the dynamical mechanism of decoherence plays a key role in understanding the emergence of classicality from quantum systems, via the environment-induced superselection of a preferred set of subsystem states, the density matrices for which are approximately diagonal in the ... read more
Date: 29/09/2008 - 3:00 pm

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