No, because small black holes evaporate too quickly and natural ones would have disappeared long ago
Are you implying that small black holes have ever formed naturally at all? If there is some process that formed random size black holes long time ago, the small ones might have already evaporated, but the medium ones might be just finishing their evaporation right now. Of course, such a process might not have occurred, ever.
100% efficiency
Efficiency isn’t quite the right metric here. I think we need “power”? So, how much power does the small black hole produce? It’s my naive understanding that this power only depends on the radius of the hole, not on how much matter you’re throwing into it. Though I guess you could just have several black holes, if one isn’t bright enough?
Yes, there are primordial black holes, I’m just not certain exactly how dubious their existence is.
Anyway, the point is that if there might be currently evaporating black holes, but we don’t see them, then maybe that’s because they’re not all that bright. Then, despite their high efficiency, they may not be a viable tool for signaling.
Are you implying that small black holes have ever formed naturally at all? If there is some process that formed random size black holes long time ago, the small ones might have already evaporated, but the medium ones might be just finishing their evaporation right now. Of course, such a process might not have occurred, ever.
Efficiency isn’t quite the right metric here. I think we need “power”? So, how much power does the small black hole produce? It’s my naive understanding that this power only depends on the radius of the hole, not on how much matter you’re throwing into it. Though I guess you could just have several black holes, if one isn’t bright enough?
See https://en.wikipedia.org/wiki/Primordial_black_hole.
Exactly, you use as many as needed to reach the power you want.
Yes, there are primordial black holes, I’m just not certain exactly how dubious their existence is.
Anyway, the point is that if there might be currently evaporating black holes, but we don’t see them, then maybe that’s because they’re not all that bright. Then, despite their high efficiency, they may not be a viable tool for signaling.