what is logic behind rebirth I was listening to this video, from Bhante Vimalaramsi. He says that one meditator experienced his past live and he had some pscotherapy before this. How is that possible?
Buddhist talk about mind stream which flows to another body when a body dies, well what is this mind stream? This is the conciousness right? Is that some kind of emf waves or similar to wave which science hasn't descovered yet?
You won't find one single answer which covers all traditions. Different Buddhist traditions have different interpretations of the mechanism of rebirth.

I think you are looking for something material which facilitates a movement of something from one life to the next. However, Buddhism doesn't require that the world governed by materialism. We can consider a world which is entirely driven by mental ideas or "the mind" as we call it.

Buddhists are not in agreement about how the world exists, some would say that the world doesn't exist. If you consider one of these traditions then you have to ask if it even makes sense for something to move from one body to the next life's body. Bodies can also be considered as being entirely constructed by the mind. Yogachara is an example of a Buddhist tradition which is "mind-only".