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Speaker: Marco Bonici (Waterloo) – Title: Taming projection effects in galaxy clustering analysis
July 1 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: July 1, 2025
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Marco Bonici (Waterloo)
Title: Taming projection effects in galaxy clustering analysis
Abstract: The analysis of galaxy clustering measurements from surveys like Euclid or DESI is likely to be affected by the so called projection effects, which causes the 1D marginals of the analysis to not contain the bestfit; this is a serious issue which can potentially harm the cosmological interpretation of these analyses. I will outline three complementary strategies to mitigate this bias: (i) simulation-calibrated priors, (ii) a frequentist framework based on profile likelihoods, and (iii) a Bayesian re-parameterisation that isolates degenerate directions. Applied to full shape data, each method reduces the impact of projection effects. I will present the reduction of the projection effects for each technique when applied to DESI data.
Join Zoom Meeting
https://lbnl.zoom.us/j/95679892182?pwd=RU5xU2dDRFNabnR1U3pQMklkYWFIdz09
Meeting ID: 956 7989 2182
Passcode: 169037