Warped Speedos?

Repulsive Photons

by Oliver Morsch, ETH Zurich / via Phys.org / February 25, 2019

Light particles normally do not “feel” each other because there is no interaction acting between them. Researchers at ETH have now succeeded in manipulating photons inside a semiconductor material in such a way as to make them repel each other nevertheless.

If that’s true, why are they going “Mmm”?

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