The discovery of the accelerated universe keeps receiving a well deserved attention. On November 9, the Breakthrough Prize Foundation announced the recipients of the 2015 Breakthrough Prize in Fundamental Physics
In February this year the iPTF (intermediate Palomar Transient Factory) program was started.
This is a survey searching for optical transients using a robotic 1.2 meter telescope in California, and the Oskar Klein Centre is one of the participating institutes for the next 2 years. The aim is to discover transients – in particular supernovae – at an earlier stage than hitherto possible, hopefully within hours after the explosion. The concrete scientific question we want to address is the nature of the progenitor systems of supernovae, and this requires very early observations of these explosions, before the memory of the initial configuration gets lost.
We continue our interview series of Oskar Klein Centre fellows. Today we meet Martin Sahlén, starting his third year around. Martin works in the CoPS, Cosmoparticle Physics Group.
When did you start working for the OKC, and how it is going so far?
arrived at the Oskar Klein Centre in September 2009, and it has been both enjoyable and stimulating. Much of my time has
Galaxy clusters occupy a central role in the ongoing efforts to understand some of the greatest questions in particle astrophysics and cosmology: the nature of Dark Matter and Dark Energy. Moreover, these huge mass concentrations serve as Nature’s own telescopes, capable of amplifying faint high-redshift sources that would otherwise be beyond our reach. At the same time, the use of galaxy clusters as probes for fundamental physics requires a good understanding of the state of the intra-cluster medium.
This spring there have been several PhD theses defenses here at the Oskar Klein Center, and as much as we hate saying good bye to some of our best students, we are proud to have been part of their professional lives. Jakob Nordin, Sara Rydbeck, Yashar Akrami, Teresa Riehm and Henrik Johansson defended their theses this spring. We wish them all the best for their future life!
During the last three weeks, we were visited by an impressive list of cosmologists trying to make sense of what is driving the present accelerated expansion of the Universe. Recent observations suggest that we are approaching a de Sitter phase