I am a de Sitter fellow working on how to constrain modified gravity and dark sector models using galaxy clusters, weak lensing, and gravitational waves.

During the fall semester, I am a teaching assistant for the course Physics of Elementary Particles.


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

Cañas-Herrera, Contigiani, Vardanyan 2019 - O. Contigiani 2019
GW magnification notebook

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

Marchetti et al. 2017 - Contigiani et al. 2018
population code

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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