Physicists analyze rotational dynamics of galaxies and influence of the photon mass

Physicists analyze rotational dynamics of galaxies and influence of the photon mass
The rotation of stars in galaxies such as the Milky Way is puzzling. The orbital speeds of stars should decrease with their distance from the center of the galaxy, but in fact, stars in the middle and outer regions of galaxies have the same rotational speed. This may be due to the gravitational effect of matter that we can’t see. But although researchers have been seeking it for decades, the existence of dark matter has yet to be definitively proven and we still don’t know what it might be made of. With this in mind, the physicists Dmitri Ryutov, Dmitry Budker and Victor Flambaum have suggested that the rotational dynamics of galaxies might be explained by other factors. They hypothesize that the mass of photons, which are particles of light, might be responsible.
phys.org
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