His doctoral dissertation (2003) analysed the genre of historical documentary film, with detailed analyses of some fifteen documentaries. The main argument of the study is that the maker of historical documentaries constantly negotiates between cognitive, moral, and aesthetic demands.
In other studies, Ludvigsson has investigated various modern uses of the past, including political uses of the Holocaust, and how humour interacts with history in historical comedy film.
History teaching and learning
He has paid special attention to issues related to history teaching and learning, including student perceptions of fieldwork and the views of student teachers on the subject of history. Currently,Ludvigsson is investigating the debate on education that took place in Sweden in the 1840s, i.e. a period in time that saw both numerous new newspapers and major educational reform.
The role of guides and heritage
Further, in a project financed by the the Swedish National Heritage Board, he and colleagues Lasse Kvarnström and Bodil Axelsson are investigating the role(s) of guides in the cultural heritage sector.