I have in mind a way to enable FTL travel. Is this way viable?
In the paper: "Weighing the vacuum with the Archimedes experiment"
we can see the dependency of the gravitational repulsion exerted by Casimir Vacuum on the energy between the plates. The force goes as E / c^2.
we can observe that negative energy between the plates can be arbitrarily low if a B field sufficiently strong is provided. Moreover when the B field diverges the total energy (field energy + Casimir vacuum energy) goes to minus infinite. (see equations 85, 106, 107 for the Casimir vacuum energy) So this implies that, if a B field sufficiently strong is provided, we can have an arbitrarily strong repulsive gravitational force: it is exactly what we need in order to make FTL travel possible.
To understand why, read the following: fact is that, when negative mass is involved, the Shapiro effect changes sign so, instead of a Shapiro delay, you'll have a Shapiro 'early arrival'. So, in presence of a negative gravitational mass, light (and ultra relativistic particles or spaceships) cover the distance between A and B in a time shorter than d(A,B)/c0. Where d(. , .) is the ordinary euclidean distance. For the same reason, in presence of a positive gravitational mass, light (and ultra relativistic particles) cover the distance between A and B in a time higher than d(A,B)/c0.
The aforementioned idea is not new but was presented in