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Not a unique one, but the dark forest hypothesis.
Fortunately for us, this one isn't too likely, because realistically, an alien civilization capable of travelling the relevant distance and destroying another civilization isn't something that can be hidden from. They should be able, fairly easily, to examine every planet in the galaxy and see which ones have life on them, and wipe it out before any civilization ever arises at all. The fact that we exist at all necessarily implies that nobody in this galaxy has been committed to going this, at least for the past billion years or so.
I mean its entirely dependent on whatever theoretical sci-fi gimmick utilized to close that gap. Are we betting on FTL, near the speed of light, or the left field entry ... intra dimensional travel?
The dark Forrest theory is mostly dependent on FTL, where the ability to destroy a planet is on par with the discovery of the planet. Meaning that it's not so much a seek and destroy scenario, but more like two scared drunks stumbling in the dark with loaded shot guns.
Again, this theory isn't supposing that there is a omnipresent alien race, but that all species are searching in the dark with a flashlight. Just because you have the ability to look everywhere, doesn't mean that you can look everywhere at once, and the universe is infinite.
Again, this presumes that just because you have FTL tech means you have limitless resource and man power. When in reality the theory presupposes that FTL increases resource competition, not diminishes it.
I was presuming that nobody has any ftl tech, given that it seems to violate the laws of physics for such a technology to exist. And you can look virtually everywhere, in the galaxy at least, with the right technology (and probably less advanced a tech than needed for manned space travel, what you need is a machine, capable of using the resources available in some asteroid to construct more of itself, and send those copies off towards other star systems. These probes would multiply exponentially until they've explored every star in the galaxy, with no further input required beyond building the first one)
But the entire premise of the Dark Forrest theory is dependent on FTL. It is what gives the participants in the theory the motivation to respond instantly.
This notion is just as fantastic as the idea of FTL. Even if we're to accept that flt is theoretically possible, the machines building machines senario you spoke of would be moot. If these machines were to traveled a significant enough distance, by the time they or their signal returned it would be hundreds of if not thousands of years later.
There is no way to observe the rest of the galaxy along the same access of time we currently observe. Even if you had the capability of finding another society so far away, it wouldn't really mean much, the light or energy you used to observe them is likely hundreds of not thousands of years old. Meaning the image or information it contains is by default "out of date".
I'm aware the information would be out of date, that was part of my point in another response for one of the reasons I don't imagine the scenario works, because attacks arrive at a distant point in the future. I've never personally heard the dark forest scenario as requiring ftl tech, making that a requirement seems to make the entire premise moot as it requires throwing a pretty fundamental part of physics out to even contemplate.
FTL is the only thing that makes it applicable to game theory. If there is no import to respond instantly, then there is no imperative to respond.
The query is dependent on the hypothetical that the instant someone spots you in the dark Forrest they have an option of removing you from the game unless you remove them first.
So does going to war with an alien race, or even finding another sentient race? How are you supposing these aliens are finding every sentient race in the galaxy if they can't push a search signal faster than an electron? It would take thousands of years for a signal to travel to the closest potential suitable planet, let alone every suitable planet.
The theory itself requires a suspense in disbelief, as do any that pertain to encounters of the third kind. I would say that the limitations in physics that prevent the possibility of FTL are of the same order and magnitude that prevent us from contacting aliens.
Not at all, there is nothing physically impossible about someone engaging on projects that take centuries or millennia to complete, it just requires a lot of patience and effort. Finding or even attacking an alien species does not fundamentally require anything disallowed by physics, it just requires a long timescale to do slower than light. My assumption was just that any hostile aliens would simply conduct those hostilities over very long periods of time. Having interstellar travel at all, assuming no ftl, sort of implies a willingness to undergo these kinds of long term efforts anyway, and it doesn't seem absurd to imagine that anyone with the technology to have those kinds of energies at their disposal might also have very advanced medical technology, such that they might live a very long time, which could lend itself to more long term thinking.