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SUMMARY:Understanding the dark Universe with observational cosmology - Mar
 ika Asgari\, University of Edinburgh
DTSTART:20200608T120000Z
DTEND:20200608T130000Z
UID:TALK141436@talks.cam.ac.uk
CONTACT:David Stefanyszyn
DESCRIPTION:Cosmology is a new and fast growing field\, owing this growth 
 to both new technology and statistical methods in imaging and data process
 ing. It is believed that we can explain the cosmology of the entire Univer
 se using a handful of parameters through the standard cosmological model. 
 This model has been very successful in predicting the distribution of gala
 xies and matter\, as well as very early measurements of cosmic microwave b
 ackground radiation. As the volume of data is growing we are starting to s
 ee cracks in this simple picture of the Universe\, through tensions betwee
 n the results of different observational analyses. \n\nIn this talk I will
  focus on the analysis of the data from the kilo degree survey (KiDS). KiD
 S is a purpose-built gravitational lensing survey with high quality images
  and a wide photometric coverage\, resulting in very high fidelity data. T
 his dataset\, therefore\, provides an excellent playground where we can te
 st our methods in preparation for future weak lensing surveys. Already the
  first 450 degrees of the KiDS data shows a mild tension with CMB results 
 from the Planck satellite\, which has sparked both skepticism and exciteme
 nt within the community. I will go through the systematics that can affect
  the results and methods to mitigate them. I will also show results from t
 he combination of KiDS and the dark energy survey (DES). Combining probes 
 of cosmology can break degeneracies in the parameter space\, resulting in 
 tighter constraints. I will finally show results for the combination of Ki
 DS with spectroscopic galaxy surveys.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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