Mastodawn

In a new work led by @mariamannone we combined quantum-approaches with #recurrence_plot "Quantum-inspired density-matrix recurrence analysis of brain time series" https://link.springer.com/article/10.1140/epjs/s11734-026-02340-9

Quantum-inspired density-matrix recurrence analysis of brain time series - The European Physical Journal Special Topics

Recurrence analysis allows the investigation of self-similarities in time series. Different degrees of regularity of behaviours, or different typologies of chaos, help characterise physical phenomena whose properties are expressed by time series. We consider here the special case of time series of human brain activity in the insula, an area particularly relevant for emotional and cognitive processing. Starting from time series obtained using functional magnetic resonance imaging, we adopt recurrence plots to investigate differences between normal and selected pathological behaviours. We also present a technique to encode time series into quantum-inspired states, by constructing a density matrix via a kernel mapping. Recurrence structures are derived from similarities between the components of its principal eigenvector. The obtained results highlight differences in behaviour between the time series. Overall, this conceptual study bridges ideas from nonlinear physics, quantum physics, and medical physics.

SpringerLink

Norbert Marwan May 21

I'm happy that I could contribute to this very interesting novel #recurrence_plot idea: "Node-weighted recurrence analysis for path dynamics on networks"
https://link.springer.com/article/10.1140/epjs/s11734-026-02337-4

Node-weighted recurrence analysis for path dynamics on networks - The European Physical Journal Special Topics

Trajectories of units moving on networks are relevant for nonlinear dynamical systems as diverse as polymers, ocean drifters, and human mobility. Although RQA is a well-researched tool with applications in many areas, it has rarely been used for spatial trajectories on networks. Here, we explore the use of RQA for paths on networks. We find that path dynamics on networks display recurrence patterns that are not often described in other applications of recurrence analysis. In particular, the combination of diagonal lines and perpendicular diagonal lines, indicates backtracking paths. We find that recurrence analysis for path dynamics on networks can be helpful to (a) better understand the network structure if dynamic and recurrence plots are known, (b) better understand the dynamics if network and recurrence plots are known, and (c) understand the interaction between path dynamics and the underlying network.

SpringerLink

Norbert Marwan May 21

This month's CTCS webinar by Prof. Mahendra Verma (Indian Institute of Technology, Kanpur, India).
Title: On the absence of the ultimate regime in turbulent thermal convection
Date: May 25, 2026
Timing: 7:30 PM to 9:00 PM IST, 4:00 PM to 05:30 PM CET
Zoom link: https://us06web.zoom.us/webinar/register/WN_K4F5k9O4QmuZbt5uZNj9Qw

Norbert Marwan May 18

Back from a new photogrammetry campaign in a Thuringian cave, collecting almost 100 GB data (more than 2000 photos) at two different, very exciting sites in the cave!

Norbert Marwan May 18

We published a new study: Modeling the influence of interactions on different variables in a turbulent thermoacoustic system Available (a single control parameter sweeps the model through chaos, intermittency, limitcycle) – joint work with risujith.bsky.social and colleagues
https://doi.org/10.1063/5.0313251
https://pubs.aip.org/aip/cha/article/36/5/053114/3388887/Modeling-the-influence-of-interactions-on

Norbert Marwan May 6

Amazing - already more than 20 years that we left the beautiful site in Nice, where EGU conf. was hosted for 5 years.

Norbert Marwan May 6

Privacy Guru May 5

unterstützt hier die Petition von @digitalcourage zum Recht auf Leben ohne Digitalzwang:

https://civi.digitalcourage.de/recht-auf-leben-ohne-digitalzwang

Norbert Marwan May 6

Ralph Ruthe May 5

CDU einfach die Mutter aller Clownschulen

Norbert Marwan Apr 28

Kuketz-Blog 🛡Apr 28

Klöckner empfiehlt Wire, weil es »vollständig Ende-zu-Ende-verschlüsselt« ist. Signal auch. Hat trotzdem nicht geholfen – weil das Problem nie die Verschlüsselung war, sondern dass man auf Social Engineering hereingefallen ist. Wer fremde QR-Codes scannt, tut das mit Wire genauso. Aber anstatt das eigene Versagen aufzuarbeiten, wird der Messenger gewechselt und Verbote gefordert. Diese Menschen regulieren Chatkontrolle, Verschlüsselung und digitale Infrastruktur für 84 Millionen Menschen. Man kann echt nur noch heulen. 🙈

https://www.heise.de/news/Digitale-Souveraenitaet-Wire-soll-Signal-als-Standard-im-Bundestag-abloesen-11275640.html

#Signal #Wire #Bundestag #Phishing #SocialEngineering

/kuk

Statt Signal: Bundestagspräsidentin empfiehlt Wechsel zu Wire

Bundestagspräsidentin Klöckner empfiehlt Abgeordneten in einem Schreiben den Wechsel zum BSI-zertifizierten Messenger Wire, um Phishing-Gefahren einzudämmen.

heise online

Norbert Marwan Apr 28

Today marks the first anniversary of our PIKART catalogue's online presence! It started exactly one year ago, and since then, other researchers have downloaded and used 1.8 TB of PIKART data! 🍾
https://ar.pik-potsdam.de
#atmospheric_rivers
pik-potsdam.bsky.social

PIKART – A comprehensive global catalog of atmospheric rivers

The PIKART Atmospheric River Catalog is a global, high-resolution dataset of atmospheric rivers spanning 1940–2023. It is designed for reproducible research on AR dynamics from the tropics to the poles.