2018-12-102018-12-102009Hoffmann, N., Biswas, I. (2009). 'Poincaré families and automorphisms of principal bundles on a curve.' C. R. Acad. Sci. Paris 347, pp. 1285-1288. ISSN: 1631-073Xhttp://hdl.handle.net/10395/2530Poincaré families and automorphisms of principal bundles on a curve.Let C be a smooth projective curve, and let G be a reductive algebraic group. We give a necessary condition, in terms of automorphism groups of principal G-bundles on C, for the existence of Poincaré families parameterized by Zariski-open parts of their coarse moduli schemes. Applications are given for the moduli spaces of orthogonal and symplectic bundles.enghttps://doi.org/10.1016/j.crma.2009.10.006Poincaré familiesAutomorphismsPrincipal bundlesCurveArticle10.1016/j.crma.2009.10.006