Short introduction to dark matter

Who: Jussi Virkajärvi (CP3-Origins)
When: Wednesday, February 26, 2014 at 16:15
Where: U49E

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A massive cluster of yellowish galaxies, seemingly caught in a red and blue spider web of eerily distorted background galaxies, makes for a spellbinding picture from the new Advanced Camera for Surveys aboard NASA's Hubble Space Telescope. To make this unprecedented image of the cosmos, Hubble peered straight through the center of one of the most massive galaxy clusters known, called Abell 1689. The gravity of the cluster's trillion stars — plus dark matter — acts as a 2-million-light-year-wide lens in space. This gravitational lens bends and magnifies the light of the galaxies located far behind it. Some of the faintest objects in the picture are probably over 13 billion light-years away (redshift value 6). Credit: NASA, N. Benitez (JHU), T. Broadhurst (Racah Institute of Physics/The Hebrew University), H. Ford (JHU), M. Clampin (STScI),G. Hartig (STScI), G. Illingworth (UCO/Lick Observatory), the ACS Science Team and ESAAbstract:
The first half of the lecture considers the basic astrophysical observations, that lead to the so called missing mass/dark matter problem, and the other cosmological evidences, that support the existence of dark matter. The possible solutions to the dark matter problem are also shortly discussed.
On the second half of the lecture I concentrate on particle dark matter scenario, particularly on WIMP paradigm, and I briefly review how the particle dark matter could possibly be observed.