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Research Interests

As far as we know dark matter does not take part in electro-magnetic interaction, and thus cannot be observed directly in the light. However, with the help of numerical simulations, we are able to predict the distribution of dark matter under gravity. Small perturbations in the dark matter component have now grown into large and dense clumps called dark matter halos. These dark matter halos with deep gravitational potential can bend the light passing through and distort the image of galaxies lying behind, the so called gravitational lensing effect. With the dark matter halos traced by galaxy groups in the GAMA survey plus the distortion measurement of galaxy shapes in the SDSS survey, we can study in detail the dark matter environment of galaxy groups and their relation to galaxy properties via weak lensing.

Because of the high concentration of dark matter, halos are also sites with high gamma-ray emission from dark matter annihilation, as predicted by most SUSY dark matter particle models. Small density structure called dark matter subhalos, revealed by high resolution numerical simulations, significantly boost the annihilation signal in cluster halos. Aided with detailed cluster annihilation emission profile motivated from high resolution simulations, we look into the gamma ray images from Fermi-LAT telescope to detect dark matter annihilation.

Conferences and Workshops