Gauss Bonnet cosmologies: crossing the phantom divide and the transition from matter dominance to dark energy
Abstract
Dark energy cosmologies with an equation of state parameter w less than 1 are often found to violate the null energy condition and show unstable behaviour. A solution to this problem may require the existence of a consistent effective theory that violates the null energy condition only momentarily and does not develop any instabilities or other pathological features for a late time cosmology. A model which incorporates a dynamical scalar field phiv coupled to the quadratic Riemann invariant of the Gauss Bonnet form is a viable proposal. Such an effective theory is shown to admit nonsingular cosmological evolutions for a wide range of scalar Gauss Bonnet coupling. We discuss the conditions for which our model yields observationally supported spectra of scalar and tensor fluctuations, under cosmological perturbations. The model can provide a reasonable explanation for the transition from matter dominance to dark energy regime and the late time cosmic acceleration, offering an interesting testing ground for investigations of the cosmological modified gravity.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 May 2007
 DOI:
 10.1088/14757516/2007/05/019
 arXiv:
 arXiv:hepth/0702002
 Bibcode:
 2007JCAP...05..019L
 Keywords:

 High Energy Physics  Theory;
 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 44 pages, several eps figures