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Well... The website seems like it just messes with things. But I remember an article claiming that phonos of sound in atmosphere behave like they have negative mass. Cause the sound wave would travel faster in the denser layers of air from the bottom, making the sound wave to go a little upwards, like a refraction.

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Phonons can have a negative effective mass - in other words, you can mostly ignore the effect of the background environment if you simply change the mass to be something else (which can be negative).

That’s very different than having a negative actual mass.

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