Handwritings in page 2 explain further details of our assumptions. Special Relativity theory assumes the state of absolute vacuum. But this status is not defined, i.e. there is always a minimum existence, otherwise light speed itself cannot exist. Why? Because one needs minimum two requirements to talk about space and time:

1) an electro-magnetic field to transport photons,
2) a minimum of one photon defining the status of vacuum (reference system in space) as well as minimum one photon defining the status of Eigen-System (reference system of movement).

Giving these minimum requirements, one finds an unbelievable small, but still existing deviation relative to the theorem of Einstein assuming “absolute” vacuum. This small vacuum deviation, studied in several research papers of Einstein himself, we will call zero-like vacuum to distinguish it from absolute vacuum. These minimum conditions for the existence of space and time as well as the related numbers of non-constant speed of light, are so small that it will lead us to a hidden world of different physical laws when it comes to interactions of energy fields and moving objects. That is why we called it <i-worlds>.