On (non-)dynamical dark energy.
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2020
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The current Universe is composed by a mixture of relativistic species, baryonic matter, dark matter
and dark energy which evolve in a non-trivial way at perturbative level. An advanced description
of the cosmological dynamics should include non-standard features beyond the simplistic approach
idealized by the standard cosmology in which cosmic components do not interact, are adiabatic
and dissipationless. We promote a full perturbative analysis of linear scalar perturbations of a non-
interacting cosmological model containing baryons, dark matter (both pressureless) and a scalar field
allowing for the presence of relative entropic perturbations between the three fluids. Assuming an
effective scalar-field sound speed equal to one and neglecting anisotropic stresses we establish a new
set of equations for the scalar cosmological perturbations. As a consequence of this new approach,
we show that tiny departures from a constant scalar field equation of state wS = −1 damage
structure formation in a non-acceptable manner. Hence, by strongly constraining wS our results provide
compelling evidence in favor of the standard cosmological model and rule out a large class of dynamical
dark energy models.
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WILHELM, Z. W. E. et al. On (non-)dynamical dark energy. Physics of the Dark Universe, v. 30, artigo 100681, 2020. Disponível em: <https://www.sciencedirect.com/science/article/pii/S2212686420303125?via%3Dihub>. Acesso em: 06 jul. 2022.