What can we learn from averaging cosmological observables in different environments?  [slides]

David Caro building, Level 7 conference room

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Yuxiang Qin

  • Dr IxanDra Achitouv
    Dr IxanDra Achitouv, Postdoctoral fellow
    Swinburne University

    Email: iachitouv[at]swin.edu.au

Abstract

In this talk, I will give an overview of 3 different aspects of my research exploring cosmological physics as a function of environment. First, I will demonstrate how baryon acoustic oscillation (BAO) measurements of cosmic distances can be improved by optimally-weighting the signal as a function of environment. Second, I will discuss how underdense regions provide interesting tests of the cosmological model, and how we can constrain departures from GR in void profiles using Monte Carlo random walks. Finally, I will discuss tests of gravitational physics by measuring the growth rate of large-scale structure in different environments. In particular I will present the first constraint from the void-galaxy cross correlation function in the 6dF Galaxy Survey.

What can we learn from averaging cosmological observables in different environments?