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Frame dragging and ergosphere of a blackhole

I’m writing a 25 page paper on the Kerr solution to a black hole and I’ve written half and I need help on finishing the rest of the paper. I’ve already written out all the details of solutions to Einstein’s field equations in terms of the schwarzchild metric and kerr metric, but I need to add details about what is the ergosphere and what exactly is frame dragging and how does it happen. My paper can include as much math as necessary or none at all. I just need to add more information to get to 25 pages. You don’t have to worry about formatting because I’m going to take care of that later.