The Time Machine Factory [unspeakable, speakable] on Time Travel -TM2019

Superpositions of causal orders in a timeless universe

25 Sept 2019, 12:10

45m

Turin

talk Investigating the fundamental properties of physics

Speaker

Prof. Vlatko Vedral (University of Oxford, ISI, National University of Singapore)

Description

I will first review the timeless Page-Wootters picture of the quantum universe in which there is no overall dynamics, but where the states of quantum fields evolve relative to the quantum states of the underlying space. I will then introduce the concept of superposing different causal orders – a notion that could be naturally motivated within some approaches to quantum gravity – and ask if and how this phenomenon could be incorporated within the Page-Wootters formalism. I hope to finish by speculating about some possible experimental implications.

Presentation materials

VEDRAL_Vlatko-Note 15 Sep 2019 Turin Talk.pdf