Proof that energy can be converted to matter means pure energy can manipulate spacetime

Gravitational waves can be created using short pulse lasers (attosecond/femtosecond/petawatt)

Macroscopic quantum tunneling won the Nobel Prize

The Breit-Wheeler process validates Einstein's E=mc² equivalence principle

General relativity mathematically allows warp drives and wormholes

While you cannot move through spacetime faster than light, spacetime itself can move faster than light

Negative energy is created by disturbing/squeezing the spacetime medium, not by exotic matter