## SFB Members at the RICAM Special Semester – Workshop 5

The Special Semester on “Tomography Across the Scales” concluded with its final workshop on “Inverse Problems in Large Scales” and spanned the interval between 28 November – 2 December 2022.

There, SFB member Fabian Hinterer gave a talk on “a projected Nesterov-Kaczmarz approach to stellar population distribution reconstruction in Extragalactic Archaeology” in the presence of experts spanning the various mathematical branches that are connected to inverse problems. Other SFB members were also participants, including organisers Otmar Scherzer and Ronny Ramlau, as well as Peter Elbau, Michael Quellmalz, Ekaterina Sherina, Simon Hubmer and Kemal Raik.

We would once again like to thank the organisers for their hospitality and providing the platform for experts in the area to share and exchange ideas.

## SFB Members at the RICAM – Special Semester

From 10th to 21st of October, the first two workshop-weeks of the RICAM Special Semester “Tomography across the Scales” took place at the Johann Radon Institute for Computational and Applied Mathematics in Linz. There, Fabian Hinterer, Simon Hubmer, Michael Quellmalz, Ekaterina Sherina and Leopold Veselka, all members of the mathematical subprojects within the SFB project, were invited to present their latest scientific advances to an audience of experts in the various fields of Inverse Problems.
Furthermore, the members got the chance to exchange ideas with other researchers and to benefit from external input.
We express our gratitude to the organizers for the invitation and the hospitality during these perfectly organized workshops!

## SFB at the RICAM – Special Semester

Currently, the autumn school as part of the Special Semester “Tomography Across the Scales” takes places at the RICAM in Linz. Peter Elbau, one of our project leaders, was invited to give an introductory lecture on the mathematics behind optical coherence tomography. The audience, including several members of SFB, warmly welcomed the intuitive and very well presented lecture on this highly complex topic.

## SFB Member Meeting in Gmunden

From 26th to 29th of September 2022, the SFB members and project associates met in person for the Fifth SFB Member Meeting, which took place at the “Hois’n Wirt” Hotel in Gmunden. This was the first member meeting held in the second funding period of the SFB project and also the first one after covid-19 restrictions. All participants had a chance to present and discuss their work and broader research interests related to their sub-projects in a casual atmosphere. The members enjoyed the enlightening variety of topics reflected in the event program, fruitful interdisciplinary collaboration discussions and a hike up Grünberg and Laudachsee.

A big thanks to all members for their active participation and also to the member speaker Ekaterina Sherina for organizing this event!

## Mini-symposium in IPMS 2O21

The Tenth International Conference “Inverse Problems: Modeling and Simulation” (IPMS2021) has now been postponed to May 22 –28, 2022. The conference takes place in Malta.

We are happy to announce that we are organizing a mini-symposium entitled “Mathematical Methods in Tomography Across the Scales” related to our SFB. The speakers are members and associated members of the SFB.

## Sixth Internal Meeting: Research and future plans!

The 6th Internal Meeting took place virtually on November 30th and December 1st. Unfortunately, we could not meet in person due to the current circumstances but this online meeting gave us the opportunity to be all together in an online room.

In this meeting, very interesting talks were presented from our members and associate members of the SFB. The principal investigators presented the current status of research and future plans. Gabriele Steidl (TU Berlin, Germany) and Glenn van de Ven (University of Vienna) presented their research interests and ideas for future collaborations within the SFB.

Hopefully we can meet in person again in Obergurgl in March!

## SFB goes to Banff, Canada

Otmar Scherzer was a member of the organizing committee of the “Reconstruction Methods for Inverse Problems” workshop in Banff, Canada, June 23-28, 2019. This workshop brought together researchers working on inverse problems coming from medical imaging, non destructive testing, computer vision and geophysics. The PI of sub-project “Quantitative Coupled Physics Imaging”, Peter Elbau and the post-doctoral researcher of the sub-project “Tomography with Uncertainties”, Ekaterina Sherina presented their recent work related to our SFB project.

## Reconstruction Methods for Inverse Problems (19w5092)

at Banff, Alberta from Sunday, June 23 to Friday June 28, 2019

## Organizers

• Elena Beretta (NYU Abu Dhabi & Politecnico di Milano)
• Uri Ascher (University of British Columbia)
• Otmar Scherzer (University of Vienna)
• Luminita Vese (University of California, Los Angeles)

## Description

Inverse problems require to determine the cause from a set of indirect observations. Such problems appear in medical imaging, non destructive testing of materials, computerized tomography, source reconstructions in acoustics, computer vision and geophysics, to mention but a few. The 21st century is the golden age of computer imaging: Measurement devices have become enormously powerful and huge amounts of data are recorded at every eye glimpse. Moreover, computer technology has developed to such a high degree of efficiency that the evaluation of such an enormous amount of data has become possible *if* adequate mathematical and computational tools are used.

Recently, the community has been exposed to fundamentally new mathematical models (such as learning), which stimulated exciting theoretical developments and new computational algorithms for solving complicated large scale inverse problems. This workshop will survey modern and identify new mathematical and computational developments for tackling such problems.

more details

## The first SFB meeting was a success!

In the Obergurgl University Center, the initial SFB “Tomography across the scales” meeting took place, on March, 18-20.  It was attended by the Principal investigators, members, external associated researchers and candidates. The participants had the opportunity, for the first time, to meet all members and interact with people from different disciplines. The talks were interesting covering all “scales”, from mathematics and physics to medical- and bio-sciences.

Everyone is looking forward to the next meeting at the end of the year!

## Workshop “Inverse Problems in the Alps II”

Then, on March, 21-23, followed the more mathematical oriented workshop “Inverse Problems in the Alps II” co-organized by the SFB, the RICAM and the Doctoral Program “Computational Mathematics”. More than 30 participants enjoyed the talks in this wonderful location. This workshop celebrated also the 60th birthday ($$\varepsilon$$ far) of Elena Beretta,  Politecnico di Milano, Italy!