^If I'd done the computation myself instead of using a java calculator,
I'd feel smarter.

Unfortunately, I haven't had the gumption to independently verify the derivations. The Hawking radiation calculator can be found at
http://xaonon.dyndns.org/hawking/ . Make sure to hit return after changing one of the variables.
newtype_alpha said:
They're artificial. At a guess, I'd say they're probably produced using red matter, a Romulan trademark. Considering the artificial black holes in NuTrek didn't last very long, they probably need a fairly large amount of it to create a stable mini-singularity, plus some kind of antigrav containment vessel to keep it contained.
I'm not a big fan of red matter because of its extreme handwavium-type properties (if it was just a captured strangelet, I could at least let it go for being neat

). But from an in-universe perspective, red matter also seems to be a Federation invention which the Romulans--Nero notwithstanding--did not have access to, particularly during the critical days/months/whatever it took for the Hobus superluminal supernova (

) to reach Romulus.
And at any rate, making a truly artificial singularity is going to be a tremendously inefficient process. I don't even know how you'd go about it. You can create black holes with particle colliders, but a 275,000 ton one? Or even a 10,000 ton one? (Burns at 3.5 exawatts and rising, and lasts 84,000 seconds, i.e., less than a month.) Remember how weak gravity is. Only vast masses can overcome the electromagnetic effects and degeneracy pressures.
Romulus is a military dictatorship with a fascist government. A quantity of antimatter small enough to fit in a tylenol packs enough energy to demolish entire buildings. No matter how good Romulan security is, a resourceful enough agent could suicide bomb the entire senate in a power grab. So it's probably a given that antimatter is on the list of STRICTLY prohibited substances in the Empire.
An interesting notion, to be sure. I doubt it's totally unregulated in the Federation, either, however (just as I doubt I could get my hands on a significant amount of uranium in the United States, although the electricity with which I'm writing this was probably generated by it). I'm positive the power generation plants on Earth, if they are antimatter, are 1)probably beneath enough rock to contain the explosion due to any Praxis-lite accident, and far enough away from each other so as any malfunction with one plant would not cook off other stockpiles; and 2)highly circumscribed as to who may access them.
However, even if antimatter is a heavily restricted substance in the Empire, as I believe you're right in asserting, it still doesn't explain why their
military would not use it, when it's shown as being more effective and less "cantankerous" than the singularity drive. Heck, almost as often as not, the D'Ds we see in Trek are suffering from major equipment failure, stopping time, pulling Irishmen through time, falling through time, basically the singularity drive should not be used in an environment with time.

All the annihilator reactors do when they fail is blow up. Except that one time, in AGT, and that other time, in Cause and Effect... well, I still can say that's demonstrably not an effect of the mass-energy conversion.
At the least, you'd think they'd use antimatter for their torpedoes--but they don't, they use continue to use plasma (thermonuclear?) torpedoes. At least they do until NEM, when they seem to swtich to pho-torps. Possibly as a result of occupying the Cardassian antimatter energy infrastructure?
The other thing about an annihilator reactor is that you can turn it off. You can never turn off a singularity drive. It will keep spitting out radiation until it evaporates. It will get increasingly hot, until finally it will explode. No 100-year life cycles for the Romulan ships. Whereas the Feds' Mirandas and Excelsiors keep going strong.
Oh, this reminds me, the singularity drive may be the reason the D'D has no impulse drive system. The mass of the singularity probably makes Newtonian propulsion ridiculously impractical--although I wonder how much more impractical than the clearly much-heavier-than-they-say Fed starships.
Probably. Just like everyone else in the universe.
DS9 has all these things, why should the Romulans have to do without?
I dunno. DS9 was pretty crappy, though. I bet you couldn't run a replicator and a lamp on the same circuit.

Also, I'm not sure antimatter batteries were never installed. Although I'm a big defender of fusion-run warp drive (Zef Cochrane did
not have a particle collider in his back yard, or a dilithium mine, and the Rom BoP's maximum, emptied-tanks speed was not one billionth of the
Enterprise's), it stretches credibility to think that fusion could run replicators, transporters, weapons, shields, holodecks, and so forth.
I go on about this, I realize, but the economics of Star Trek fascinate me at least as much as the science and technology.