Format results
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Welcome and Opening Remarks
Alexander Smith - Saint Anselm College , Flaminia Giacomini - ETH Zurich
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Kappa-Minkowski: physics with noncommutative time
Flavio Mercati - University of Naples Federico II
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Quantizing causation
Robert Spekkens - Perimeter Institute for Theoretical Physics
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Non-causal Page-Wootters circuits
Veronika Baumann - Austrian Academy of Sciences
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Quantum reference frames for space and space-time
Časlav Brukner - Austrian Academy of Sciences
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A New Perspective on Time Reversal Motivated by Quantum Gravity
Abhay Ashtekar - Pennsylvania State University
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Space and Time in a Lorentzian path integral
Bianca Dittrich - Perimeter Institute for Theoretical Physics
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"TIME IN QUANTUM GRAVITY - From the fundamental level to the classical limit"
Claus Kiefer - Universität zu Köln
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The emergence of quantum mechanics and space, from a fundamental, active time
Lee Smolin - Perimeter Institute for Theoretical Physics
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Welcome and Opening Remarks
Alexander Smith - Saint Anselm College , Flaminia Giacomini - ETH Zurich
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Composite quantum particles as ideal quantum clocks — operational approach to quantum aspects of time
Magdalena Zych - University of Queensland
In general relativity time requires an operational description, for example, associated with the reading of an idealised clock following some world line. I will show that in quantum physics idealised clocks can be modelled as composite quantum particles and discuss what foundational insights into… -
Kappa-Minkowski: physics with noncommutative time
Flavio Mercati - University of Naples Federico II
The kappa-Minkowski noncommutative spacetime has been studied for a long time as an example of quantum spacetime with nontrivial commutation relations between spatial and temporal coordinates which, at first sight, seem to break Poincaré invariance. However kappa-Minkowski is invariant under a Hopf… -
Quantizing causation
Robert Spekkens - Perimeter Institute for Theoretical Physics
"Spatio-temporal relations are often taken to be more primitive than causal relations. Such a relationship is assumed whenever it is suggested that it is part of the definition of a causal relation that the cause must precede the effect in time. There are good reasons, however, to take causation to… -
Non-causal Page-Wootters circuits
Veronika Baumann - Austrian Academy of Sciences
"The process matrix framework was invented to capture a phenomenon known as indefinite or quantum causal structure. Due to the generality of that framework, however, for many process matrices there is no clear physical interpretation. A popular approach towards a quantum theory of gravity is the… -
Quantum reference frames for space and space-time
Časlav Brukner - Austrian Academy of Sciences
In physics, a reference frame is an abstract coordinate system that specifies observations within that frame. While quantum states depend on the choice of reference frame, the form of physical laws is assumed to be covariant. Recently, it has been proposed to consider reference frames as physical… -
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A New Perspective on Time Reversal Motivated by Quantum Gravity
Abhay Ashtekar - Pennsylvania State University
Time Reversal T is usually discussed in the traditional framework of quantum mechanics in which T is represented by an anti-unitary operator. But quantum gravity may well need generalization of standard quantum mechanics which may not preserve even its linear structure, let alone the unitarity of… -
Space and Time in a Lorentzian path integral
Bianca Dittrich - Perimeter Institute for Theoretical Physics
I will present a quantum gravity approach based on a Lorentzian path integral for quantum geometries. The properties of quantum space time can be measured using geometric operators. This allows also to discuss fluctuations of causal structure as well as violations of (micro-) causality. I will… -
"TIME IN QUANTUM GRAVITY - From the fundamental level to the classical limit"
Claus Kiefer - Universität zu Köln
Time cannot be both absolute (as in quantum mechanics) and dynamical (as in general relativity). I present general arguments for the absence of time at the most fundamental level of quantum gravity. I discuss possible concepts that could replace it and present the recovery of standard time as an… -
The emergence of quantum mechanics and space, from a fundamental, active time
Lee Smolin - Perimeter Institute for Theoretical Physics
"We propose a realist completion of quantum mechanics, in the sense of a complete description of individual events. The proposed fundamental theory assumes that time, events, causal structure, momentum and energy are fundamental. But space and the wave function are emergent. The beables of the… -