Professor of physics and Member of the Royal Swedish Academy of Sciences. Secretary
of the Nobel Committee for Physics. Broad interests in particle and astroparticle physics.
Title: The mystery of the Dark Matter of the Universe.
Abstract: More than 80 % of the mass in the Universe seems to be missing.
The need for this invisible, or dark, matter was first noted by Zwicky
already in 1933, and has recently been more convincingly shown by data from
the Planck satellite. But what is it? I will show how we hope to
successively narrow down the possibilities by a combination of various novel
experiments, guided by theory. Some interesting recent hints of dark matter
signals will also be reviewed.