Technical talks

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In prep. 

In prep. 

We review the evidence for a low value of S8 from cosmic shear. I will then argue that the discrepancy with the

Planck value of S8 may be a caused by uncertainties in the theoretical predictions for cosmic shear arising

from the modelling of the mass fluctuations on non-linear scales [Amon and Efstathiou 2022].

We present new measurements of the excess surface mass density profiles using the three state-of-the-art lensing surveys (DES, HSC, KiDS) and jointly analyse with BOSS galaxy clustering to assess their consistency on small and large-scales [Amon and Robertson et al 2022].

I co-pioneered the Lensing Without Borders cross-survey collaboration to test the consistency of weak lensing results [Amon+2017; Leauthaud & Amon+2021]

I was part of a small team preparing a note recommending target fields for commissioning, on behalf of the Dark Energy Science Collaboration [10].

Dark Energy Survey Year 3 Cosmology from Weak Lensing and Clustering 3x2pt: I played a pivotal role in the Dark Energy Survey Year 3 combined lensing and clustering cosmology analysis, leading the weak lensing results and coordinating three analysis teams to the most precise cosmological constraints of its kind [DES Collaboration 2021].

Dark Energy Survey Year 3 Cosmology from Cosmic Shear:  I led and coordinated the Dark Energy Survey Year 3 cosmic shear lensing analysis using the most powerful data until present, of 100 million galaxies [Amon et al 2021].

Dark Energy Survey Deep Fields: I co-coordinated this team, responsible for the processing and validation of the deep, optical+NIR fields, crucial for the Year 3 analysis. [16]

I used machine learning and data science techniques to develop new statistical methods for accurate weak lensing measurements, especially for estimating and calibrating photometric redshifts for the Dark Energy Survey [15, 14].

 I have worked on validating the Dark Energy Survey's Year 3 galaxy catalogue. Specifically, I tested the shape calibration, point spread function modelling and using image simulations to understand blending, whileand co-coordinated the shear testing team [11,12,13].

I performed a combined-probe test of General Relativity with weak lensing and spectroscopic data to measure the E_G statistic [Amon+2018]

I processed and analysed the bright-time, single i-band dataset from the KiDS survey, which already spanned >1000 sq. deg. in 2018. I tested the homogeneity of the survey, measured and validated the PSF, shears and redshift distributions and used it as a consistency test of the main KiDS data.

I was a core member of the 2dFLenS (a spectroscopic redshift survey designed as a follow-up of KiDS) taking observations and redshiting data. It uses the  2dF-AAOmega multi-fibre spectroscopic system at the Australian Astronomical Observatory [6].

I was a core member of the KiDS 450 sq. deg. analysis. KiDS is a large optical imaging survey, designed primarily for weak-lensing. Its exquisite quality data is taken from the VLT Survey Telescope at the ESO Paranal Observatory [ 1, 2, 3, 4, 5].