Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 16, Issue 7, Pages 1109-1117Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271807010614
Keywords
dark energy; dilaton; coupled quintessence; omega-omega ' plane; attractor
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In this paper, we regard the dilaton in Weyl-scaled induced gravitational theory as a coupled quintessence. Based on this consideration, we investigate the dilaton coupled quintessence (DCQ) model in the omega-omega ' plane, which is defined by the equation of state parameter for the dark energy and its derivative with respect to N (the logarithm of the scale factor a). We find the scalar field equation of motion in the omega-omega ' plane, and show mathematically the properties of attractor solutions which correspond to omega(sigma) similar to -1, Omega(sigma) = 1. Finally, we find that our model is a tracking one which belongs to freezing type models classified in the omega-omega ' plane.
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