Timur Doumler (AIP)

Constrained Local Universe simulations from galaxy peculiar velocities
When Jun 01, 2012 from 10:30 AM to 12:00 PM
What
  • Colloquium
Where SH, Lecture hall
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Numerical simulations are a powerful tool to study the formation and evolution of the large-scale structure of the Universe in the cosmological context. With the Constrained Realizations method it is possible to create simulations that faithfully reproduce the large-scale structure of the observed Local Universe. The crucial step is to generate appropriate initial conditions for these simulations from the available observational data. Our approach is to use galaxy peculiar velocities, which can be derived from galaxy redshifts and independent measurements of their distance.

In this talk, I will describe recent improvements on this technique, which take into account the non-linear evolution of the cosmic matter distribution. By applying a Lagrangian reconstruction to the peculiar velocities, we reconstruct the displacements and initial positions of observed galaxies. In this way we can generate a significantly better estimate of the initial conditions of the Local Universe.