How Modified Gravity Explains Our World ⚡ экспресс
We investigate gravitational baryogenesis in scalar-nonmetric theories of gravity, focusing on two models with non-minimal coupling: f(Q,φ) = Q + ξ Q φ² and f(Q,φ) = α Q^n + β φ Q. The evolution of the baryon-to-entropy ratio is examined as a function of the cosmic expansion parameter γ assuming a power-law scale factor. In the first model, this ratio decreases monotonically with increasing γ, and the observed baryon asymmetry of order 10^{-11}–10^{-10} is reproduced for γ ≈ 0.2–0.3 without fine-tuning. In the second model, acceptable values α ~ 10^{-3}–10^{-2} and β ~ 10^{-2}–10^{-1} yield the correct magnitude, with specific combinations giving precise agreement with data. The results confirm the viability of scalar-nonmetric gravity as a mechanism for generating the baryon asymmetry. The interplay of nonlinear geometric terms and scalar couplings plays a key role, opening new directions in modified gravity and early-Universe studies.
In the first second after the Big Bang, the universe was a boiling cauldron of energy. Particle-antiparticle pairs were born and instantly annihilated each other. But for every billion such pairs, one particle of matter survived—and that leftover became stars, planets, and people.
New research blames modified gravity for this. If spacetime isn't just curved but has an extra geometric feature (like stirring soup with a spatula instead of a spoon), then gravity tips the balance in favor of matter. The key turned out to be the expansion rate, which affects entropy (a measure of disorder). At the observed expansion speed, the model yields the required excess without fine-tuning.
🎯 The energy released during the annihilation of the first particles was trillions of times brighter than all starlight. We are the ashes of that magnificent fire.