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SUMMARY:Sparse Sampling of Sky - Paniez Paykari (CEA-Saclay\, Paris)
DTSTART:20121127T163000Z
DTEND:20121127T173000Z
UID:TALK40732@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:The next generation of galaxy surveys will observe millions of
  galaxies over large volumes of the universe.  These surveys are expensive
  both in time and cost\, raising questions regarding optimal investment of
  this time and money.  In this work we investigate criteria for selecting 
 amongst observing strategies for constraining the galaxy power spectrum an
 d a set of cosmological parameters.  Depending on the parameters of intere
 st\, it may be more efficient to observe a larger\, but sparsely sampled\,
  area of sky instead of a smaller contiguous area.  In this work\, by maki
 ng use of the principles of Bayesian Experimental Design\, we will investi
 gate the advantages and disadvantages of the sparse sampling of the sky an
 d discuss the circumstances in which a sparse survey is indeed the most ef
 ficient strategy.  For the Dark Energy Survey (DES)\, we find that by spar
 sely observing the same area in a smaller amount of time\, we only increas
 e the errors on the parameters by a maximum of 0.4%.  Conversely\, investi
 ng the same amount of time as the original DES to observe a sparser but la
 rger area of sky we can in fact constrain the parameters with errors reduc
 ed by 28%.\n
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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