A two-scalar model for a small but nonzero cosmological constant

Details A two-scalar model for a small but nonzero cosmological constant A two-scalar model for a small but nonzero cosmological constant

1999-08-06

arxiv.org/abs/gr-qc/9908021v1

Phys.Rev. D62 (2000) 064004

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages plus 7 figures

Scientific paper

10.1103/PhysRevD.62.064004

We revisit a model of the two-scalar system proposed previously for understanding a small but nonzero cosmological constant. The model provides solutions of the scalar-fields energy $\rho_s$ which behaves truly constant for a limited time interval rather than in the way of tracker- or scaling-type variations. This causes a mini-inflation, as indicated by recent observations. As another novel feature, $\rho_s$ and the ordinary matter density $\rho_m$ fall off always side by side, but interlacing, also like (time)$^{-2}$ as an overall behavior in conformity with the scenario of a decaying cosmological constant. A mini-inflation occurs whenever $\rho_s$ overtakes $\rho_m$, which may happen more than once, shedding a new light on the coincidence problem. We present a new example of the solution, and offer an intuitive interpretation of the mechanism of the nonlinear dynamics. We also discuss a chaos-like nature of the solution.

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