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 a century, 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, black hole lattices, 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:

Of course, not all my papers are published.

If any youngster wants to see what a "preprint" used to look like, here is one:

With Karol Zyczkowski from Krakow I have written a book on quantum mechanics, seen through our eyes. The Cambridge University Press published the second edition in 2017:

I occasionally try to write popular science articles. They are all in Swedish:

If you want to hear me trying to explain gravity (på svenska), you can do it from home.

In the department I am a member of the "KOMKO" group, which includes the (informal) Relativity group (it has a little homepage of its own) and the group for Quantum Information and Quantum Optics. Also, Edwin Langmann (KTH) and I are organizing a weekly seminar in Mathematical Physics (on Thursdays at 11 o'clock).

My views on teaching happen to be identical to those of Fred Hoyle, as expressed in "
The Universe: Past and present reflections " (Ann. Rev. Astr. Astrophys. 1982), so there is no need to repeat them here.

This academic year I teach Electrodynamics I, Introduction to Quantum Information and Quantum Computing, and (as it turns out) Analytical Mechanics.

· Elektrodynamik I. The book for the course is no less than that of J. D. Jackson, 3d ed. The course program for 2018 is on the course homepage . The lecture notes below have just a little to do with this course.

· Kvantinformation och kvantdatorer. Based on the book by Stenholm and Suominen: Quantum Approach to Informatics. For more information see the course homepage .

· Avancerad allmän relativitetsteori. The emphasis of this course was on gravitational collapse, black holes, and the like. It will not be given this year, but I leave the link to the homepage .

· Analytisk mekanik. I'm teaching this as an emergency measure. Information about the course is on the course homepage .

I enjoy supervising Master's Theses and such things. I have made a little collection of all theses that I saved the pdf files for on a special thesis page.

Examples of lecture notes:


My present graduate students are Ole Andersson and Irina Dumitru.

My Erdös number is 3. My Einstein number is 4. And one more thing. A quote from James Lovelock, which I have had occasion to think about, quite some time ago actually:

"Of all the prizes that come from surviving more than fifty years, the best is the freedom to be eccentric."

Many years later in Meknes. Photograph by Adan Cabello.


Email:

ibeng@fysik.su.se
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