The Quantum Light Thruster Cont'd:

This is the basic design of the engine component after the Bose Photon Gas and Quantum Light Generator component:

 

Low entropy photons are injected into the first toroid at an extremely high density and travel at the speed of light or slightly below it in a circular path with constant acceleration.  Through the unchanging geometry, internal reflection inside the hollow reflective toroids creates a kind of optical event horizon, which both drags spacetime and dilates time in the centers.  As photons escape through strategically placed apertures feeding the next toroid's input apertures, they are blueshifted, enter another cycle of relativistic blueshift, until they exit through the last toroid's wave guides/exhaust apertures.  Time differentials with the external observational reference frame caused by the circulating high density light rings amplifies the blueshift for a second order effect independent of the internal time dilation occurring inside the toroid's "optical event horizon."  No mass enters or exits for a propellant free, mass free propulsion method.  Rather than Newtonian Mass-To-Mass Coulombic recoil to account for apparent overunity gain from the time dilation/gravitational slingshot which is created simply by steering photons to collect and circulate in an orbital path, the conservation of energy is satisfied by warping of the spacetime metric.  In this uniquely American propulsion method, we don't push against mass; we pull momentum from vacuum by compressing time.  The energy density required will invariably be from compact fusion reactors in the designs of Pais or free electron reactors which use pellets in heavy water to directly create and collect massive current instead of boiling water for steam.  This would energize the laser arrays that pump the black body diode with neodymium doped Penrose tiling which feed this toroid array with Bose Photon Gas emitted low entropy quantum light at extreme densities.  An amusing analogy or metaphor would be a "man made reverse black hole horizon," while being much tamer than the real thing. Instead of matter creating gravitational wells, we use light, and then light instead of being trapped, escapes at a higher velocity akin to a child's toy, the elastic slingshot, which breaks no laws of thermodynamics, but also uses the concept of leveraging geometric potential energy of a spacetime metric (rubber) to convert a slow energy input (drawing back the sling), to a faster kinetic energy output (releasing the sling and propelling the object in the sling (photon) forward).

 The obstacle at intuitive modulation of the spacetime metric is that humans can neither see "space," or "time."  Both are very real, but our eyesight provides only extremely limited spectra of photons bounced upon mattter in our attention.  We have been able to extrapolate the existence of the higher dimension of a spacetime fabric based on our limited perception of "big" or "small" of the same object we see, which is not trivial.  Optical size has everything to do with true spacetime fabric lengths.  Yet, without severe mentation, we could not arrive at the fact that we are embedded in a humanly imperceptible matrix, the spacetime fabric/metric, which itself is not only shapeable by matter, but also light itself, especially condensed, circulating light, which is just a few subatomic particles away from matter, but equally energetic as in the proven equivalency of E=mc^2 and E=hv.