Název:
Dynamical analysis approaches in spatially curved FRW spacetimes
Autoři:
Kerachian, M. ; Acquaviva, G. ; Lukes-Gerakopoulos, Georgios Typ dokumentu: Příspěvky z konference Konference/Akce: RAGtime /20.-22./, Opava (CZ), 20181015
Rok:
2020
Jazyk:
eng
Abstrakt: We summarize two agnostic approaches in the framework of spatially curved Friedmann-Robertson-Walker (FRW) cosmologies discussed in detail in (Kerachian et al., 2020, 2019). The first case concerns the dynamics of a fluid with an unspecified barotropic equation of state (EoS), for which the only assumption made is the non-negativity of the fluid’s energy density. The second case concerns the dynamics of a non-minimally coupled real scalar field with unspecified positive potential. For each of these models, we define a new set of dimensionless variables and a new evolution parameter. In the framework of these agnostic setups, we are able to identify several general features, like symmetries, invariant subsetsand critical points, and provide their cosmological interpretation.
Klíčová slova:
cosmology; dynamical systems; gravitation Zdrojový dokument: Proceedings of RAGtime 20/22: Workshops on black holes and neutron stars, ISBN 978-80-7510-433-5