None have ever been published and never shall be – but, if some future generation of intelligence manages to repave the information superhighway, they can read who first had the ideas.
(3) 'Random walks' are not random. They cannot begin until there is a pathway to the target. They exist to establish the most efficient and redundant pathways. Otherwise, sources would expend all their energy sending out runners to look for non-existent targets. Nature is smarter than that.
(2) Sentient life is evolutionary. All of it, everywhere. But that's not the observation. The observation is that, at exactly the same time, geologically speaking, that life develops the technology to leave it's planet, it also consumes the finite, non-renewable resources of it's planet and goes extinct. It does this by choice, although that choice is an unforeseen consequence of other choices.
So…whoever, or whatever repaves the information superhighway may well be an intelligent machine, or something whose RNA originated elsewhere – as ours did – because when the earth was one minute old, it was sterile. But it won't be an organism which built a space ship and came to visit.
(1) The speed of light is by no means the speed limit of the universe. That was known to Einstein who spoke of 'spooky events at a distance' which occurred at faster-than-light speed. The speed of light is the speed at which all of the current math produces testable solutions. That's all it is. When we learn more, we can do more. Locking in limits only limits thinking.
—90% of success is showing up. Getting the math right is the other 50%.
Aut viam inveniam aut faciamaut viam inveniam aut faciam.