Ingemar Bengtsson

My name is Ingemar Bengtsson, and I have been a lecturer at Fysikum in Stockholm since '93 (and a professor since '00). My previous "career" was at Chalmers, CERN and Imperial College.

This is me (as drawn by Jörgen Hansson in '73)
The research areas that I like the best usually have something to do with geometry. General relativity is a favourite. Most of my work there is on black holes. My strongest prejudice is that the world has four dimensions; this is the direction in which I look for clues about quantum gravity. Then I work on quantum information theory, since the geometry of the space of quantum states is wonderful and rather mysterious. What I find fascinating about relativity and quantum mechanics---as it happens, the two deepest theories we have---is that their basic equations have been around for almost a hundred years, and yet they keep springing conceptual surprises on us. I am looking for the next surprise there, but I do keep a weather eye open on other subjects as well.

The things that are on my mind at the moment are Penrose inequalities, quasi-local mass, complementary measurements in quantum mechanics, and the existence of special sets of equiangular vectors in Hilbert space (this translates in the laboratory into a very special kind of measurement, and in mathematics to Hilbert's 12th problem).

I am told that some scientists think that there is something queer going on in the Universe while others, on the whole, don't. I tend towards the former viewpoint, but this is probably not apparent from my published papers. Some examples of those are: