2026-04-13T06:58:00Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/1851852025-12-05T16:51:10Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917
RECERCAT
author
Pons Ràfols, Josep Maria
author
Talavera Sánchez, Pedro
2022-04-26T17:12:14Z2022-04-26T17:12:14Z20212022-04-26T17:12:15Z
We find an exact convergence in the local dynamics described by two supposedly antagonistic approaches in modern cosmology: one starting from an expanding universe perspective such as FLRW, the other based on a local model ignoring any notion of expansion, such as Schwarzschild dS. Both models are in complete agreement when the local effects of the expansion are circumscribed to the presence of the cosmological constant. We elaborate in the relevant role of static backgrounds like the Schwarzschild-dS metric in standard form as the most proper coordinatizations to describe physics at the local scale. Finally, making use of an old and too often forgotten relativistic kinematical invariant, we clarify some widespread misunderstandings on space expansion, cosmological and gravitational redshifts. As a byproduct we propose a unique and unambiguous prescription to match the local and cosmological expression of a specific observable.
cc-by (c) Pons Ràfols, Josep Maria, et al., 2021 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess
Cosmologia
Efecte de Doppler
Univers
Cosmology
Doppler effect
Universe
On cosmological expansion and local physics
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion