Tootfinder

Berliner Datenschutzbehörde will DeepSeek in App Stores sperren lassen
Die Berliner Beauftragte für Datenschutz greift gegen die KI-App DeepSeek durch. Da diese Daten nach China überträgt, soll sie in App Stores gesperrt werden.

Typisch €DU: Kein Geld für Kultur und Soziales wegen angespannter Haushaltslage, aber von 3 Mio. € für zusätzliche Überwachung und sinnlose Law-and-Order Symbolpolitik träumen.
https://www.saechsische.de/lokales/dresden

Wie Dresden den „Kampf gegen Graffiti gewinnen“ will
Gesprühte Kunst wird in Dresden nun mit Laserstrahlen entfernt. Damit will die Stadt Sprayer abschrecken. Aber das kostet viel Geld.

Groupoid models for relative Cuntz-Pimsner algebras of groupoid correspondences
Ralf Meyer
https://arxiv.org/abs/2506.19569 https://a…

Groupoid models for relative Cuntz-Pimsner algebras of groupoid correspondences
A groupoid correspondence on an etale, locally compact groupoid induces a C*-correspondence on its groupoid C*-algebra. We show that the Cuntz-Pimsner algebra for this C*-correspondence relative to an ideal associated to an open invariant subset of the groupoid is again a groupoid C*-algebra for a certain groupoid. We describe this groupoid explicitly and characterise it by a universal property that specifies its actions on topological spaces. Our construction unifies the construction of groupo…

Enhanced quantum sensing of gravitational acceleration constant
Giorgio Stucchi, Matteo G. A. Paris
https://arxiv.org/abs/2506.20352 https://

Enhanced quantum sensing of gravitational acceleration constant
We investigate the use of quantum probes to accurately determine the strength of the local gravitational field on Earth. Our findings show that delocalized probes generally outperform localized ones, with the precision enhancement scaling quadratically with the separation between the two wavefunction components. This advantage persists under realistic position measurements, which can achieve precision not too far from the ultimate bound. We also discuss the influence of Earth's surface, demonst…

Hair imprints of the gravitational decoupling and hairy black hole spectroscopy
V. F. Guimar\~aes, R. T. Cavalcanti, R. da Rocha
https://arxiv.org/abs/2506.20044

Hair imprints of the gravitational decoupling and hairy black hole spectroscopy
Hairy black holes by gravitational decoupling (GD) are probed to derive the gravitational waveform produced by perturbation theory applied to these compact objects. Using the Regge-Wheeler and Zerilli equations governing the metric perturbations and applying a higher-order WKB method, the quasinormal modes (QNMs) are computed and discussed. Compared to the QNMs produced in the ringdown phase of Reissner-Nordström black hole solutions, it yields a clear physical signature of primary hair imprin…

Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence using SpeX and FIRE Observations
Fatemeh Davoudi, Benjamin V. Rackham, Julien de Wit, Jan Toomlaid, Micha\"el Gillon, Amaury H. M. J. Triaud, Adam J. Burgasser, Christopher A. Theissen
https://arxiv.org/…

Gravity-sensitive Spectral Indices in Ultracool Dwarfs: Investigating Correlations with Metallicity and Planet Occurrence using SpeX and FIRE Observations
We present a near-infrared spectroscopic analysis (0.9-2.4 micron) of gravity indices for 57 ultracool dwarfs (spectral types M5.5 to L0), including exoplanet hosts TRAPPIST-1, SPECULOOS-2, SPECULOOS-3, and LHS 3154. Our dataset includes 61 spectra from the SpeX and FIRE spectrographs. Using gravity-sensitive indices such as FeH absorption (at 0.99, 1.20, and 1.55 microns), the VO band at 1.06 microns, the H-band continuum, and alkali lines like K I (at 1.17 and 1.25 microns), we investigate co…

Predicting wide binaries and deviations from standard gravity using machine learning algorithms
Amoy Ashesh, Harsimran Kaur, Sandeep Aashish
https://arxiv.org/abs/2506.19942

Predicting wide binaries and deviations from standard gravity using machine learning algorithms
We present a machine learning (ML) framework for the detection of wide binary star systems and the identification of deviations from standard gravity using Gaia DR3 data. By training supervised ML models on established wide binary catalogues, we efficiently classify wide binaries and employ clustering and nearest neighbour search to pair candidate systems. We recast the problem of identifying systematic deviations from standard gravity as a supervised anomaly detection. Our approach incorporate…

Jubiläum des größten Internetknotens der Welt: Der DE-CIX wird 30
Vor 30 Jahren entstand in Frankfurt der heute größte Internetknoten der Welt DE-CIX. Anfangs wurde mit 2-Megabit-Leitungen gearbeitet.

The mixing of internal gravity waves and lithium production in intermediate-mass AGB stars
Zhijun Wang, Guoliang L\"u, Chunhua Zhu, Sufen Guo, Helei Liu, Xizhen Lu
https://arxiv.org/abs/2506.20360

The mixing of internal gravity waves and lithium production in intermediate-mass AGB stars
Context: Intermediate-mass asymptotic giant branch (AGB) stars influence Galactic lithium evolution by ejecting surface material (including Li) via stellar winds. Internal gravity waves (IGW), excited by convective motions, drive turbulent mixing in non-convective regions, altering stellar surface and wind chemistry. Aims: Investigate IGW-induced extra-mixing in the radiative zone between thermal pulses and convective envelopes of AGB stars and its impact on Li production. Derive the total Li c…

Fairphone 6: Beim neuen fairen Smartphone geht ohne Schraubendreher nichts mehr
Das niederländische Unternehmen Fairphone hat das Fairphone 6 vorgestellt. Das fairer produzierte Smartphone mutet abermals gereifter an.