The unphysical character of minimally coupled dark energy fluids

It is well known that, in the context of general relativity, an unknown kind of matter that must violate the strong energy condition is required to explain the current accelerated phase of expansion of the Universe. This unknown component is called dark energy and is characterized by an equation of...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2019-04, Vol.79 (4), p.1-8, Article 356
Main Authors: Duarte, Ronaldo C., Barboza, Edésio M., Abreu, Everton M. C., Neto, Jorge Ananias
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Dark energy
Elementary Particles
Energy (Physics)
Equations of state
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
Relativity
String Theory
Thermodynamics
Universe
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Summary:It is well known that, in the context of general relativity, an unknown kind of matter that must violate the strong energy condition is required to explain the current accelerated phase of expansion of the Universe. This unknown component is called dark energy and is characterized by an equation of state parameter w = p / ρ with w 0 < - 1 / 3 . For minimally coupled dark energy fluids, thermodynamic stability requires that 3 w - d ln | w | / d ln a ≥ 0 and positiveness of entropy that w ≥ - 1 . In this paper we proof that we cannot obtain a differentiable function w ( a ) to represent the dark energy that satisfies these conditions during the entire history of the Universe.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-019-6876-3