Their theory, dubbed RelMOND, adds to the equations of general relativity an omnipresent field that behaves differently in different arenas. On the grandest scales, where the universe noticeably stretches as it expands, the field acts like invisible matter. In this mode, which Złosnik refers to as “dark dust,” the field could have shaped the visible universe just as dark matter would. The model faithfully reproduces the temperature of the CMB — the result that the duo published in their preprint — and Złosnik says it can also match the polarization spectrum and the matter distribution, although they have not yet published these plots.

In place of dark matter, they substitute a subtly modified force of gravity.

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