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What do we know?We know that in the very early stage of our Universe, matter did not exist and the Universe was filled with radiation. Only later, when the Universe expanded and started cooling, matter was created out of this radiation.
Standing hypothesis:Right now, scientists believe that dark matter (which is proven to exist) would slow down expansion of the universe, and that dark energy (not yet proven to exist) is accelerating the expansion of the universe.
My hypothesis:What if there is no dark energy? What if the acceleration of expansion is merely an effect of a Universe-wide conversion of matter back into radiation (like stars use matter to create light and heat), without a countering conversion of radiation into matter (because the Universe is too cold for that)?This would continuously lower the total mass of our Universe, and therefore constantly lowering gravitational pull. Combined with conservation of expansion momentum, this might explain the acceleration of expansion of the universe.