Constraining Logotropic Unified Dark Energy Models

Abstract

A unification of dark matter and dark energy in terms of a logotropic perfect dark fluid has recently been proposed, where deviations with respect to the standard $\Lambda \mathrm{CDM}$ model are dependent on a single parameter $B$. In this paper we show that the requirement that the linear growth of cosmic structures on comoving scales larger than $8h^{-1}\mathrm{Mpc}$ is not significantly affected with respect to the standard $\Lambda \mathrm{CDM}$ result provides the strongest constraint to date on the model ($B<6\times 10^{-7}$), an improvement of more than three orders of magnitude over previous constraints on the value of $B$. We further show that this constraint rules out the logotropic Unified Dark Energy model as a possible solution to the small scale problems of the $\Lambda$CDM model, including the cusp problem of Dark Matter halos or the missing satellite problem, as well as the original version of the model where the Planck energy density was taken as one of the two parameters characterizing the logotropic dark fluid.

5 pages

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Cited by in corpus (10)

• Effective field description of the Anton-Schmidt cosmic fluid
• Testing the equation of state for viscous dark energy
• Testing generalized logotropic models with cosmic growth
• Lagrangian description of cosmic fluids: mapping dark energy into unified dark energy
• Generalized Logarithmic Equation of State in Classical and Loop Quantum Cosmology Dark Energy-Dark Matter Coupled Systems
• The Logotropic Dark Fluid: Observational and Thermodynamic Constraints
• Assessing the foundation and applicability of some dark energy fluid models in the Dirac-Born-Infeld framework
• A new logotropic model based on a complex scalar field with a logarithmic potential
• Unifying the Dark Sector with the New Generalized Chaplygin Gas: Observational Constraints
• The Lambert $W$ equation of state in light of DESI BAO