There has been a surge of interest in indefinite causal structure the idea that cause and effect can no longer be sharply distinguished. Motivated both by experimentation with quantum switches and quantum gravity there can be situations in which there is no matterofthefact as to what the causal structure of spacetime is. This meeting will bring together workers in Quantum Foundations and Quantum Gravity in both theoretical experimental physics to discuss the state of the art of current research and set new directions for this emerging subdiscipline.
Format results


TBA
Fabio Costa University of Queensland

Causality in Qbism
Jacques Pienaar University of Massachusetts Boston


TBA
Linqing Chen Université Libre de Bruxelles

Indefinite causal order without postselection
Katja Ried TNG Technology Consulting

TBA
Robert Mann University of Waterloo

Time reference frames and gravitating quantum clocks
Esteban Castro Ruiz Université Libre de Bruxelles (ULB)

Quantum Models of CTCs and a spacebased experiment
Tim Ralph University of Queensland

TBA
Lucien Hardy Perimeter Institute for Theoretical Physics

Two views of relative locality
Lee Smolin Perimeter Institute for Theoretical Physics

Dueling Arrows of Causality, Causal Uncertainty and Quadratic Gravity
John Donoghue University of Massachusetts Amherst