Some interesting papers by Prof. Louis Crane and his Ph.D student Shawn Westmoreland
Are Black Hole Starships Possible?
…the right answer being “Yes! But they’re really hard to actualise.”
A note on relativistic rocketry
…Shawn refines previous work on just how high an exhaust velocity can be achieved by an antimatter-matter pion-rocket. Previous estimates were surprisingly low – Ulrich [...]