How Dark Matter Was Born from the Geometry of the Universe ⚡ экспресс
Scientists have studied the link between mimetic dark matter (where a field mimics particles) and a Gauss-Bonnet topological term in an extended theory of gravity. It turns out that this interaction naturally creates dark matter right during the cosmic inflation era. With the right coupling strength, exactly the amount of dust-like matter needed is produced, and its density depends on the expansion rate of the Universe at the end of inflation. It's like a perfect recipe: inflation 'mixes' the ingredients, and out comes ready-made dark matter.
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.