At a deeper level, the double failure calls into question the very strategies for success that 20th century physics established. Perhaps the power of symmetry principles to reveal nature’s secrets has been drained, and a novel insight into how to pry secrets from nature awaits discovery. And the confidence provided by converging motivations may turn out to be more like wishful thinking than rigorous reasoning. Advocates of a multiplicity of universes,
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, that the best theory for explaining the observed universe implies the existence of others; two,
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, that mathematical formulations (embodied in superstring theory) describe a vast number of different potential vacuum states. Those many states can be interpreted as descriptions of multiple universes. But the dual dark matter failures would suggest that convergent motivations are no guarantee of correctness. Reasoning based on Rule 39 might not be so solid.
So maybe something extraordinarily revolutionary is lurking behind today’s failures. Or maybe not. The dark source of gravity distorting the motion of galaxies might simply be particles other than WIMPs —perhaps a very light,
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, wispy hypothetical particle called the axion. Or it might consist of black holes littered in and around galaxies.
In any event, failure to find or make dark matter particles does avoid one snafu that Kolb had worried about.
“Five years ago, I was concerned that we would have indications of new physics from LHC and different signals from direct detection experiments,
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, and we would be in a period of confusion trying to reconcile the signals,
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,” he says. “Well,
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, we don’t have that problem.”

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