@article {ZIMDAHL2020100681,
	title = {On (non-)dynamical dark energy},
	journal = {Physics of the Dark Universe},
	volume = {30},
	year = {2020},
	pages = {100681},
	abstract = {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.},
	issn = {2212-6864},
	doi = {https://doi.org/10.1016/j.dark.2020.100681},
	url = {http://www.sciencedirect.com/science/article/pii/S2212686420303125},
	author = {Zimdahl, Winfried and J{\'u}lio C. Fabris and Velten, Hermano and Ram{\'o}n Herrera}
}
