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On the Causality and K-Causality between Measures

by Tomasz Miller 1,2
1
Faculty of Mathematics and Information Science, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warsaw, Poland
2
Copernicus Center for Interdisciplinary Studies, ul. Szczepańska 1/5, 31-011 Kraków, Poland
Academic Editors: Mariusz P. Dąbrowski, Manuel Krämer and Vincenzo Salzano
Universe 2017, 3(1), 27; https://doi.org/10.3390/universe3010027
Received: 31 January 2017 / Revised: 1 March 2017 / Accepted: 11 March 2017 / Published: 20 March 2017
(This article belongs to the Special Issue Varying Constants and Fundamental Cosmology)
Drawing from the optimal transport theory adapted to the Lorentzian setting, we propose and study the extension of the Sorkin–Woolgar causal relation K + onto the space of Borel probability measures on a given spacetime. We show that it retains its fundamental properties of transitivity and closedness. Furthermore, we list and prove several characterizations of this relation, including the “measure-theoretic” analogue of the characterization of K + in terms of time functions. View Full-Text
Keywords: causal relations; Lorentzian optimal transport theory; time functions causal relations; Lorentzian optimal transport theory; time functions
MDPI and ACS Style

Miller, T. On the Causality and K-Causality between Measures. Universe 2017, 3, 27.

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