I'm looking for a book where there are 3 versions of the human race. The simulated humans, robotic humans, and organic humans.
Either the robotic or simulated humans finds out about a disaster, I think a supernova, that wipes out the organic humans.
I don't remember what happens next, but I think the robotic humans go all around the galaxy and start trying to trail a alien species through several dimensions.
Anybody know the name of this book?
This is Greg Egan's Diaspora.
From Wikipedia:
By 2975 CE (Universal Time), the year in which the novel begins, humanity has "speciated" into three distinct groupings:
fleshers, biological societies consisting of statics, the original, naturally-evolving race of Homo sapiens...
gleisner robots, individual software-based intelligences housed inside artificial anthropoid, or flesher-shaped, physical bodies ...
the citizens, intelligence as disembodied computer software running entirely within simulated reality-based communities known as polises.
