Integrated 3-point correlation functions of weak lensing cosmic shear

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• Dr Anik Halder (Institute of Astronomy)
• Monday 24 February 2025, 16:00-17:00
• Martin Ryle Seminar Room, KICC.

If you have a question about this talk, please contact km723.

Most statistical analyses currently performed on weak lensing cosmic shear data are focused on the evaluation of 2-point correlation functions (2PCFs). Several challenges (e.g. computationally expensive estimation, severe lack of theoretical models etc.) have kept the analysis of higher-order (beyond 2-point) statistics on data rather few. To overcome these challenges, we have introduced a practical and efficient to estimate higher-order cosmic shear statistic called the integrated 3-point correlation function (i3PCF). In this talk I will present the framework for measuring the i3PCF, modelling and speeding up their analytical predictions using neural network emulators, and show how compared to a 2PCF-only analysis, a combined 2PCF & i3PCF analysis can lead to significant improvements in the constraints of cosmological parameters as analysed on Dark Energy Survey Year 3 data. I will end the talk by discussing potential applications of the i3PCF within a simulation-based inference (SBI) framework.

This talk is part of the Astro Data Science Discussion Group series.

This talk is included in these lists:

• Astro Data Science Discussion Group
• Cambridge Astronomy Talks
• Combined External Astrophysics Talks DAMTP
• Cosmology, Astrophysics and General Relativity
• Institute of Astronomy Extra Talks
• Institute of Astronomy Talk Lists
• Martin Ryle Seminar Room, KICC

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