PIRSA:C19049 - Indefinite Causal StructurePODCAST Subscribe to podcast

Indefinite Causal Structure

Organizer(s): Lucien Hardy   Robert Mann  

Collection URL: http://pirsa.org/C19049

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PIRSA:19120029  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Date: 10/12/2019 - 2:00 pm

PIRSA:19120030  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Unscrambling the Omelette of Causation and Inference in Operational and Ontological Theories
Speaker(s): David Schmid
Abstract: I will discuss how the standard frameworks for operational theories involve a scrambling of causal and inferential concepts. I will then present a new framework for operational theories which separates out the inferential and the causal aspects of a given physical theory. Generalized probabilistic t... read more
Date: 10/12/2019 - 2:50 pm

PIRSA:19120031  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Discussion Session 1
Date: 10/12/2019 - 4:00 pm

PIRSA:19120036  ( MP4 Medium Res , PDF ) Which Format?
Lessons from the role of non-relativistic causal models in the history of QFT?
Speaker(s): Doreen Fraser
Abstract: There are a number of cases in the history of particle physics in which analogies to non-relativistic condensed matter physics models guided the development of new relativistic particle physics models. This heuristic strategy for model construction depended for its success on the causal structure of... read more
Date: 11/12/2019 - 9:00 am

PIRSA:19120037  ( MP4 Medium Res , PDF ) Which Format?
Dueling Arrows of Causality, Causal Uncertainty and Quadratic Gravity
Speaker(s): John Donoghue
Abstract: Quadratic gravity is a renormalizeable theory of quantum gravity which is unitary, but which violates causality by amounts proportional to the inverse Planck scale. To understand this, I will first discuss the arrow of causality in quantum field theory (with a detour concerning the arrow of time), a... read more
Date: 11/12/2019 - 9:50 am

PIRSA:19120038  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Two views of relative locality
Speaker(s): Lee Smolin
Abstract: Relative locality is a quantum gravity phenomenon in which whether an event is local or not-and the degree of non-locality-is dependent on the position and motion of the observer, as well as on the energy of the observer’s probes. It was first discovered and studied, beginning in 2010, in a limi... read more
Date: 11/12/2019 - 11:20 am

PIRSA:19120039  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Speaker(s): Lucien Hardy
Date: 11/12/2019 - 4:00 pm

PIRSA:19120042  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Quantum Models of CTCs and a space-based experiment
Speaker(s): Tim Ralph
Abstract: I will discuss various models of how quantum systems might interact with Closed Time-like Curves and some of the curious effects that can arise. I will then use this to motivate a speculative gravitational decoherence model and describe a recent space-based experiment which made the first test of su... read more
Date: 12/12/2019 - 9:00 am

PIRSA:19120043  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Time reference frames and gravitating quantum clocks
Abstract: The standard formulation of quantum theory relies on a fixed space-time metric determining the localisation and causal order of events. In general relativity, the metric is influenced by matter, and it is expected to become indefinite when matter behaves quantum mechanically. Here we explore the pro... read more
Date: 12/12/2019 - 9:50 am

PIRSA:19120040  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Speaker(s): Robert Mann
Date: 12/12/2019 - 11:20 am

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