Speaker
SANTIAGO GARCIA SERNA
Description
In the framework of Horndesky theories, we evaluate the validity and consistency of the Quasi-Static and Sub-Horizon Approximations (QSA–SHA) in the study of cosmological perturbations. By applying these approximations, we determine the corresponding gravitational potentials and compare them with the results obtained from standard perturbative treatments. This analysis allows us to identify the leading 0 order $\mathcal{O}(0)$ terms that dominate the dynamics on large scales, providing the necessary conditions for accurate numerical integrations within modified gravity scenarios.
Authors
Cesar A. Valenzuela-Toledo
(Departamento de Física, Universidad del Valle)
JOHN BAYRON ORJUELA-QUINTANA
(UNIVERSIDAD DEL VALLE)
SANTIAGO GARCIA SERNA
