Splashback in galaxy clusters/ data & theory
Contigiani, Hoekstra, Bahe 2019 - Contigiani, Vardanyan, Silvestri 2019
lensing code - symmetron code
The boundary between recently accreted material and collapsed material around halos directly probes the dynamics of dark matter on cosmological scales. I work on 1) measuring the associated feature (splashback) using weak lensing, and 2) predicting the effects of modifications of gravity on this feature. I am also the PI of a wide-field photometric survey of around 40 massive clusters. The goal of the programme is to produce stringent constraints and to study of the phenomenology of splashback through comparison with N-body simulations.
Gravitational waves and large-scale structure/ forecast & theory
I work on two different aspects of the relation between GWs and the LSS: 1) the propagation of gravitational waves in the Universe is affected by structure along the line of sight, and 2) known gravitational wave sources are located inside galaxies, a biased tracer of the same structure. I work on the information content of the astrophysical GW background and the impact of gravitational lensing on the observed distribution of merging binaries.
On measuring the Galactic dark matter halo with hypervelocity stars/ theory
Hypervelocity stars are objects ejected from the Galactic Centre able to reach radial distances of tens of kpc. They are therefore a powerful tool to constrain the Milky Way's dark matter halo. Some initial work was part of my master's thesis (slides, thesis).
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