The bit I removed from the "Negative mass" article said:
In April 2017, researchers at Washington State University claimed to have created a fluid with negative mass inside a Bose-Einstein Condensate.
I expanded it ever so slightly to read:
In April 2017, researchers at Washington State University claimed to have created a fluid with negative effective mass inside a Bose–Einstein condensate, by engineering the dispersion relation.
Slightly awkward, but hopefully at least a slight improvement.
PS: also added a "disambiguation" thingy at the top ("For negative mass in theoretical physics, see Negative mass."), now realizing it may be of dubious utility.
Someone had already added the paper to the "Negative mass" article, so I removed it:
https://en.wikipedia.org/w/index.php?title=Negative_mass&dif...
... And added it to the "Effective mass (solid-state physics)" article:
https://en.wikipedia.org/w/index.php?title=Effective_mass_(s...
The bit I removed from the "Negative mass" article said:
In April 2017, researchers at Washington State University claimed to have created a fluid with negative mass inside a Bose-Einstein Condensate.
I expanded it ever so slightly to read:
In April 2017, researchers at Washington State University claimed to have created a fluid with negative effective mass inside a Bose–Einstein condensate, by engineering the dispersion relation.
Slightly awkward, but hopefully at least a slight improvement.
PS: also added a "disambiguation" thingy at the top ("For negative mass in theoretical physics, see Negative mass."), now realizing it may be of dubious utility.