Linear displacement physics

Spacetime possesses a multi-phase structure - akin to states of matter - and transitions between these phases can be exploited to enable controlled movement through space, bypassing traditional constraints like relativistic limits or energy inefficiency.
Linear displacement physics locally leverages these phase shifts to pave the way for the first FTL spacefaring crafts.

N-space velocities reached thanks to linear displacement enable much faster interplanetary travel, cutting durations down from months to weeks or even days for more advanced and efficient drives - all the while keeping energetic costs to a reasonable level.