Statefinder Diagnostic for Quintessence with or Without Thermal Interaction
Abstract
The cosmological dynamics of a minimally coupled scalar field that couples to the background matter with thermal interactions is investigated using statefinder diagnostics. The time evolution of the statefinder pairs {r, s} and {r, q} are obtained under the circumstance that different values of model parameters are chosen. We show that the thermal coupling term does not affect the location of the late-time attractor, but exerts an influence on the evolution of the statefinder parameters. The most notable feature of the r-s plane for the thermal coupling model, which is distinguished from the other dark energy models, is that some part of the curve with thermal coupling can form a closed loop in the second quadrant (r > 1, s < 0).
- Publication:
-
International Journal of Modern Physics D
- Pub Date:
- 2009
- DOI:
- 10.1142/S0218271809014261
- arXiv:
- arXiv:0803.4039
- Bibcode:
- 2009IJMPD..18...43L
- Keywords:
-
- Statefinder diagnostic;
- thermal interaction;
- dark energy;
- Astrophysics
- E-Print:
- 10 pages, 6 figures, accepted for publication in IJMPD