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Causal faster-than-light travel from a localized second time coordinate

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Author(s):
Nastase, Horatiu
Total Authors: 1
Document type: Journal article
Source: PHYSICAL REVIEW D; v. 100, n. 4, p. 11-pg., 2019-08-26.
Abstract

I present a general relativistic model with a compactified second time coordinate that a priori allows for causal, yet faster than light travel in the background of a Friedmann-Lemaistre-Robertson-Walker geometry, by local modification of a higher dimensional background geometry, specifically with respect to the radius of the compactified time coordinate. The modification can be induced via the fields of the model. I show that one cannot convert (as possible in special relativistic models, or simple general relativistic models) the superluminality into closed timelike loops violating causality, due to a novel combination of factors, at least for v(max) <= root 2. The physics of the second time is constrained by postulates derived from reasonable physical assumptions. I comment on the possibility of experimental implications of the model. (AU)

FAPESP's process: 14/18634-9 - Gauge/Gravity duality
Grantee:Victor de Oliveira Rivelles
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 16/01343-7 - ICTP South American Institute for Fundamental Research: a regional center for theoretical physics
Grantee:Nathan Jacob Berkovits
Support Opportunities: Special Projects