Couldn’t you use big black holes to suck up dark matter, and then harvest energy/​momentum from those? Even if the large size is not ideal for the next step of conversion, making the dark matter capture even marginally easier seems like the more important consideration given the ratios involved.
Couldn’t you use big black holes to suck up dark matter, and then harvest energy/​momentum from those? Even if the large size is not ideal for the next step of conversion, making the dark matter capture even marginally easier seems like the more important consideration given the ratios involved.