Alastair Reynold's novels have so many really interesting and cool ideas in them. I think the greenfly are what you're thinking of, but in that series, there w

Alastair Reynold's novels have so many really interesting and cool ideas in them. I think the greenfly are what you're thinking of, but in that series, there was also the case of a neutron star that was entangled with itself and functioned as a giant, time-independent computer.