How Dark Matter Was Born from the Geometry of the Universe ⚡ экспресс
The connection between mimetic dark matter and a Gauss-Bonnet topological term, added to the Einstein-Hilbert action, is investigated. It is shown that such interactions can naturally generate mimetic dark matter during the inflationary stage of cosmic evolution. With a suitable choice of coupling between the mimetic field and the Gauss-Bonnet term, the required amount of dust-like dark matter is produced at the end of inflation, and its energy density is expressed through the Hubble parameter at that moment. Moreover, depending on the coupling form, the behavior of mimetic dark matter after the matter-radiation equality epoch may undergo slight modifications.
In the first moments, the Universe went through a brief but turbulent period—inflation, when it expanded at a colossal speed. This idea was proposed by Alan Guth. At the same time, particles of ordinary matter were born. The origin of dark matter, the invisible substance holding galaxies together, long remained a mystery.
New research shows: dark matter could have emerged directly during inflation thanks to the geometry of space, which acted like a kitchen mixer. A special curvature of space itself "whipped" the energy field into fine dust—and thus dark matter was born. Invisible and barely interacting, it behaves like a scattering of heavy grains, from which cosmic structures later formed.
Amazingly, the resulting amount of dark matter matches observations exactly—and no manual parameter tuning is needed. Everything depends only on how fast the Universe expanded at the end of inflation. After matter became more abundant than radiation, the behavior of this dark matter may shift slightly, giving hope to detect such deviations and confirm the geometric origin of the hidden mass.
🎯 The amount of dark matter in this model required no fine-tuning—it just matched observational data, as if the geometry itself knew the right recipe.
🎬 Just as in the movie Interstellar, curved space influenced time, here geometry creates invisible matter.