# Extracting Cluster Information from small-scale CMB

- Institution: CERN
- Department: Eucapt Conferences
- Speaker: Sayan Saha
- Year: 2023
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3005079)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

The weak gravitation lensing of the Cosmic Microwave Background (CMB) \[1\] rows a wealth of information about the late-time universe in the CMB data we observe through ground-based and space-based telescopes. In this talk, I propose a method to probe Galaxy-cluster mass profiles from the lensing signature of CMB in arcmin scales. In the first part, I describe how a theoretical halo model \[2\] for a cluster gives rise to lensing signatures in the observed CMB. In the second part, I discuss how we are developing a method based on Maximum a posterior (MAP) estimator \[3\] of lensing potential to recover the cluster mass. Such an estimator will be influential in light of low noise level experiments like CMB S4.

References \[1\] A. Lewis and A. Challinor, Weak gravitational lensing of the CMB, Phys. Rept. 429 (2006) 1 \[astro-ph/0601594\]. \[2\] J.F. Navarro, C.S. Frenk and S.D.M. White, The Structure of cold dark matter halos, Astrophys. J. 462 (1996) 563 \[astro-ph/9508025\]. \[3\] J. Carron and A. Lewis, Maximum a posteriori CMB lensing reconstruction, Phys. Rev. D 96 (2017) 063510 \[1704.08230\]..

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## Lectures

1. [Extracting Cluster Information from small-scale CMB](https://invisiblenetwork.ai/learn/cern/3005079/79912cc1fa53), 6 min (CERN's player)