2024/12/12 by Maribel Hernández Márquez, Márquez, Maribel Hernández, C. Rivera +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Nonlinear Waves and Solitons
paper · pdf · doi:10.48550/arxiv.2412.08852
openalex publication_date 2024/12/12 · openalex created_date 2024/12/14 · openalex updated_date 2026/07/28
In this work we constrain the value of σ8 for the normal and self-accelerating branch of a DGP brane embedded in a five-dimensional Minkowski space-time. For that purpose we first constrain the model parameters H0, Ωm0, Ωr0 and M by means of the Pantheon+ catalog and a mock catalog of gravitational waves. Then, we solve numerically the equation for dark matter scalar perturbations using the dynamical scaling solution for the master equation and assuming that p=4 for the matter dominated era. Finally, we found that the evolution of matter density perturbations in both branches is different from the ΛCDM model and that the value of σ8=0.774±0.027 for the normal branch and σ8=0.913±0.032 for the self-accelerating branch.