From left: Marianna Gailus (Sylvia) and Cillian O'Sullivan (Ted) in "Sylvia Sylvia Sylvia" at Geffen Playhouse (Photo by Jeff Lorch) Rising playwright Beth Hyland’s “Sylvia Sylvia Sylvia,” having its world premiere at Geffen Playhouse, is just what you’d want in a new play — ambitious and compelling in a well staged and performed production. Bringing to life poets Sylvia Plath and Ted Hughes as they affect a current writer and her husband, the play challenges expectations in