The publication of a potentially testable quantum field theory that can accommodate gravity is causing excitement — but it comes at the expense of Lorentz invariance.
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Visser, M. Progress at a price. Nature Phys 5, 385–386 (2009). https://doi.org/10.1038/nphys1298
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DOI: https://doi.org/10.1038/nphys1298
