I think descriptions of how a metahuman's powers work might be better if they described the observed phenomena rather than attempting to provide a scientific mechanism for the powers. Or, if an explanation is given, perhaps it is based in something more fantastical, like maybe Ibis theorises that Mona recharges from sunlight because of the conceptual link between her black/white hole powers and starlight.
This kind of approach would mean that you could avoid physics-related descriptions that may contain mistakes or that pose many more questions than they answer.
Here are a few physics-related bits of description from Ibis that I think are strange:
Her body has the density of several galaxies.
Ibis probably means "mass". But if this is true then how would Ibis have possibly measured that? If the gravity of that mass was perceptible then any testing apparatus, and the planet, would be rapidly destroyed.
"It appears to be trapped energy, orbiting her core. How it resembles her old appearance and how she can still perceive sensation from it is a mystery that is currently beyond me," Ibis says in a rare admission of ignorance, "But it's also the source of her destructive potential. It orbits her body at an angle. The light we saw during the administration was caused by the friction of all the matter rubbing against each other as it swirled into her core."
The theme of mass falling into a black hole and emitting radiation is cool, though the orbit stuff, especially about angled orbits is confusing to me. Mass falling into a black hole can emit radiation without Mona having to create a particle accelerator. And if she can create a particle accelerator then that would probably be more efficient.
It's also confusing that there is both mass and "energy" orbiting her core. Energy is a bookkeeping concept: a quantity of work that can be transferred between different forms (kinetic, gravitational potential, thermal, radiant, etc). It's not clear to me how "energy" could be orbiting her core. Perhaps you mean that light is orbiting her core, but light is something that generally does not orbit things: it goes in straight lines (if you want it to orbit something then spacetime itself has to be bent enough that the straight line becomes a circle, but if it is bent that much then you can't perceive anything on or beyond the circle).
"The only limit to the subject's power is that she uses her body for 'fuel'. This makes sense since she's literally blasting parts of herself away. Her body regenerates by absorbing radiation. The ambient ultraviolet light in the atmosphere is enough to do this over time, but I imagine it would happen more quickly with other sources."
I don't understand how ambient light would recharge anywhere near the amount of energy expended to allow Mona to fly, blast buildings apart, etc in any kind of reasonable time scale. And if you set this as a baseline then it opens up weirdness like putting Mona in a sunbed to turn the power output of the sunbed into something much more useful.
It's also weird that parts of her body are disappearing. Like, are they really there or are they projections made by Mona? If they're projections, then why lose body parts rather than thinning out or something?
