![]() ![]() Your FTL either somehow breaks causality, or causality is not a fundamental part of reality (Stephen Baxter’s Xeelee Sequence). Another variation on this is Hawking’s Chronology Protection Conjecture You can time travel if you like, but it’s usually pointless sightseeing, or you were always supposed to try to kill your grandfather. The universe of your setting is super-deterministic (no paradox is possible) - Google “Quantum Super-determinism” for some background. Something about the physics of the drive ensures a preferred reference frame (think Star Trek and subspace or hyperspace in Iain Banks’ Culture Series) - your civ can use a space-magic extra dimension of space, but it can’t be used for meaningful time travel as it has its own internal clock It’s extremely likely that wormholes are destabilised if you try to use them for time travel, so you could simply have a bunch of pre-existing stable wormholes (that have no paradoxical routes) that your FTL civ knows how to exploit A wormhole network sharing a reference frame. Your choices, if you’re looking to avoid causality paradoxes while retaining FTL, are: Reposting this (with tweaks) from an earlier thread: I am open to suggestions and ideas on how to overcome this obstacle in a way that is consistent with real-world physics and the established universes of both civilizations. Therefore, I need to find a way to address this problem in a believable way. ![]() As I want to maintain a consistent application of real-world physics in the story, I cannot handwave this issue away. This presents a problem as FTL travel can allow for the transmission of information back in time, which would cause time-travel mishaps and disrupt the laws of real-world physics. One of the major challenges of reconciling these two universes is the issue of FTL travel, which Civ B possesses. The second civilization, Civ B, is more of a classic soft sci-fi society with unrealistic technologies such as FTL travel and pew-pew "lasers", but a surprisingly small population for an intergalactic "empire". ![]() They have access to advanced technologies that are theoretically feasible, with certain limitations that could be handwaved for the purposes of the story. The first civilization, Civ A, is an advanced society with capabilities based on hard science, as exemplified in the work of Isaac Arthur. I am thinking of writing a story where two civilizations from different universes meet. ![]()
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