2025/02/12 by Alessandro Tronconi, Tronconi, Alessandro, G. Venturi +1
Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #Space Science and Extraterrestrial Life
paper · pdf · doi:10.48550/arxiv.2502.08334
openalex publication_date 2025/02/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A global scale-invariant Dark Energy model based on Induced Gravity with the addition of a small R2 contribution is examined. The scalar field (quintessence), playing the role of Dark Energy, has a quartic potential and generates Newton's constant with its non-minimal coupling (after introducing a suitable symmetry breaking). Even when small, the R2 contribution significantly modifies the cosmological evolution of the matter-gravity system. The solutions to this model are obtained analytically through a perturbative expansion and oscillate with transplanckian frequency. They are then compared with similar solutions found for ΛCDM cosmology plus R2. Finally scalar field production is perturbatively taken into account in a simple model and the resulting effects illustrated.