Together with a collaborator from UAM-IFT (Madrid), Juan Garcia-Bellido, we have recently published an article in the French science outreach magazine Pour la Science, entitled Matière noire: la piste des trous noirs. This article is available here. For the original English version, published in the Scientific American, see here.
In this article,  we review and explain the recent observations pointing towards the possilbe existence of massive primordial black holes, born less than one milli-second after the Big-Bang. Such primordial black holes could explain the origin of the Dark Matter in the Universe and provide the seeds of the super-massive black holes at the center of galaxies. Finding a firm observational evidence for even a single primordial black hole would revolutionize our understanding of the early Universe, and might help to resolve long-standing problems of cosmology and astrophysics.