Alcubierre drive
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The Alcubierre drive or Alcubierre warp drive (or Alcubierre metric, referring to metric tensor) is a speculative idea based on a solution of Einstein’s field equations in general relativity as proposed by theoretical physicist Miguel Alcubierre, by which a spacecraft could achieve faster-than-light travel if a configurable energy-density field lower than that of vacuum (that is, negative mass) could be created.
Testing shows using microwaves to propel a craft into space might work:
http://phys.org/news/2015-07-microwaves-propel-craft-space.html
That’s purely theoretical, we aren’t even sure if the science behind the proposal would work.