Warning: he writes huge tomes. They're far too long. The first I read was fun, the second a slog. There won't be a third.

He has a whole follow-up trilogy from Pandora's Star. They are every bit as massive and pondorous. I personally liked them just enough to finish them, but I won't re-read them.

However, I absolutely love the Night's Dawn Trilogy and re-read it once every few years. I think I read it at an impressionable age and it really stuck.

One could also consider reading Charles Stross' "Accelerando" which has plenty of stuff about dyson swarms.

I only read Pandora's Star so far, but I really liked the fact that it was a rather optimistic vision of the future. Humanity had colonies on dozens or hundreds of planets, and due to life extension people were basically immortal and could even choose the shape of their body.

Definitely read the sequel Judas Unchained. Those books are probably my favourite novels.

For more Peter F Hamilton optimistic future of humanity, see the Night's Dawn trilogy.

Thank you! Any other optimistic and believable sci-fi you would recommend?