How do You reconcile MWI with the 1st Law of thermodynamics?
Why do you see a conflict? You seem to be assuming both that the total energy of the universe is positive (not known!), and that each universe has the same total energy (i.e. that energy is not arbitrarily scalable). Why not assume that a universe with 100 joules of energy splits into two universes—one with 100 zorkmids of energy and the other with 100 arkbarks of energy (where it is understood that 1 zorkmid + 1 arkbark = 1 joule).
Why do you see a conflict? You seem to be assuming both that the total energy of the universe is positive (not known!), and that each universe has the same total energy (i.e. that energy is not arbitrarily scalable). Why not assume that a universe with 100 joules of energy splits into two universes—one with 100 zorkmids of energy and the other with 100 arkbarks of energy (where it is understood that 1 zorkmid + 1 arkbark = 1 joule).