Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-22
Phys.Rev. D65 (2002) 083520
Astronomy and Astrophysics
Astrophysics
15 pages, LaTeX, 8 Figures. Minor changes in text, a discussion on initial conditions added (accepted in Phys.Rev.D)
Scientific paper
10.1103/PhysRevD.65.083520
We study the cosmological evolution of scalar fields that arise from a phase transition at some energy scale $\Lm_c$. We focus on negative power potentials given by $V=c\Lm_c^{4+n}\phi^{-n}$ and restrict the cosmological viable values of $\Lm_c$ and $n$. We make a complete analysis of $V$ and impose $SN1a$ conditions on the different cosmological parameters. The cosmological observations ruled out models where the scalar field has reached its attractor solution. For models where this is not the case, the analytic approximated solutions are not good enough to determine whether a specific model is phenomenologically viable or not and the full differential equations must be numerically solved. The results are not fine tuned since a change of 45% on the initial conditions does not spoil the final results. We also determine the values of $N_c, N_f$ that give a condensation scale $\Lm_c$ consistent with gauge coupling unification, leaving only four models that satisfy unification and SN1a constraints.
la Macorra Axel de
Stephan-Otto Christian
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