Tootfinder

Solar Cycle Variations in Meridional Flows and Rotational Shear within the Sun's Near-surface Shear Layer: #solar rotation: https://www.nature.com/articles/d44151-025-00101-6 - scientists uncover how deep plasma flows reshape the Sun’s rotation and hint at mysteries below its surface.

Demonstration of an integral method for estimating wall shear stress in complex high-speed flows
Mateus A. R. Braga, Robyn L. Macdonald
https://arxiv.org/abs/2508.15024 https://…

Demonstration of an integral method for estimating wall shear stress in complex high-speed flows
Turbulent flows over blunt bodies with distributed roughness present a class of problems relevant to hypersonic atmospheric entry systems. However, accurate predictions of shear stress on such bodies remains elusive. This work presents a simple integral formulation to infer wall shear stress based on the Favre-averaged streamwise momentum equation, integrated once in the wall-normal direction. The proposed integral formulation eliminates streamwise dependence, relying only on data and gradients…

eX-NIDS: A Framework for Explainable Network Intrusion Detection Leveraging Large Language Models
Paul R. B. Houssel, Siamak Layeghy, Priyanka Singh, Marius Portmann
https://arxiv.org/abs/2507.16241

eX-NIDS: A Framework for Explainable Network Intrusion Detection Leveraging Large Language Models
This paper introduces eX-NIDS, a framework designed to enhance interpretability in flow-based Network Intrusion Detection Systems (NIDS) by leveraging Large Language Models (LLMs). In our proposed framework, flows labelled as malicious by NIDS are initially processed through a module called the Prompt Augmenter. This module extracts contextual information and Cyber Threat Intelligence (CTI)-related knowledge from these flows. This enriched, context-specific data is then integrated with an input…

Coriolis force acting on near-surface horizontal flows during simulations of flux emergence produces a tilt angle consistent with Joy's law on the Sun
William Roland-Batty, Hannah Schunker, Robert H. Cameron, Damien Przybylski, Laurent Gizon, David I. Pontin
https://arxiv.org/abs/2506.15935

Coriolis force acting on near-surface horizontal flows during simulations of flux emergence produces a tilt angle consistent with Joy's law on the Sun
Joy's law describes the tilt of bipolar active regions on the Sun away from an east-west orientation, where the flux of the polarity concentrated at the prograde side tends to be closer to the equator than the polarity on the retrograde side. Joy's law is attributed to the Coriolis force because of the observed increase in tilt angle at higher latitudes. This tilt plays a crucial role in some solar dynamo models. Our goal is to model the effects of the Coriolis force on a flux tube as it rises …

Simulating Correlated Electrons with Symmetry-Enforced Normalizing Flows
Dominic Schuh, Janik Kreit, Evan Berkowitz, Lena Funcke, Thomas Luu, Kim A. Nicoli, Marcel Rodekamp
https://arxiv.org/abs/2506.17015

Simulating Correlated Electrons with Symmetry-Enforced Normalizing Flows
We present the first proof of principle that normalizing flows can accurately learn the Boltzmann distribution of the fermionic Hubbard model - a key framework for describing the electronic structure of graphene and related materials. State-of-the-art methods like Hybrid Monte Carlo often suffer from ergodicity issues near the time-continuum limit, leading to biased estimates. Leveraging symmetry-aware architectures as well as independent and identically distributed sampling, our approach resol…

Obstacle-tuned transition from chaotic to coherent vortex flows and odd diffusion in chiral active fluids
Joscha Mecke, Yongxiang Gao, Marisol Ripoll
https://arxiv.org/abs/2508.15210

Obstacle-tuned transition from chaotic to coherent vortex flows and odd diffusion in chiral active fluids
The interaction of a suspension of rotating colloids with a periodically patterned structure is here investigated by means of continuum theoretical predictions and hydrodynamic simulations. Close to the obstacle surface, rotors circulate opposite to their inherent direction of rotation as a result of unidirectional rotational stresses, which is in agreement with a prediction of the generalised Stokes equation. The resulting stationary background flow significantly affects the system dynamics an…

Mathematical modeling and simulation of two-phase magnetohydrodynamic flows at low magnetic Reynolds numbers
Jiancheng Wang, Maojun Li, Zeyu Xia, Liwei Xu
https://arxiv.org/abs/2507.14518

Mathematical modeling and simulation of two-phase magnetohydrodynamic flows at low magnetic Reynolds numbers
We propose a novel mathematical framework for simulating the two-phase incompressible magnetohydrodynamic (MHD) problems. Focusing on low magnetic Reynolds number regimes, where induced magnetic fields are negligible compared to applied fields, an intrinsic sharp-interface system is first formulated. Subsequently, we utilize the phase-field approach to characterize the interface and derive a thermodynamically consistent phase-field model through the Onsager's variational principle. The resultin…

Dynamics of Enveloping Semigroup of Flows
Sushmita Yadav, Puneet Sharma
https://arxiv.org/abs/2507.16232 https://arxiv.org/pdf/2507.1…

Dynamics of Enveloping Semigroup of Flows
In this article, we relate the dynamics of a flow $(X, T)$ with the dynamics of the induced flow $(E(X), T)$ where $E(X)$ is the enveloping semigroup of flow $(X, T)$. We establish that a flow $(X, T)$ is distal if and only if the induced flow is also distal. We prove that while the induced flow on the enveloping semigroup of an equicontinuous flow is equicontinuous, the converse holds when $(X, T)$ is point transitive. We prove that for any flow $(X,T)$, $(E(X),T)$ is isomorphic to $(E(E(X)),T…

Hidden (absorbed) Cooling Flows V: Groups and Galaxies including Spirals
A. C. Fabian, J. S. Sanders, G. J. Ferland, H. R. Russell, B. R. McNamara, C. Pinto, S. A. Walker
https://arxiv.org/abs/2508.14785

Hidden (absorbed) Cooling Flows V: Groups and Galaxies including Spirals
Cooling flows are observed in X-ray studies of the centres of cool core clusters, galaxy groups and individual elliptical galaxies. They are partly hidden from direct view by embedded cold gas so have been called Hidden Cooling Flows. X-ray spectra from the XMM RGS reveal emission from hot gas modified by photoelectric absorption by cold gas intrinsic to the flow. Here we present the spectral analysis of 6 more low redshift galaxy groups ranging from the nearest fossil group to 2 groups hosting…

Discontinuous shear-thickening asymptotic for power-law systems related to compressible flows
Didier Bresch (LAMA), Cosmin Burtea, Maja Szlenk
https://arxiv.org/abs/2507.15410

Discontinuous shear-thickening asymptotic for power-law systems related to compressible flows
In this paper we study the convergence of a power-law model for dilatant compressible fluids to a class of models exhibiting a maximum admissible shear rate, called thick compressible fluids. These kinds of problems were studied previously for elliptic equations, stating with the work of Bhattacharya, E. DiBenedetto and J. Manfredi [Rend. Sem. Mat. Univ. Politec. Torino 1989], and more recently for incompressible fluids by J.F. Rodrigues [J. Math. Sciences 2015]. Our result may be seen as an ex…

#Kotlin Flows Explained
https://itnext.io/kotlin-flows-explained-232bec811f7f

Adaptive Transition State Refinement with Learned Equilibrium Flows
Samir Darouich, Vinh Tong, Tanja Bien, Johannes K\"astner, Mathias Niepert
https://arxiv.org/abs/2507.16521

Adaptive Transition State Refinement with Learned Equilibrium Flows
Identifying transition states (TSs), the high-energy configurations that molecules pass through during chemical reactions, is essential for understanding and designing chemical processes. However, accurately and efficiently identifying these states remains one of the most challenging problems in computational chemistry. In this work, we introduce a new generative AI approach that improves the quality of initial guesses for TS structures. Our method can be combined with a variety of existing tec…

Analytic Full Potential Adjoint Solution for Two-dimensional Subcritical Flows
Carlos Lozano, Jorge Ponsin
https://arxiv.org/abs/2506.16886 https://…

Analytic Full Potential Adjoint Solution for Two-dimensional Subcritical Flows
We investigate the analytic adjoint solution of the two-dimensional (2D) full potential equation for subcritical flows for a cost function measuring aerodynamic force by the Green's function approach and by the connection of the adjoint full potential and compressible Euler equations. The solution for aerodynamic lift is written in terms of two unknown functions encoding the effect of perturbations to the Kutta condition. We analyze the properties of these functions from an analytic viewpoint a…

Lense-Thirring precession of accretion flows: relativistic versus classical precession
Gabriel T\"or\"ok, Martin Urbanec, Monika Matuszkov\'a, Gabriela Urbancov\'a, Kate\v{r}ina Klimovi\v{c}ov\'a, Debora Lan\v{c}ov\'a, Eva \v{S}r\'amkov\'a, Ji\v{r}\'i Hor\'ak
https://arxiv.org/abs/2508.13777…

Lense-Thirring precession of accretion flows: relativistic versus classical precession
The vertical (Lense-Thirring) precession of the innermost accretion flows has been discussed as a sensitive indicator of the rotational properties of neutron stars (NSs) and their equation of state because it vanishes for a non-rotating star. In this work, we apply the Hartle-Thorne spacetimes to study the frequencies of the precession for both geodesic and non-geodesic (fluid) flows. We build on previous findings on the effect of the NS quadrupole moment, which revealed the importance of the i…

Latent Noise Injection for Private and Statistically Aligned Synthetic Data Generation
Rex Shen, Lu Tian
https://arxiv.org/abs/2506.16636 https://

Latent Noise Injection for Private and Statistically Aligned Synthetic Data Generation
Synthetic Data Generation has become essential for scalable, privacy-preserving statistical analysis. While standard approaches based on generative models, such as Normalizing Flows, have been widely used, they often suffer from slow convergence in high-dimensional settings, frequently converging more slowly than the canonical $1/\sqrt{n}$ rate when approximating the true data distribution. To overcome these limitations, we propose a Latent Noise Injection method using Masked Autoregressive F…

Expansive Natural Neural Gradient Flows for Energy Minimization
Wolfgang Dahmen, Wuchen Li, Yuankai Teng, Zhu Wang
https://arxiv.org/abs/2507.13475 https:/…

Expansive Natural Neural Gradient Flows for Energy Minimization
This paper develops expansive gradient dynamics in deep neural network-induced mapping spaces. Specifically, we generate tools and concepts for minimizing a class of energy functionals in an abstract Hilbert space setting covering a wide scope of applications such as PDEs-based inverse problems and supervised learning. The approach hinges on a Hilbert space metric in the full diffeomorphism mapping space, which could be viewed as a generalized Wasserstein-2 metric. We then study a projection gr…

Found the cracked Brady inkjet print head in the trash and realized what I was missing: the polyimide isn't covering a silicon membrane, as far as I can tell. It *is* the membrane.
I think the way this works is, ink wicks out of the storage sponge and down the DRIE'd trench by capillary action.
The bottom of the trench isn't open, it's completely covered by the polyimide membrane. Instead, the ink then flows *sideways* by capillary action into the individual nozzl…

Flows on Gentle Algebras
Jonah Berggren
https://arxiv.org/abs/2507.12688 https://arxiv.org/pdf/2507.12688

Flows on Gentle Algebras
The space of unit flows on a directed acyclic graph (DAG) is known to admit regular unimodular triangulations induced by framings of the DAG. Amply framed DAGs and their triangulated flow polytopes have recently been connected with the representation theory of certain gentle algebras. We expand on this connection by defining a flow on the fringed quiver of an arbitrary gentle algebra. We call the space of unit flows its turbulence polyhedron. We show that support tau-tilting modules of a gentle…

Is memory all you need? Data-driven Mori-Zwanzig modeling of Lagrangian particle dynamics in turbulent flows
Xander de Wit, Alessandro Gabbana, Michael Woodward, Yen Ting Lin, Federico Toschi, Daniel Livescu
https://arxiv.org/abs/2507.16058

Is memory all you need? Data-driven Mori-Zwanzig modeling of Lagrangian particle dynamics in turbulent flows
The dynamics of Lagrangian particles in turbulence play a crucial role in mixing, transport, and dispersion processes in complex flows. Their trajectories exhibit highly non-trivial statistical behavior, motivating the development of surrogate models that can reproduce these trajectories without incurring the high computational cost of direct numerical simulations of the full Eulerian field. This task is particularly challenging because reduced-order models typically lack access to the full set…

Minimal Per-Flow Backlog Bounds at an Aggregate FIFO Server under Piecewise-Linear Arrival Curves
Lukas Wildberger, Anja Hamscher, Jens B. Schmitt
https://arxiv.org/abs/2506.16914

Minimal Per-Flow Backlog Bounds at an Aggregate FIFO Server under Piecewise-Linear Arrival Curves
Network Calculus (NC) is a versatile methodology based on min-plus algebra to derive worst-case per-flow performance bounds in networked systems with many concurrent flows. In particular, NC can analyze many scheduling disciplines; yet, somewhat surprisingly, an aggregate FIFO server is a notoriously hard case due to its min-plus non-linearity. A resort is to represent the FIFO residual service by a family of functions with a free parameter instead of just a single curve. For simple token-bucke…

The Order-disorder Transition in Incompressible Polar Active Fluids with an Easy Axis
Leiming Chen, Chiu Fan Lee, John Toner
https://arxiv.org/abs/2507.15159

The Order-disorder Transition in Incompressible Polar Active Fluids with an Easy Axis
Dry active matter in an anisotropic medium is of experimental relevance, and the interplay between anisotropy and the dynamics of the active matter remains under-explored. Here, we derive the hydrodynamic equations of a generic dry polar active fluid that preferentially flows along a particular axis induced by the anisotropy of the medium. We then study its critical behavior at the order-disorder transition in which the symmetry between ``forward" and ``back" along the special axis is spontaneo…

Electromagnetic Flow Control in Hypersonic Rarefied Environment
Zhigang Pu, Kun Xu
https://arxiv.org/abs/2507.14628 https://arxiv.org…

Electromagnetic Flow Control in Hypersonic Rarefied Environment
The Unified Gas-Kinetic Wave-Particle (UGKWP) method, developed for multiscale simulation of partially ionized plasmas, has been extended to unstructured meshes, enabling the modeling of electromagnetic flows around a hemisphere across near-continuum to rarefied regimes. To the best of our knowledge, this work represents the first application of a multiscale plasma solver to this problem. In our approach, neutrals, ions, and electrons are treated as distinct species, with electrons modeled beyo…

Physics-informed operator flows and observables
Friederike Ihssen, Jan M. Pawlowski
https://arxiv.org/abs/2507.13011 https://arxiv.or…

Physics-informed operator flows and observables
We discuss physics-informed renormalisation group flows (PIRGs) for general operators. We show that operator PIRGs provide a comprehensive access to all correlation functions of the quantum field theory under investigation. The operator PIRGs can be seen as a completion of the PIRG-approach, whose qualitative computational simplification and structural insights are now fully accessible for general applications. The potential of this setup is assessed within a simple analytic example of the zero…

Inverse curvature flows for capillary hypersurfaces in the unit ball
Shujing Pan, Bo Yang
https://arxiv.org/abs/2507.12097 https://ar…

Inverse curvature flows for capillary hypersurfaces in the unit ball
In this paper, we study inverse curvature flows for strictly convex, capillary hypersurfaces in the unit Euclidean ball. We establish the existence and convergence results for a class of such flows. As an application, we derive a family of Alexandrov Fenchel inequalities for weakly convex hypersurfaces with free boundary.

A general framework for the asymptotic analysis of moist atmospheric flows
Daniel B\"aumer, Rupert Klein, Norbert J. Mauser
https://arxiv.org/abs/2506.14450

A general framework for the asymptotic analysis of moist atmospheric flows
We deal with asymptotic analysis for the derivation of partial differential equation models for geophysical flows in the earth's atmosphere with moist process closures, and we study their mathematical properties. Starting with the Navier-Stokes equations for dry air, we put the seminal papers of Klein, Majda et al. in a unified context and then discuss the appropriate extension to moist air. In particular, we deal with the scale-independent distinguished limit for the universal parameters of at…

Cross-Border Data Flows in Africa: Examining Policy Approaches and Pathways to Regulatory Interoperability
https://fpf.org/blog/cross-border-data-flows-in-africa-examining-policy-approaches-and-pathways-to-regulat…

Observational Analysis of Multi-thermal Counter-streaming Flows in a Forming Filament and Their Relationship with Local Heating at Filament Footpoints
Hongrui Li, Hechao Chen, Chun Xia, Xiaoli Yan, Yongyuan Xiang, Jincheng Wang
https://arxiv.org/abs/2508.12737

Observational Analysis of Multi-thermal Counter-streaming Flows in a Forming Filament and Their Relationship with Local Heating at Filament Footpoints
Utilizing high-resolution imaging and spectroscopic observations from the New Vacuum Solar Telescope (NVST), the Interface Region Imaging Spectrograph (IRIS), and the Solar Dynamics Observatory (SDO), we investigated the nature and origin of counter-streaming flows within a forming active region filament. The ever-present counter-streaming flows observed within the filament are identified as interleaved unidirectional mass flows in opposing directions occurring in neighboring threads. Multi-wav…

The latest #homeassistant has #sankey diagrams for energy flow. I obviously need more energy tracking #sensors for the house ;-)

Transfer entropy for finite data
Alec Kirkley
https://arxiv.org/abs/2506.16215 https://arxiv.org/pdf/2506.16215

Transfer entropy for finite data
Transfer entropy is a widely used measure for quantifying directed information flows in complex systems. While the challenges of estimating transfer entropy for continuous data are well known, it has two major shortcomings that persist even for data of finite cardinality: it exhibits a substantial positive bias for sparse bin counts, and it has no clear means to assess statistical significance. By more precisely accounting for information content in finite data streams, we derive a transfer ent…

🇺🇦 #NowPlaying on #BBC6Music's #BLOCKPARTYWithHueyMorgan
Hector Plimmer:
🎵 Water Flows
#HectorPlimmer
https://hector-plimmer.bandcamp.com/track/water-flows
https://open.spotify.com/track/5eclF4fCD8ZPr0ek179K0D

Rigorous dense graph limit of a model for biological transportation networks
Nuno J. Alves, Jan Haskovec
https://arxiv.org/abs/2507.15829 https://

Rigorous dense graph limit of a model for biological transportation networks
We rigorously derive the dense graph limit of a discrete model describing the formation of biological transportation networks. The discrete model, defined on undirected graphs with pressure-driven flows, incorporates a convex energy functional combining pumping and metabolic costs. It is constrained by a Kirchhoff law reflecting the local mass conservation. We first rescale and reformulate the discrete energy functional as an integral `semi-discrete' functional, where the Kirchhoff law transfor…

New study: 60% of the world’s land area is in a precarious state, putting at risk the ability of the plant world to acquire enough energy through photosynthesis to maintain the material flows of carbon, water and nitrogen that support the ecosystems.
https://www.

60 percent of the world’s land area is in a precarious state
15.08.2025 – A new study maps the planetary boundary of “functional biosphere integrity” in spatial detail and over centuries. It finds that 60 percent of global land areas are now already outside the locally defined safe zone, and 38 percent are even in the high-risk zone. The study was led by the Potsdam Institute for Climate Impact Research (PIK) together with BOKU University in Vienna and published in the renowned journal One Earth.

Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows
Hong-Xuan Jiang, Yosuke Mizuno, Dong Lai, Indu K. Dihingia, Christian M. Fromm
https://arxiv.org/abs/2507.13680

Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows
Observations of accreting black hole (BH) systems, such as microquasars and supermassive black holes, often reveal a precessing jet with changing directions, indicating a misaligned accretion flow relative to the BH spin. The precession is commonly attributed to the Lense-Thirring (LT) effect, which arises from the BH's rotation twisting the surrounding spacetime and accretion flow. In the strongly magnetized regime, which is preferred accretion flow conditions for M~87$^*$ and likely other jet…

A Finite Volume and Levenberg-Marquardt Optimization Framework for Benchmarking MHD Flows over Backward-Facing Steps
Spyridon C. Katsoudas, Grigorios T. Chrimatopoulos, Michalis A. Xenos, Efstratios E. Tzirtzilakis
https://arxiv.org/abs/2507.16509

A Finite Volume and Levenberg-Marquardt Optimization Framework for Benchmarking MHD Flows over Backward-Facing Steps
This study examines the hydrodynamic and magnetohydrodynamic numerical solution of an electrically conducting fluid flow in a backward facing step (BFS) geometry under the influence of an external, uniform magnetic field applied at an angle. The numerical results are obtained utilizing the Finite Volume Method in a collocated grid configuration whereas the resulting system is solved directly using a Newton-like method in contrast to iterative approaches. The computed hydrodynamic results are va…

GeoSAM2: Unleashing the Power of SAM2 for 3D Part Segmentation
Ken Deng, Yunhan Yang, Jingxiang Sun, Xihui Liu, Yebin Liu, Ding Liang, Yan-Pei Cao
https://arxiv.org/abs/2508.14036

GeoSAM2: Unleashing the Power of SAM2 for 3D Part Segmentation
Modern 3D generation methods can rapidly create shapes from sparse or single views, but their outputs often lack geometric detail due to computational constraints. We present DetailGen3D, a generative approach specifically designed to enhance these generated 3D shapes. Our key insight is to model the coarse-to-fine transformation directly through data-dependent flows in latent space, avoiding the computational overhead of large-scale 3D generative models. We introduce a token matching strategy …

A Structure-Preserving Scheme for the Euler System with Potential Temperature Transport
K. R. Arun, Rahuldev Ghorai
https://arxiv.org/abs/2508.15416 https://

A Structure-Preserving Scheme for the Euler System with Potential Temperature Transport
We consider the compressible Euler equations with potential temperature transport, a system widely used in atmospheric modelling to describe adiabatic, inviscid flows. In the low Mach number regime, the equations become stiff and pose significant numerical challenges. We develop an all-speed, semi-implicit finite volume scheme that is asymptotic preserving (AP) in the low Mach limit and strictly positivity preserving for density and potential temperature. The scheme ensures stability and accura…

Replaced article(s) found for nlin.SI. https://arxiv.org/list/nlin.SI/new
[1/1]:
- A Lax representation and integrability of homogeneous exact magnetic flows on spheres in all dime...
Vladimir Dragovi\'c, Borislav Gaji\'c, Bo\v{z}idar Jovanovi\'c

Fixed points on null and tame flows for groups of automorphisms
Alessandro Codenotti
https://arxiv.org/abs/2507.12239 https://arxiv.org/pdf/2507.12239

Fixed points on null and tame flows for groups of automorphisms
Using a generalization of the Kechris-Pestov-Todorčević correspondence due to Nguyen Van Thé we obtain fixed point theorems for null and tame actions of groups of the form $\mathrm{Aut}(\mathcal F)$, where $\mathcal{F}$ is a Fraïssé structure. In particular we show that if $\mathrm{Age}(\mathcal F)$ is a free joint embedding class, then every null flow $\mathrm{Aut}(\mathcal F)\curvearrowright X$ has a fixed point, while if $\mathrm{Age}(\mathcal F)$ is a free amalgamation class, then ever…

A new study found that there's a universal rhythm to how people speak: in 0.6Hz (1.667s) units. I find this fascinating because that's pretty close (though obviously only coincidentally) to 20 μdays (0.579Hz = 1.728s) and this feeds my fantasy about decimal time (standardize on days, 1 milliday = 1.44min, 10 microdays = 0.864s, we'd probably make use of centidays, which are just shy of quarter hours).

A universal rhythm guides how we speak: Global analysis reveals 1.6-second 'intonation units'
Have you ever noticed that a natural conversation flows like a dance—pauses, emphases, and turns arriving just in time? A new study has discovered that this isn't just intuition; there is a biological rhythm embedded in our speech.

Stochastic intrinsic gradient flows on the Wasserstein space
Panpan Ren, Michael R\"ockner, Feng-Yu Wang, Simon Wittmann
https://arxiv.org/abs/2506.12755

Stochastic intrinsic gradient flows on the Wasserstein space
We construct stochastic gradient flows on the $2$-Wasserstein space $\mathcal P_2$ over $\mathbb R^d$ for energy functionals of the type $W_F(ρd x)=\int_{\mathbb R^d}F(x,ρ(x))d x$. The functions $F$ and $\partial_2 F$ are assumed to be locally Lipschitz on $\mathbb R^d\times (0,\infty)$. This includes the relevant examples of $W_F$ as the entropy functional or more generally the Lyapunov function of generalized porous media equations. First, we define a class of Gaussian-based measures $Λ$ o…

Reactive Semantics for User Interface Description Languages
Basile Pesin (Federation ENAC ISAE-SUPAERO ONERA, Universite de Toulouse, France), Celia Picard (Federation ENAC ISAE-SUPAERO ONERA, Universite de Toulouse, France), Cyril Allignol (Federation ENAC ISAE-SUPAERO ONERA, Universite de Toulouse, France)
https://arxiv.org/abs/2508.1361…

Reactive Semantics for User Interface Description Languages
User Interface Description Languages (UIDLs) are high-level languages that facilitate the development of Human-Machine Interfaces, such as Graphical User Interface (GUI) applications. They usually provide first-class primitives to specify how the program reacts to an external event (user input, network message), and how data flows through the program. Although these domain-specific languages are now widely used to implement safety-critical GUIs, little work has been invested in their formalizat…

Impact of the large-scale cosmic web on the X-ray emitting circumgalactic medium
Soumya Shreeram, Daniela Gal\'arraga-Espinosa, Johan Comparat, Andrea Merloni, Daisuke Nagai, C\'eline Peroux, Ilaria Marini, C\'eline Gouin, Kirpal Nandra, Yi Zhang, Gabriele Ponti, Anna Olechowska
https://arxiv.org/abs/2506.17222

Impact of the large-scale cosmic web on the X-ray emitting circumgalactic medium
The hot circumgalactic medium (CGM), probed by X-ray observations, plays a central role in understanding gas flows that drive a galaxy's evolution. While CGM properties have been widely studied, the influence of a galaxy's large-scale cosmic environment on the hot gas content remains less explored. We investigate how the large-scale cosmic web affects the X-ray surface brightness (XSB) profiles of galaxies in the context of cosmological simulations. We use our novel IllustrisTNG-based lightcone…

Characterizing the Dynamics of Conspiracy Related German Telegram Conversations during COVID-19
Elisabeth H\"oldrich, Mathias Angermaier, Jana Lasser, Joao Pinheiro-Neto
https://arxiv.org/abs/2507.13398

Characterizing the Dynamics of Conspiracy Related German Telegram Conversations during COVID-19
Conspiracy theories have long drawn public attention, but their explosive growth on platforms like Telegram during the COVID-19 pandemic raises pressing questions about their impact on societal trust, democracy, and public health. We provide a geographical, temporal and network analysis of the structure of of conspiracy-related German-language Telegram chats in a novel large-scale data set. We examine how information flows between regional user groups and influential broadcasting channels, reve…

Spatial Stark-Zeeman Systems and Their Regularizations
Seongchan Kim, Kevin Ruck
https://arxiv.org/abs/2507.15172 https://arxiv.org/p…

Spatial Stark-Zeeman Systems and Their Regularizations
In this article, we study spatial Stark-Zeeman systems which describe the dynamics of a charged particle moving in three-dimensional space under the influence of a Coulomb potential, a magnetic field, and an electric field, possibly time-dependent. Such systems are modeled by Hamiltonian flows on the cotangent bundle of an open subset of $\mathbb{R}^3, $ equipped with a twisted symplectic structure. The presence of the Coulomb singularity leads to the study of collision orbits, and hence unders…

A Kinematic Constraint on Pedestrian Walking: Power-law Scaling between Critical Angular Velocity and Speed
Jinghui Wang, Wei Lv, Chao Li, Yufei Li
https://arxiv.org/abs/2506.15321

A Kinematic Constraint on Pedestrian Walking: Power-law Scaling between Critical Angular Velocity and Speed
This paper presents a statistical analysis of speed and angular velocity obtained from pedestrian experiments across nine distinct datasets. Experimental scenarios included crossing motion, unidirectional/bidirectional flows, bidirectional/four-directional crossing flows, pedestrian-vehicle interactions, unidirectional flow in a circular corridor, and circle antipode configurations. We applied filtering methods to reduce noise and analyzed the data at different sampling frequencies. The results…

Glacial lake flood hits Juneau, Alaska, reflecting a growing risk as mountain glaciers melt around the world https://phys.org/news/2025-08-glacial-lake-juneau-alaska-mountain.html
Glacial flooding measured in real time at Juneau, Alaska

Glacial lake flood hits Juneau, Alaska, reflecting a growing risk as mountain glaciers melt around the world
Each summer in the mountains above Juneau, Alaska, meltwater from the massive Mendenhall Glacier flows into mountain lakes and into the Mendenhall River, which runs through town.

It's not a FAD: first results in using Flows for unsupervised Anomaly Detection at 40 MHz at the Large Hadron Collider
Francesco Vaselli, Maurizio Pierini, Maciej Mikolaj Glowacki, Thea Aarrestad, Katya Govorkova, Vladimir Loncar, Dimitrios Danopoulos, Felice Pantaleo
https://arxiv.org/abs/2508.11594

It's not a FAD: first results in using Flows for unsupervised Anomaly Detection at 40 MHz at the Large Hadron Collider
We present the first implementation of a Continuous Normalizing Flow (CNF) model for unsupervised anomaly detection within the realistic, high-rate environment of the Large Hadron Collider's L1 trigger systems. While CNFs typically define an anomaly score via a probabilistic likelihood, calculating this score requires solving an Ordinary Differential Equation, a procedure too complex for FPGA deployment. To overcome this, we propose a novel, hardware-friendly anomaly score defined as the square…

A neighbor invites me out for drinks once a month. Two hours, two beers. Every time. It’s VERY rigid.
Nonetheless, the conversation flows. Despite some differences, I think maybe we are friends. Or developing as friends… in that stilted way that adult men do.
As I’m getting out of the car, he says “see you next month” and I now feel like a networked commodity, primed for whenever he might need me for something.
In my head, I hear myself think, “just leave the money on the n…

Contact magnetic geodesic and sub-Riemannian flows on $V_{n,2}$ and integrable cases of a heavy rigid body with a gyrostat
Bozidar Jovanovic
https://arxiv.org/abs/2506.13101

Contact magnetic geodesic and sub-Riemannian flows on $V_{n,2}$ and integrable cases of a heavy rigid body with a gyrostat
We prove the integrability of magnetic geodesic flows of $SO(n)$--invariant Riemannian metrics on the rank two Stefel variety $V_{n,2}$ with respect to the magnetic field $η\, dα$, where $α$ is the standard contact form on $V_{n,2}$ and $η$ is a real parameter. Also, we prove the integrability of magnetic sub-Riemannian geodesic flows for $SO(n)$-invariant sub-Riemannian structures on $V_{n,2}$. All statements in the limit $η=0$ imply the integrability of the problems without the influence…

A compressible Reynolds-averaged mixing model considering turbulent entropy and heat flux
Hansong Xie, Tengfei Luo, Yaomin Zhao, Yousheng Zhang, Jianchun Wang
https://arxiv.org/abs/2506.16296

A compressible Reynolds-averaged mixing model considering turbulent entropy and heat flux
In typical nature and engineering scenarios, such as supernova explosion and inertial confinement fusion, mixing flows induced by hydrodynamics interfacial instabilities are essentially compressible. Despite their significance, accurate predictive tools for these compressible flows remain scarce. For engineering applications, the Reynolds-averaged Navier-Stokes (RANS) simulation stands out as the most practical approach due to its outstanding computational efficiency. However, the majority of R…

Pseudocriticality in antiferromagnetic spin chains
Sankalp Kumar, Sumiran Pujari, Jonathan D'Emidio
https://arxiv.org/abs/2506.16424 https://

Pseudocriticality in antiferromagnetic spin chains
Weak first-order pseudocriticality with approximate scale invariance has been observed in a variety of settings, including the intriguing case of deconfined criticality in 2+1 dimensions. Recently, this has been interpreted as extremely slow flows ("walking behavior") for real-valued couplings in proximity to a bona fide critical point with complex-valued couplings, described by a complex conformal field theory (CFT). Here we study an SU($N$) generalization of the the Heisenberg antiferromagnet…

Oil Flows Again
https://open.substack.com/pub/theclimatehistorian/p/oil-flows-again?utm_source=share&utm_medium=android&r=e4myx
> Monday, 4 August, 2025

Hot, cold, and multi-component accretion flows around supermassive black hole binaries
Christopher Tiede, Daniel J. D'Orazio
https://arxiv.org/abs/2508.11748 https://…

Hot, cold, and multi-component accretion flows around supermassive black hole binaries
We develop a model for supermassive black hole binaries (SMBHBs) accreting below their Eddington limit, focusing on systems where hot, advection-dominated flows become viable. We specifically explore the spectral appearance of multi-component accretion flows where the solution can independently transition between cold, thin disks and hot, advection-dominated torii depending on the local accretion rate. Using a three-disk model, we compute spectral energy distributions for four possible accretio…

Holography for stress-energy tensor flows
Xi-Yang Ran, Feng Hao, Hao Ouyang
https://arxiv.org/abs/2508.12275 https://arxiv.org/pdf/2508.12275

Holography for stress-energy tensor flows
We study the holographic description for general stress-energy tensor deformations in arbitrary dimensions using the metric flow approach. Mixed boundary conditions corresponding to these deformations emerge from solutions to the metric flow equations. To test this proposal, we analyze planar AdS black holes with such boundary conditions and find that the deformed energies satisfy flow equations consistent with the field theory interpretation. We further derive the commuting condition for stres…

Characterizing Neural Manifolds' Properties and Curvatures using Normalizing Flows
Peter Bouss, Sandra Nester, Kirsten Fischer, Claudia Merger, Alexandre Ren\'e, Moritz Helias
https://arxiv.org/abs/2506.12187

Characterizing Neural Manifolds' Properties and Curvatures using Normalizing Flows
Neuronal activity is found to lie on low-dimensional manifolds embedded within the high-dimensional neuron space. Variants of principal component analysis are frequently employed to assess these manifolds. These methods are, however, limited by assuming a Gaussian data distribution and a flat manifold. In this study, we introduce a method designed to satisfy three core objectives: (1) extract coordinated activity across neurons, described either statistically as correlations or geometrically as…

Non-uniqueness of weak solutions to the 3D Hall-MHD equations on the plane
Yi Peng, Huaqiao Wang, Chenlu Zhang
https://arxiv.org/abs/2508.11193 https://arx…

Non-uniqueness of weak solutions to the 3D Hall-MHD equations on the plane
We prove the non-uniqueness of weak solutions with non-trivial magnetic fields to the 3D Hall-MHD equations on the plane in the space $C^0_t L_x^2$ through the convex integration scheme and by constructing new errors and new intermittent flows. In particular, based on the construction of 3D intermittent flows, we obtain the $2\frac{1}{2}$D Mikado flows through a projection onto the plane. Moreover, we prove that the constructed weak solution do not conserve the magnetic helicity and find that w…

Levy Laplacian on manifold and heat flows of differential forms
Boris Volkov
https://arxiv.org/abs/2507.13013 https://arxiv.org/pdf/2…

Levy Laplacian on manifold and heat flows of differential forms
The Levy Laplacian is an infinite-dimensional differential operator, which is interesting for its connection with the Yang-Mills gauge fields. The article proves the equivalence of various definitions of the Levy Laplacian on the manifold of $H^1$-paths on a Riemannian manifold. The heat equation with the Levy Laplacian is considered. The tendency of some solutions of this heat equation to the locally constant functionals as time tends to infinity is studied. These solutions are constructed usi…

Modeling Targets and Optimal Frequencies for Imaging the Shadows of Nearby Supermassive Black Holes
J. Cole Faggert, Feryal Ozel, Dimitrios Psaltis
https://arxiv.org/abs/2506.15783

Modeling Targets and Optimal Frequencies for Imaging the Shadows of Nearby Supermassive Black Holes
Horizon-scale imaging of supermassive black holes has opened a new window onto the studies of strong-field gravity and plasma physics in low-luminosity accretion flows. As future efforts aim to image fainter and smaller angular-size targets, primarily through space-based very long baseline interferometry (VLBI), it is important to identify optimal sources and observing strategies for such studies. In this work, we assess the prospects for imaging black hole shadows in a broad population of near…

STARFlow: Scaling Latent Normalizing Flows for High-resolution Image Synthesis
Jiatao Gu, Tianrong Chen, David Berthelot, Huangjie Zheng, Yuyang Wang, Ruixiang Zhang, Laurent Dinh, Miguel Angel Bautista, Josh Susskind, Shuangfei Zhai
https://arxiv.org/abs/2506.06276

STARFlow: Scaling Latent Normalizing Flows for High-resolution Image Synthesis
We present STARFlow, a scalable generative model based on normalizing flows that achieves strong performance in high-resolution image synthesis. The core of STARFlow is Transformer Autoregressive Flow (TARFlow), which combines the expressive power of normalizing flows with the structured modeling capabilities of Autoregressive Transformers. We first establish the theoretical universality of TARFlow for modeling continuous distributions. Building on this foundation, we introduce several key arch…

Generative Super-Resolution of Turbulent Flows via Stochastic Interpolants
Martin Schi{\o}dt, Nikolaj Takata M\"ucke, Clara Marika Velte
https://arxiv.org/abs/2508.13770 ht…

Generative Super-Resolution of Turbulent Flows via Stochastic Interpolants
Capturing the intricate multiscale features of turbulent flows remains a fundamental challenge due to the limited resolution of experimental data and the computational cost of high-fidelity simulations. In many practical scenarios only coarse representations of the flows are feasible, leaving crucial fine-scale dynamics unresolved. This study addresses that limitation by leveraging generative models to perform super-resolution of velocity fields and reconstruct the unresolved scales from low-re…

Driven shear flow in biological magneto-active fluids
Malo Marmol, C\'ecile Cottin-Bizonne, Andrejs Cebers, Damien Faivre, Christophe Ybert
https://arxiv.org/abs/2507.13851

Driven shear flow in biological magneto-active fluids
Active fluids made of powered suspended particles have unique abilities to self-generate flow and density structures. How such dynamics can be triggered and leveraged by external cues is a key question of both biological and applied relevance. Here we use magnetotactic bacteria to explore how chemotaxis and magnetotaxis -- leading, respectively, to positional and orientational responses -- combine to generate global scale flows. Such steady regime can be quantitatively captured by a magneto-act…

Convergence of drift-diffusion PDEs arising as Wasserstein gradient flows of convex functions
L\'ena\"ic Chizat, Maria Colombo, Xavier Fern\'andez-Real
https://arxiv.org/abs/2507.12385

Convergence of drift-diffusion PDEs arising as Wasserstein gradient flows of convex functions
We study the quantitative convergence of drift-diffusion PDEs that arise as Wasserstein gradient flows of linearly convex functions over the space of probability measures on ${\mathbb R}^d$. In this setting, the objective is in general not displacement convex, so it is not clear a priori whether global convergence even holds. Still, our analysis reveals that diffusion {allows} a favorable interaction between Wasserstein geometry and linear convexity, leading to a general quantitative convergenc…

Evolution of Cluster Alignments as Evidence of Large-scale Structure Formation in the Universe: #GalaxyClusters trace invisible highways of dark matter stretching up to a billion light years across the universe; even more remarkable, the clusters point the way to their neighbors.

Multiscale patterns of migration flows in Austria: regionalization, administrative barriers, and urban-rural divides
Thomas Robiglio, Martina Contisciani, M\'arton Karsai, Tiago P. Peixoto
https://arxiv.org/abs/2507.11503

Multiscale patterns of migration flows in Austria: regionalization, administrative barriers, and urban-rural divides
Migration is central in various societal problems related to socioeconomic development. While much of the existing research has focused on international migration, migration patterns within a single country remain relatively unexplored. In this work we study internal migration patterns in Austria for a period of over 20 years, obtained from open and high-granularity administrative records. We employ inferential network methods to characterize the flows between municipalities and extract their c…

The Throughput Gain of Hypercycle-level Resource Reservation for Time-Triggered Ethernet
Peng Wang, Suman Sourav, Binbin Chen, Hongyan Li, Feng Wang, Fan Zhang
https://arxiv.org/abs/2506.11745

The Throughput Gain of Hypercycle-level Resource Reservation for Time-Triggered Ethernet
Time-Triggered Communication is a key technology for many safety-critical systems, with applications spanning the areas of aerospace and industrial control. Such communication relies on time-triggered flows, with each flow consisting of periodic packets originating from a source and destined for a destination node. Each packet needs to reach its destination before its deadline. Different flows can have different cycle lengths. To achieve assured transmission of time-triggered flows, existing ef…

Electron Heating in Hypersonic Flows: A New Thermodynamically Consistent Model
Felipe Martin Rodriguez Fuentes, Bernard Parent
https://arxiv.org/abs/2506.11457

Electron Heating in Hypersonic Flows: A New Thermodynamically Consistent Model
Accurate prediction of electron temperature ($T_{\rm e}$) in hypersonic non-equilibrium flows is critical, yet hampered by inadequate models for electron heating from vibrationally excited nitrogen. Prior models often relied on ad-hoc scaling or flawed applications of detailed balance that failed to ensure the convergence of electron and vibrational temperatures ($T_{\rm v}$) at thermal equilibrium. This paper introduces a novel, thermodynamically consistent electron heating model derived rigor…

Shi-type and Hamilton-type gradient estimates for a general parabolic equation under compact Finsler $CD(-K,N)$ geometric flows
Yijie Miao, Bin Shen
https://arxiv.org/abs/2506.14776

Shi-type and Hamilton-type gradient estimates for a general parabolic equation under compact Finsler $CD(-K,N)$ geometric flows
Recently, the Li-Yau-type gradient estimates for positive solutions to parabolic equations \begin{equation} \partial_t u=Δu+\mathcal{R}_1u+\mathcal{R}_2u^α+\mathcal{R}_3u(\log u)^β,\notag \end{equation} under the general compact Finsler $CD(-K,N)$ geometric flow are studied. Here $\mathcal{R}_1$,$\mathcal{R}_2$,$\mathcal{R}_3$ $\in$ $ C^{1}(M,[0,T])$, $α$ and $β$ are both positive constants, $T$ is the maximal existence time for the flow. However, compared with the Riemannian ca…

Special flow systems with the minimal self-joining property
Yibo Zhai
https://arxiv.org/abs/2507.10962 https://arxiv.org/pdf/2507.109…

Special flow systems with the minimal self-joining property
Arnol'd flows are a class of area-preserving flows on surfaces. In this paper, we prove that typical Arnol'd flows have the minimal self-joinings property. Consequently, we can classify centralizers and factors of typical Arnol'd flows.

Functional Renormalization Group Flows and Gauge Consistency in QED
Yoshio Echigo, Yuji Igarashi, Katsumi Itoh, Jan M. Pawlowski, Yu Takahashi
https://arxiv.org/abs/2507.12974

Functional Renormalization Group Flows and Gauge Consistency in QED
We consider quantum electrodynamics with chiral four-Fermi interactions in the functional renormalization group approach. In gauge theories, the functional flow equation for the effective action is accompanied by the quantum master equation that governs the underlying gauge symmetry. Beyond perturbation theory, fully gauge-consistent solutions are very difficult to obtain. We devise a systematic expansion scheme in which the solutions of the flow equation also solve the Quantum Master Equation.…

Enhanced dispersion of active microswimmers in confined flows
Marc Lagoin (LOMA), Juliette Lacherez (LOMA), Guirec de Tournemire (LOMA), Ahmad Badr (LOMA), Yacine Amarouchene (LOMA), Antoine Allard (LOMA, UB), Thomas Salez (LOMA)
https://arxiv.org/abs/2507.08369

Enhanced dispersion of active microswimmers in confined flows
In the presence of a laminar shear flow, the diffusion of passive colloidal particles is enhanced in the direction parallel to the flow. This classical phenomenon is known as Taylor-Aris dispersion. Besides, microorganisms, such as active microswimmers, exhibit an effective diffusive behavior at long times. Combining the two ingredients above, a natural question then emerges on how the effective diffusion of active microswimmers is altered in shear flows - a widespread situation in natural envi…

The interplay of the parametric instability and MRI in oscillatory shear flows
Callum W. Fairbairn, James M. Stone
https://arxiv.org/abs/2506.08839 https:/…

The interplay of the parametric instability and MRI in oscillatory shear flows
The evolution of warped disks is governed by internal, oscillatory shear flows driven by their distorted geometry. However, these flows are known to be vigorously unstable to a hydrodynamic parametric instability. In many warped systems this might coexist and compete with the magnetorotational instability. The interplay of these phenomena and their combined impact on the internal flows has not been studied. To this end we perform three-dimensional, magneto+hydrodynamic unstratified shearing box…

Elastic turbulence hides in the small scales of inertial polymeric turbulence
Piyush Garg, Marco Edoardo Rosti
https://arxiv.org/abs/2507.16789 https://arx…

Elastic turbulence hides in the small scales of inertial polymeric turbulence
Gaining a fundamental understanding of turbulent flows of dilute polymer solutions has been a challenging and outstanding problem for a long time. In this letter, we examine homogeneous, isotropic polymeric turbulence at large Reynolds and Deborah numbers through direct numerical simulations. While at the largest scales of the flow inertial turbulence exists, we find that the flow is fundamentally altered from Newtonian turbulence below the Kolmogorov scale. We demonstrate that `Elastic Turbule…

Mechanically Interlocked Polymers in Dilute Solution under Shear and Extensional Flows: A Brownian Dynamics Study
Ali Seyedi, Alex Albaugh
https://arxiv.org/abs/2506.13968

Mechanically Interlocked Polymers in Dilute Solution under Shear and Extensional Flows: A Brownian Dynamics Study
Mechanically interlocked polymers (MIPs) are a novel class of polymer structures in which the components are connected by mechanical bonds instead of covalent bonds. We measure the single-molecule rheological properties of polyrotaxanes, daisy chains, and polycatenanes under steady shear and steady uniaxial extension using coarse-grained Brownian dynamics simulations with hydrodynamic interactions. We obtain key rheological features, including tumbling dynamics, molecular extension, stress, and…

Replaced article(s) found for math.DG. https://arxiv.org/list/math.DG/new
[1/1]:
- Generic Dynamics of Mean Curvature Flows with Asymptotically Conical Singularities
Ao Sun, Jinxin Xue

The Role of Vortex Stretching in Drag Reduction of Polymer-Laden Turbulent Flow
Wouter J. T. Bos (LMFA), Xuan Shao, Tong Wu, Le Fang
https://arxiv.org/abs/2508.15349 https://

The Role of Vortex Stretching in Drag Reduction of Polymer-Laden Turbulent Flow
An addition of polymers can significantly reduce drag in wall-bounded turbulent flows, such as pipes or channels. This phenomenon is accompanied by a noticeable modification of the mean velocity profile. Starting from the premise that polymers reduce vortex-stretching, we derive a theoretical prediction for the mean-velocity profile. After assessing this prediction by numerical experiments of turbulence with reduced vortex stretching, we show that the theory successfully describes experimental …

Reduced Subgid Scale Terms in Three-Dimensional Turbulence
Rik Hoekstra, Wouter Edeling
https://arxiv.org/abs/2507.15539 https://arxiv.org/pdf/2507.15539…

Reduced Subgid Scale Terms in Three-Dimensional Turbulence
Large eddy simulation (LES) has become a central technique for simulating turbulent flows in engineering and applied sciences, offering a compromise between accuracy and computational cost by resolving large scale motions and modeling the effects of smaller, unresolved scales through a subgrid scale (SGS) model. The fidelity and robustness of LES depends critically on the SGS model, particularly in coarse simulations where much of the turbulence spectrum remains unresolved. In this work, we e…

Generalized Schur partition functions and RG flows
Anirudh Deb, Shlomo S. Razamat
https://arxiv.org/abs/2506.13764 https://arxiv.org/…

Generalized Schur partition functions and RG flows
We revisit a double-scaled limit of the superconformal index of ${\cal N}=2$ superconformal field theories (SCFTs) which generalizes the Schur index. The resulting partition function, $\hat {\cal Z}(q,α)$, has a standard $q$-expansion with coefficients depending on a continuous parameter $α$. The Schur index is a special case with $α=1$. Through explicit computations we argue that this partition function is an invariant of certain mass deformations and vacuum expectation value (vev) deformat…

A Hybrid Algorithm for Drift-Kinetic Particle Dynamics within General Relativistic Magnetohydrodynamics Simulations of Black Holes Accretion Flows
Tyler Trent, Dimitrios Psaltis, Feryal \"Ozel
https://arxiv.org/abs/2507.11616

A Hybrid Algorithm for Drift-Kinetic Particle Dynamics within General Relativistic Magnetohydrodynamics Simulations of Black Holes Accretion Flows
Astrophysical plasmas in relativistic spacetimes, such as black hole accretion flows, are often weakly collisional and require kinetic modeling to capture non-local transport and particle acceleration. However, the extreme scale separation between microscopic and macroscopic processes limits the feasibility of fully kinetic simulations. A covariant guiding center formalism has recently been derived to address this challenge in curved spacetimes. We present a new hybrid numerical algorithm based…

Intrinsic Incompatibility: Why Static Droplets Cannot Exist in Cahn-Hilliard-Navier-Stokes Systems
Jun Lai
https://arxiv.org/abs/2508.15712 https://arxiv.o…

Intrinsic Incompatibility: Why Static Droplets Cannot Exist in Cahn-Hilliard-Navier-Stokes Systems
Static droplets serve as fundamental benchmarks for interface-resolved simulations of two-phase flows. However, their accurate representation in phase-field models remains elusive due to persistent numerical artifacts. This work rigorously proves that static droplets cannot exist in phase-field models governed by the Cahn-Hilliard-Navier-Stokes equations. Through equilibrium analysis of the governing equations, we demonstrate that equilibrium necessitates uniform chemical potential, which nulli…

BRIDGES Lectures: Flows of geometric structures, especially $\mathrm{G}_2$-structures
Spiro Karigiannis
https://arxiv.org/abs/2508.11604 https://arxiv.org/…

BRIDGES Lectures: Flows of geometric structures, especially $\mathrm{G}_2$-structures
The BRIDGES meeting in gauge theory, extremal structures, and stability was held June 2024 at l'Institut d'Études Scientifiques de Cargèse in Corsica, organized by Daniele Faenzi, Eveline Legendre, Eric Loubeau, and Henrique Sá Earp. The first week was a summer school consisting of four independent but related lecture series by Oscar García Prada, Spiro Karigiannis, Laurent Manivel, and Ruxandra Moraru. The present document consists of notes for the lecture series by Spiro Karigiannis on "F…

Calibrated Semantic Diffusion: A p-Laplacian Synthesis with Learnable Dissipation, Quantified Constants, and Graph-Aware Calibration
Faruk Alpay, Hamdi Alakkad
https://arxiv.org/abs/2508.13658

Calibrated Semantic Diffusion: A p-Laplacian Synthesis with Learnable Dissipation, Quantified Constants, and Graph-Aware Calibration
We develop a calibrated diffusion framework by synthesizing three established concepts: linear Laplacian smoothing, nonlinear graph p-Laplacian flows, and a learnable dissipation term derived from a strongly convex potential. This synthesis provides a general model for graph-based diffusion with controllable dynamics. Our key theoretical results include a quantified two-regime decay analysis for $p>2$, which provides stronger, p-dependent transient bounds not captured by standard ISS templates,…

Reconnection-driven Flares in M87*: Proton-synchrotron Powered GeV Emission
Hayk Hakobyan, Amir Levinson, Lorenzo Sironi, Alexander Philippov, Bart Ripperda
https://arxiv.org/abs/2507.14002

Reconnection-driven Flares in M87*: Proton-synchrotron Powered GeV Emission
Magnetic reconnection in current layers that form intermittently in radiatively inefficient accretion flows onto black holes is a promising mechanism for particle acceleration and high-energy emission. It has been recently proposed that such layers, arising during flux eruption events, can power the rapid TeV flares observed from the core of M87. In this scenario, inverse Compton scattering of soft radiation from the accretion flow by energetic electron-positron pairs produced near the reconnec…

An Uncertainty Visualization Framework for Large-Scale Cardiovascular Flow Simulations: A Case Study on Aortic Stenosis
Xiao Xue, Tushar M. Athawale, Jon W. S. McCullough, Sharp C. Y. Lo, Ioannis Zacharoudiou, Balint Joo, Antigoni Georgiadou, Peter V. Coveney
https://arxiv.org/abs/2508.15420

An Uncertainty Visualization Framework for Large-Scale Cardiovascular Flow Simulations: A Case Study on Aortic Stenosis
We present a generalizable uncertainty quantification (UQ) and visualization framework for lattice Boltzmann method simulations of high Reynolds number vascular flows, demonstrated on a patient-specific stenosed aorta. The framework combines EasyVVUQ for parameter sampling with large-eddy simulation turbulence modeling in HemeLB, and executes ensembles on the Frontier exascale supercomputer. Spatially resolved metrics, including entropy and isosurface-crossing probability, are used to map uncer…

Replaced article(s) found for physics.flu-dyn. https://arxiv.org/list/physics.flu-dyn/new
[1/1]:
- Interpretable data-driven turbulence modeling for separated flows using symbolic regression with ...
Boqian Zhang, Juanmian Lei

Universal Observables, SUSY RG-Flows and Holography
Dimitrios Chatzis, Madison Hammond, Georgios Itsios, Carlos Nunez, Dimitrios Zoakos
https://arxiv.org/abs/2506.10062

Universal Observables, SUSY RG-Flows and Holography
We construct and analyse infinite classes of regular supergravity backgrounds dual to four-dimensional superconformal field theories (SCFTs) compactified on a circle with a supersymmetry-preserving twist. These flows lead to three-dimensional gapped QFTs preserving four supercharges. The solutions arise in Type IIB, Type IIA, and eleven-dimensional supergravity, and generalise known constructions by incorporating deformations that avoid typical singularities associated with the holographic desc…

Variability in Black Hole Accretion: Dependence on Rotational and Magnetic Energy Balance
Hyerin Cho, Ramesh Narayan
https://arxiv.org/abs/2507.13441 https…

Variability in Black Hole Accretion: Dependence on Rotational and Magnetic Energy Balance
Most general relativistic magnetohydrodynamic simulations of black hole (BH) hot accretion flows are initialized with small rotating tori and produce stable jets with only small fluctuations. However, recent studies using larger scale Bondi-like initial conditions have reported intermittent jet activity and loss of coherent rotation. To investigate the differences, we modify the standard torus setup across four BH spins: $a_*=0$, $0.5$, $0.9$, $-0.9$. First, we increase the torus size significa…

On a parabolic curvature lower bound generalizing Ricci flows
Marco Flaim, Erik Hupp
https://arxiv.org/abs/2507.05032 https://arxiv.o…

On a parabolic curvature lower bound generalizing Ricci flows
Optimal transport plays a major role in the study of manifolds with Ricci curvature bounded below. Some results in this setting have been extended to super Ricci flows, revealing a unified approach to analysis on Ricci nonnegative manifolds and Ricci flows. However we observe that the monotonicity of Perelman's functionals ($\mathcal{F}$, $\mathcal{W}$, reduced volume), which hold true for Ricci flows and Ricci nonnegative manifolds, cannot be strictly generalized to super Ricci flows. In 2010 …

Slip flows of a Bingham fluid in curved channels
S. J. Cox, S. M. Taghavi
https://arxiv.org/abs/2506.15303 https://arxiv.org/pdf/2506…

Slip flows of a Bingham fluid in curved channels
Motivated by the treatment of varicose veins with aqueous foams, we determine the velocity profiles and yield surface positions for pressure-driven flows of a Bingham fluid in curved channels, incorporating Navier wall slip to capture the slip behavior of aqueous foams. Assuming a constant pressure gradient -- consistent with syringe-driven injection in sclerotherapy -- we reproduce a closed-form analytic solution for the flow in a straight channel, and extend this to a uniformly curved channel…

The existence and uniqueness of infinite combinatorial Yamabe flows
Bohao Ji
https://arxiv.org/abs/2507.12355 https://arxiv.org/pdf/2…

The existence and uniqueness of infinite combinatorial Yamabe flows
In this paper, we study the combinatorial Yamabe flow on infinite triangulated surfaces in Euclidean background geometry, aiming for solving discrete Yamabe problem on noncompact surfaces. Under suitable conditions, we establish the short-time existence and uniqueness of the flow. We further introduce an extended version of the flow and prove its long-time existence. As an application, we prove the convergence result of the Yamabe flow in the case of hexagonal triangulations of the plane.

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…

On physical considerations regarding development and validation of Heat Flux Partitioning models: application to vertical boiling flows simulations
Luc Favre (IMFT, EDF R&D MFEE), Catherine Colin (IMFT), S. Pujet (EDF R&D MFEE), St\'ephane Mimouni (EDF R&D MFEE)
https://arxiv.org/abs/2507.12478

On physical considerations regarding development and validation of Heat Flux Partitioning models: application to vertical boiling flows simulations
As part of a critical assessment of wall boiling modeling through Heat Flux Partitioning approach, a new model dedicated to vertical boiling flows is proposed, with a revisited partitioning including a boiling heat flux related to bubble coalescence. Closure laws include a recent model for bubble dynamics, a new correlation for the bubble maximum lift-off diameter, and comprehensive selection of existing models for nucleation site density and bubble wait time. Each formulation are compared to r…

Mesoscience-based structural theory for heterogeneous gas-solid flows
Yige Liu, Bidan Zhao, Junwu Wang
https://arxiv.org/abs/2507.11010 https://

Mesoscience-based structural theory for heterogeneous gas-solid flows
Quantification of the spatiotemporal dynamics of heterogeneous gas-solid flows is critical for the design, scale-up and optimization of gas-solid reactors. In this article, by using the core concept of mesoscience (the compromise in competition between dominant mechanisms), a mathematically rigorous procedure is proposed to develop a mesoscience-based structural theory for the dynamics of heterogeneous gas-solid flows via describing the physical states corresponding to the realization of domina…

Viscoplastic flows in narrow channels: Herschel-Bulkley models versus its regularizations
Benedetta Calusi, Angiolo Farina, Lorenzo Fusi, Luigi Vergori
https://arxiv.org/abs/2506.12934

Viscoplastic flows in narrow channels: Herschel-Bulkley models versus its regularizations
We investigated the two-dimensional flows of a viscoplastic fluid in symmetric channels with impermeable walls under no-slip boundary conditions. As response functions for the Cauchy stress tensor of the viscoplastic fluid, we considered both the celebrated Herschel-Bulkley model and a very general class $\mathcal{C}$ of its regularizations that depend on a positive parameter with the same physical dimensions as the strain rate and known as the \emph{regularization parameter}. Within this class…

A fluctuating lattice Boltzmann method for viscoelastic fluid flows
Juanyong Wang, Xinyue Liu, Lei Wang, Yuan Yu, Yiran Ji
https://arxiv.org/abs/2506.13072

A fluctuating lattice Boltzmann method for viscoelastic fluid flows
This study introduces a novel fluctuating lattice Boltzmann (LB) method for simulating viscoelastic fluid flows governed by the Oldroyd-B model. In contrast to conventional LB approaches that explicitly compute the divergence of the polymer stress tensor using finite-difference schemes, the proposed method incorporates the polymer stress implicitly by introducing a polymer stress fluctuation term directly into the evolution equation. This treatment avoids the need for stress-gradient computatio…

SQG Point Vortex Dynamics with Order Rossby Corrections
Mac Lee, Stefan Llewellyn Smith
https://arxiv.org/abs/2508.12619 https://arxiv.org/pdf/2508.12619…

SQG Point Vortex Dynamics with Order Rossby Corrections
Quasi-geostrophic flow is an asymptotic theory for flows in rotating systems that are in geostrophic balance to leading order. It is characterized by the conservation of (quasi-geostrophic) potential vorticity and weak vertical flows. Surface quasigeostrophy (SQG) is the special case when the flow is driven by temperature anomalies at a horizontal boundary. The next-order correction to QG, QG+, takes into account ageostrophic effects. We investigate point vortx dynamics in SQG+, building on the…

A predictive model for bubble-particle collisions in turbulence
Timothy T. K. Chan (Physics of Fluids Group, University of Twente), Linfeng Jiang (Physics of Fluids Group, University of Twente, Institute of Aerodynamics, RWTH Aachen University), Dominik Krug (Physics of Fluids Group, University of Twente, Institute of Aerodynamics, RWTH Aachen University)

A predictive model for bubble-particle collisions in turbulence
The modelling of bubble-particle collisions is crucial to improving the efficiency of industrial processes such as froth flotation. Although such systems usually have turbulent flows and the bubbles are typically much larger than the particles, there currently exist no predictive models for this case which consistently include finite-size effects in the interaction with the bubbles as well as inertial effects for the particles simultaneously. As a first step, Jiang and Krug (J. Fluid Mech., vol…

Evaluation of Analytical Turbulence Closures for Quasi-Geostrophic Ocean Flows with Coastal Boundaries
Anantha Narayanan Suresh Babu, Akhil Sadam, Pierre F. J. Lermusiaux
https://arxiv.org/abs/2508.06678

Evaluation of Analytical Turbulence Closures for Quasi-Geostrophic Ocean Flows with Coastal Boundaries
Numerical turbulence simulations typically involve parameterizations such as Large Eddy Simulations (LES). Applications to geophysical flows, especially ocean flows, are further complicated by the presence of complex topography and interior landforms such as coastlines, islands, and capes. In this work, we extend pseudo-spectral quasi-geostrophic (QG) numerical schemes and GPU-based solvers to simulate flows with coastal boundaries using the Brinkman volume penalization approach. We incorporate…

Enhancing wall-to-wall heat transport with unsteady flow perturbations
Silas Alben, Xiaojia Wang, Nicole Vuong
https://arxiv.org/abs/2507.12564 https://

Enhancing wall-to-wall heat transport with unsteady flow perturbations
We determine unsteady flow perturbations that are optimal for enhancing the rate of heat transfer between hot and cold walls (i.e. the Nusselt number Nu), under the constraint of fixed flow power (Pe$^2$, where Pe is the Péclet number). The unsteady flows are perturbations of previously computed optimal steady flows and are given by eigenmodes of the Hessian matrix of Nu, the matrix of second derivatives with respect to amplitudes of flow mode coefficients. Positive eigenvalues of the Hessian …

Anomalous Transport of Elongated Particles in Oscillatory Vortical Flows
Shiyuan Hu, Xiuyuan Yang, Nan Luo, Jun Zhang, Xingkun Man
https://arxiv.org/abs/2508.09677 https://

Anomalous Transport of Elongated Particles in Oscillatory Vortical Flows
We investigate the transport dynamics of elongated particles in cellular vortical flows that undergo spatial oscillations over time. Experimental flow visualizations reveal mixed flow fields with chaotic and elliptic regions coexisting. Surprisingly, the particle transport rate does not increase monotonically with particle length, even though longer particles are expected to explore neighboring vortices more easily. Numerical simulations in a much larger system produce similar transport anomali…

Stability analysis of transitional flows based on disturbance magnitude
Ofek Frank-Shapir, Igal Gluzman
https://arxiv.org/abs/2507.05036 https://

Stability analysis of transitional flows based on disturbance magnitude
We utilize input-output analysis and the small gain theorem to derive a disturbance-based criterion for analyzing the stability of flows. A detailed study is conducted on applying this criterion to three canonical flows: Couette, plane Poiseuille, and Blasius flows, considering three input-output approaches: unstructured, structured with non-repeated blocks, and structured with repeated blocks. By covering a wide range of Reynolds numbers for each flow, we reveal a complex interplay between dom…