We propose a cosmological model containing a cosmological term in arbitrary gauge in Lyra's geometry. In the absence of matter fields (such as radiation or baryonic), a constant cosmological term does not lead to the de Sitter universe as it is seen in Riemannian geometry, while a time-varying cosmological term can drive the universe into an accelerated expansion. PACS Nos.: 98.80.-k, 98.80.Jk.Résumé : Nous proposons un modèle cosmologique contenant un terme cosmologique dans une jauge arbitraire en géométrie de Lyra. En l'absence de champs de matière (de radiation ou de baryons), un terme cosmologique constant ne mène pas à un univers de de-Sitter, comme on le voit en géométrie de Riemann, alors qu'un terme cosmologique variant dans le temps peut mener l'univers à une expansion accélérée. [Traduit par la Rédaction]
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