If you haven't already, then don't wait to buy the rest of Greg Egan's œuvre. It was "Quarantine", a lovely plot but arguably one of his weakest stories, that got me into his work, and since then I've found no-one except possibly Ted Chiang (whose work is very different) who comes anywhere near him in the world of hard sci-fi. Almost everything of his is rewarding, and I believe a lot of it was relatively recently (within the last 5 years or so) released as e-books after a long period of unavailability. He also has generous excerpts from selected books and stories at his web-site, and—my favourite—proves his non-fiction science bona fides as a regular contributor on the n-category Café (https://golem.ph.utexas.edu/cgi-bin/MT-3.0/mt-search.cgi?Inc...).