Extending the generalized Chaplygin gas model by using geometrothermodynamics
Abstract
We use the formalism of geometrothermodynamics to derive fundamental thermodynamic equations that are used to construct general relativistic cosmological models. In particular, we show that the simplest possible fundamental equation, which corresponds in geometrothermodynamics to a system with no internal thermodynamic interaction, describes the different fluids of the standard model of cosmology. In addition, a particular fundamental equation with internal thermodynamic interaction is shown to generate a new cosmological model that correctly describes the dark sector of the Universe and contains as a special case the generalized Chaplygin gas model.
- Publication:
-
Physical Review D
- Pub Date:
- September 2012
- DOI:
- 10.1103/PhysRevD.86.063508
- arXiv:
- arXiv:1203.4637
- Bibcode:
- 2012PhRvD..86f3508A
- Keywords:
-
- 98.80.-k;
- 98.80.Jk;
- 95.36.+x;
- 95.35.+d;
- Cosmology;
- Mathematical and relativistic aspects of cosmology;
- Dark energy;
- Dark matter;
- General Relativity and Quantum Cosmology;
- Astrophysics - Cosmology and Extragalactic Astrophysics
- E-Print:
- 18 pages, 7 figures. Section added: Basics aspects of geometrothermodynamics