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I agree, either we've escaped detection or the dark forest theory is wrong.
Couldn't antimatter bursts get an object to extremely high speeds relatively cheaply?
Well, "relatively cheaply" is a hard standard to nail down. I would say "no", though. Antimatter is very expensive to manufacture and store and you're going to need a lot of it. All of the energy that comes out of an RKV hitting its target has to be put into it in the first place, probably several times over given the inefficiencies likely inherent in the process.
Fair enough, guess it depends on how many resources they're willing to sink into first strike capability. Maybe a strongly expansionist civilization would have such a more efficient use of resources it would quickly catch up to a dark forest predator trying to wipe them out. Like a swarm of piranha eating a shark.