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SÃ©minaires, soutenances

Measuring the growth rate of structure around cosmic voids

par Adam Hawken (CPPM)

9111 (Dpt Physique)


Dpt Physique


The cosmic web can be split into different component structures that show different properties, namely nodes (clusters), filaments, walls, and voids. Cosmic voids are the most underdense regions of the universe, and compose most of its volume. A galaxy in or close to the edge of a void is probably being evacuated away from the void centre, falling onto the surrounding structure under the influence of gravity. These redshift space distortions (RSD) introduce an anisotropy to the void-galaxy cross-correlation function. If all anisotropy in the void-galaxy cross-correlation function arises via RSD, and the relationship between the velocity and density fields is understood, then it is possible to measure the growth rate of cosmic structure by analysising the void-galaxy cross-correlation function. In this talk I shall present a review of cosmic void science in general and void RSD in particular. I shall compare results from using different methodologies and discuss on going work forecasting constraints from future experiments.