Extensions of modified Chaplygin gas from Geometrothermodynamics

We derive modified classes of Chaplygin gas by using the formalism of Geometrothermodynamics. In particular, our strategy gives us extended versions of Chaplygin gas, providing a novel thermodynamic explanation. Thus, we show that our models correspond to systems with internal thermodynamic interact...

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Bibliographic Details
Published inThe European physical journal. C, Particles and fields Vol. 79; no. 7; pp. 1 - 9
Main Authors Benaoum, Hachemi B., Luongo, Orlando, Quevedo, Hernando
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2019
Springer
Springer Nature B.V
SpringerOpen
Subjects
Analysis
Astronomy
Astrophysics and Cosmology
Chaplygin gas
Dark energy
Domains
Elementary Particles
Growth factors
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Red shift
Regular Article - Theoretical Physics
String Theory
Thermodynamics
Universe
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Summary:We derive modified classes of Chaplygin gas by using the formalism of Geometrothermodynamics. In particular, our strategy gives us extended versions of Chaplygin gas, providing a novel thermodynamic explanation. Thus, we show that our models correspond to systems with internal thermodynamic interaction. Bearing this in mind, we find new free parameters which are derived from thermodynamics and we give them an interpretation. To this end, we predict the range of values that every term can take in the context of homogeneous and isotropic universe. We also show that our new versions of modified Chaplygin gas can be interpreted as unified dark energy models, independently from the introduction of our new additional terms. Finally, we compare our theoretical scenarios through a fit on a grid based on the Union 2.1 compilation and we evaluate the growth factor of small perturbations. In this respect, we show that our model better adapts to the theoretical Λ CDM value, namely γ Λ C D M = 6 11 , than previous versions of modified Cgaplygin gas. We show numerical constraints at late and early redshift domains, which turn out to be compatible with previous results on standard versions of Chaplygin gas models.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-019-7086-8