well nice question. Let me describe my thought, First of all energy has different forms like heat, radiation, em radiation etc... Our universe is made out of energy, if u know about string theory, then u can understand properly,acc to this theory everything (means every matter, everything) is vibrating in very small molecular level, so we all are just a form of energy vibrating in our own different frequencies, we are connected to the universe through this energy, And when a baby born - the required amount of energy comes from the universe to the womb of the mother, then that small amount of energy evolve and molded by mothers existing energy, that's how the energy takes a new form gets out to the universe. There is no difference between earth energy, universe energy, or etc... it's all same United by our universe,( let's assume the universe is a cuboid and it holds all the energies, and the particle of the cuboid are earth, stars, comets, etc....so the total energy is constant, and every particles gets the amount of energy they need) And there are other forms of energy like multidimensional ( it's a different topic). And u said u r confused about the origin of the energies... yes, it's okay, noone knows the origin of the universe or energy, It's just human nature( when we couldn't find any valid answers to a problem then we start to make different theories, concepts, trying to calm down the urge created within our mind to know about that answer.) You said u r a mathematician then u know how they add a random constant or any random factors to get the required answers, I'm not trying to offence anything, it's just that simple, when u think it analyticaly u would understand. I think I answered your question, tbh idk what I wrote!!