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Qualitative behaviour of gravitational perturbations in Chaplygin Gas - Unifying Dark Matter and Dark Energy

J. P. M. de Carvalho, R. A. A. Fernandes

Two unified models of dark matter (DM) and dark energy (DE) are analysed, namely the Generalized Chaplygin Gas and the Modified Chaplygin Gas models. We study the qualitative behaviour of gravitational perturbations in both models, analysing their dynamical systems which describe the linear density perturbations, and graphically show the wavenumber, or k-dependence of the solutions. Finally we compare the two models and try to conclude which of them is close to available observations.

Journal of Physics: Conference Series

IOP Publishing Ltd
Volume 1269, Number 0120
2019 July

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia