Europhys. Lett., 61 (5) , pp. 715-720 (2003)
Time-dependent cosmological constant in the Jackiw-Teitelboim cosmologyM. Alves1, J. Barcelos-Neto1, M. Novello2 and J. M. Salim2
1 Instituto de Física, Universidade Federal do Rio de Janeiro - RJ 21945-970, Brazil
2 Centro Brasileiro de Pesquisas Físicas - Rua Dr. Xavier Sigaud 150 Urca 22290-180 Rio de Janeiro, RJ, Brazil
(Received 6 September 2002; accepted in final form 20 December 2002)
We study the obtainment of a time-dependent cosmological constant at D=2 in a model based on the Jackiw-Teitelboim cosmology. We show that the cosmological term goes to zero asymptotically and can induce a nonsingular behavior at the origin.
98.80.Bp - Origin and formation of the Universe.
98.80.Cq - Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.).
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