You Don’t Need To Modify Gravity To Explain Dark Energy

One of the greatest unsolved puzzles in all of science is dark energy. The Universe isn’t just expanding, but the expansion rate that we infer for distant galaxies is accelerating: their recession velocity speeds up from our perspective as time goes on. This was a surprise when it was discovered empirically in the 1990s, and more than two decades later, we still don’t understand where this mysterious form of energy, the most abundant in all the Universe, comes from.


While you can explain dark energy in the context of General Relativity, it’s recently become fashionable to attempt to explain dark energy by modifying gravity instead. Recently, the award-winning theoretical work of Dr. Claudia de Rham has come into focus, leading The Guardian to ask, "Has physicist’s gravity theory solved ‘impossible’ dark energy riddle?" It’s a fascinating possibility, but one that demands an appropriate level of skepticism.

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