2024/07/26 by Achintya Sajeendran, Timothy C. Ralph, Sajeendran, Achintya +1
Physics and Astronomy · #83C47 (Secondary) #83C75 #83CO5 (Primary) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #gr-qc #msc:83C47 #msc:83C75 #msc:83CO5
paper · pdf · doi:10.48550/arxiv.2407.18993
11 pages, 1 figure
arxiv created 2025/03/25 · arxiv updated 2026/08/03
We present a modification to a 'rotating' version of the dynamical Alcubierre spacetime, which was previously shown to permit closed timelike curves. We find that if the effective rotation rate is made dependent on the spacetime coordinates within the bubble, a class of closed timelike curves are promoted to spatially circular geodesics. These paths provide a simple model of a free particle interacting with a CTC for a finite proper time interval, entering and exiting in flat spacetime. Despite the questionable physical realisability of our metric, we suggest that it may provide a useful background for future theoretical studies of classical and quantum models of time travel in a general relativistic setting.