Tootfinder

See my new Substack post for “Resist and Heal” - Lies About South African “White Genocide“
https://open.substack.com/pub/resistandheal/p/lies-about-south-african-white-genocide?r=4u…

Lies About South African “White Genocide“
The United States is in a fascist political crisis.

Existence of Coupled Optical Vortex Solitons Propagating in a Quadratic Nonlinear Medium
Luciano Medina
https://arxiv.org/abs/2506.16452 https://

Existence of Coupled Optical Vortex Solitons Propagating in a Quadratic Nonlinear Medium
We consider the coupled propagation of an optical field and its second harmonic in a quadratic nonlinear medium governed by a coupled system of Schrodinger equations. We prove the existence of ring-profiled optical vortex solitons appearing as solutions to a constrained minimization problem and as solutions to a min-max problem. In the case of the constrained minimization problem solutions are shown to be positive with undetermined wave propagation constants, but in the min-max approach the wav…

How I Approach Performance Investigations
https://ricomariani.medium.com/how-i-approach-performance-investigations-69f4191c553f?source=rss-e6e91dab0708------2

Star Formation and Magnetic Field Amplification due to Galactic Spirals
Hector Robinson, James Wadsley, J. A. Sellwood, Ralph E. Pudritz
https://arxiv.org/abs/2506.16515

Star Formation and Magnetic Field Amplification due to Galactic Spirals
We use global MHD galaxy simulations to investigate the effects of spiral arms on the evolution of magnetic fields and star formation within a self-regulated interstellar medium (ISM). The same galaxy is simulated twice: once with self-consistent stellar spiral arms and once more with the stellar spirals suppressed via a novel numerical approach, using the Ramses AMR code. Spiral arms continually promote star formation, with 2.6 times higher rates in the spiral galaxy. The higher rate is due to…

Series A, Episode 06 - Seek-Locate-Destroy
RAI: Yes, Supreme Commander.
SERVALAN: Let them know, too, that any lack of cooperation, any hesitation in responding to an order, will be treated as mutiny. Let them know I have said this. Dismissed. [Rai clicks his heels and exits. There is a bleep from the comm. Servalan ignores it, looking pensive. The comm bleeps again and Servalan reacts this time.]

Blakes7Bot | Search
Companion site to the Blakes7Bot Twitter, Mastodon, and Bluesky accounts. Automated lines of Blakes 7 dialog. Includes a script search facility.

Phase-space excluded-volume approach for light clusters in nuclear medium
Rui Wang, Zhen Zhang, Stefano Burrello, Maria Colonna, Edoardo G. Lanza
https://arxiv.org/abs/2506.16437 …

Phase-space excluded-volume approach for light clusters in nuclear medium
A phase-space excluded-volume approach is developed to investigate the in-medium properties of light clusters in nuclear matter. In this approach, light clusters can exist only if the total nucleon phase-space occupation of the surrounding nuclear medium -- including explicit contributions from light clusters -- is sufficiently low. The distribution functions of nucleons and light clusters are determined self-consistently by accounting for the interplay between in-medium effects and thermodynam…

Comparison of substructured non-overlapping domain decomposition and overlapping additive Schwarz methods for large-scale Helmholtz problems with multiple sources
Boris Martin, Pierre Jolivet, Christophe Geuzaine
https://arxiv.org/abs/2506.16875

Comparison of substructured non-overlapping domain decomposition and overlapping additive Schwarz methods for large-scale Helmholtz problems with multiple sources
Solving large-scale Helmholtz problems discretized with high-order finite elements is notoriously difficult, especially in 3D where direct factorization of the system matrix is very expensive and memory demanding, and robust convergence of iterative methods is difficult to obtain. Domain decomposition methods (DDM) constitute one of the most promising strategy so far, by combining direct and iterative approaches: using direct solvers on overlapping or non-overlapping subdomains, as a preconditi…

📢 US-Präsident Trump verlässt G7-Gipfel vorzeitig
US-Präsident Donald Trump verlässt den G7-Gipfel in Kanada nach Angaben des Weißen Hauses vorzeitig. "Präsident Trump wird heute Abend nach Washington zurückkehren, um sich um viele wichtige Angelegenheiten zu kümmern", teilte Trumps Sprecherin Karoline Leavitt mit. Die US-Regierungszentrale nannte die Lage im Nahen Osten als Grund für die vorgezogene Abreise.
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US-Präsident Trump verlässt G7-Gipfel vorzeitig
US-Präsident Donald Trump verlässt den G7-Gipfel in Kanada nach Angaben des Weißen Hauses vorzeitig. "Präsident Trump wird heute Abend nach Washington zurückkehren, um sich um viele wichtige Angelegenheiten zu kümmern", teilte Trumps Sprecherin Karoline Leavitt mit. Die US-Regierungszentrale nannte die Lage im Nahen Osten als Grund für die vorgezogene Abreise.

Error analysis of BDF schemes for the evolutionary incompressible Navier--Stokes equations
Bosco Garc\'ia-Archilla, V. John, Julia Novo
https://arxiv.org/abs/2506.16917

Error analysis of BDF schemes for the evolutionary incompressible Navier--Stokes equations
Error bounds for fully discrete schemes for the evolutionary incompressible Navier--Stokes equations are derived in this paper. For the time integration we apply BDF-$q$ methods, $q\le 5$, for which error bounds for $q\ge 3$ cannot be found in the literature. Inf-sup stable mixed finite elements are used as spatial approximation. First, we analyze the standard Galerkin method and second a grad-div stabilized method. The grad-div stabilization allows to prove error bounds with constants independ…

General-domain FC-based shock-dynamics solver I: Basic elements
Oscar P. Bruno, Daniel V. Leibovici
https://arxiv.org/abs/2506.16076 https://

General-domain FC-based shock-dynamics solver I: Basic elements
This contribution, Part I in a two-part article series, presents a general-domain version of the FC-SDNN (Fourier Continuation Shock-detecting Neural Network) spectral scheme for the numerical solution of nonlinear conservation laws, which is applicable under arbitrary boundary conditions and in general domains. Like the previous simple-domain contribution (Journal of Computational Physics X 15, (2022)), the present approach relies on the use of the Fourier Continuation method for accurate spec…