Topologically Massive AdS Gravity
Steve Carlip - University of California, Davis
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Cosmology with 21cm sky
Ue-Li Pen - University of Toronto , Tzu-Ching Chang - National Aeronautics and Space Administration
What will future dark energy experiments tell us?
Andreas Albrecht - University of California, Davis
No-Go Theorems for Self-Correcting Quantum Memory
Barbara Terhal - Delft University of Technology
The Clock Ambiguity and the Emergence of Physical Laws
Andreas Albrecht - University of California, Davis
Gravitational waves from cosmological sources
Xavier Siemens - Oregon State University
Reflecting magnons from D-branes
Diego Correa - University of Cambridge
Accurate and decoherence-protected adiabatic quantum computation
Daniel Lidar - University of Southern California
Decoherence and the (non)emergence of classicality.
Steve Weinstein - University of Waterloo
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…
A Candidate of a Psi-Epistemic Theory
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…
Relational time and intrinsic decoherence.
Gerard Milburn - University of Queensland
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…
Thinking Inside the Box: Weakly Measuring Postselected Ensembles
Aephraim Steinberg - University of Toronto
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…
Philosophical Theories of Time meet Quantum Gravity
Phil Dowe - University of Queensland
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…
Time in Bohmian Mechanics
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…
The Two State Vector Formalism.
Lev Vaidman - Tel Aviv University
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…
Why Constructive Relativity Fails
John Norton - University of Pittsburgh
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\'s…
Clocks and time in quantum theory
Harvey Brown - University of Oxford
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?
The Theory of Duration and Clocks
Julian Barbour - University of Oxford
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…
Astrophysics and Cosmology through Problems - 4B
Mark Wyman - PDT Partners LLC , Niayesh Afshordi - University of Waterloo
This course is aimed at advanced undergraduate and beginning graduate students, and is inspired by a book by the same title, written by Padmanabhan. Each session consists of solving one or two pre-determined problems, which is done by a randomly picked student. While the problems introduce various…