Quintessence, Cosmological Horizons, and Self-Tuning

Details Quintessence, Cosmological Horizons, and Self-Tuning Quintessence, Cosmological Horizons, and Self-Tuning

2001-05-23

arxiv.org/abs/hep-ph/0105251v2

JHEP 0108 (2001) 035

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pp., 5 figures; references added

Scientific paper

10.1088/1126-6708/2001/08/035

We point out that quintessence with an exponential potential V_0 exp(- beta phi / 3^{1/2} M_p) can account for the present observed acceleration of the universe, without necessarily leading to eternal acceleration. This occurs for 2.4 < beta < 2.8. Thus a cosmological horizon, which is supposed to be problematic within the context of string theory, can be avoided. We argue that this class of models is not particularly fine-tuned. We further examine this question in the context of a modified Friedmann equation, H^2 ~ rho + p, which is suggested by higher dimensional self-tuning approaches to the cosmological constant problem. It is shown that the self-tuning case can also be consistent with observations, if 1.8 < beta < 2.4. Future observations of high-z supernovae will be able to test whether beta lies in the desired range.

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