My main research interest is theoretical cosmology, with a current focus on observational tests of dark energy and modified gravity. I am a co-coordinator of the ESA Euclid satellite theory group, and I was a core-team member of the ESA Planck satellite. I am also working on large scale structure, the CMB and topological defects, and have worked on non-Gaussianity, inflation and more generally the early universe.

Most of my publications can be found on on the arXiv, and are listed on inspirehep.net, or you can try google scholar. I also have a more or less up-to-date publication list (pdf, 161kB).

The following picture shows a combination of the ESA Planck reconstruction of magnetic field lines and dust emission at 353GHz as the sky of van Gogh's painting ``starry night'':