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• W3100733245 endingPage "1950019" @default.
• W3100733245 startingPage "1950019" @default.
• W3100733245 abstract "Future singularities arising in a family of models for the expanding Universe, characterized by sharing a convenient parametrization of the energy budget in terms of the deceleration parameter, are classified. Finite-time future singularities are known to appear in many cosmological scenarios, in particular, in the presence of viscosity or non-gravitational interactions, the last being known to be able to suppress or just change in some cases the type of the cosmological singularity. Here, a family of models with a parametrization of the energy budget in terms of the deceleration parameter are studied in the light of Gaussian processes using reconstructed data from $40$-value $H(z)$ datasets. Eventually, the form of the possible non-gravitational interaction between dark energy and dark matter is constructed from these smoothed $H(z)$ data. Using phase space analysis, it is shown that a non-interacting model with dark energy $omega_mathrm{de} = omega_{0} + omega_{1}q$ ($q$ being the deceleration parameter) may evolve, after starting from a matter dominated unstable state, into a de Sitter Universe (the solution being in fact a stable node). Moreover, for a model with interaction term $Q = 3 H b rho_mathrm{dm}$ ($b$ is a parameter and $H$ the Hubble constant) three stable critical points are obtained, what may have important astrophysical implications. In addition, part of the paper is devoted to a general discussion of the finite-time future singularities obtained from direct numerical integration of the field equations, since they appear in many cosmological scenarios and could be useful for future extended studies of the models here introduced. Numerical solutions for the new models, produce finite-time future singularities of Type I or Type III, or an $omega$-singularity, provided general relativity describes the background dynamics." @default.
• W3100733245 created "2020-11-23" @default.
• W3100733245 creator A5025687672 @default.
• W3100733245 creator A5026447224 @default.
• W3100733245 creator A5072829292 @default.
• W3100733245 date "2019-01-01" @default.
• W3100733245 modified "2023-10-18" @default.
• W3100733245 title "Cosmological singularities in interacting dark energy models with an ω(q) parametrization" @default.
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• W3100733245 doi "https://doi.org/10.1142/s0218271819500196" @default.
• W3100733245 hasPublicationYear "2019" @default.
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