Speaker
Minahil Adil Butt
(SISSA)
Description
We perform a stacking analysis of galaxy cluster velocity phase space using the caustic technique. By stacking 128 clusters, we create four robust stacked clusters with excellent agreement between caustic masses and binned medians. We model the gravitational potential using the NFW profile, validating the $\Lambda$CDM mass-concentration relation. Implementing the Chameleon screening model, we find constraints on modified gravity parameters consistent with $\Lambda$CDM, yielding stringent upper limits of $|f_{\rm R0}| \lesssim 4 \times 10^{-6}$ at 95% C.L. for $f(\mathcal{R})$ gravity. We also test the caustic technique's effectiveness in constraining MOND in individual clusters.
Primary author
Minahil Adil Butt
(SISSA)
Co-authors
Prof.
Andrea Lapi
(SISSA)
Prof.
Antonaldo Diaferio
(UNITO)
Dr
Balakrishna S. Haridasu
(SISSA)
Prof.
Carlo Baccigalupi
(SISSA)
Mr
Francesco Benetti
(SISSA)
