[int_19h]

My take on hard sci-fi is that it must either use science and technology that we already understand, in ways conforming to that understanding, or - if it presents new technology that is posited as something beyond our understanding - it must be consistent, including other "magic" as well as interactions with things we do know. Some examples of what I would consider hard sci-fi: "Tau Zero", "Tales of Pirx the Pilot", "2001", "Seveneves", the Mars trilogy.

All of these components are lacking in the book, and it's not just the particles. It reads very much like someone subscribed to some popular science journal for a few years, and then just dumped every idea that sounded interesting into a book without much understanding of what it is about.

To give another example, the author references string theory - great! - but then he has a one-dimensional string - that makes up an elementary particle - break apart into "pieces" from gravity.

Or take alien propulsion. It supposedly works by collecting antimatter from space - but where in space is there enough antimatter to collect like that, and why hasn't it annihilated from interaction with the much more prevalent hydrogen? The interesting thing about this example is that it's not insurmountable - hard sci-fi could explain it away in some convincingly sounding way - but the book doesn't even bother to, it's just presented as fact, without even pointing out the contradictions.