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So I've recently watched the Netflix adaptation of The Three-Body Problem. One of the central plots of the show (and from what I can gather, also the book series) seems to be disappointingly half-baked, especially considering that the plot device is the namesake of the show and the title of the first book.
Something that's established early on is that the San-Ti (or the Trisolarans) live in a chaotic three-body (really a four-body) system that can't be predicted, and despite having the capability to enter into lungfish-like dormancy their civilisations kept being wiped out due to not being able to predict when destructive climatic shifts would occur. You could, however, probably predict the chaotic orbits of three bodies solely through simulation, the aliens would probably be capable of this. The issue for us and why it is "unsolvable" is that there’s no simple one size fits all solution where you can plug in initial starting conditions and predict the state of three bodies at any point in time - but you can move each ball a little bit as a small amount of time passes, and then recalculate.
Of course, methods which iteratively compute position can and do deviate from reality, a small error can result in large deviations in the model over a very long period of time, but you can minimise error to a very high degree. And if you’re living on the planets themselves, you can constantly update the state of your simulation every time your model observably deviates from reality. So an iteratively computed model, continuously updated to align with current state, would probably help them avoid dying off at any given point, because T = 0 keeps being reset and you only ever need to calculate T + 1.
Note also, these are aliens that can unfold a photon’s higher dimensions, inscribe a supercomputer onto it, fold it back down, send it to a target site then communicate instantaneously with it via quantum entanglement. Aliens capable of incomprehensible space magic aren't capable of simulation, apparently.
The Dark Forest theory just doesn't make sense on its own terms.
A civilization with access to exponential self-replicating probes is very hard to eradicate. The offense and defense equations change drastically when the latter have massive advantages in mass as well as the ability to disperse.
Further, it doesn't take imaging technology much better than ours to spot biosignatures from the other side of the galaxy. An inferometric telescope maybe an AU across in terms of effective lens size would work just fine. With better modeling, you could simply predict which planets are likely to be habitable, and then RKV the fuck out of them a few hundred million years before they develop multicellular life.
You can launch from distant outposts, outside the galactic plane even, a delay of decades or centuries means nothing on those time scales. No need to make your own system the obvious target. But in return, any civilization close to a Type 2 in terms of energy budget has the ability to sterilize the galaxy and barely notice the expense. They're also likely so dispersed and decentralized with off world outposts and robotic manufacturing and infrastructure that simply blowing up their home planet or razing it with a Nicoll-Dyson beam would only be a mild inconvenience. And there's no way to hide when you have one of those, that we know of.
If there were highly advanced and malevolent civilizations lurking out there, barring truly out there technologies and an implausible ability to cover their tracks in terms of emissions and signatures from before they knew how to start hiding or even the ability to do so, then there is simply no sense in trying to hide.
You should aim to get as big as possible, as fast as possible, if your Von Neumanns arrive at a system that's actually home to a hiding super-civilization, well they'd have found you first, but that's a problem tens of thousands of light years away. If they RKV you, so fucking what, you've got outposts past the Oort and can amass teratons of fuck-you in return. Your best bet is signaling that you're too big to fuck with, and the only way to get there is to grow.
Thankfully it seems that we're alone in the galaxy or even the cluster, unless there's very good reason why civs would have access to energy sources even more abundant than nuclear fusion and also coincidentally ignore all the lovely stars left free to waste theirs.
You can't hide. You can run. You can make them regret it. If you spot techno signatures across the galaxy, better be sure they won't be capable of sending RKVs back, but that's an acceptable cost, and in the meantime you need to rush for all the empty real estate.
What does Reykjavik airport have to do with anything?
Assuming not a joke - relativistic kill vehicles.
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