Cosmic voids are vast underdense regions of space in the large scale structure, whose statistical properties we've only recently been able to fully utilize.
In particular, the distribution of galaxies around voids allows us to explore redshift-space distortions and use the Alcock-Paczyński effect to constrain the laws of gravity and the expansion history of the Universe.
In my talk I will discuss how we model the void-galaxy cross correlation function, and what caveats we will need to address to account for the increased constraining power of upcoming LSS surveys like Euclid.
Video: 3D visualisation of the cosmic web — viewing the universe as a set of discrete galaxies held together by gravity. Data are taken from Illustris Galaxy Simulation. Video credit: Kim Albrecht
This Friday colloquium will be hybrid. Attendees can therefore participate either in-person or via Zoom. Please join via Zoom at
https://uio.zoom.us/j/69001043754?pwd=cEJpbVE5ci9PdWNtRld2TDNNcGtKdz09
Meeting ID:690 0104 3754
Passcode: PeiseStua3
Attendees will be muted during the colloquium, but will have the opportunity to ask questions at the end by clicking on the "raise hand” button (or send a request via chat).