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The scalar and electromagnetic fields produced by the geodesic and uniformlyaccelerated discrete charges in de Sitter spacetime are constructed byemploying the conformal relation between de Sitter and Minkowski space.  A special attention is paid to new effects arising in spacetimes which, likede Sitter space, have spacelike conformal infinities. Under the presence ofparticle and event horizons, purely retarded fields (appropriately defined)become necessarily singular or even cannot be constructed at the "creationlight cones" -- future light cones of the "points" at which the sources "enter"the universe. We construct smooth (outside the sources) fields involving bothretarded and advanced effects, and analyze the fields in detail in case of (i)scalar monopoles, (ii) electromagnetic monopoles, and (iii) electromagneticrigid and geodesic dipoles.Comment: 36 pages, 5 figures, LaTex2e; minor misprints corrected, one  reference added and some terminology change

Accelerated sources in de Sitter spacetime and the insufficiency of retarded fields