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Dynamical analysis approaches in spatially curved FRW spacetimes
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SYSNO ASEP 0539440 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Dynamical analysis approaches in spatially curved FRW spacetimes Author(s) Kerachian, M. (CZ)
Acquaviva, G. (CZ)
Lukes-Gerakopoulos, Georgios (ASU-R) ORCIDSource Title Proceedings of RAGtime 20/22: Workshops on black holes and neutron stars. - Opava : Silesian University, 2020 - ISBN 978-80-7510-433-5 Pages s. 133-143 Number of pages 11 s. Publication form Online - E Action RAGtime /20.-22./ Event date 15.10.2018 - 19.10.2018 VEvent location Opava Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords gravitation ; cosmology ; dynamical systems Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) Institutional support ASU-R - RVO:67985815 Annotation 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. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2022
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