Tootfinder

"Les alouettes et d'autres espèces d'oiseaux prospèrent dans les parcs solaires allemands, où le succès de la reproduction dépasse celui de nombreux autres habitats. Ces sites de projets photovoltaïques sont en train de devenir de précieux refuges, profitant Š la fois Š la faune sauvage et Š l'environnement environnant."
#solaire

Streit um Migrationspolitik
Richter nach Entscheidung zu Asyl-Zurückweisungen bedroht!
Woher? Klar, von rechts?
#afd_verbot_jetzt
https://www.sueddeutsche.de/poli…

Richter nach Entscheidung zu Asyl-Zurückweisungen bedroht
Drei Berliner Verwaltungsrichter werden laut Richterbund diffamiert und bedroht, seit sie die von Bundesinnenminister Dobrindt angeordneten Zurückweisungen Asylsuchender als rechtswidrig eingestuft hatten.

This https://arxiv.org/abs/2505.05432 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Boundary Energy-Momentum Tensors for Asymptotically Flat Spacetimes
We consider 3D and 4D asymptotically flat spacetimes near future null infinity endowed with the most general allowed Carroll geometry. We define a boundary energy-momentum tensor by varying the on-shell action with respect to the Carroll metric data. This requires adding counterterms to the Einstein-Hilbert action. We show that, in 4D, the shear is on par with the Carroll metric data. Their combined response defines a boundary energy-momentum-news complex whose diffeomorphism Ward identity is e…

Diffeomorphic approximation of piecewise affine homeomorphisms
Daniel Campbell, Luigi D'Onofrio, Tom\'a\v{s} V\'itek
https://arxiv.org/abs/2507.02854

Diffeomorphic approximation of piecewise affine homeomorphisms
Given any $f$ a locally finitely piecewise affine homeomorphism of $Ω\subset \mathbb{R}^d$ onto $Δ\subset \mathbb{R}^d$ (for $d=3, 4$) such that $f\in W^{1,p}(Ω, \mathbb{R}^d)$ and $f^{-1}\in W^{1,q}(Δ, \mathbb{R}^d)$, $1\leq p ,q < \infty$ and any $ε>0$ we construct a diffeomorphism $\tilde{f}$ such that $$\|f-\tilde{f}\|_{W^{1,p}(Ω,\mathbb{R}^d)} + \|f^{-1}-\tilde{f}^{-1}\|_{W^{1,q}(Δ,\mathbb{R}^d)} < ε.$$

This https://arxiv.org/abs/2303.07133 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Braid stability for periodic orbits of area-preserving surface diffeomorphisms
We consider an area-preserving diffeomorphism of a compact surface, which is assumed to be an irrational rotation near each boundary component. A finite set of periodic orbits of the diffeomorphism gives rise to a braid in the mapping torus. We show that under some nondegeneracy hypotheses, the isotopy classes of braids that arise from finite sets of periodic orbits are stable under Hamiltonian perturbations that are small with respect to the Hofer metric. A corollary is that for a Hamiltonian …

J'apprends que le velcro est une invention suisse, et son le nom est la contraction de "velours" et "crochet"
https://www.rts.ch/info/societe/2025/article/le-…

der Aufsatz in der @… zur Identifikatorenpolitik an der #BnF (https://doi.org/10.5282/o-bib/6149

Selenskyj definiert Schwerpunkte der Verhandlungen
Der ukrainische Präsident Wolodymyr Selenskyj hat die Verhandlungsbereitschaft seines Landes unterstrichen. "Wir sind bereit, die nötigen Schritte für den Frieden zu unternehmen", sagte er während eines Besuchs in Litauen. Als "Ausgangspunkt" für eine Einigung nannte Selenskyj eine Waffenruhe sowie "humanitäre Maßnahmen", die Befreiung von Kriegsgef…
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Type II RR string fields and exotic diffeomorphisms
Raji Ashenafi Mamade, Barton Zwiebach
https://arxiv.org/abs/2506.00120 https://ar…

Type II RR string fields and exotic diffeomorphisms
We study the theory of massless fields of type II strings arising from the string field theory that uses two string fields, a physical one and an extra one that allows the writing of an action, but whose degrees of freedom ultimately decouple. The mechanism allowing the description of the self-dual five-form of type IIB, anticipated by Sen, is used by the SFT to describe all Ramond-Ramond forms in type IIB and IIA in a manifestly duality-invariant way. We find explicit expressions for the leadi…

Transverse diffeomorphism invariant spin-2 theories via gauge invariants
D. Dalmazi, Luiz G. M. Ramos
https://arxiv.org/abs/2506.24047 https://

Transverse diffeomorphism invariant spin-2 theories via gauge invariants
We analyze the particle spectrum of a second-order (in derivatives) theory based on a rank-2 tensor field with both symmetric and antisymmetric components. By demanding the existence of a propagating massless spin-2 particle and invariance under transverse diffeomorphisms, we derive a new class of stable models with two massless scalars and a single massless spin-2 particle. A natural nonlinear completion is proposed in terms of a dynamical metric field. The identification of the spectrum is ca…