Tootfinder

The problem of course is that our problems are complex.
“Advanced AI suffers ‘complete accuracy collapse’ in face of complex problems, study finds” - https://www.theguardian.com/technology/2025/jun/09/apple-artificial-intelligence…

To collapse or not to collapse: Halo evolution with self-interacting dark matter mass segregation
Yashraj Patil, Moritz S. Fischer
https://arxiv.org/abs/2506.06272

To collapse or not to collapse: Halo evolution with self-interacting dark matter mass segregation
Surprisingly compact substructures in galaxies and galaxy clusters, but also field halos, have been observed by gravitational lensing. They could be difficult to explain with collisionless dark matter (DM). To explain those objects, recent studies focused on the gravothermal collapse that halos consisting of self-interacting dark matter (SIDM) can undergo. However, simple models of elastic scattering could face problems explaining those compact objects during very later stages of the collapse a…

Relativistic Collapse Model with Quantised Time Variables
Daniel J. Bedingham, Philip Pearle
https://arxiv.org/abs/2506.07959 https://

Relativistic Collapse Model with Quantised Time Variables
A relativistic collapse model for distinguishable particles is presented. Position and time, for each particle, are the fundamental operators of the theory. The Schrödinger equation is of the CSL form, with a Hermitian Hamiltonian and an anti-Hermitian, white-noise dependent, Hamiltonian. It generates state vector evolution parametrised by an "evolution parameter". It is shown how this can be interpreted as an evolving state in spacetime with collapses satisfying Born rule probabilities, and h…

a new amazing artwork recreation by Nicholas Rougeux (@…) : "Clavis Cælestis: A Synopsis of the Universe – Digital edition of Thomas Wright’s 1742 astronomical treatise" https://www.c82.net/work/?id=399

📢 Bochum und Kiel steigen aus der Bundesliga ab
Der VfL Bochum und Holstein Kiel steigen aus der Fußball-Bundesliga ab. Für beide Clubs ist schon nach dem vorletzten Spieltag der Klassenerhalt rechnerisch nicht mehr möglich.
➡️ https://www.tagesschau.de/eilm…

Bochum und Kiel steigen aus der Bundesliga ab
Der VfL Bochum und Holstein Kiel steigen aus der Fußball-Bundesliga ab. Für beide Clubs ist schon nach dem vorletzten Spieltag der Klassenerhalt rechnerisch nicht mehr möglich.

Colloid-like scale-free cluster-cluster aggregation during polymer collapse
Suman Majumder, Saikat Chakraborty
https://arxiv.org/abs/2506.06801 https://

Colloid-like scale-free cluster-cluster aggregation during polymer collapse
An extended polymer collapses to form a globule when subjected to a quench below the collapse transition temperature. The process begins with the formation of clusters of monomers or ``pearls''. The nascent clusters merge, resulting in growth of the average cluster size $C_s$, eventually leading to a single globule. The aggregation of the clusters are known to be analogous to droplet coalescence. This suggests a striking resemblance between such an aggregation and cluster-cluster aggregation in…

Challenging Spontaneous Quantum Collapse with XENONnT
E. Aprile, J. Aalbers, K. Abe, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, D. Ant\'on Martin, S. R. Armbruster, F. Arneodo, L. Baudis, M. Bazyk, L. Bellagamba, R. Biondi, A. Bismark, K. Boese, A. Brown, G. Bruno, R. Budnik, C. Cai, C. Capelli, J. M. R. Cardoso, A. P. Cimental Ch\'avez, A. P. Colijn, J. Conrad, J. J. Cuenca-Garc\'ia, C. Curceanu, V. D'Andrea, L. C. Daniel Garcia, M. P. Decowski, A. Deist…

Challenging Spontaneous Quantum Collapse with XENONnT
We report on the search for X-ray radiation as predicted from dynamical quantum collapse with low-energy electronic recoil data in the energy range of 1-140 keV from the first science run of the XENONnT dark matter detector. Spontaneous radiation is an unavoidable effect of dynamical collapse models, which were introduced as a possible solution to the long-standing measurement problem in quantum mechanics. The analysis utilizes a model that for the first time accounts for cancellation effects i…

Spectral convergence of graph Laplacians with Ricci curvature bounds and in non-collapsed Ricci limit spaces
Masato Inagaki
https://arxiv.org/abs/2506.07427

Spectral convergence of graph Laplacians with Ricci curvature bounds and in non-collapsed Ricci limit spaces
This paper establishes quantitative high-probability bounds on the eigenvalues and eigenfunctions of $ε$-neighborhood graph Laplacians constructed from i.i.d. random variables on $m$-dimensional closed Riemannian manifolds $(M,g)$ that satisfy a uniform lower Ricci curvature bound $\operatorname{Ric}_g\ge -(m-1)K$, a positive lower volume bound, and an upper diameter bound. These results extend to non-collapsed Ricci limit spaces that are measured Gromov-Hausdorff limits of such manifolds, and…

Comparative Testing of Subgrid Models for Fast Neutrino Flavor Conversions in Core-collapse Supernova Simulations
Ryuichiro Akaho, Hiroki Nagakura, Shoichi Yamada
https://arxiv.org/abs/2506.07017

Comparative Testing of Subgrid Models for Fast Neutrino Flavor Conversions in Core-collapse Supernova Simulations
We investigate key methodologies of Bhatnagar-Gross-Krook subgrid modeling for neutrino fast flavor conversions (FFC) in core-collapse supernova based on spherically symmetric Boltzmann radiation hydrodynamics simulations. We first examine time integration methods (explicit, implicit, or semi-implicit) and time step control for the subgrid term, and then compare various approaches in the literature approximating FFCs in two aspects: (1) angular dependent survival probability of neutrinos versus…

Accurately simulating core-collapse self-interacting dark matter halos
Moritz S. Fischer, Hai-Bo Yu, Klaus Dolag
https://arxiv.org/abs/2506.06269 https://

Accurately simulating core-collapse self-interacting dark matter halos
The properties of satellite halos provide a promising probe for dark matter (DM) physics. Observations motivate current efforts to explain surprisingly compact DM halos. If DM is not collisionless but has strong self-interactions, halos can undergo gravothermal collapse, leading to higher densities in the central region of the halo. However, it is challenging to model this collapse phase from first principles. To improve on this, we seek to better understand numerical challenges and convergence…