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Dr Katarina Markovic

Research Fellow

Katarina Markovic


I'm a postdoc at the ICG at Portsmouth University working on Euclid.

I did my PhD with the International Max Planck Research School in February 2013 in the Physical Cosmology group at the University Observatory Munich, where my supervisor was Prof. Jochen Weller and my thesis was titled Constraining Cosmology in the Non-linear Domain: Warm Dark Matter.

Research Interests

Large Scale Structure - Inflation generates perturbations in the primordial energy density in the universe. The evolution of the ampitudes of these pertubations go through several phases and eventually become too large to be treated with linear perturbation theory. As they become non-linear their shapes distort and they become the inhabitable structures of today's universe. This evolution is very complex and so, many different tools and models have been developed to study them and ultimately to use them to test our cosmological theories.

Cosmic Shear - The cumulative weak gravitational lensing of the images of very distant galaxies by all intervening dark matter structures is a very promising probe of the statistics of the distribution of all matter in the universe. Cosmic shear as a probe has the advantage of not requiring the assumption of how luminous and dark matter are coupled in cosmic structures.

Warm Dark Matter - If dark matter particles are relatively light (mass of the order of a few keV), then they may be able to remain at relativistic speeds in the early universe long enough to erase significantly large primordial density perturbations - this is called free-streaming. The signature of this smoothing depends on the mass of the particle as well as on whether all of dark matter consists of such particles. Such a signature may be observable today, in the statistics of the distribution of large scale structure on up to galaxy-sized scales.

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