So far, the only known way to cheat the general relativistic limits on the speed of light is to form a closed sphere of metallic antimatter that is freezed down to a temperature where it turns superconductive. This sphere, or bubble, and everything inside it is temporarily transported to the heterogenic space. This dimensional distortion allows the bubble to reside in a dimensional gap and have a fixed location on the positive homogenic space at the same time its whole mass lies in the heterogenic space. The fixed location on the positive homogenic space can be altered with strong magnets and thanks to the fact that the mass and location of the bubble are located on different dimensions, the moving speed of the location is not limited by general relativistic laws.
This phenomenon is called the Dimensional Distortion Bubble or DDB for short. By using powerful magnetic rail cannons to launch DDBs the people of the Milky Way have managed to explore great distances. There are a few different ways to build the necessary structures to allow FTL travel, but all of them use the DDB phenomenon.
The most common FTL launcher is a massive tubelike structure that works as a rail cannon. For example, the Human FTL launchers are built from five or six large rings called the Libertine Coils. These massive cannons are aimed towards the desired destination and complex calculation have to be made on the possible magnetic obstacles that might alter the course. Some launchers include their own computers for these instructions but most rely on the vessels own navigational systems to calculate the course.
To travel through these launchers, space ships have to be surrounded by a DDB that is cooled down to near absolute zero temperature. This cooling has to be done by the vessel inside the bubble but the DDB engine can either be an internal engine built inside the ship, or an external engine that is operated by the FTL launcher. After the bubble is cooled down to the critical temperature that results in superconductivity the FTL launcher shoots the DDBs location towards the desired destination. When the location reaches the destination the space ships own cooling systems release their exhaust heat and break the DDBs superconductivity. After that the ship emerges in the spot where its location currently is and the antimatter bubble returns to its own negative space.
If the location of the DDB is in a spot that is not a perfect vacuum when the bubble breaks, the matter inside the bubble merges with the matter that is in the way. To prevent this from happening most species have manufactured different kinds of arrival ports that maintain a vacuum for the DDBs. These gates provide a safe arrival for the travelling space ships. The two most common versions of a vacuum gate are the large and small vacuum gates. The large gates are massive in size and create a vacuum field so large that it is very easy to hit it with the FTL launcher. The small gates on the other hand rely on magnets to pull the DDBs into their vacuum fields. With these smaller gates the FTL launcher or the ship has to establish a delay free communication link through a FTL communicator to the small vacuum gate. If this is not possible the vacuum gate will not be able to use its pull magnets to draw the DDB into its vacuum field. It is very hard to hit these smaller vacuum fields without magnetic guidance.
The merging phenomenon of the DDBs is also used in DDB Merging.