The Logotropic Dark Fluid as a unification of dark matter and dark energy
Pierre-Henri Chavanis

TL;DR
This paper introduces a logotropic dark fluid model unifying dark matter and dark energy, matching cosmological observations and explaining galactic phenomena with a single equation of state.
Contribution
It proposes a novel logotropic equation of state for dark fluid, unifying dark matter and dark energy, and explains galactic and cosmological observations.
Findings
Model matches $ ext{LCDM}$ observational constraints
Predicts a universal dark matter halo surface density
Reproduces observed dwarf galaxy masses
Abstract
We propose a heuristic unification of dark matter and dark energy in terms of a single dark fluid with a logotropic equation of state , where is the rest-mass density, is the Planck density, and is the logotropic temperature. The energy density is the sum of a rest-mass energy term mimicking dark matter and an internal energy term mimicking dark energy. The logotropic temperature is approximately given by , where is the cosmological density. More precisely, we obtain that we interpret as a fundamental constant. At the cosmological scale, this model fullfills the same observational constraints as the CDM model. However, it has…
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