The concept of space-time makes Star Trek-style warp drives theoretically possible, and researchers have proposed a way of detecting their use.
https://www.wired.com/story/alien-spaceships-could-be-detected-using-gravitational-waves/?utm_source=dlvr.it&utm_medium=blogger
https://www.wired.com/story/alien-spaceships-could-be-detected-using-gravitational-waves/?utm_source=dlvr.it&utm_medium=blogger