Tootfinder

Negative Shanshui: Real-time Interactive Ink Painting Synthesis
Aven-Le Zhou
https://arxiv.org/abs/2508.16612 https://arxiv.org/pdf/2508.16612

Negative Shanshui: Real-time Interactive Ink Painting Synthesis
This paper presents Negative Shanshui, a real-time interactive AI synthesis approach that reinterprets classical Chinese landscape ink painting, i.e., shanshui, to engage with ecological crises in the Anthropocene. Negative Shanshui optimizes a fine-tuned Stable Diffusion model for real-time inferences and integrates it with gaze-driven inpainting, frame interpolation; it enables dynamic morphing animations in response to the viewer's gaze and presents as an interactive virtual reality (VR) exp…

Towards a Real LZC Low/Zero-Carbon UK Home (2007) - Can we really go zero-carbon or negative-carbon in an existing home near London? #lowCarbon #home #microgen -

Towards a Real LZC Low/Zero-Carbon UK Home (2007)
Can we really go zero-carbon or negative-carbon in an existing home near London? #lowCarbon #home #microgen

Negatively curved K\"ahler metrics on total spaces of a class of vector bundles
Hanyu Wu, Bo Yang
https://arxiv.org/abs/2508.16354 https://arxiv.org/p…

Negatively curved Kähler metrics on total spaces of a class of vector bundles
In this paper we show an abundance of complete Kähler metrics with negative holomorphic bisectional curvature on total spaces of certain vector bundles. Assume that such total spaces are endowed with a wider class of nonpositively curved Kähler metrics. We prove dimension estimates on holomorphic functions on these manifolds, as well as Liouville theorems for holomorphic mappings between them.

🗞️ Reading news on social media for two weeks improves knowledge and fake news recognition, study finds
#news

Reading news on social media for two weeks improves knowledge and fake news recognition, study finds
Consuming news on social media is often associated with "doom scrolling," where people spend excessive time online consuming negative news. However, researchers have found that this same behavior, when leveraged effectively, can help foster a well-informed society.

#TIL that #NoisePollution is another negative thing coming out of the cryptocurrency industry thanks to this new video from #MorePerfectUnion.

Dual Thurston norm of Euler classes of foliations on negative curvature 3-Manifolds
Dmitry V. Bolotov
https://arxiv.org/abs/2506.19098 https://

Dual Thurston norm of Euler classes of foliations on negative curvature 3-Manifolds
In this paper we give an upper bound estimate on the dual Thurston norm of the Euler class of an arbitrary smooth foliation $\mathcal{F}$ of dimension one defined on a closed three-dimensional orientable manifold $M^3$ of negative curvature, which depends on the constants bounded the injectivity radius $inj(M^3)$, the volume $Vol(M^3)$, sectional curvature of the manifold $M^3$ and the mean curvature modulus of the leaves of the foliation $\mathcal{F}$.

Negative potential-induced scalarization in the Einstein-Euler-Heisenberg black hole
Hong Guo, Miok Park, Yun Soo Myung
https://arxiv.org/abs/2508.16083 https://

Negative potential-induced scalarization in the Einstein-Euler-Heisenberg black hole
We investigate a negative potential-induced scalarization of the Einstein-Euler-Heisenberg (EEH) black hole in the EEH-scalar (EEHS) theory, characterized by mass $M$, Euler-Heisenberg parameter $μ$, and magnetic charge $q$. Within this framework, the charge $q$ can exceed the extremal bound $q/M > 1$, and a single event horizon is maintained provided the parameter $μ$ exceeds the $μ_{\text{max}} = 0.019$, with the ADM mass fixed at $M = 1/2$. We obtain a single branch of scalarized EEH (sEE…

Series A, Episode 04 - Time Squad
JENNA: [To Avon] Negative anti-gravs. [Avon presses buttons] Compensate for orbital drift and hold. [points to button] Hold.
BLAKE: All confirmed.
JENNA: Good.
https://blake.torpidity.net/m/104/8 B7B4

Modular Forms with Only Nonnegative Coefficients
Paul Jenkins, Jeremy Rouse
https://arxiv.org/abs/2507.17949 https://arxiv.org/pdf/2507.17949

Modular Forms with Only Nonnegative Coefficients
We study modular forms for $\textrm{SL}_2(\mathbb{Z})$ with no negative Fourier coefficients. Let $A(k)$ be the positive integer where if the first $A(k)$ Fourier coefficients of a modular form of weight $k$ for $\textrm{SL}_2(\mathbb{Z})$ are nonnegative, then all of its Fourier coefficients are nonnegative, so that $A(k)$ can be interpreted as a ``nonnegativity Sturm bound''. We give upper and lower bounds for $A(k)$, as well as an upper bound on the $n$th Fourier coefficient of any form with…

Norm of the no-boundary state
Jordan Cotler, Kristan Jensen
https://arxiv.org/abs/2506.20547 https://arxiv.org/pdf/2506.20547

Norm of the no-boundary state
We consider Einstein gravity with positive cosmological constant coupled to matter in an asymptotically de Sitter universe with sphere boundary at timelike infinity. In this setting we show that, to one-loop order and at late time, the norm of the no-boundary state vanishes, going as $ e^{S_0} \frac{Z S_0^{-d(d+1)/4}}{\text{vol}(SO(d,1))}$ with $S_0$ the tree-level entropy of the static patch, $d$ the spacetime dimension, and $Z$ non-negative. While we expect a non-zero norm to arise at two loo…

The structure of non-Fricke Monstrous Lie algebras
Daniel Tan
https://arxiv.org/abs/2507.17854 https://arxiv.org/pdf/2507.17854

The structure of non-Fricke Monstrous Lie algebras
We consider Borcherds algebras with no real roots and the property that all zeroes in the Borcherds Cartan matrix occur in a single diagonal zero block. It follows that all other entries of the matrix are negative. We give a structure theorem for these Borcherds algebras, decomposing them into free, Heisenberg and abelian subalgebras. We show that a class of such Borcherds algebras are the Monstrous Lie algebras associated to non-Fricke elements of the Monster finite simple group. This new pers…

Chapter 7 Multi-Criteria Decision-Making: Reference-Type Methods
Zhiyuan Wang, Gade Pandu Rangaiah
https://arxiv.org/abs/2508.16087 https://arxiv.org/pdf/2…

Chapter 7 Multi-Criteria Decision-Making: Reference-Type Methods
This chapter describes selected reference-type multi-criteria decision-making (MCDM) methods that rank alternatives by comparing them with one or more reference solutions derived from an alternatives-criteria matrix (ACM). After explaining the idea of constructing positive ideal, negative ideal and/or average reference solutions, the chapter details the algorithmic steps of each method, illustrating them with a common ACM example. The 9 methods covered are: Technique for Order of Preference by …

A High-Order Compact Hermite Difference Method for Double-Diffusive Convection
Jianqing Yang, Jianxian Qiu
https://arxiv.org/abs/2506.19367 https://…

A High-Order Compact Hermite Difference Method for Double-Diffusive Convection
In this paper, a class of high-order compact finite difference Hermite scheme is presented for the simulation of double-diffusive convection. To maintain linear stability, the convective fluxes are split into positive and negative parts, then the compact Hermite difference methods are used to discretize the positive and negative fluxes, respectively. The diffusion fluxes of the governing equations are directly approximated by a high-order finite difference scheme based on the Hermite interpolat…

Passive Model Learning of Visibly Deterministic Context-free Grammars
Edi Mu\v{s}kardin, Tamim Burgstaller
https://arxiv.org/abs/2508.16305 https://arxiv.o…

Passive Model Learning of Visibly Deterministic Context-free Grammars
We present PAPNI, a passive automata learning algorithm capable of learning deterministic context-free grammars, which are modeled with visibly deterministic pushdown automata. PAPNI is a generalization of RPNI, a passive automata learning algorithm capable of learning regular languages from positive and negative samples. PAPNI uses RPNI as its underlying learning algorithm while assuming a priori knowledge of the visibly deterministic input alphabet, that is, the alphabet decomposition into sy…

Pre-Lagrangian tori transverse to an Anosov flow
Francesco Ruscelli
https://arxiv.org/abs/2508.17396 https://arxiv.org/pdf/2508.17396

Pre-Lagrangian tori transverse to an Anosov flow
An Anosov flow on a smooth three-manifold \( M \) gives rise to a Liouville structure on \( \mathbb{R} \times M \) by a construction of Mitsumatsu. In a recent paper, Cieliebak, Lazarev, Massoni and Moreno ask whether an embedded torus \( Σ\subseteq M \) transverse to an Anosov flow gives rise to a Lagrangian in \( \mathbb{R} \times M \). We show that the answer to this question is in general negative by finding a topological obstruction related to the foliations induced on the torus by the we…

Strategyproof Randomized Social Choice for Restricted Sets of Utility Functions
Patrick Lederer
https://arxiv.org/abs/2508.16195 https://arxiv.org/pdf/2508…

Strategyproof Randomized Social Choice for Restricted Sets of Utility Functions
Social decision schemes (SDSs) map the voters' preferences over multiple alternatives to a probability distribution over these alternatives. In a seminal result, Gibbard (1977) has characterized the set of SDSs that are strategyproof with respect to all utility functions and his result implies that all such SDSs are either unfair to the voters or alternatives, or they require a significant amount of randomization. To circumvent this negative result, we propose the notion of $U$-strategyproofnes…

100 calf raises at 69, also with some shoulder mobility work. #calisthenics #fitness

Ab initio study of anomalous temperature dependence of resistivity in V-Al alloys
Gabor Csire, Oleg E. Peil
https://arxiv.org/abs/2508.17977 https://arxiv.…

Ab initio study of anomalous temperature dependence of resistivity in V-Al alloys
V$_{1-x}$Al$_x$ is a representative example of highly resistive metallic alloys exhibiting a crossover to a negative temperature coefficient of resistivity (TCR), known as the Mooij correlation. Despite numerous proposals to explain this anomalous behavior,none have provided a satisfactory quantitative explanation thus far. In this work, we calculate the electrical conductivity using an ab initio methodology that combines the Kubo-Greenwood formalism with the coherent potential approximation (C…

Amazon degradation increases by 163% in two years, while deforestation falls by 54% in the same period https://phys.org/news/2025-07-amazon-degradation-years-deforestation-falls.html

Amazon degradation increases by 163% in two years, while deforestation falls by 54% in the same period
The accelerated degradation of the Brazilian Amazon, primarily due to fires, has overshadowed the significant reduction in deforestation from 2022 to 2024. This "negative balance" in protecting the biome jeopardizes the international goals for combating the climate crisis that have been assumed by the country, which is hosting the United Nations Climate Change Conference (COP30) this year.

Exploring null-entropy events: What do we learn when nothing happens?
Abhaya S. Hegde, Andr\'e M. Timpanaro, Gabriel T. Landi
https://arxiv.org/abs/2508.16528 https://

Exploring null-entropy events: What do we learn when nothing happens?
Fluctuation theorems establish that thermodynamic processes at the microscale can occasionally result in negative entropy production. At the microscale, another distinct possibility becomes more likely: processes where no entropy is produced overall. In this work, we explore the constraints imposed by such null-entropy events on the fluctuations of thermodynamic currents. By incorporating the probability of null-entropy events, we obtain tighter bounds on finite-time thermodynamic uncertainty r…

Rethinking Indonesia's Public Debt in the Era of Negative Interest Rate-Growth Differentials
Mervin Goklas Hamonangan
https://arxiv.org/abs/2507.18092 https://

Rethinking Indonesia's Public Debt in the Era of Negative Interest Rate-Growth Differentials
This study contributes to the discussion about how higher public debt may not be costly because of the negative interest rate-growth differentials by simulating OLG models introduced by Blanchard (2019) under uncertainty, showing debt and welfare dynamics in two scenarios: intergenerational transfers and debt rollovers in the case of Indonesia. The simulation is done by modifying the model parameters based on interest rate-growth differentials historic data from 2004-2019. It is found that the …

Let's say you find a really cool forum online that has lots of good advice on it. It's even got a very active community that's happy to answer questions very quickly, and the community seems to have a wealth of knowledge about all sorts of subjects.
You end up visiting this community often, and trusting the advice you get to answer all sorts of everyday questions you might have, which before you might have found answers to using a web search (of course web search is now full of SEI spam and other crap so it's become nearly useless).
Then one day, you ask an innocuous question about medicine, and from this community you get the full homeopathy treatment as your answer. Like, somewhat believable on the face of it, includes lots of citations to reasonable-seeming articles, except that if you know even a tiny bit about chemistry and biology (which thankfully you do), you know that the homoeopathy answers are completely bogus and horribly dangerous (since they offer non-treatments for real diseases). Your opinion of this entire forum suddenly changes. "Oh my God, if they've been homeopathy believers all this time, what other myths have they fed me as facts?"
You stop using the forum for anything, and go back to slogging through SEI crap to answer your everyday questions, because one you realize that this forum is a community that's fundamentally untrustworthy, you realize that the value of getting advice from it on any subject is negative: you knew enough to spot the dangerous homeopathy answer, but you know there might be other such myths that you don't know enough to avoid, and any community willing to go all-in on one myth has shown itself to be capable of going all in on any number of other myths.
...
This has been a parable about large language models.
#AI #LLM

Extremizers of a Fourier uncertainty principle related to averaging
Miquel Saucedo, Sergey Tikhonov
https://arxiv.org/abs/2508.17938 https://arxiv.org/pdf/…

Extremizers of a Fourier uncertainty principle related to averaging
We study the uncertainty principle $$\lVert\widehatμ(ξ) |ξ|^β\rVert_\infty^α \left(\int |x|^αd μ\right)^β \geq C(α,β,d){\lVertμ\rVert_{TV}^{α+β}}$$ for finite non-negative measures on $\mathbb{R}^d $. We prove that $C(α,β,d)>0$ for all $α,β>0$ and that extremizers exist. Moreover, we obtain an abstract characterization of the extremizers, which allows us to describe their asymptotic behavior and, for certain parameter values, to determine them explicitly.

On geometry of $Q^{(2k)}_g$-curvature
Mingxiang Li, Juncheng Wei, Xingwang Xu
https://arxiv.org/abs/2506.20165 https://arxiv.org/pdf/…

On geometry of $Q^{(2k)}_g$-curvature
The main purpose of current article is to study the geometry of $Q$-curvature. For simplicity, we start with a very simple model: a complete and conformal metric $g=e^{2u}|dx|^2$ on $\mathbb{R}^n$. We assume the metric $g$ has non-negative $nth$-order $Q$-curvature and non-negative scalar curvature. We show that the Ricci curvature is non-negative. We further assume that the metric $g$ is not degenerate in the sense that the isoperimetric ratio near the end is positive. With this extr…

Quantifying the ROI of Cyber Threat Intelligence: A Data-Driven Approach
Matteo Strada
https://arxiv.org/abs/2507.17628 https://arxiv.org/pdf/2507.17628

Quantifying the ROI of Cyber Threat Intelligence: A Data-Driven Approach
The valuation of Cyber Threat Intelligence (CTI) remains a persistent challenge due to the problem of negative evidence: successful threat prevention results in non-events that generate minimal observable financial impact, making CTI expenditures difficult to justify within traditional cost-benefit frameworks. This study introduces a data-driven methodology for quantifying the return on investment (ROI) of CTI, thereby reframing it as a measurable contributor to risk mitigation. The proposed fr…

Park Discovery II 🏞️
公园探险 II 🏞️
📷 Nikon FE
🎞️Lucky SHD 400
buy me ☕️ ?/请我喝杯☕️？
#filmphotography

Yiding Cao Geld mit PayPal.Me senden
Folgen Sie dem Link PayPal.Me/dingsterdingster und geben Sie den Betrag ein. Es ist bequem und sicher. Sie haben noch kein PayPal-Konto? Kein Problem.

Analysis of the Distribution and Asymptotic Approximations of Roots of the Polynomial Equation $$ z^{n 1}=(1 z)^n, n \in \mathbb{N} $$ in the Complex Plane
Hailu Bikila Yadeta
https://arxiv.org/abs/2508.15818

Analysis of the Distribution and Asymptotic Approximations of Roots of the Polynomial Equation $$ z^{n+1}=(1+z)^n, n \in \mathbb{N} $$ in the Complex Plane
We study the spatial distribution of the positive, negative and non-real complex roots $z_n $ of the sequence the $(n+1)$th degree polynomial equation $$ z^{n+1}=(1+z)^n,\quad n \in \mathbb{N}.$$ We establish asymptotic approximations to the sequence of the negative, the positive and the non-real complex roots of the equation as $n\rightarrow \infty $. In addition, we discuses the possible areas of applications of the current problem.

Thermodynamic free energy map for the non-oxidative glycolysis pathways
Adittya Pal
https://arxiv.org/abs/2506.19841 https://arxiv.or…

Thermodynamic free energy map for the non-oxidative glycolysis pathways
Designing reaction pathways that maximize the production of a target compound in a given metabolic network is a fundamental problem in systems biology. In this study, we systematically explore the non-oxidative glycolysis metabolic network, guided by the principle that reactions with negative Gibbs free energy differences are thermodynamically favored. We enumerate alternative pathways that implement the net non-oxidative glycolysis reaction, categorized by their length. Our analysis reveals se…

Self-Supervised Inductive Logic Programming
Stassa Patsantzis
https://arxiv.org/abs/2507.16405 https://arxiv.org/pdf/2507.16405

Self-Supervised Inductive Logic Programming
Inductive Logic Programming (ILP) approaches like Meta \-/ Interpretive Learning (MIL) can learn, from few examples, recursive logic programs with invented predicates that generalise well to unseen instances. This ability relies on a background theory and negative examples, both carefully selected with expert knowledge of a learning problem and its solutions. But what if such a problem-specific background theory or negative examples are not available? We formalise this question as a new setting…

Effective Pressure of the FRW Universe
Shi-Bei Kong
https://arxiv.org/abs/2507.17789 https://arxiv.org/pdf/2507.17789…

Effective Pressure of the FRW Universe
In this paper, we study the effective pressure of the $N$-dimensional FRW(Friedmann-Robertson-Walker) universe in Einstein gravity, Gauss-Bonnet gravity, and Lovelock gravity. The effective pressure is defined by $P_{eff}:=-dE/dV$, where $E=ρV$ is the effective energy and $V$ is the volume of the FRW universe inside the apparent horizon. The effective pressure in Einstein gravity is always negative and its absolute value decreases with the horizon radius $R_A$. The effective pressure in Gauss-…

Higher co-dimension de Sitter branes
Florian Niedermann, Antonio Padilla
https://arxiv.org/abs/2506.19515 https://arxiv.org/pdf/2506.…

Higher co-dimension de Sitter branes
We extend the arguments of Maldacena and Núñez to include higher co-dimension brane setups and derive a new no-go theorem. Specifically, we show that under reasonable assumptions on the energy-momentum conservation and the bulk curvature, co-dimension-two branes fail to support stable de Sitter solutions. For co-dimensions higher than two embedded in a compact internal space, we show that negative tension sources would be required. This result places strong constraints on the viability of hig…

Schön, dass die TAZ einen solchen Artikel veröffentlicht.
https://taz.de/Menschen-mit-Behinderung/!6092789/
Nachdem die TAZ aber in der Vergangenheit Behinderungen in Beiträgen als negative Metapher verwendete, die Begriffe auch nach Protest stehen ließ und auf Anschrift …

SLAP: Siamese Language-Audio Pretraining Without Negative Samples for Music Understanding
Julien Guinot, Alain Riou, Elio Quinton, Gy\"orgy Fazekas
https://arxiv.org/abs/2506.17815

SLAP: Siamese Language-Audio Pretraining Without Negative Samples for Music Understanding
Joint embedding spaces have significantly advanced music understanding and generation by linking text and audio through multimodal contrastive learning. However, these approaches face large memory requirement limitations due to relying on large batch sizes to effectively utilize negative samples. Further, multimodal joint embedding spaces suffer from a modality gap wherein embeddings from different modalities lie in different manifolds of the embedding space. To address these challenges, we pro…

Cowboys' Micah Parsons lies down amid contract issues, but snaps back at negative comments https://www.sportingnews.com/us/nfl/dallas-cowboys/news/cowboys-micah-parsons-lies-down-contr…

Diverse Negative Sampling for Implicit Collaborative Filtering
Yueqing Xuan, Kacper Sokol, Mark Sanderson, Jeffrey Chan
https://arxiv.org/abs/2508.14468 https://

Diverse Negative Sampling for Implicit Collaborative Filtering
Implicit collaborative filtering recommenders are usually trained to learn user positive preferences. Negative sampling, which selects informative negative items to form negative training data, plays a crucial role in this process. Since items are often clustered in the latent space, existing negative sampling strategies normally oversample negative items from the dense regions. This leads to homogeneous negative data and limited model expressiveness. In this paper, we propose Diverse Negative …

On Expansions of Monadic Second-Order Logic with Dynamical Predicates
Joris Nieuwveld, Jo\"el Ouaknine
https://arxiv.org/abs/2507.16581 https://

On Expansions of Monadic Second-Order Logic with Dynamical Predicates
Expansions of the monadic second-order (MSO) theory of the structure $\langle \mathbb{N} ; < \rangle$ have been a fertile and active area of research ever since the publication of the seminal papers of Büchi and Elgot & Rabin on the subject in the 1960s. In the present paper, we establish decidability of the MSO theory of $\langle \mathbb{N} ; <,P \rangle$, where $P$ ranges over a large class of unary ''dynamical'' predicates, i.e., sets of non-negative values assumed by certain integer linear…

Localization and splitting of a quantum droplet by immersing a heavy impurity
F. Bristy, G. A. Bougas, G. C. Katsimiga, S. I. Mistakidis
https://arxiv.org/abs/2506.19132

Localization and splitting of a quantum droplet by immersing a heavy impurity
We unravel the existence and nonequilibrium response of one-dimensional harmonically trapped droplet configurations in the presence of a central repulsive or attractive potential well mimicking the effect of a heavy impurity. For fixed negative chemical potentials, it is shown that droplets fragment into two for increasing repulsive potential heights, a process that occurs faster for larger widths. However, atoms from the droplet accumulate at the attractive potential, especially for wider ones…

Two-flavored heavy mesons' nuclear bound states
G. N. Zeminiani, S. L. P. G. Beres, K. Tsushima
https://arxiv.org/abs/2508.18261 https://arxiv.org/pdf/…

Two-flavored heavy mesons' nuclear bound states
We calculate the $B_c$- and $B_s$-nucleus bound state energies and coordinate space radial wave functions by solving the Klein-Gordon equation in momentum space. The attractive strong potentials for the $B_c$ and $B_s$ mesons in nuclei are calculated from the respective mass shifts of these mesons in nuclear matter using a local density approximation. This negative mass shift may be regarded as a signature of partial restoration of chiral symmetry in medium in an empirical sense, because the or…

Many of you already heard about this new algo that's faster than Dijkstra ( #python

Breaking the Sorting Barrier for Directed Single-Source Shortest Paths
We give a deterministic $O(m\log^{2/3}n)$-time algorithm for single-source shortest paths (SSSP) on directed graphs with real non-negative edge weights in the comparison-addition model. This is the first result to break the $O(m+n\log n)$ time bound of Dijkstra's algorithm on sparse graphs, showing that Dijkstra's algorithm is not optimal for SSSP.

Left-handed geodesic flow of spheres of revolution
Pierre Dehornoy, Ana Rechtman
https://arxiv.org/abs/2506.19979 https://arxiv.org/p…

Left-handed geodesic flow of spheres of revolution
A flow on a 3-manifold is left-handed if any two ergodic invariant measures have negative linking number. We prove that on a 2-sphere of revolution whose curvature is $1/4$-pinched the geodesic flow is left-handed. Conversely, for every $δ\le 1/4$, we construct a 2-sphere whose curvature is $δ$-pinched and whose geodesic flow is not left-handed. This gives credit to a conjecture of Florio and Hryniewicz that $1/4$ is the optimal pinching constant for left-handedness among arbitrary positively…

Negative intrinsic viscosity in graphene nanoparticle suspensions induced by hydrodynamic slip
Adyant Agrawal, Catherine Kamal, Simon Gravelle, Lorenzo Botto
https://arxiv.org/abs/2506.17397

Negative intrinsic viscosity in graphene nanoparticle suspensions induced by hydrodynamic slip
The viscosity of nanoparticle suspensions is always expected to increase with particle concentration. However, a growing body of experiments on suspensions of atomically thin nanomaterials such as graphene contradicts this expectation. Some experiments indicate effective suspension viscosity values that fall below that of pure solvent at high shear rates and low solid concentrations, i.e., the intrinsic viscosity is negative. To explain this puzzling phenomenon, we combined molecular dynamics a…

Do 1-dimensional metals prefer to form even-numbered van der Waals clusters ?
Subhojit Pal, John F. Dobson
https://arxiv.org/abs/2508.16214 https://arxiv.o…

Do 1-dimensional metals prefer to form even-numbered van der Waals clusters ?
Parallel quasi-one-dimensional metals are known to experience strong dispersion (van der Waals, vdW) interactions that fall off unusually slowly with separation between the metals. Examples include nanotube brushes, nano-wire arrays, and also common biological structures. In a many-stranded bundle, there are potentially strong multi-strand vdW interactions that go beyond a simple sum of negative (attractive) pairwise inter-strand energies. Perturbative analysis showed that these contributions a…

Undersmoothed LASSO Models for Propensity Score Weighting and Synthetic Negative Control Exposures for Bias Detection
Richard Wyss, Ben B. Hansen, Georg Hahn, Lars van der Laan, Joshua K. Lin
https://arxiv.org/abs/2506.17760

Undersmoothed LASSO Models for Propensity Score Weighting and Synthetic Negative Control Exposures for Bias Detection
The propensity score (PS) is often used to control for large numbers of covariates in high-dimensional healthcare database studies. The least absolute shrinkage and selection operator (LASSO) is a data-adaptive prediction algorithm that has become the most widely used tool for large-scale PS estimation in these settings. However, recent work has shown that the use of data-adaptive algorithms for PS estimation can come at the cost of slow convergence rates, resulting in PS-based causal estimator…

A class of high-beta, large-aspect-ratio quasiaxisymmetric Palumbo-like configurations
Andrew Brown, Wrick Sengupta, Nikita Nikulsin, Amitava Bhattacharjee
https://arxiv.org/abs/2506.17528

A class of high-beta, large-aspect-ratio quasiaxisymmetric Palumbo-like configurations
The space of high-beta, approximately quasiaxisymmetric, large-aspect-ratio stellarator configurations is explored using an inverse coordinate approach and a quadratic polynomial ansatz for the flux function, following the method of Palumbo, extended by Hernandes and Clemente. This approach yields a system of nonlinear ODEs that, when solved, give equilibria exhibiting positive or negative triangularity, cusps, and (in an extreme limit) current singularities. It is shown that a cubic ansatz may…

A vectorial Darboux transformation for integrable matrix versions of the Fokas-Lenells equation
Folkert M\"uller-Hoissen, Rusuo Ye
https://arxiv.org/abs/2508.17534 https://…

A vectorial Darboux transformation for integrable matrix versions of the Fokas-Lenells equation
Using bidifferential calculus, we derive a vectorial binary Darboux transformation for an integrable matrix version of the first negative flow of the Kaup-Newell hierarchy. A reduction from the latter system to an integrable matrix version of the Fokas-Lenells equation is then shown to inherit a corresponding vectorial Darboux transformation. Matrix soliton solutions are derived from the trivial seed solution. Furthermore, the Darboux transformation is exploited to determine in a systematic way…

50 years ago today, at 16:09 UTC on 17 July 1975, the Apollo-Soyuz Test Project culminated in the first docking of the spacecraft - but afterwards an interesting experiment took place: after they separated again Apollo (the final one; no number) occulted the Sun from the point of view of Soyuz 19. Images obtained show mostly outgassing from Apollo forward-scattering light from the hidden Sun but allegedly there is also some outer corona in the images of which #eclipse experiment was described in the mission press kit https://www.nasa.gov/wp-content/uploads/static/history/astp/documents/astp press kit (us).pdf on PDF pages 37-39 and the outcome is discussed in the didactical NASA brochure https://ntrs.nasa.gov/api/citations/19780019206/downloads/19780019206.pdf on PDF pages 20-27; there is apparently also a more technical paper in a mission science report but I couldn't find that one online.

Various thi.ng updates, bug fixes, additions and new version of https://github.com/thi-ng/zig-thing/ — now fully compatible with current Zig v0.14.1
On a more diary/devlog note: I also updated several of my Zig based work-in-progress art pieces to the latest version (some of them not touc…

Clustering-based hard negative sampling for supervised contrastive speaker verification
Piotr Masztalski, Micha{\l} Romaniuk, Jakub \.Zak, Mateusz Matuszewski, Konrad Kowalczyk
https://arxiv.org/abs/2507.17540

Clustering-based hard negative sampling for supervised contrastive speaker verification
In speaker verification, contrastive learning is gaining popularity as an alternative to the traditionally used classification-based approaches. Contrastive methods can benefit from an effective use of hard negative pairs, which are different-class samples particularly challenging for a verification model due to their similarity. In this paper, we propose CHNS - a clustering-based hard negative sampling method, dedicated for supervised contrastive speaker representation learning. Our approach c…

The Democratic Paradox in Large Language Models' Underestimation of Press Freedom
I. Loaiza, R. Vestrelli, A. Fronzetti Colladon, R. Rigobon
https://arxiv.org/abs/2506.18045

The Democratic Paradox in Large Language Models' Underestimation of Press Freedom
As Large Language Models (LLMs) increasingly mediate global information access for millions of users worldwide, their alignment and biases have the potential to shape public understanding and trust in fundamental democratic institutions, such as press freedom. In this study, we uncover three systematic distortions in the way six popular LLMs evaluate press freedom in 180 countries compared to expert assessments of the World Press Freedom Index (WPFI). The six LLMs exhibit a negative misalignmen…

Hyperbolic Casimir-like wormhole
Roberto Avalos, Ernesto Contreras, Daniel Brito, Ernesto Fuenmayor
https://arxiv.org/abs/2507.17906 https://arxiv.org/pdf/…

Hyperbolic Casimir-like wormhole
We present a systematic study of exact solutions for traversable wormhole geometries in a static and hyperbolic symmetric spacetime. In the conventional form of studying wormhole geometry, traversability requires the presence of exotic matter, which also provides negative gravity effects to keep the wormhole throat open. Using hyperbolic symmetry we obtain a solution already provided with negative energy density that replaces this effect and allows us to derive wormhole geometries that effectiv…

Signs to police 'negative' history went up at Manzanar. Historians are nervous. (Olivia Hebert/SFGATE)
https://www.sfgate.com/california-parks/article/signs-negative-history-manzanar-historians-20376758.php
http://www.memeorandum.com/250617/p178#a250617p178

It does have use cases (we use it for prototyping spatial experiences at work) but for mainstream use that is spot on. The tech doesn't work good enough to combat all the negative aspects that come with its usage.
https://mastodon.social/@anon_opin/114890146242778709

Long-lived SEC violation via DM/DE couplings
Gary Shiu, Flavio Tonioni, Hung V. Tran
https://arxiv.org/abs/2506.19914 https://arxiv.o…

Long-lived SEC violation via DM/DE couplings
We discuss a cosmological scenario where an effective violation of the strong energy condition (SEC) is realized through a coupling between SEC-fulfilling dark matter (DM) and dark energy (DE). Although the SEC-violating solutions might in principle last for an arbitrarily long time, we highlight several challenges that string realizations must face: most notably, the identification of suitable heavy states and their relationship with the theory cutoff. We also discuss negative potentials in th…

Predicting Stock Market Crash with Bayesian Generalised Pareto Regression
Sourish Das
https://arxiv.org/abs/2506.17549 https://arxiv.…

Predicting Stock Market Crash with Bayesian Generalised Pareto Regression
This paper develops a Bayesian Generalised Pareto Regression (GPR) model to forecast extreme losses in Indian equity markets, with a focus on the Nifty 50 index. Extreme negative returns, though rare, can cause significant financial disruption, and accurate modelling of such events is essential for effective risk management. Traditional Generalised Pareto Distribution (GPD) models often ignore market conditions; in contrast, our framework links the scale parameter to covariates using a log-line…

On the space of metrics with non-positive curvature
Yasha Savelyev
https://arxiv.org/abs/2506.19983 https://arxiv.org/pdf/2506.19983

On the space of metrics with non-positive curvature
Let $\mathcal{M} (X)$ denote the space of complete Riemannian metrics with non-positive sectional curvature and with negatively curved ends, on a manifold $X$. We show that $\mathcal{M} (\mathbb{R} \times S ^{1}) $ and $\mathcal{M} (\mathbb{R} ^{} \times Y)$ are path disconnected, where $Y$ is compact and admits a negative curvature metric. The proof is very concise, using as the main ingredient Fuller index theory. Furthermore, we get a new metric deformation invariant based on geodesic string…

Hilbert basis in the face-centered cubic grid -- mathematical proofs
Bela Vizvari, Gergely Kovacs, Benedek Nagy, Necet Deniz Turgay
https://arxiv.org/abs/2507.16464

Hilbert basis in the face-centered cubic grid -- mathematical proofs
The Hilbert basis is fundamental in describing the structure of the integer points of a polyhedral cone. The face-centered cubic grid is one of the densest packing of the 3-dimensional space. The cycles of a grid satisfy the constraint set of a pointed, polyhedral cone which contains only non-negative integer vectors. The Hilbert basis of a grid gives the structure of the basic cycles in the grid. It is shown in this paper that the basic cycles of the FCC grid belong to 11 types. It is also dis…

People handing in comments for my blog don't want to have their name/nick added because they fear negative consequences by #reddit administrators. 😲 🤦‍♂️
This is also why I wrote:
https://karl-voit.at/2020/10/23/avoid-…

Reliable Unlearning Harmful Information in LLMs with Metamorphosis Representation Projection
Chengcan Wu, Zeming Wei, Huanran Chen, Yinpeng Dong, Meng Sun
https://arxiv.org/abs/2508.15449

Reliable Unlearning Harmful Information in LLMs with Metamorphosis Representation Projection
While Large Language Models (LLMs) have demonstrated impressive performance in various domains and tasks, concerns about their safety are becoming increasingly severe. In particular, since models may store unsafe knowledge internally, machine unlearning has emerged as a representative paradigm to ensure model safety. Existing approaches employ various training techniques, such as gradient ascent and negative preference optimization, in attempts to eliminate the influence of undesired data on ta…

Investigating the Anti-Correlation between Photon Index and Flux of the Crab using RXTE and NuSTAR
Debjit Chatterjee, Hsiang-Kuang Chang, Dipak Debnath, Koothodil Abhijith Augustine, Tzu-Hsuan Lin
https://arxiv.org/abs/2506.17899

Investigating the Anti-Correlation between Photon Index and Flux of the Crab using RXTE and NuSTAR
We present a systematic study of the recently reported anti-correlation between X-ray flux and photon index ($Γ$) in the Crab Nebula, using archival RXTE/PCA (3 - 50 keV), RXTE/HEXTE (20 - 100 keV), and NuSTAR (3 - 78 keV) observations. Spectra were extracted in soft (3 - 10 keV) and hard bands (10 - 50 keV, 10 - 78 keV, 20 - 100 keV) and fitted with an absorbed power-law model. Across all instruments and energy ranges, we confirm the existence of a persistent negative correlation -- harder sp…

🧓 Older adults are more psychologically resistant to cyberbullying, student-led research finds
https://medicalxpress.com/news/2025-08-older-adults-psychologically-resistant-cyberbullying.html

Older adults are more psychologically resistant to cyberbullying, student-led research finds
Undergraduate-led research from the University of Warwick has found that older adults are less emotionally affected by negative social media comments.

Generalized decomposition integral of real functions with respect to fuzzy measures
Anca Croitoru, Alina Iosif, Anna Rita Sambucini
https://arxiv.org/abs/2507.17237 https://

Generalized decomposition integral of real functions with respect to fuzzy measures
In this paper we define a type of generalized Riemann-Lebesgue (decomposition) integral for non-negative real functions with respect to two non-additive set functions. For this integral we present some classical properties.

Can Recombination Displace Dominant Scientific Ideas
Linzhuo Li, Yiling Lin, Lingfei Wu
https://arxiv.org/abs/2506.15959 https://arxi…

Can Recombination Displace Dominant Scientific Ideas
Scientific breakthroughs are widely attributed to the novel recombination of existing ideas. Yet despite explosive global growth in scientific labor and publications -- creating more opportunities to reconfigure knowledge -- the rate of breakthroughs has not kept pace. To investigate this disconnect, we analyze 49 million scholarly works from 1960 to 2024 using measures of atypical recombination and disruptive innovation. Contrary to recombination theories, we find a robust negative correlation…

Smoothing topological pseudo-isotopies of 4-manifolds
Patrick Orson, Mark Powell, Oscar Randal-Williams
https://arxiv.org/abs/2507.16984 https://arxiv.org/…

Smoothing topological pseudo-isotopies of 4-manifolds
Given a closed, smooth 4-manifold $X$ and self-diffeomorphism $f$ that is topologically pseudo-isotopic to the identity, we study the question of whether $f$ is moreover smoothly pseudo-isotopic to the identity. If the fundamental group of $X$ lies in a certain class, which includes trivial, free, and finite groups of odd order, we show the answer is always affirmative. On the other hand, we produce the first examples of manifolds $X$ and diffeomorphisms $f$ where the answer is negative. Our in…

The Expressions of Depression and Anxiety in Chinese Psycho-counseling: Usage of First-person Singular Pronoun and Negative Emotional Words
Lizhi Ma, Tong Zhao, Shuai Zhang, Nirui Song, Hongliang He, Anqi Li, Ran Feng, Huachuan Qiu, Jingsong Ma, Zhenzhong Lan
https://arxiv.org/abs/2507.13839…

The Expressions of Depression and Anxiety in Chinese Psycho-counseling: Usage of First-person Singular Pronoun and Negative Emotional Words
This study explores the relationship between linguistic expressions and psychological states of depression and anxiety within Chinese psycho-counseling interactions, focusing specifically on the usage of first-person singular pronouns and negative emotional words. Utilizing a corpus derived from 735 online counseling sessions, the analysis employed a general linear mixed-effect model to assess linguistic patterns quantified by the Linguistic Inquiry and Word Count (LIWC) software. Results indic…

CASPER: Contrastive Approach for Smart Ponzi Scheme Detecter with More Negative Samples
Weijia Yang, Tian Lan, Leyuan Liu, Wei Chen, Tianqing Zhu, Sheng Wen, Xiaosong Zhang
https://arxiv.org/abs/2507.16840

CASPER: Contrastive Approach for Smart Ponzi Scheme Detecter with More Negative Samples
The rapid evolution of digital currency trading, fueled by the integration of blockchain technology, has led to both innovation and the emergence of smart Ponzi schemes. A smart Ponzi scheme is a fraudulent investment operation in smart contract that uses funds from new investors to pay returns to earlier investors. Traditional Ponzi scheme detection methods based on deep learning typically rely on fully supervised models, which require large amounts of labeled data. However, such data is often…

Bayesian Non-Negative Matrix Factorization with Correlated Mutation Type Probabilities for Mutational Signatures
Iris Lang, Jenna Landy, Giovanni Parmigiani
https://arxiv.org/abs/2506.15855

Bayesian Non-Negative Matrix Factorization with Correlated Mutation Type Probabilities for Mutational Signatures
Somatic mutations, or alterations in DNA of a somatic cell, are key markers of cancer. In recent years, mutational signature analysis has become a prominent field of study within cancer research, commonly with Nonnegative Matrix Factorization (NMF) and Bayesian NMF. However, current methods assume independence across mutation types in the signatures matrix. This paper expands upon current Bayesian NMF methodologies by proposing novel methods that account for the dependencies between the mutatio…

From @… 5 Things AM August 20, 2025:
#news #CNN #censorship

Towards a Real LZC Low/Zero-Carbon UK Home (2007) - Can we really go zero-carbon or negative-carbon in an existing home near London? #lowCarbon #home #microgen -

Towards a Real LZC Low/Zero-Carbon UK Home (2007)
Can we really go zero-carbon or negative-carbon in an existing home near London? #lowCarbon #home #microgen

Homeowner sees negative energy bill after leasing solar panels - a glimpse into the future of sustainable energy. #climatechange #climatesolutions #climate

Homeowner reveals massive negative energy bill after leasing solar panels: '[The] panels are producing way more than ... estimated'
One homeowner proved that you can get a negative energy bill with solar panels.

@… for me it’s super fascinating (I don’t mean this in a negative way) that it seems to be that we’re talking about things people work on outside of work

Non-existence of negative derivations on the higher Nash blowup local algebra
W\'agner Badilla-C\'espedes, Abel Castorena, Daniel Duarte, Luis N\'u\~nez-Betancourt
https://arxiv.org/abs/2508.14353

Non-existence of negative derivations on the higher Nash blowup local algebra
Let $f\in\mathbb{C}[x_1,\ldots,x_s]$ be a weighted homogeneous polynomial having an isolated singularity and $\mathcal{T}_n(f)$ be its higher Nash blowup local algebra. We show that $\mathcal{T}_n(f)$ does not admit negative weighted derivations for $n\geq2$. This answers affirmatively a conjecture of Hussain-Ma-Yau-Zuo.

#Worldcon ended on Sunday. I just tested negative for #COVID and #Flu (combined test).

Original negative for Romero's Day of the Dead, long thought missing, has been found and is being restored for 4K UHD release #horror

Scream Factory Resurrects Romero's DAY OF THE DEAD For 4K UHD Restoration
Good news, zombie fans - the original film elements for George A. Romero's DAY OF THE DEAD have officially been unearthed by Scream Factory, with a 4K UHD restoration coming soon.

The exact region and an inequality between Chatterjee's and Spearman's rank correlations
Jonathan Ansari, Marcus Rockel
https://arxiv.org/abs/2506.15897

The exact region and an inequality between Chatterjee's and Spearman's rank correlations
The rank correlation xi(X,Y), recently introduced by Chatterjee [12] and already popular in the statistics literature, takes values in [0,1], where 0 characterizes independence of X and Y, and 1 characterizes perfect dependence of Y on X. Unlike classical concordance measures such as Spearman's rho, which capture the degree of positive or negative dependence, xi quantifies the strength of functional dependence. In this paper, we determine, for each fixed value of xi, the full range of possible …

Serrin-type problem in divergence form on Riemannian manifolds
M\'arcio Batista, M\'arcio Santos, Ant\^onio da Silva, Joyce Sindeaux
https://arxiv.org/abs/2507.17838 htt…

Serrin-type problem in divergence form on Riemannian manifolds
In this paper, we investigate an overdetermined boundary value problem of divergence type on bounded domains in Riemannian manifolds with non-negative Ricci curvature. Using integral identities and the $P$-function method, we derive geometric inequalities and rigidity results. Under natural conditions on the nonlinearity, we prove that equality implies the domain is isometric to a Euclidean ball, thereby extending classical symmetry results to the Riemannian setting.

On oriented $m$-semiregular representations of finite groups about valency three
Songnian Xu, Dein Wong, Chi Zhang, Jinxing Zhao
https://arxiv.org/abs/2507.15405

On oriented $m$-semiregular representations of finite groups about valency three
Let $G$ be a group and $m$ a positive integer. We say an $m$-Cayley digraph $Γ$ over $G$ is a digraph that admits a group of automorphisms isomorphic to $G$ acting semiregularly on the vertex set with $m$ orbits. The digraph $Σ$ is $k$-regular if there exists a non-negative integer $k$ such that every vertex has out-valency and in-valency equal to $k$. All digraphs considered in this paper are regular. We say that $G$ admits an oriented $m$-semiregular representation (abbreviated as OmSR) if …

Elastic Buffer Design for Real-Time All-Digital Clock Recovery Enabling Free-Running Receiver Clock with Negative and Positive Clock Frequency Offsets
Patrick Matalla, Joel Dittmer, Md Salek Mahmud, Christian Koos, Sebastian Randel
https://arxiv.org/abs/2507.13748

Elastic Buffer Design for Real-Time All-Digital Clock Recovery Enabling Free-Running Receiver Clock with Negative and Positive Clock Frequency Offsets
We present an elastic buffer design that enables all-digital clock recovery implementation with free-running receiver clock featuring negative and positive clock frequency offsets. Error-free real-time data transmission is demonstrated from -400 ppm to +400 ppm.

Cosmological perturbations for smooth sign-switching dark energy models
Mariam Bouhmadi-L\'opez, Be\~nat Ibarra-Uriondo
https://arxiv.org/abs/2506.18992

Cosmological perturbations for smooth sign-switching dark energy models
In this work, we carry out a comprehensive perturbative analysis of four cosmological models featuring a sign-switching cosmological constant. Among these, we include the well-known $Λ_{\rm s}$CDM model, characterised by an abrupt transition from a negative to a positive cosmological constant. We also consider the L$Λ$CDM model, which exhibits a generalised ladder-step evolution, as well as the SSCDM and ECDM models, both of which undergo a smooth sign change at comparable redshifts. We solve…

Aktueller Titel: Type O Negative – Be My Druidess
#DunkleEchos – jetzt live bei https://www.mixcloud.com/live/thopan

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ASML reports Q2 net sales of €7.7B, net income of €2.29B, and net bookings of €5.5B vs. €4.19B est., with tariffs having a "less negative" impact than expected (Arjun Kharpal/CNBC)
https://www.cnbc.com/2025/07/16/asml-q2-2025-earnings-report.html

Chip giant ASML says it can't confirm that it will grow in 2026
ASML reported second-quarter earnings that beat estimates with the its key net bookings figure ahead of consensus.

Physical parameter regression from black hole images via a multiscale adaptive neural network
Jialei Wei, Ao Liu, Dejiang Li, Cuihong Wen
https://arxiv.org/abs/2507.15910

Physical parameter regression from black hole images via a multiscale adaptive neural network
High-precision regression of physical parameters from black hole images generated by General Relativistic Ray Tracing (GRRT) is essential for investigating spacetime curvature and advancing black hole astrophysics. However, due to limitations in observational resolution, high observational costs, and imbalanced distributions of positive and negative samples, black hole images often suffer from data scarcity, sparse parameter spaces, and complex structural characteristics. These factors pose sig…

On the extremal functions of second order uncertainty principles: symmetry and symmetry breaking
Xiao-Ping Chen, Chun-Lei Tang
https://arxiv.org/abs/2508.15221 https://

On the extremal functions of second order uncertainty principles: symmetry and symmetry breaking
This paper focus on the symmetry and symmetry breaking about the second order Hydrogen Uncertainty Principle. \emph{Firstly}, by choosing a suitable test function, we give a negative answer to the conjecture presented by Cazacu, Flynn and Lam in [\emph{J. Funct. Anal.} \textbf{283} (2022), Paper No. 109659, 37 pp] for $N\in\{2,3\}$, and emphasizing the symmetry breaking phenomenon. \emph{Secondly}, we obtain a family of sharp weighted second order Hydrogen Uncertainty Principle, and prove the e…

Benefiting from Negative yet Informative Feedback by Contrasting Opposing Sequential Patterns
Veronika Ivanova, Evgeny Frolov, Alexey Vasilev
https://arxiv.org/abs/2508.14786 ht…

Benefiting from Negative yet Informative Feedback by Contrasting Opposing Sequential Patterns
We consider the task of learning from both positive and negative feedback in a sequential recommendation scenario, as both types of feedback are often present in user interactions. Meanwhile, conventional sequential learning models usually focus on considering and predicting positive interactions, ignoring that reducing items with negative feedback in recommendations improves user satisfaction with the service. Moreover, the negative feedback can potentially provide a useful signal for more acc…

On the Structure of Busemann Spaces with Non-Negative Curvature
Bang-Xian Han, Liming Yin
https://arxiv.org/abs/2508.12348 https://arxiv.org/pdf/2508.12348…

On the Structure of Busemann Spaces with Non-Negative Curvature
We extend the structure theory of Burago--Gromov--Perelman for Alexandrov spaces with curvature bounded below, to the setting of Busemann spaces with non-negative curvature. We prove that any finite-dimensional Busemann space with non-negative curvature satisfying Ohta's $S$-concavity and local semi-convexity, admits a non-trivial integer-dimensional Hausdorff measure, and satisfies the measure contraction property. We also show that such spaces are rectifiable and that almost every point admit…

Filtrations Indexed by Attracting Levels and their Applications
Yusuke Imoto, Tomoo Yokoyama
https://arxiv.org/abs/2506.18250 https://

Filtrations Indexed by Attracting Levels and their Applications
In this paper, we introduce a framework for constructing two types of filtrations with respect to a reference object akin to an attractor. The forward directions of the filtrations characterize the level of control required to approach the attractor. The negative directions of the filtrations capture the robustness of the ``basin'' by quantifying how much perturbations can be tolerated without altering the tendency to be attracted to a given attractor. Furthermore, to accommodate real-world phe…

Tuning chiral anomaly signature in a Dirac semimetal via fast-ion implantation
Manasi Mandal, Eunbi Rha, Abhijatmedhi Chotrattanapituk, Denisse C\'ordova Carrizales, Alexander Lygo, Kevin B. Woller, Mouyang Cheng, Ryotaro Okabe, Guomin Zhu, Kiran Mak, Chu-Liang Fu, Chuhang Liu, Lijun Wu, Yimei Zhu, Susanne Stemmer, Mingda Li
https://ar…

Tuning chiral anomaly signature in a Dirac semimetal via fast-ion implantation
Cd$_3$As$_2$ is a prototypical Dirac semimetal that hosts a chiral anomaly and thereby functions as a platform to test high-energy physics hypotheses and to realize energy efficient applications. Here we use a combination of accelerator-based fast ion implantation and theory-driven planning to enhance the negative longitudinal magnetoresistance (NLMR)--a signature of a chiral anomaly--in Nb-doped Cd$_3$As$_2$ thin films. High-energy ion implantation is commonly used to investigate semiconductor…

AI, Expert or Peer? -- Examining the Impact of Perceived Feedback Source on Pre-Service Teachers Feedback Perception and Uptake
Lucas Jasper Jacobsen, Ute Mertens, Thorben Jansen, Kira Elena Weber
https://arxiv.org/abs/2507.16013

AI, Expert or Peer? -- Examining the Impact of Perceived Feedback Source on Pre-Service Teachers Feedback Perception and Uptake
Feedback plays a central role in learning, yet pre-service teachers' engagement with feedback depends not only on its quality but also on their perception of the feedback content and source. Large Language Models (LLMs) are increasingly used to provide educational feedback; however, negative perceptions may limit their practical use, and little is known about how pre-service teachers' perceptions and behavioral responses differ by feedback source. This study investigates how the perceived sourc…

Novel duality-invariant theories of electrodynamics
\'Angel J. Murcia
https://arxiv.org/abs/2507.16502 https://arxiv.org/pdf/2507…

Novel duality-invariant theories of electrodynamics
We identify new families of duality-invariant theories of electrodynamics. We achieve this in two different ways. On the one hand, we present an algorithm to construct a one-parameter family of exactly duality-invariant theories from a single seed duality-invariant theory. If the seed theory is causal, the theories constructed from this method will also be causal when the parameter is non-negative. On the other hand, we find two additional novel families of duality-invariant theories which incl…

Optimizing Legal Document Retrieval in Vietnamese with Semi-Hard Negative Mining
Van-Hoang Le, Duc-Vu Nguyen, Kiet Van Nguyen, Ngan Luu-Thuy Nguyen
https://arxiv.org/abs/2507.14619

Optimizing Legal Document Retrieval in Vietnamese with Semi-Hard Negative Mining
Large Language Models (LLMs) face significant challenges in specialized domains like law, where precision and domain-specific knowledge are critical. This paper presents a streamlined two-stage framework consisting of Retrieval and Re-ranking to enhance legal document retrieval efficiency and accuracy. Our approach employs a fine-tuned Bi-Encoder for rapid candidate retrieval, followed by a Cross-Encoder for precise re-ranking, both optimized through strategic negative example mining. Key innov…

Non-negative curvature on certain product manifolds
Wen Shen
https://arxiv.org/abs/2508.15194 https://arxiv.org/pdf/2508.15194

Non-negative curvature on certain product manifolds
Let $G/H$ be a closed, simply connected homogeneous manifold. Suppose every stable class of real vector bundles over $G/H$ contains a homogeneous bundle. Then, for any closed, simply connected smooth manifold $M$ homotopy equivalent to $G/H$, there exists $n>\mathrm{dim}(M)$ such that the product manifold $M\times S^{n}$ admits a metric with non-negative sectional curvature. Many homogeneous manifolds satisfy this assumption, including simply connected compact rank-one symmetric spaces, and amo…

Nesting behind $\hat{Z}$-invariants
Shoma Sugimoto
https://arxiv.org/abs/2507.13996 https://arxiv.org/pdf/2507.13996

Nesting behind $\hat{Z}$-invariants
In the spirit of arXiv:2501.12985, we propose an abelian categorification of $\hat{Z}$-invariants for negative definite plumbed 3-manifolds. It provides a blueprint for the expected dictionary between these $3$-manifolds and log VOAs; that is, the contribution from 3d $\mathcal{N}=2$ theory via 3d-3d correspondence is recursively binary encoded in the abelian category of modules over the hypothetical log VOA, and is decoded by the recursive application of the theory of Feigin--Tipunin construct…

Crosslisted article(s) found for math.GT. https://arxiv.org/list/math.GT/new
[1/1]:
- Non-negative curvature on certain product manifolds
Wen Shen
https://

Negative capacitance overcomes Schottky-gate limits in GaN high-electron-mobility transistors
Asir Intisar Khan, Jeong-Kyu Kim, Urmita Sikder, Koushik Das, Thomas Rodriguez, Rohith Soman, Srabanti Chowdhury, Sayeef Salahuddin
https://arxiv.org/abs/2506.16758

Negative capacitance overcomes Schottky-gate limits in GaN high-electron-mobility transistors
For high-electron-mobility transistors based on two-dimensional electron gas (2DEG) within a quantum well, such as those based on AlGaN/GaN heterostructure, a Schottky-gate is used to maximize the amount of charge that can be induced and thereby the current that can be achieved. However, the Schottky-gate also leads to very high leakage current through the gate electrode. Adding a conventional dielectric layer between the nitride layers and gate metal can reduce leakage; but this comes at the p…

Envelopes of lines, unfoldings and breaking symmetry
Peter Giblin, Alexander Wettig
https://arxiv.org/abs/2506.16547 https://arxiv.or…

Envelopes of lines, unfoldings and breaking symmetry
We generalise the well-known ``embroidery'' envelopes of chords joining points at angles $t$ and $mt$ of a single circle in several ways. Firstly we allow $m$ to be rational (possibly negative) instead of integral, finding formulas for the number of cusps, points at infinity and self-intersections of these envelopes. Secondly we use two concentric circles instead of one, taking the chords to join a point of one circle to a point of the other. This construction allows the formation of different …

Asymmetry in momentum space: restoring CPT invariance of $\kappa$-field theory
Tadeusz Adach, Andrea Bevilacqua, Jerzy Kowalski-Glikman, Giacomo Rosati
https://arxiv.org/abs/2507.16187

Asymmetry in momentum space: restoring CPT invariance of $κ$-field theory
The positive and negative energy modes of a field theory in $κ$-Minkowski/$κ$-Poincaré noncommutative spacetime have very different symmetry properties. This can be understood geometrically by considering that they span two distinct sectors of a curved momentum space. It seems that because of this asymmetry, charge conjugation and Poincaré invariance are incompatible. However, the structure of momentum space suggests that time reversal could be deformed so that the overall CPT-invariance is…

Replaced article(s) found for cs.IR. https://arxiv.org/list/cs.IR/new
[1/1]:
- Generating Negative Samples for Multi-Modal Recommendation
Yanbiao Ji, Dan Luo, Chang Liu, Shaokai Wu, Jing Tong, Qicheng He, Deyi Ji, Hongtao Lu, Yue Ding

A Multidimensional Birkhoff Theorem for Recurrent Lagrangian Submanifolds by a Tonelli Hamiltonian
Skander Charfi
https://arxiv.org/abs/2507.14561 https://…

A Multidimensional Birkhoff Theorem for Recurrent Lagrangian Submanifolds by a Tonelli Hamiltonian
Consider a closed manifold $M$ and a time-periodic Tonelli Hamiltonian $H : \mathbb{R}/\mathbb{Z} \times T^*M \to \mathbb{R}$ with flow $ϕ_H$. Let $\mathcal{L} \subset T^*M$ be a Lagrangian submanifold Hamiltonianly isotopic to the zero section. We prove that if $ϕ_H^n(\mathcal{L})$ admits convergent subsequences in both positive and negative times, in the Hausdorff topology and with control on the Liouville primitives, to two Lagrangian submanifolds, then $\mathcal{L}$ is a graph over the ze…

General form for Pseudo-Newtonian Potentials, imitating Schwarzschild geodesics
Itamar Ben Arosh Arad, Reem Sari
https://arxiv.org/abs/2507.15107 https://

General form for Pseudo-Newtonian Potentials, imitating Schwarzschild geodesics
We propose a new, general form for a pseudo-Newtonian gravitational potential (PNP), expressed as a series of Paczyński-Wiita-like functions with the addition of increasing negative powers of $r$ with arbitrary coefficients. We present a procedure for determining these coefficients to construct a custom PNP that replicates key features of Schwarzschild geodesics for a test particle near a black hole. As an example, we construct potentials set to reproduce (I) the presence of an innermost stabl…

Special vector fields on Riemannian manifolds of constant negative sectional curvature and conservation laws
Keti Tenenblat, Alice Barbora Tumpach
https://arxiv.org/abs/2506.14960

Special vector fields on Riemannian manifolds of constant negative sectional curvature and conservation laws
We show that any $n$-dimensional Riemannian manifold with constant negative sectional curvature admits local orthonormal vector fields such that one of them $v_1$ is tangent to geodesics and the other $n-1$ vector fields are tangent to horocycles. We prove that the $1$-form dual to $v_1$ is a closed form. We show how the closed form can be used to obtain conservation laws for PDEs whose generic solutions define metrics on open subsets with constant negative sectional curvature. These results ex…