Skip to main content

Seminar 13 December @ 16:00 (UTC)

 

Getting something out of nothing:  topological data analysis for cosmology.

Date: Tuesday, 13 December 2022

Time: 16:00 (UTC)

Speaker:  Dr Jessi Cisewski Kehe (University of Wisconsin, USA)

Contact the organizer: Andriy Olenko a.olenko@latrobe.edu.au

Abstract:

The transference from data to information is a key component of many areas of research in astronomy and cosmology. This process can be challenging when data exhibit complicated spatial structures, such as the large-scale structure (LSS) of the Universe. Methods that target shape-related features may be helpful for summarizing qualitative properties that are not retrieved with standard techniques. Topological data analysis (TDA) provides a framework for quantifying shape-related properties of data. Persistent homology is a popular TDA tool that offers a procedure to represent, visualize, and interpret complex data by extracting topological features which may be used to infer properties of the underlying structures. Persistent homology is used to find different dimensional holes in a dataset across different scales, where zero-dimensional holes are clusters, one-dimensional holes are closed loops, two-dimensional holes are voids, and so on. The information is summarized in a persistence diagram, which may be used for further analysis such as visualization, inference, or classification. I will give an overview of persistent homology and discuss its use in some cosmology applications, such as discriminating LSS under varying cosmological assumptions.

See zoom meeting details below.
This seminar is a part of an international online seminars series on Statistics and Data Science applications in Astronomy:
This seminar is an initiative of the International Astrostatistics Association and the IAU Astroinformatics and Astrostatistics Commission. The seminar alternate between Europe-US and Australasia-Europe on a monthly basis.
 
The seminar boardStefano Andreon - INAF-OA Brera, Italy    (chair)Fabio Castagna - INAF-OA Brera, University of Insubria, ItalyAndriy Olenko - La Trobe University, AustraliaTsutomu T. Takeuchi - Nagoya University, Japan
=============
Join Zoom Meeting 
https://us02web.zoom.us/j/88697269614?pwd=d3RGZWJlWVhJQmFUTG9HQzc2elNwZz09Meeting ID: 886 9726 9614Passcode: 192711One tap mobile+13017158592,,88697269614#,,,,*192711# US (Washington DC)+13052241968,,88697269614#,,,,*192711# USDial by your location        +1 301 715 8592 US (Washington DC)        +1 305 224 1968 US        +1 309 205 3325 US        +1 312 626 6799 US (Chicago)        +1 346 248 7799 US (Houston)        +1 360 209 5623 US        +1 386 347 5053 US        +1 507 473 4847 US        +1 564 217 2000 US        +1 646 558 8656 US (New York)        +1 646 931 3860 US        +1 669 444 9171 US        +1 669 900 9128 US (San Jose)        +1 689 278 1000 US        +1 719 359 4580 US        +1 253 205 0468 US        +1 253 215 8782 US (Tacoma)Meeting ID: 886 9726 9614Passcode: 192711Find your local number: https://us02web.zoom.us/u/kdlvMSWRmi