There is a scientific theory about the beyond, which is often neglected by many “scientists”, specially skeptics.
I summarized it in German “A physical theory of the beyond“.
The author of the theory, Klaus-Dieter Sedlacek, formulated it in a scientific way, so it is falsifiable.
The book is written as a novel, where a group of scientists meet to formulate a theory of the beyond.
The figures a fictive, the content is a fact.