Looping back to the past through free fall in a controlled warp drive spacetime
Phys. Rev. D 111, 124029 – Published 18 June, 2025
DOI: https://doi.org/10.1103/1gmk-3zdq
Abstract
We present a modification to a “rotating” version of the dynamical Alcubierre spacetime, which was previously shown to permit closed timelike curves (CTCs). 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.
