Revelation Space by Alastair Reynolds. The author is a physicist, has some really amazing concepts in it and the setting is pretty unique. The original books were written quite some time ago but he came back and added some more to the series later: https://www.goodreads.com/series/56392-revelation-space
I also suggest reading these shorts set in the same universe, in particular Diamond Dogs, which is one of the craziest stories I've ever read: https://www.goodreads.com/book/show/893590.Diamond_Dogs_Turquoise_Days
But hands down my favorite scifi series *of all time* (and I've read a lot of books, including 6 or so of the Lost Fleet) is the Sun Eater series by Christopher Ruocchio. Amazing writing, really great main character, and the setting is awesome:
https://www.goodreads.com/series/231285-the-sun-eater
I also suggest reading these shorts set in the same universe, in particular Diamond Dogs, which is one of the craziest stories I've ever read: https://www.goodreads.com/book/show/893590.Diamond_Dogs_Turquoise_Days
But hands down my favorite scifi series *of all time* (and I've read a lot of books, including 6 or so of the Lost Fleet) is the Sun Eater series by Christopher Ruocchio. Amazing writing, really great main character, and the setting is awesome:
https://www.goodreads.com/series/231285-the-sun-eater
It is quite different to the movie, though, keep that in mind.
That being said, while many of the ideas in the book will appeal to people here, some probably won't, so if you're looking for something that will conform to the current ConPro ideology, this is closer than most but still not quite there yet.
This is why you really need to distinguish the book from the movie. Heinlein called himself a libertarian but he was also in the military.
The entire theme of the book is willingness to sacrifice. The ships name , Roger Young, is named after a guy who sacrificed himself so his team could assault an enemy machine gun nest.
It's an "ask what you can do for your country, not what your country can do for you" idea.