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Facta universitatis - series Physics Chemistry and Technology

On the concept of local time

J. Jeknić-Dugić, M. Dugić, M. Arsenijević

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We briefly review the conceptual basis of the recently introduced novel concept of the so-called Local Time in quantum theory. An emphasis is placed on certain cosmological aspects.
DOI
10.2298/fupct1901053j

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The history of the particle concept is briefly reviewed, with particular emphasis on the `foliation dependence' of many particle creation models, and the possible connection between our notion of particle and our notion of simultaneity. It is argued that the concept of `radar time' (originally introduced by Sir Hermann Bondi in his work on k-calculus) provides a satisfactory concept of `simultaneity' for observers in curved spacetimes. This is used to propose an observer-dependent particle interpretation, applicable to an arbitrary observer, depending solely on that observers motion and not on a choice of coordinates or gauge. This definition is illustrated with application to non-inertial observers and simple cosmologies, demonstrating its generality and its consistency with known cases.
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