Reported 'chameleon' particle would change its mass to match its environs.
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References
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Additional information
Editor's note: The chameleon theory was first proposed by Justin Khoury along with Amanda Weltman. Both were at Columbia University at the time.
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Merali, Z. Dark-energy particle spotted?. Nature (2009). https://doi.org/10.1038/news.2009.531
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DOI: https://doi.org/10.1038/news.2009.531