Tootfinder

CXL-GPU: Pushing GPU Memory Boundaries with the Integration of CXL Technologies
Donghyun Gouk, Seungkwan Kang, Seungjun Lee, Jiseon Kim, Kyungkuk Nam, Eojin Ryu, Sangwon Lee, Dongpyung Kim, Junhyeok Jang, Hanyeoreum Bae, Myoungsoo Jung
https://arxiv.org/abs/2506.15601

CXL-GPU: Pushing GPU Memory Boundaries with the Integration of CXL Technologies
This work introduces a GPU storage expansion solution utilizing CXL, featuring a novel GPU system design with multiple CXL root ports for integrating diverse storage media (DRAMs and/or SSDs). We developed and siliconized a custom CXL controller integrated at the hardware RTL level, achieving two-digit nanosecond roundtrip latency, the first in the field. This study also includes speculative read and deterministic store mechanisms to efficiently manage read and write operations to hide the endp…

Replaced article(s) found for cs.AI. https://arxiv.org/list/cs.AI/new
[2/5]:
- Advancing oncology with federated learning: transcending boundaries in breast, lung, and prostate...
Anshu Ankolekar, et al.

Estimates for viscosity solutions of fully nonlinear equations near smooth boundaries
Niklas L. P. Lundstr\"om, Marcus Olofsson, Jesper Singh
https://arxiv.org/abs/2506.12477

Estimates for viscosity solutions of fully nonlinear equations near smooth boundaries
We reduce the problem of proving decay estimates for viscosity solutions of fully nonlinear PDEs to proving analogous estimates for solutions of one-dimensional ordinary differential inequalities. Our machinery allow the ellipticity to vanish near the boundary and permits general, possibly unbounded, lower-order terms. A key consequence is the derivation of boundary Harnack inequalities for a broad class of fully nonlinear, nonhomogeneous equations near $C^{1,1}$-boundaries. In combination wi…

Atomic-scale insights on grain boundary segregation in a cathode battery material
Inger-Emma Nylund, Elise R. Eilertsen, Constantinos A. Hatzoglou, Kaja Eggen Aune, Ruben Bj{\o}rge, Antonius T. J. van Helvoort, Ann Mari Svensson, Paraskevas Kontis
https://arxiv.org/abs/2506.13940

Atomic-scale insights on grain boundary segregation in a cathode battery material
The grain boundary segregation of the Co-free pristine spinel LiNi0.5Mn1.5O4 cathode material has been studied by transmission electron microscopy and atom probe tomography. The segregation of Mn and the depletion of Ni at grain boundaries was observed by electron energy loss spectroscopy. These observations were also confirmed by atom probe tomography at other grain boundaries, which also revealed segregation of O and depletion of Li at grain boundaries. In addition, both methods revealed the …

Visual metrics on boundaries of hyperbolic spaces
Emily Stark
https://arxiv.org/abs/2506.10108 https://arxiv.org/pdf/2506.10108

Visual metrics on boundaries of hyperbolic spaces
This is an expository article on visual metrics on boundaries of hyperbolic metric spaces. We discuss the construction of visual metrics, quasisymmetries and their invariants, Hausdorff and conformal dimension, and constructions and applications of Gromov's round trees. There is a focus on providing examples throughout. These notes are based on the material of a minicourse given by the author at the 2024 Riverside Workshop in Geometric Group Theory.

MS-UMamba: An Improved Vision Mamba Unet for Fetal Abdominal Medical Image Segmentation
Caixu Xu, Junming Wei, Huizhen Chen, Pengchen Liang, Bocheng Liang, Ying Tan, Xintong Wei
https://arxiv.org/abs/2506.12441

MS-UMamba: An Improved Vision Mamba Unet for Fetal Abdominal Medical Image Segmentation
Recently, Mamba-based methods have become popular in medical image segmentation due to their lightweight design and long-range dependency modeling capabilities. However, current segmentation methods frequently encounter challenges in fetal ultrasound images, such as enclosed anatomical structures, blurred boundaries, and small anatomical structures. To address the need for balancing local feature extraction and global context modeling, we propose MS-UMamba, a novel hybrid convolutional-mamba mo…

Moebius: The Artist Who Pushed the Boundaries of Our Imagination | TheCollector https://www.thecollector.com/moebius-artist-pushed-boundaries-our-imagination/

Moebius: The Artist Who Pushed the Boundaries of Our Imagination | TheCollector
The world of comic books, nowadays greatly respected for its artistic and narrative values, owes so much to the artistry, the imagination, and the uniqueness of Moebius.

Bureaucracy's Boundaries -- Breaking down the legal issues surrounding the White House's terminations ... (Anne Joseph O'Connell/Lawfare)
https://www.lawfaremedia.org/article/bureaucracy-s-boundaries
http://www.memeorandum.com/250605/p119#a250605p119

Versatile SPH Open Boundary Conditions for Multiphase Flows in Extreme Condition
Zi-Yang Zhan, Zhen Chen
https://arxiv.org/abs/2506.14500 https://

Versatile SPH Open Boundary Conditions for Multiphase Flows in Extreme Condition
Although the Smoothed Particle Hydrodynamics (SPH) method has been demonstrated as a promising numerical solver for multiphase flow problems due to its Lagrangian nature, its application to complex channel flow may encounter additional issues such as the open boundary condition and numerical instability in the extreme flow state. The present work aims to establish a general SPH algorithm for accurate and stable simulation of complex multiphase flows in configurations with open boundaries. The g…

🇺🇦 #NowPlaying on KEXP's #VarietyMix
Kaitlyn Aurelia Smith:
🎵 Unbraiding Boundless Energy Within Boundaries
#KaitlynAureliaSmith
https://kaitlynaureliasmith.bandcamp.com/track/unbraiding-boundless-energy-within-boundaries
https://open.spotify.com/track/4TV3fpMUu9GD8HUwI1r5UN

From Intention to Execution: Probing the Generalization Boundaries of Vision-Language-Action Models
Irving Fang, Juexiao Zhang, Shengbang Tong, Chen Feng
https://arxiv.org/abs/2506.09930

From Intention to Execution: Probing the Generalization Boundaries of Vision-Language-Action Models
One promise that Vision-Language-Action (VLA) models hold over traditional imitation learning for robotics is to leverage the broad generalization capabilities of large Vision-Language Models (VLMs) to produce versatile, "generalist" robot policies. However, current evaluations of VLAs remain insufficient. Traditional imitation learning benchmarks are unsuitable due to the lack of language instructions. Emerging benchmarks for VLAs that incorporate language often come with limited evaluation ta…

🚀 𝘀𝗽𝗮𝗻𝗶𝘀𝗵𝗼𝗱𝗱𝗮𝘁𝗮 0.2.0 is here. As before, you are getting nicely formatted Open Mobility Big Data released by the Spanish Ministry of Transport and Sustainable Mobility (MITMS) in a reproducible way. #rstats #opendata

Get Spanish Origin-Destination Data
Gain seamless access to origin-destination (OD) data from the Spanish Ministry of Transport, hosted at . This package simplifies the management of these large datasets by providing tools to download zone boundaries, handle associated origin-destination data, and process it efficiently with the duckdb database interface. Local caching minimizes repeated downloads, streamlining wo…

I am not an elevator pitch.
I don't have clear, clean boundaries.
My #art has always been more MacGyver than artisan.
Full thought: https://fromemily.com/feedbackless-fee

Reduced-Order Time Splitting for Navier-Stokes with Open Boundaries
Mejdi Aza\"iez, Tom\'as Chac\'on Rebollo, Carlos N\'u\~nez Fern\'andez, Samuele Rubino
https://arxiv.org/abs/2506.10763

Reduced-Order Time Splitting for Navier-Stokes with Open Boundaries
In this work, we propose a Proper Orthogonal Decomposition-Reduced Order Model (POD-ROM) applied to time-splitting schemes for solving the Navier-Stokes equations with open boundary conditions. In this method, we combine three strategies to reduce the computing time to solve NSE: time splitting, reduction of the computational domain through non-standard treatment of open boundary conditions and reduced order modelling. To make the work self-contained, we first present the formulation of the tim…

Engineering teams often get stuck striving for perfection, not out of laziness, but due to an insatiable desire to improve. Join Tim Schmolka next week at Berlin Buzzwords to discover how teams can overcome perfectionism. He will discuss the significance of setting clear boundaries, balancing quality with timely delivery, and focusing on what truly matters.
Learn more:

The Perfection Trap
Many engineering teams face a common struggle: the desire to deliver perfect solutions can delay projects and limit business impact. This session explores how the familiar Parkinson’s Law is often misunderstood in engineering contexts. Instead of laziness, it’s excessive craftsmanship and relentless perfectionism that extend timelines. Through real-world examples and practical insights, you’ll learn about the “perfection pressure spectrum,” which helps diagnose whether your team is st…

Image Processing Techniques to Identify and Quantify Spatiotemporal Carbon Cycle Extremes
Bharat Sharma, Jitendra Kumar, Auroop R. Ganguly, Forrest M. Hoffman
https://arxiv.org/abs/2506.15555

Image Processing Techniques to Identify and Quantify Spatiotemporal Carbon Cycle Extremes
Rising atmospheric carbon dioxide due to human activities through fossil fuel emissions and land use changes have increased climate extremes such as heat waves and droughts that have led to and are expected to increase the occurrence of carbon cycle extremes. Carbon cycle extremes represent large anomalies in the carbon cycle that are associated with gains or losses in carbon uptake. Carbon cycle extremes could be continuous in space and time and cross political boundaries. Here, we present a m…

Boundary-Informed Sound Field Reconstruction
David Sundstr\"om, Filip Elvander, Andreas Jakobsson
https://arxiv.org/abs/2506.13279 https://

Boundary-Informed Sound Field Reconstruction
We consider the problem of reconstructing the sound field in a room using prior information of the boundary geometry, represented as a point cloud. In general, when no boundary information is available, an accurate sound field reconstruction over a large spatial region and at high frequencies requires numerous microphone measurements. On the other hand, if all geometrical and acoustical aspects of the boundaries are known, the sound field could, in theory, be simulated without any measurements.…

Switchbacks near Boundaries of Small-scale Magnetic Flux Ropes in the Young Solar Wind from Parker Solar Probe Observations
Kyung-Eun Choi, Oleksiy V. Agapitov, Dae-Young Lee, Forrest Mozer, Jia Huang, Lucas Colomban, Jaye L. Verniero, Nour Raouafi
https://arxiv.org/abs/2506.08278

Switchbacks near Boundaries of Small-scale Magnetic Flux Ropes in the Young Solar Wind from Parker Solar Probe Observations
The Parker Solar Probe (PSP) mission has revealed frequent occurrences of switchbacks (SBs) and small-scale magnetic flux ropes (SMFRs) as prominent structures within the solar wind. These mesoscale features are observed across all heliocentric distances, with heightened activity in the young solar wind, such as successive SMFRs, blobs, and SBs using PSP in situ observations. One study, in particular, focuses on SMFRs observed during the intervals of PSP co-rotating with the Sun, which suggests…

Finslerian lightconvex boundaries: applications to causal simplicity and the space of cone geodesics $\mathcal{N}$
J\'onatan Herrera, Miguel S\'anchez
https://arxiv.org/abs/2506.09032

Finslerian lightconvex boundaries: applications to causal simplicity and the space of cone geodesics $\mathcal{N}$
Our outcome is structured in the following sequence: (1) a general result for indefinite Finslerian manifolds with boundary $(M,L)$ showing the equivalence between local and infinitesimal (time, light or space) convexities for the boundary $\partial M$, (2) for any cone structure $(M,\mathcal{C})$ which is globally hyperbolic with timelike boundary, the equivalence among: (a) the boundary $\partial M$ is lightconvex, (b) the interior $\mathring{M}$ is causally simple and (c) the space of the co…

Faceting transition in aluminum as a grain boundary phase transition
Yoonji Choi, Tobias Brink
https://arxiv.org/abs/2506.13550 https://

Faceting transition in aluminum as a grain boundary phase transition
Grain boundaries facet due to anisotropic grain boundary energies: While the faceted boundary has a larger area than the corresponding straight boundary, a significantly lower energy of the facets compared to a straight segment can drive the faceting. This picture is complicated by faceting/defaceting transitions where the free energy difference between the two states depends on the temperature. Here, we use atomistic computer simulations to show how such a transition in a $Σ3$ $[11\overline{1…

Poisson-type problems with transmission conditions at boundaries of infinite metric trees
Maryna Kachanovska, Kiyan Naderi, Konstantin Pankrashkin
https://arxiv.org/abs/2506.11218

Poisson-type problems with transmission conditions at boundaries of infinite metric trees
The paper introduces a Poisson-type problem on a mixed-dimensional structure combining a Euclidean domain and a lower-dimensional self-similar component touching a compact surface (interface). The lower-dimensional piece is a so-called infinite metric tree (one-dimensional branching structure), and the key ingredient of the study is a rigorous definition of the gluing conditions between the two components. These constructions are based on the recent concept of embedded trace maps and some abstr…

This https://arxiv.org/abs/2502.00740 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qfi…

Floating exercise boundaries for American options in time-inhomogeneous models
This paper examines a semi-analytical approach for pricing American options in time-inhomogeneous models characterized by negative interest rates (for equity/FX) or negative convenience yields (for commodities/cryptocurrencies). Under such conditions, exercise boundaries may exhibit a "floating" structure - dynamically appearing and disappearing. For example, a second exercise boundary could emerge within the computational domain and subsequently both could collapse, demanding specialized prici…

It is the fight Trump had been dreaming about,
a showdown with a top political rival in a deep blue state over an issue core to his political agenda.
In bypassing the authority of Gov. Gavin Newsom of California, a Democrat,
to call in the National Guard to quell protests in the Los Angeles area over his administration’s efforts to deport more migrants,
Trump is now pushing the boundaries of presidential authority and stoking criticism that he is inflaming the situation…

Trump Jumps at the Chance for a Confrontation in California Over Immigration
The situation has all the elements that the president seeks: a showdown with a top political rival in a deep blue state over an issue core to his agenda.

Strong "Satan's Boundaries Unchained" incoming... 🤩
#ThrashMetal

"If any of the work, that any of us do, contributes to the stretching of culture, the stretching of boundaries of empathy that’s expected of an audience… that’s the holy grail."
-Riz Ahmed
#acting #coaching

Adaptive Tetrahedral Grids for Volumetric Path-Tracing
Anis Benyoub, Jonathan Dupuy
https://arxiv.org/abs/2506.11510 https://arxiv.or…

Adaptive Tetrahedral Grids for Volumetric Path-Tracing
We advertise the use of tetrahedral grids constructed via the longest edge bisection algorithm for rendering volumetric data with path tracing. The key benefits of such grids is two-fold. First, they provide a highly adaptive space-partitioning representation that limits the memory footprint of volumetric assets. Second, each (tetrahedral) cell has exactly 4 neighbors within the volume (one per face of each tetrahedron) or less at boundaries. We leverage these properties to devise optimized alg…

"While I am responsible for changing what I can, I have to let go of the rest if I want peace of mind. Just for today I will love myself enough to give up a struggle over something that is out of my hands." - Courage to Change (Al-Anon), pg. 129
#serenity #boundaries #mentalhealth

exhibit A / exhibit B
am i delirious or does this PHY just... not comply with the RMII spec??

Very high-order accurate finite volume scheme for the streamfunction-vorticity formulation of incompressible fluid flows with polygonal meshes on arbitrary curved boundaries
Ricardo Costa (Institute for Polymers and Composites, University of Minho, Azur\'em Campus, 4804-058 Guimar\~aes, Portugal, Department of Polymer Engineering, University of Minho, Azur\'em Campus, 4804-058 Guimar\~aes, Portugal), St\'ephane Clain (Centre of Mathematics, University of Coimbra, 3000-143 C…

Very high-order accurate finite volume scheme for the streamfunction-vorticity formulation of incompressible fluid flows with polygonal meshes on arbitrary curved boundaries
Conventional mathematical models for simulating incompressible fluid flow problems are based on the Navier-Stokes equations expressed in terms of pressure and velocity. In this context, pressure-velocity coupling is a key issue, and countless numerical techniques and methods have been developed over the decades to solve these equations efficiently and accurately. In two dimensions, an alternative approach is to rewrite the Navier-Stokes equations regarding two scalar quantities: the streamfunct…

Edge polaritons at metal-insulator boundaries in a phase separated correlated oxide
Weiwei Luo, Adrien Bercher, Claribel Dominguez, Javier del Valle, Jeremie Teyssier, Javier Taboada-Gutierrez, Alexey B. Kuzmenko
https://arxiv.org/abs/2506.03647

Edge polaritons at metal-insulator boundaries in a phase separated correlated oxide
Correlated transition metal oxides, such as cuprates, nickelates, and manganites, are typically considered "bad metals", where high electromagnetic losses suppress the conventional plasmonic effects observed in noble metals, 2D electron gases, and graphene. Nevertheless, using mid-infrared near-field optical nanoscopy, we demonstrate the emergence of strongly confined and long-propagating edge polaritons (EPs) of mixed phonon-plasmon nature at the boundaries between conducting and insulating re…

Edge burst effect and scale-free localization
G. Sen, C. Yuce
https://arxiv.org/abs/2506.08559 https://arxiv.org/pdf/2506.08559

Edge burst effect and scale-free localization
The non-Hermitian edge burst is a phenomenon observed in non-Hermitian quantum dynamics, characterized by a significant accumulation of loss at the boundaries of a system. We present an example of the edge burst effect in a lossy lattice with bipolar non-Hermitian skin effect (NHSE). By introducing a weak coupling between two such non-Hermitian lattices, we demonstrate that the system exhibits bipolar scale-free localization. Through an analysis of local decay distributions and their sensitivit…

This https://arxiv.org/abs/2309.04540 has been replaced.
initial toot: https://mastoxiv.page/@…

Inhomogeneous Quantum Quenches of Conformal Field Theory with Boundaries
We develop a method to calculate generic time-dependent correlation functions for inhomogeneous quantum quenches in (1+1)-dimensional conformal field theory (CFT) induced by sudden Hamiltonian deformations that modulate the energy density inhomogeneously. Our work particularly focuses on the effects of spatial boundaries, which have remained unresolved by previous analytical methods. For generic post-quench Hamiltonian, we develop a generic method to calculate the correlations by mirroring the …

Analogous supercritical crossovers in black holes and water
Shoucheng Wang, Xinyang Li, Yuliang Jin, Li Li
https://arxiv.org/abs/2506.10808 https://…

Analogous supercritical crossovers in black holes and water
We investigate the supercritical crossovers for black hole thermodynamics in the supercritical regime beyond the critical point, where small and large black holes are indistinguishable from the conventional viewpoint. We establish a refined supercritical phase diagram that comprehensively characterizes small, large, and indistinguishable black hole phases, whose boundaries are defined by two supercritical crossover lines. The universal scaling laws of the two crossover lines are fully verified …

This https://arxiv.org/abs/2506.04319 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

The Nonperturbative Hilbert Space of Quantum Gravity With One Boundary
We discuss a basis for the nonperturbative Hilbert space of quantum gravity with one asymptotic boundary. We use this basis to show that the Hilbert space for gravity with two disconnected boundaries factorizes into a product of two copies of the single boundary Hilbert space.

"Twelve years after “As We May Think”, and simultaneous with the developments of the IBM 1401 and FORTRAN, copies of “Datamation” started popping up on selected newsstands. This magazine was the godfather of all programming magazines, and held its crown for 41 years (quite a few ages in computer time!), until being phased out as an online magazine in February 1998."

Distinguishing Orbiting and Infalling Dark Matter Particles with Machine Learning
Ze'ev Vladimir, Calvin Osinga, Benedikt Diemer, Edgar M. Salazar, Eduardo Rozo
https://arxiv.org/abs/2506.09146

Distinguishing Orbiting and Infalling Dark Matter Particles with Machine Learning
Dark matter halos are typically defined as spheres that enclose some overdensity, but these sharp, somewhat arbitrary boundaries introduce non-physical artifacts such as backsplash halos, pseudo-evolution, and an incomplete accounting of halo mass. A more physically motivated alternative is to define halos as the collection of particles that are physically orbiting within their potential well. However, existing methods to classify particles as orbiting or infalling suffer from trade-offs betwee…

Akaike information criterion for segmented regression models
Kazuki Nakajima, Yoshiyuki Ninomiya
https://arxiv.org/abs/2506.08760 https://

Akaike information criterion for segmented regression models
In segmented regression, when the regression function is continuous at the change-points that are the boundaries of the segments, it is also called joinpoint regression, and the analysis package developed by \cite{KimFFM00} has become a standard tool for analyzing trends in longitudinal data in the field of epidemiology. In addition, it is sometimes natural to expect the regression function to be discontinuous at the change-points, and in the field of epidemiology, this model is used in \cite{J…

How to search successfully in Spotlight: GUI tools #Finder

How to search successfully in Spotlight: GUI tools
Using the Spotlight window and Finder’s Find window to locate local files that match your search criteria. Word boundaries and their effect on search results.

This https://arxiv.org/abs/2406.06095 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csMS_…

An extension of C++ with memory-centric specifications for HPC to reduce memory footprints and streamline MPI development
The C++ programming language and its cousins lean towards a memory-inefficient storage of structs: The compiler inserts helper bits such that individual instance variables fit to byte or cache boundaries, while it is not able to exploit knowledge about the range of integers, enums or bitsets. Furthermore, the language provides neither support for data exchange via MPI nor for arbitrary floating-point precisions. We propose C++ attributes through which developers can guide the compiler what memo…

Enumerating planar stuffed maps as hypertrees of mobiles
Nathan Pagliaroli
https://arxiv.org/abs/2506.06086 https://arxiv.org/pdf/250…

Enumerating planar stuffed maps as hypertrees of mobiles
A planar stuffed map is an embedding of a graph into the 2-sphere $S^{2}$, considered up to orientation-preserving homeomorphisms, such that the complement of the graph is a collection of disjoint topologically connected components that are each homeomorphic to $S^{2}$ with multiple boundaries. This is a generalization of planar maps whose complement of the graph is a collection of disjoint topologically connected components that are each homeomorphic to a disc. In this work, we construct a bij…

Crossover in growth law in the vapor-liquid phase separation inside complex porous medium
Preethi M, Bhaskar Sen Gupta
https://arxiv.org/abs/2506.09646 htt…

Crossover in growth law in the vapor-liquid phase separation inside complex porous medium
We employ molecular dynamics simulations to investigate the domain morphology and growth kinetics of a vapor-liquid system embedded within a complex porous medium. By systematically varying the pore structure, we analyze the scaling behavior of correlation functions, structure factors, and domain growth exponents. The structure factor confirms the breakdown of Porod law and the emergence of fractal-like domain boundaries. Our key finding is the clear crossover in the domain growth law, from the…

This https://arxiv.org/abs/2505.23847 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCR_…

Seven Security Challenges That Must be Solved in Cross-domain Multi-agent LLM Systems
Large language models (LLMs) are rapidly evolving into autonomous agents that cooperate across organizational boundaries, enabling joint disaster response, supply-chain optimization, and other tasks that demand decentralized expertise without surrendering data ownership. Yet, cross-domain collaboration shatters the unified trust assumptions behind current alignment and containment techniques. An agent benign in isolation may, when receiving messages from an untrusted peer, leak secrets or viola…

This https://arxiv.org/abs/2201.03074 has been replaced.
link: https://scholar.google.com/scholar?q=a

A Survey of Passive Sensing for Workplace Wellbeing and Productivity
The modern workplace is undergoing a radical transformation, driven by technological advances that blur the boundaries between human capability and digital augmentation. At the forefront of this evolution is passive sensing technology - a suite of tools that quietly monitor and interpret human behavior without active user engagement. This paper examines how these technologies are reshaping our understanding of workplace dynamics, with a particular focus on employee wellbeing and productivity. T…

This https://arxiv.org/abs/2505.17155 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csLG_…

TrimR: Verifier-based Training-Free Thinking Compression for Efficient Test-Time Scaling
Large Reasoning Models (LRMs) demonstrate exceptional capability in tackling complex mathematical, logical, and coding tasks by leveraging extended Chain-of-Thought (CoT) reasoning. Test-time scaling methods, such as prolonging CoT with explicit token-level exploration, can push LRMs' accuracy boundaries, but they incur significant decoding overhead. A key inefficiency source is LRMs often generate redundant thinking CoTs, which demonstrate clear structured overthinking and underthinking patter…

"If any of the work, that any of us do, contributes to the stretching of culture, the stretching of boundaries of empathy that’s expected of an audience… that’s the holy grail."
-Riz Ahmed
#acting #coaching

This https://arxiv.org/abs/2506.03482 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Atomic and Molecular Waveform Processing with Attosecond Resolution
Advancing the temporal resolution in computations, signal generation and modulation, and measurements is of paramount importance for pushing the boundaries of science and technology. Optical resonators have recently demonstrated the ability to perform computational operations at frequencies beyond the gigahertz range, surpassing the speed of conventional electronic devices. However, increasing the resonator length extends the operation time but decreases the temporal resolution, with current st…

Meta-analysis of Life Cycle Assessments for Li-Ion Batteries Production Emissions
Maurizio Clemente, Prapti Maharjan, Mauro Salazar, Theo Hofman
https://arxiv.org/abs/2506.05531

Meta-analysis of Life Cycle Assessments for Li-Ion Batteries Production Emissions
This paper investigates the environmental impact of Li-Ion batteries by quantifying manufacturing-related emissions and analyzing how electricity mix and production scale affect emission intensity. To this end, we conduct a meta-analysis of life cycle assessments on lithium-ion batteries published over the past two decades, categorizing them by year, battery chemistry, functional unit, system boundaries, and electricity mix. We then carry out a cradle-to-gate assessment for a nickel manganese c…

An optimal class of domains permitting inner boundaries in a divergence theorem for rough integrands
Thomas Ruf
https://arxiv.org/abs/2506.09978 https://…

An optimal class of domains permitting inner boundaries in a divergence theorem for rough integrands
The divergence theorem on an open domain $U \subset \mathbb{R}^m$ of finite measure is investigated for the rough class $\mathcal{DM}_\infty(U)$ of bounded vector fields $u \, \colon \, U \to \mathbb{R}^m$ with a finite Radon measure divergence. Let $\mathcal{DB}(U)$ denote the closure of $\mathcal{DM}_\infty(U)$ in the Lebesgue space $L_\infty(U)$. Equivalent conditions are proved for the domain $U$ to admit the divergence theorem \begin{equation} \exists ! \ell \in \mathcal{DB}'(U) \, \colon …

This https://arxiv.org/abs/2012.13515 has been replaced.
link: https://scholar.google.com/scholar?q=a

On Boundaries of $\varepsilon$-neighbourhoods of Planar Sets: Singularities, Global Structure, and Curvature
We study the geometry, topological properties and smoothness of the boundaries of closed $\varepsilon$-neighbourhoods $E_\varepsilon = \{x \in \mathbb{R}^2 \, : \, \textrm{dist}(x, E) \leq \varepsilon \}$ of compact planar sets $E \subset \mathbb{R}^2$. We develop a novel technique for analysing the boundary, and use this to obtain a classification of singularities (i.e.~non-smooth points) on $\partial E_\varepsilon$ into eight categories. We show that the set of singularities is either countab…

This https://arxiv.org/abs/2402.15355 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Boundaries and equivariant maps for ergodic groupoids
We give a notion of boundary pair $(\mathcal{B}_-,\mathcal{B}_+)$ for measured groupoids which generalizes the one introduced by Bader and Furman \cite{BF14} for locally compact groups. In the case of a semidirect groupoid $\mathcal{G}=Γ\ltimes X$ obtained by a probability measure preserving action $Γ\curvearrowright X$ of a locally compact group, we show that a boundary pair is exactly $(B_- \times X, B_+ \times X)$, where $(B_-,B_+)$ is a boundary pair for $Γ$. For any measured groupoid $(…

This https://arxiv.org/abs/2411.04178 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Breaking boundaries: extending the orbit-averaged Fokker-Planck equation inside the loss cone
In this Letter, we present a new formulation of loss cone theory as a reaction-diffusion system, which accounts for loss cone events through a sink term and can be orbit-averaged. It can recover the standard approach based on boundary conditions, and is derived from a simple physical model that overcomes many of the classical theoretical constraints. We test our formulation by computing the relaxed distribution of disruptive orbits in phase space, that has a simple analytic form and matches the…

TumorGen: Boundary-Aware Tumor-Mask Synthesis with Rectified Flow Matching
Shengyuan Liu, Wenting Chen, Boyun Zheng, Wentao Pan, Xiang Li, Yixuan Yuan
https://arxiv.org/abs/2505.24687

TumorGen: Boundary-Aware Tumor-Mask Synthesis with Rectified Flow Matching
Tumor data synthesis offers a promising solution to the shortage of annotated medical datasets. However, current approaches either limit tumor diversity by using predefined masks or employ computationally expensive two-stage processes with multiple denoising steps, causing computational inefficiency. Additionally, these methods typically rely on binary masks that fail to capture the gradual transitions characteristic of tumor boundaries. We present TumorGen, a novel Boundary-Aware Tumor-Mask Sy…

End-to-End Framework for Robot Lawnmower Coverage Path Planning using Cellular Decomposition
Nikunj Shah, Utsav Dey, Kenji Nishimiya
https://arxiv.org/abs/2506.06028

End-to-End Framework for Robot Lawnmower Coverage Path Planning using Cellular Decomposition
Efficient Coverage Path Planning (CPP) is necessary for autonomous robotic lawnmowers to effectively navigate and maintain lawns with diverse and irregular shapes. This paper introduces a comprehensive end-to-end pipeline for CPP, designed to convert user-defined boundaries on an aerial map into optimized coverage paths seamlessly. The pipeline includes user input extraction, coordinate transformation, area decomposition and path generation using our novel AdaptiveDecompositionCPP algorithm, pr…

This https://arxiv.org/abs/2412.09211 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

DeWitt wave functions for de Sitter JT gravity
Jackiw-Teitelboim (JT) gravity in two-dimensional de Sitter space is an intriguing model for cosmological "wave functions of the universe". Its minisuperspace version already contains all physical information. The size of compact slices is parametrized by a scale factor $h > 0$. The dilaton $ϕ$ is chosen to have positive values, $ϕ> 0$, and interpreted as size of an additional compact slice in a higher-dimensional theory. At the boundaries $h=0$, $ϕ=0$, where the volume of the universe vanis…

This https://arxiv.org/abs/2410.16466 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

An Immersed Interface Method for Incompressible Flows and Geometries with Sharp Features
The immersed interface method (IIM) for models of fluid flow and fluid-structure interaction imposes jump conditions that capture stress discontinuities generated by forces that are concentrated along immersed boundaries. Most prior work using the IIM for fluid dynamic applications has focused on smooth interfaces, but boundaries with sharp features such as corners and edges can appear in practical analyses, particularly on engineered structures. The present study builds on our work to integrat…

Confidence intervals for forced alignment boundaries using model ensembles
Matthew C. Kelley
https://arxiv.org/abs/2506.01256 https://

Confidence intervals for forced alignment boundaries using model ensembles
Forced alignment is a common tool to align audio with orthographic and phonetic transcriptions. Most forced alignment tools provide only a single estimate of a boundary. The present project introduces a method of deriving confidence intervals for these boundaries using a neural network ensemble technique. Ten different segment classifier neural networks were previously trained, and the alignment process is repeated with each model. The alignment ensemble is then used to place the boundary at th…

This https://arxiv.org/abs/2404.09319 has been replaced.
initial toot: https://mastoxiv.page/@arXi…

Impact of curved elements for flows over orography with a Discontinuous Galerkin scheme
We present a quantitative assessment of the impact of high-order mappings on the simulation of flows over complex orography. Curved boundaries were not used in early numerical methods, whereas they are employed to an increasing extent in state of the art computational fluid dynamics codes, in combination with high-order methods, such as the Finite Element Method and the Spectral Element Method. Here we consider a specific Discontinuous Galerkin (DG) method implemented in the framework of the de…

Impact of border defects on the magnetic flux penetration in superconducting films
Alejandro V. Silhanek, Lu Jiang, Cun Xue, Beno\^it Vanderheyden
https://arxiv.org/abs/2506.04766

Impact of border defects on the magnetic flux penetration in superconducting films
Defects in superconducting systems are ubiquitous and nearly unavoidable. They can vary in nature, geometry, and size, ranging from microscopic-size defects such as dislocations, grain boundaries, twin planes, and oxygen vacancies, to macroscopic-size defects such as segregations, indentations, contamination, cracks, or voids. Irrespective of their type, defects perturb the otherwise laminar flow of electric current, forcing it to deviate from its path. In the best-case scenario, the associated…

This https://arxiv.org/abs/2506.00891 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCV_…

Uneven Event Modeling for Partially Relevant Video Retrieval
Given a text query, partially relevant video retrieval (PRVR) aims to retrieve untrimmed videos containing relevant moments, wherein event modeling is crucial for partitioning the video into smaller temporal events that partially correspond to the text. Previous methods typically segment videos into a fixed number of equal-length clips, resulting in ambiguous event boundaries. Additionally, they rely on mean pooling to compute event representations, inevitably introducing undesired misalignment…

Reduction of Outflow Boundary Influence on Aerodynamic Performance using Neural Networks
Mario Christopher Bedrunka, Dirk Reith, Holger Foysi, {\L}ukasz {\L}aniewski-Wo{\l}{\l}k, Travis Mitchell
https://arxiv.org/abs/2506.05293

Reduction of Outflow Boundary Influence on Aerodynamic Performance using Neural Networks
The accurate treatment of outflow boundary conditions remains a critical challenge in computational fluid dynamics when predicting aerodynamic forces and/or acoustic emissions. This is particularly evident when employing the lattice Boltzmann method (LBM) as the numerical solution technique, which often suffers from inaccuracies induced by artificial reflections from outflow boundaries. This paper investigates the use of neural networks (NN) to mitigate these adverse boundary effects and enable…

This https://arxiv.org/abs/2501.03542 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Turbulence modeling over riblets via domain transformation
Numerical and experimental studies have demonstrated the drag-reducing potential of carefully designed streamwise-elongated riblets in lowering skin-friction drag. To support the systematic design of such surface corrugations, recent efforts have integrated simplified versions of the governing equations with innovative methods for representing the effects of rough boundaries on flow dynamics. Notably, the statistical response of the eddy-viscosity-enhanced linearized Navier-Stokes equations has…

Asymptotic behavior of complete conformal metric near singular boundary
Weiming Shen, Yue Wang
https://arxiv.org/abs/2506.04591 https://

Asymptotic behavior of complete conformal metric near singular boundary
The boundary behavior of the singular Yamabe problem has been extensively studied near sufficiently smooth boundaries, while less is known about the asymptotic behavior of solutions near singular boundaries. In this paper, we study the asymptotic behaviors of solutions to the singular Yamabe problem with negative constant scalar curvature near singular boundaries and derive the optimal estimates for the background metric which is not necessarily conformally flat. In particular, we prove that th…

Packing3D: An Open-Source Analytical Framework for Computing Packing Density and Mixing Indices Using Partial Spherical Volumes
Freddie Barter, Christopher R. K. Windows-Yule
https://arxiv.org/abs/2506.08852

Packing3D: An Open-Source Analytical Framework for Computing Packing Density and Mixing Indices Using Partial Spherical Volumes
Accurate quantification of local packing density and mixing in simulations of particulate systems is essential for many industrial applications. Traditional methods which simply count the number of particle centres within a given volume of space (cell) introduce discontinuities at cell boundaries, leading to unreliable measurement of packing density. We introduce Packing3D.jl, an open-source Julia package providing analytic, partial-volume calculations for spheres intersecting Cartesian and cyl…

This https://arxiv.org/abs/2501.17600 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_eco…

Towards post-growth policymaking: Barriers and enablers for wellbeing economy and Doughnut economics government initiatives
Providing wellbeing for all while safeguarding planetary boundaries may require governments to pursue post-growth policies. To understand how post-growth policymaking can be fostered, we examine wellbeing economy and Doughnut economics government initiatives across governance scales in Europe, New Zealand, and Canada. To identify political dimensions of barriers and enablers as well as priorities for future action, we apply a framework that distinguishes polity, politics, and policy to analyze …

A mesoscale phase-field model of intergranular liquid lithium corrosion of ferritic/martensitic steels
A. Lhoest, S. Kovacevic, D. Nguyen-Manh, J. Lim, E. Mart\'inez-Pa\~neda, M. Wenman
https://arxiv.org/abs/2506.02776

A mesoscale phase-field model of intergranular liquid lithium corrosion of ferritic/martensitic steels
A phase-field model is developed to simulate intergranular corrosion of ferritic/martensitic steels exposed to liquid lithium. The chromium concentration of the material is used to track the mass transport within the metal and liquid (corrosive) phase. The framework naturally captures intergranular corrosion by enhancing the diffusion of chromium along grain boundaries relative to the grain bulk with no special treatment for the corrosion front evolution. The formulation applies to arbitrary 2D…

Ground states of classical spin polygons: Rigorous results and examples
Wojciech Florek, Heinz-J\"urgen Schmidt, Katarzyna Ja\'sniewicz-Pacer
https://arxiv.org/abs/2506.05838

Ground states of classical spin polygons: Rigorous results and examples
We present a comprehensive and rigorous analysis of the lowest energy configurations (LECs) of classical spin polygons characterized by arbitrary couplings between neighboring spin sites. Our study shows that these ground states exhibit either collinear or coplanar arrangements, which allows us to determine the precise boundaries between these two phases. By simultaneously applying a spin flip and a bond inversion, we simplify the LEC problem and reduce it to a specific scenario with predominan…

Frequency Resource Management in 6G User-Centric CFmMIMO: A Hybrid Reinforcement Learning and Metaheuristic Approach
Selina Cheggour, Valeria Loscri
https://arxiv.org/abs/2505.22443

Frequency Resource Management in 6G User-Centric CFmMIMO: A Hybrid Reinforcement Learning and Metaheuristic Approach
As sixth-generation (6G) networks continue to evolve, AI-driven solutions are playing a crucial role in enabling more efficient and adaptive resource management in wireless communication. One of the key innovations in 6G is user-centric cell-free massive Multiple-Input Multiple-Output (UC-CFmMIMO), a paradigm that eliminates traditional cell boundaries and enhances network performance by dynamically assigning access points (APs) to users. This approach is particularly well-suited for vehicular …

This https://arxiv.org/abs/2505.19998 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Universal scaling of intra-urban climate fluctuations
Urban-induced changes in local microclimate, such as the urban heat island effect and air pollution, are known to vary with city size, leading to distinctive relations between average climate variables and city-scale quantities (e.g., total population or area). However, these approaches suffer from biases related to the choice of city boundaries and they neglect intra-urban variations of urban characteristics. Here we use high-resolution data of urban temperatures, air quality, population count…

From Pixels to Camera: Scaling Superconducting Nanowire Single-Photon Detectors for Imaging at the Quantum-Limit
Jun Gao, Jin Chang, Bruno Lopez Rodriguez, Iman Esmaeil Zadeh, Val Zwiller, Ali W. Elshaari
https://arxiv.org/abs/2505.24725

From Pixels to Camera: Scaling Superconducting Nanowire Single-Photon Detectors for Imaging at the Quantum-Limit
Superconducting nanowire single-photon detectors (SNSPDs) have emerged as essential devices that push the boundaries of photon detection with unprecedented sensitivity, ultrahigh timing precision, and broad spectral response. Recent advancements in materials engineering, superconducting electronics integration, and cryogenic system design are enabling the evolution of SNSPDs from single-pixel detectors toward scalable arrays and large-format single-photon time tagging cameras. This perspective …

Axially symmetric ghost stars
L. Herrera, J. L. Hernandez-Pastora, J. Ospino, A. Di Prisco
https://arxiv.org/abs/2506.05114 https://a…

Axially symmetric ghost stars
We present static axially symmetric fluid distributions not producing gravitational field outside their boundaries (i.e. fluid sources which match smoothly on the boundary surface to Minkowski space-time). These solutions provide further examples of ghost stars. A specific model is fully described, and its physical and geometrical properties are analyzed in detail. This includes the multipole moment structure of the source and its complexity factors, both of which vanish for our solution.

This https://arxiv.org/abs/2107.07544 has been replaced.
link: https://scholar.google.com/scholar?q=a

On Boundaries of $\varepsilon$-neighbourhoods of Planar Sets, Part II: Global Structure and Curvature
We study the global topological structure and smoothness of the boundaries of $\varepsilon$-neighbourhoods $E_\varepsilon = \{x \in \mathbb{R}^2 \, : \, \textrm{dist}(x, E) \leq \varepsilon \}$ of planar sets $E \subset \mathbb{R}^2$. We show that for a compact set $E$ and $\varepsilon > 0$ the boundary $\partial E_\varepsilon$ can be expressed as a disjoint union of an at most countably infinite union of Jordan curves and a possibly uncountable, totally disconnected set of singularities. We al…

Seven Security Challenges That Must be Solved in Cross-domain Multi-agent LLM Systems
Ronny Ko, Jiseong Jeong, Shuyuan Zheng, Chuan Xiao, Taewan Kim, Makoto Onizuka, Wonyong Shin
https://arxiv.org/abs/2505.23847

Seven Security Challenges That Must be Solved in Cross-domain Multi-agent LLM Systems
Large language models (LLMs) are rapidly evolving into autonomous agents that cooperate across organizational boundaries, enabling joint disaster response, supply-chain optimization, and other tasks that demand decentralized expertise without surrendering data ownership. Yet, cross-domain collaboration shatters the unified trust assumptions behind current alignment and containment techniques. An agent benign in isolation may, when receiving messages from an untrusted peer, leak secrets or viola…

We're thrilled to announce that Bloomberg Engineering is once again joining us as a Recording Partner!
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This https://arxiv.org/abs/2410.16466 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

An Immersed Interface Method for Incompressible Flows and Geometries with Sharp Features
The immersed interface method (IIM) for models of fluid flow and fluid-structure interaction imposes jump conditions that capture stress discontinuities generated by forces that are concentrated along immersed boundaries. Most prior work using the IIM for fluid dynamic applications has focused on smooth interfaces, but boundaries with sharp features such as corners and edges can appear in practical analyses, particularly on engineered structures. The present study builds on our work to integrat…

Generalized boundary triples for adjoint pairs with applications to non-self-adjoint Schr\"odinger operators
Antonio Arnal, Jussi Behrndt, Markus Holzmann, Petr Siegl
https://arxiv.org/abs/2505.22321

Generalized boundary triples for adjoint pairs with applications to non-self-adjoint Schrödinger operators
We extend the notion of generalized boundary triples and their Weyl functions from extension theory of symmetric operators to adjoint pairs of operators, and we provide criteria on the boundary parameters to induce closed operators with a nonempty resolvent set. The abstract results are applied to Schrödinger operators with complex $L^p$-potentials on bounded and unbounded Lipschitz domains with compact boundaries.

This https://arxiv.org/abs/2409.03567 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Meshless moment-free quadrature formulas arising from numerical differentiation
We suggest a method for simultaneously generating high order quadrature weights for integrals over Lipschitz domains and their boundaries that requires neither meshing nor moment computation. The weights are determined on pre-defined scattered nodes as a minimum norm solution of a sparse underdetermined linear system arising from a discretization of a suitable boundary value problem by either collocation or meshless finite differences. The method is easy to implement independently of the domain…

Structure functions and flatness of streamwise velocity in a turbulent channel flow
Carlos Granero-Belinchon (ODYSSEY, IMT Atlantique - MEE, Lab-STICC\_OSE), St\'ephane G. Roux (Phys-ENS), Nicolas B. Garnier (Phys-ENS)
https://arxiv.org/abs/2506.05436

Structure functions and flatness of streamwise velocity in a turbulent channel flow
In this article, we present a multiscale characterization of the streamwise velocity of a turbulent channel flow. We study the 2nd and 4th order structure functions and the flatness for scales ranging from the dissipative to the integral domains and for a wide range of distances to the walls spanning four distinct regions of the channel. We characterize the impact of the shear stress induced by the walls on these statistics. Far from the walls, in the outer layer, the impact of the boundaries o…

The transformative capability of quantum-accurate machine learning interatomic potentials
Alfredo A. Correa, Sebastien Hamel
https://arxiv.org/abs/2506.02328

The transformative capability of quantum-accurate machine learning interatomic potentials
Many materials's properties and phase boundaries are generally not well known under extreme pressure and temperature conditions. This is a consequence of the scarcity of experimental information and the difficulty of extrapolating approximations to the atomic interactions in such conditions. Nguyen-Cong and colleagues, in their publication (J.Phys.Chem.Lett. 15, 1152 (2024)), achieved an impressive result using a SNAP (Spectral Neighbor Analysis Potential), an interatomic potential for carbon o…

Done mapping all 10 #barangays of Hadji Muhtamad, Basilan, #Philippines 🇵🇭 in #OpenStreetMap, creating their #Wikidata

This https://arxiv.org/abs/2411.15983 has been replaced.
initial toot: https://mastoxiv.page/@a…

Why Grain Growth is Not Curvature Flow
Grain growth in polycrystals is traditionally considered a capillarity-driven process, where grain boundaries (GBs) migrate toward their centers of curvature (i.e., mean curvature flow) with a velocity proportional to the local curvature (including extensions to account for anisotropic GB energy and mobility). Experimental and simulation evidence shows that this simplistic view is untrue. We demonstrate that the failure of the classical mean curvature flow description of grain growth mainly ori…

Robust Charge-Density Wave Correlations in Optimally-Doped YBa2Cu3Oy
Rui Zhou, Igor Vinograd, Hadrien Mayffre, Juan Porras, Hun-Ho Kim, Toshinao Loew, Yiran Liu, Matthieu Le Tacon, Bernhard Keimer, Marc-Henri Julien
https://arxiv.org/abs/2506.00617

Robust Charge-Density Wave Correlations in Optimally-Doped YBa2Cu3Oy
Charge-density wave (CDW) order is a key property of high-Tc cuprates, but its boundaries in the phase diagram and potential connections to other phases remain controversial. We report nuclear magnetic resonance (NMR) measurements in the prototypical cuprate YBa2Cu3Oy demonstrating that short-range static CDW order remains robust at optimal doping (p=0.165), exhibiting a strength and temperature dependence in the normal state similar to those observed at p=0.11 in the underdoped regime. For an …

This https://arxiv.org/abs/2410.05132 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On the uniqueness of tangent cones to area minimizing currents at boundaries with arbitrary multiplicity
We consider an area minimizing current $T$ in a $C^2$ submanifold $Σ$ of $\mathbb{R}^{m+n}$, with arbitrary integer boundary multiplicity $\partial T = Q [\![ Γ]\!]$ where $Γ$ is a $C^2$ submanifold of $Σ$. We show that at every density $Q/2$ boundary point the tangent cone to $T$ is unique and there is a power rate of convergence to the unique tangent cone. In particular, if $Γ$ is a closed manifold which lies at the boundary of a uniformly convex set $Ω$ and $Σ=\mathbb{R}^{m+n}$ then…

Classical spin liquids from frustrated Ising models in hyperbolic space
Fabian K\"ohler, Johanna Erdmenger, Roderich Moessner, Matthias Vojta
https://arxiv.org/abs/2506.02113

Classical spin liquids from frustrated Ising models in hyperbolic space
Antiferromagnetic Ising models on frustrated lattices can realize classical spin liquids, with highly degenerate ground states and, possibly, fractionalized excitations and emergent gauge fields. Motivated by the recent interest in many-body system in negatively curved space, we study hyperbolic frustrated Ising models. Specifically, we consider nearest-neighbor Ising models on tesselations with odd-length loops in two-dimensional hyperbolic space. For finite systems with open boundaries we det…

AgentAlign: Navigating Safety Alignment in the Shift from Informative to Agentic Large Language Models
Jinchuan Zhang, Lu Yin, Yan Zhou, Songlin Hu
https://arxiv.org/abs/2505.23020

AgentAlign: Navigating Safety Alignment in the Shift from Informative to Agentic Large Language Models
The acquisition of agentic capabilities has transformed LLMs from "knowledge providers" to "action executors", a trend that while expanding LLMs' capability boundaries, significantly increases their susceptibility to malicious use. Previous work has shown that current LLM-based agents execute numerous malicious tasks even without being attacked, indicating a deficiency in agentic use safety alignment during the post-training phase. To address this gap, we propose AgentAlign, a novel framework t…

Fluid Simulation on Vortex Particle Flow Maps
Sinan Wang, Junwei Zhou, Fan Feng, Zhiqi Li, Yuchen Sun, Duowen Chen, Greg Turk, Bo Zhu
https://arxiv.org/abs/2505.21946

Fluid Simulation on Vortex Particle Flow Maps
We propose the Vortex Particle Flow Map (VPFM) method to simulate incompressible flow with complex vortical evolution in the presence of dynamic solid boundaries. The core insight of our approach is that vorticity is an ideal quantity for evolution on particle flow maps, enabling significantly longer flow map distances compared to other fluid quantities like velocity or impulse. To achieve this goal, we developed a hybrid Eulerian-Lagrangian representation that evolves vorticity and flow map qu…

Displacement of three-phase flow for Heavy Oil: Riemann Solutions
Luis Fernando Lozano, Furtado Frederico, De Souza Aparecido, Marchesin Dan
https://arxiv.org/abs/2506.09077

Displacement of three-phase flow for Heavy Oil: Riemann Solutions
This work presents the Riemann solution for three-phase flow in porous media under the condition that oil viscosity exceeds that of water and gas. We classify all Riemann solution problems for scenarios where the left states $L$ lie along the edge $G$-$W$, and the right states $R$ span nearly the entire saturation triangle, excluding small regions near the boundaries $G$-$O$ and $W$-$O$. We use the wave curve method to determine the Riemann solution for initial and injection data within the abo…

Accuracy and scalability of asynchronous compressible flow solver for transitional flows
Aswin Kumar Arumugam, Shubham Kumar Goswami, Nagabhushana Rao Vadlamani, Konduri Aditya
https://arxiv.org/abs/2506.03027

Accuracy and scalability of asynchronous compressible flow solver for transitional flows
To overcome the communication bottlenecks observed in state-of-the-art parallel time-dependent flow solvers at extreme scales, an asynchronous computing approach that relaxes communication and synchronization at a mathematical level was previously developed. This approach preserves high-order accuracy of computations near processing element boundaries using asynchrony-tolerant (AT) schemes while significantly improving the scalability. The numerical properties of the AT schemes were studied bas…

Superconducting diode effect in a meso-wedge geometry with Abrikosov vortices
C. A. Aguirre, J. Barba-Ortega, A. S. de Arruda, J. Faundez
https://arxiv.org/abs/2506.01797

Superconducting diode effect in a meso-wedge geometry with Abrikosov vortices
In this study, we explore the behavior of a superconducting meso-wedge geometry in 3+1 dimensions (three spatial dimensions plus time) subjected to external transport currents at its boundaries and surfaces, as well as external fields applied along the $\hat{z}$-direction. The transport currents are included as two opposite polarities, $\textbf{J}>0$ and $\textbf{J}<0$. Using the generalized time-dependent Ginzburg-Landau theory and considering the order parameter $κ$, we focus on two scenario…

New insights into the cavitation erosion by bubble collapse at moderate stand-off distances
Zhesheng Zhao, Shuai Li, Chengwang Xiong, Pu Cui, Shiping Wang, A-Man Zhang
https://arxiv.org/abs/2506.01286

New insights into the cavitation erosion by bubble collapse at moderate stand-off distances
Non-spherical bubble collapses near solid boundaries, generating water hammer pressures and shock waves, were recognized as key mechanisms for cavitation erosion. However, there is no agreement on local erosion patterns, and cavitation erosion damage lacks quantitative analysis. In our experiments, five distinct local erosion patterns were identified on aluminum sample surfaces, resulting from the collapse of laser-induced cavitation bubbles at moderate stand-off distances of $0.4\leγ\le2.2$, …

Machine-learning-driven modelling of amorphous and polycrystalline BaZrS$_{3}$
Laura-Bianca Pa\c{s}ca, Yuanbin Liu, Andy S. Anker, Ludmilla Steier, Volker L. Deringer
https://arxiv.org/abs/2506.01517

Machine-learning-driven modelling of amorphous and polycrystalline BaZrS$_{3}$
The chalcogenide perovskite material BaZrS$_{3}$ is of growing interest for emerging thin-film photovoltaics. Here we show how machine-learning-driven modelling can be used to describe the material's amorphous precursor as well as polycrystalline structures with complex grain boundaries. Using a bespoke machine-learned interatomic potential (MLIP) model for BaZrS$_{3}$, we study the atomic-scale structure of the amorphous phase, quantify grain-boundary formation energies, and create realistic-s…

This https://arxiv.org/abs/2412.03477 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Analysis of the multi-dimensional semi-discrete Active Flux method using the Fourier transform
The degrees of freedom of Active Flux are cell averages and point values along the cell boundaries. These latter are shared between neighbouring cells, which gives rise to a globally continuous reconstruction. The semi-discrete Active Flux method uses its degrees of freedom to obtain Finite Difference approxi\-mations to the spatial derivatives which are used in the point value update. The averages are updated using a quadrature of the flux and making use of the point values as quadrature point…

Quantum multicriticality and emergent symmetry in Dirac systems with two order parameters at three-loop order
Max Uetrecht, Igor F. Herbut, Michael M. Scherer, Emmanuel Stamou, Tom Steudtner
https://arxiv.org/abs/2505.22723

Quantum multicriticality and emergent symmetry in Dirac systems with two order parameters at three-loop order
Two-dimensional materials with interacting Dirac excitations can host quantum multicritical behavior near the phase boundaries of the semimetallic and two-ordered phases. We study such behavior in Gross--Neveu--Yukawa field theories where $N_f$ flavors of Dirac fermions are coupled to two order-parameter fields with $SO(N_A)$ and $SO(N_B)$ symmetry, respectively. To that end, we employ the perturbative renormalization group up to three-loop order in $4-ε$ spacetime dimensions. We distinguish t…

Elementary discrete diffusion/redistancing schemes for the mean curvature flow
Antonin Chambolle, Daniele De Gennaro, Massimiliano Morini
https://arxiv.org/abs/2506.05946

Elementary discrete diffusion/redistancing schemes for the mean curvature flow
We consider here a fully discrete and explicit scheme for the mean curvature flow of boundaries, based on an elementary diffusion step and a precise redistancing operation. We give an elementary convergence proof for the scheme under the standard CFL condition $h\sim\varepsilon^2$, where $h$ is the time discretization step and $\varepsilon$ the space step. We discuss extensions to more general convolution/redistancing schemes.

Anomalous magnetic response in the Au-Al-Gd 1/1 quasicrystal approximant
Takafumi D. Yamamoto, Tasuku Watanae, Farid Labib, Asuka Ishikawa, Shintaro Suzuki, Ryuji Tamura
https://arxiv.org/abs/2506.00778

Anomalous magnetic response in the Au-Al-Gd 1/1 quasicrystal approximant
The magnetic response of the Tsai-type 1/1 Au-Al-Gd approximant crystals (ACs) was quantitatively investigated in terms of the magnetic entropy change ($ΔS_{M}$) for different magnetic ground states. A comprehensive $ΔS_{M}$ map over a wide electron concentration range has been established, demonstrating the detailed variation of $ΔS_{M}$ across the entire magnetic phase diagram in the Tsai-type 1/1 ACs. Near the boundaries of the ferromagnetic (FM) phase, a clear deviation from the mean-fie…

This https://arxiv.org/abs/2505.22737 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Nonlinear Diffusion and Decay of an Expanding Turbulent Blob
Turbulence, left unforced, decays and invades the surrounding quiescent fluid. Though ubiquitous, this simple phenomenon has proven hard to capture within a simple and general framework. Experiments in conventional turbulent flow chambers are inevitably complicated by proximity to boundaries and mean flow, obscuring the fundamental aspects of the relaxation to the quiescent fluid state. Here, we circumvent these issues by creating a spatially-localized blob of turbulent fluid using eight conver…

Line and Planar Defects with Zero Formation Free Energy: Applications of the Phase Rule toward Ripening-Immune Microstructures
Ju Li, Yuri Mishin
https://arxiv.org/abs/2505.24092 …

Line and Planar Defects with Zero Formation Free Energy: Applications of the Phase Rule toward Ripening-Immune Microstructures
Extended one- and two-dimensional defects in crystalline materials are usually metastable. The thermodynamic ground state of the material is presumed to be defect-free. Here, we investigate the conditions under which extended defects, such as grain boundaries, can exist in a multicomponent alloy when the latter reaches the thermodynamic ground state allowed by the Gibbs phase rule. We treat all extended defects as low-dimensional phases on the same footing as the conventional bulk phases. Therm…

This https://arxiv.org/abs/2506.01607 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

The free boundary for a superlinear system
In this paper, we study superlinear systems that give rise to free boundaries. Such systems appear for example from the minimization of the energy functional $$ \int_Ω\left(|\nabla\mathbf{u}|^2+\frac2p|\mathbf{u}|^p\right),\quad 0

Nonlinear Diffusion and Decay of an Expanding Turbulent Blob
Takumi Matsuzawa, Minhui Zhu, Nigel Goldenfeld, William T. M. Irvine
https://arxiv.org/abs/2505.22737

Nonlinear Diffusion and Decay of an Expanding Turbulent Blob
Turbulence, left unforced, decays and invades the surrounding quiescent fluid. Though ubiquitous, this simple phenomenon has proven hard to capture within a simple and general framework. Experiments in conventional turbulent flow chambers are inevitably complicated by proximity to boundaries and mean flow, obscuring the fundamental aspects of the relaxation to the quiescent fluid state. Here, we circumvent these issues by creating a spatially-localized blob of turbulent fluid using eight conver…

The free boundary for a superlinear system
Daniela De Silva, Seongmin Jeon, Henrik Shahgholian
https://arxiv.org/abs/2506.01607 https://

The free boundary for a superlinear system
In this paper, we study superlinear systems that give rise to free boundaries. Such systems appear for example from the minimization of the energy functional $$ \int_Ω\left(|\nabla\mathbf{u}|^2+\frac2p|\mathbf{u}|^p\right),\quad 0

The vector-valued Allen-Cahn equation with potentials of high-dimensional double-wells under Robin boundary conditions
Xingyu Wang
https://arxiv.org/abs/2506.00392

The vector-valued Allen-Cahn equation with potentials of high-dimensional double-wells under Robin boundary conditions
This work investigates the vector-valued Allen-Cahn equation with potentials of high-dimensional double-wells under Robin boundary conditions. We establish local-in-time convergence of solutions to mean curvature flow with a fixed contact angle $0<α\leq 90^\circ$, for a broad class of boundary energy densities and well-prepared initial data. The limiting sharp-interface system is derived, comprising harmonic heat flows in the bulk and minimal pair conditions at phase boundaries. The analysis c…