Tootfinder

Polar Filaments Capture High Latitude Solar Poloidal Field Interactions and can Foretell the Future Sunspot Cycle Amplitude before Polar Field Precursors
Srinjana Routh, Shaonwita Pal, Dibyendu Nandy, Subhamoy Chatterjee, Dipankar Banerjee, Mohd. Saleem Khan
https://arxiv.org/abs/2510.12142

Polar Filaments Capture High Latitude Solar Poloidal Field Interactions and can Foretell the Future Sunspot Cycle Amplitude before Polar Field Precursors
Polar fields at the minimum of a sunspot cycle -- which are a manifestation of the radial component of the Sun's poloidal field -- are deemed to be the best indicator of the strength of the toroidal component, and hence the amplitude of the future sunspot cycle. However, the Sun's polar magnetic fields are difficult to constrain with ground-based or space-based observations from near the plane-of-ecliptic. In this context, polar filaments -- dark, elongated structures that overlie polarity inve…

heise | Polar Grit X2: Kompakte Sportuhr (nicht nur) für Frauen im Test
In der vergleichsweise zierlichen Grit X2 bringt Polar seine aktuellste Technik unter. Was taugt sie gegenüber Apple Watch & Co.?
h…

In-plane polar domains enhanced energy storage
Yu Lei, Xiaoming Shi, Sihan Yan, Qinghua Zhang, Jiecheng Liu, Sixu Wang, Yu Chen, Jiaou Wang, He Qi, Qian Li, Ting Lin, Jingfen Li, Qing Zhu, Haoyu Wang, Jing Chen, Lincong Shu, Linkun Wang, Han Wu, Xianran Xing
https://arxiv.org/abs/2510.11126

In-plane polar domains enhanced energy storage
Relaxor ferroelectric thin films are recognized for their ultrahigh power density, rendering them highly promising for energy storage applications in electrical and electronic systems. However, achieving high energy storage performance with chemically homogeneous, environmentally friendly and compositionally stable materials remains challenging. In this work, we present a design of dielectrics with high energy storage performance via an in-plane polar domains incorporating polar nanoregions mec…

The polar debris disc around 99 Herculis: A potential signpost for polar circumbinary planets
Jeremy L. Smallwood, William DeRocco, Zhizhen Qin, Antranik A. Sefilian
https://arxiv.org/abs/2510.08698

The polar debris disc around 99 Herculis: A potential signpost for polar circumbinary planets
The nearby binary star system 99 Herculis (99 Her) is host to the only known polar-aligned circumbinary debris disc. We investigate the hypothesis that the narrow structure of this circumbinary disc is sculpted by the gravitational influence of one or more unseen polar circumbinary planets. We first establish the theoretically viable parameter space for a sculpting planet by considering dynamical stability and clearing mechanisms, including the chaotic zone, Hill radius, diffusion, and polar al…

"Underwater curtains and reflective beads are ‘unrealistic and dangerous polar geoengineering ideas’"
#Geoengineering #Climate #ClimateChange

Next week I will participate with the @… @… @… Horizon funded research projects in a policy briefing in Brussels, with MEP Group on Climate Change, Biodiversity & Sustainable Development @eupolarcluster.bsky.social
Remote participation possible if you're interested in what we have to say about Polar Science for Global Action and Strengthening Climate Preparedness through EU Leadership
https://polarres.eu/polarresevents/polar-science-for-global-action/

Polar Loop: Displayfreies Wearable ohne Abo als mögliche Alternative zu Whoop
Der finnische Sportuhrenhersteller Polar hat mit dem Loop sein erstes Wearable ohne Display auf den Markt gebracht. Im Unterschied zu Whoop kommt es ohne Abo.

There's this fascination with what science is discovering about unexpected ecosystems, coupled with dismay at the changes we are causing without intent, thought, or (unfortunately) care. Until it's too late to stop what we are doing, to our own detriment

Serial Polar Automorphism Ensemble Decoders for Physical Unclonable Functions
Marvin R\"ubenacke, Sebastian Cammerer, Michael Sullivan, Alexander Keller
https://arxiv.org/abs/2510.09220

Serial Polar Automorphism Ensemble Decoders for Physical Unclonable Functions
Physical unclonable functions (PUFs) involve challenging practical applications of error-correcting codes (ECCs), requiring extremely low failure rates on the order of $10^{-6}$ and below despite raw input bit error rates as high as 22%. These requirements call for an efficient ultra-low rate code design. In this work, we propose a novel coding scheme tailored for PUFs based on Polar codes and a low-complexity version of automorphism ensemble decoding (AED). Notably, our serial AED scheme reuse…

🧊 From ANTARCTICA to DONBAS: a Ukrainian POLAR explorer's journey #shorts: https://benborges.xyz/2025/11/13/from-antarctica-to-donbas-a.html

Passivation-Free Ga-Polar AlGaN/GaN Recessed-Gate HEMTs on Sapphire with 2.8 W/mm POUT and 26.8% PAE at 94 GHz
Ruixin Bai, Swarnav Mukhopadhyay, Michael Elliott, Ryan Gilbert, Jiahao Chen, Rafael A. Choudhury, Kyudong Kim, Yu-Chun Wang, Ahmad E. Islam, Andrew J. Green, Shubhra S. Pasayat, Chirag Gupta
https://arxiv.org/abs/2510.08933

Passivation-Free Ga-Polar AlGaN/GaN Recessed-Gate HEMTs on Sapphire with 2.8 W/mm POUT and 26.8% PAE at 94 GHz
In this work, we demonstrate a passivation-free Ga-polar recessed-gate AlGaN/GaN HEMT on a sapphire substrate for W-band operation, featuring a 5.5 nm Al0.35Ga0.65N barrier under the gate and a 31 nm Al0.35Ga0.65N barrier in the gate access regions. The device achieves a drain current density of 1.8 A/mm, a peak transconductance of 750 mS/mm, and low gate leakage with a high on/off ratio of 10^7. Small-signal characterization reveals a current-gain cutoff frequency of 127 GHz and a maximum osci…

Magnetic White Dwarf -- M Dwarf Binaries in Pre-polar Phase as Special Population of Long-Period Radio Transients
Yuan-Pei Yang
https://arxiv.org/abs/2509.09224 https://

Magnetic White Dwarf -- M Dwarf Binaries in Pre-polar Phase as Special Population of Long-Period Radio Transients
Long-period radio transients (LPTs) are a new class of coherent radio sources with periods ranging from minutes to hours. Recently, two LPT sources, ILT J1101+5521 and GLEAM-X J0704-37, with periods of 2-3 hours has been confirmed to originate from white dwarf (WD) -- M dwarf (MD) binaries. In this work, we propose that at least some LPTs originate from the magnetic WD -- MD binaries in the pre-polar phase. The asynchronism between the WD's rotation and the binary's orbital motion allows for th…

Data-independent Beamforming for End-to-end Multichannel Multi-speaker ASR
Can Cui, Paul Magron, Mostafa Sadeghi, Emmanuel Vincent
https://arxiv.org/abs/2509.10234 https://

Data-independent Beamforming for End-to-end Multichannel Multi-speaker ASR
Automatic speech recognition (ASR) in multichannel, multi-speaker scenarios remains challenging due to ambient noise, reverberation and overlapping speakers. In this paper, we propose a beamforming approach that processes specific angular sectors based on their spherical polar coordinates before applying an end-to-end multichannel, multi-speaker ASR system. This method is data-independent and training-free. We demonstrate that using a group of beamformed signals improves ASR performance compare…

PLATOSpec's first results: planets WASP-35b and TOI-622b are on aligned orbits, and K2-237b is on a polar orbit
J. Zak, P. Kabath, H. M. J. Boffin, J. Liptak, M. Skarka, R. Brahm, P. Gajdo\v{s}, A. Bocchieri, D. Itrich, L. Vanzi, P. Pintr, J. Janik, A. Hatzes
https://arxiv.org/abs/2508.10145

PLATOSpec's first results: planets WASP-35b and TOI-622b are on aligned orbits, and K2-237b is on a polar orbit
The spin-orbit angle between a stellar spin axis and its planetary orbital axis is a key diagnostic of planetary migration pathways, yet the mechanisms shaping the observed spin-orbit distribution remain incompletely understood. Combining the spin-orbit angle with atmospheric measurements has emerged as a powerful method of studying exoplanets that showcases the synergy between ground- and space-based observations. We present the Rossiter-McLaughlin effect measurements of the projected spin-orb…

UV-dark polar ovals on #Jupiter as tracers of magnetosphere–atmosphere connections: https://de.slideshare.net/slideshow/uv-dark-polar-ovals-on-jupiter-as-tracers-of-magnetosphere-atmosphere-connections/273806682 or https://researchportal.northumbria.ac.uk/ws/portalfiles/portal/176663394/tsubota_manuscript_revision1_complete.pdf (sorry, found these OA versions only now) -> Magnetic Tornado Is Stirring Up the Haze at Jupiter’s Poles: https://vcresearch.berkeley.edu/news/magnetic-tornado-stirring-haze-jupiters-poles - unusual magnetically driven vortices may be generating Earth-size concentrations of hydrocarbon haze.

Exploration on the Two-stream Instability in the Polar Cusp Under Solar Storm Disturbances and its Potential Impacts on Spacecraft
Jikai Sun, Lei Chang, Yu Liu, Guojun Wang, Zichen Kan, Shijie Zhang, Jingjing Ma, Dingzhou Li, Yingxin Zhao
https://arxiv.org/abs/2509.09126

Exploration on the Two-stream Instability in the Polar Cusp Under Solar Storm Disturbances and its Potential Impacts on Spacecraft
During solar storms, the polar cusp often exhibits electron populations with distinct velocity distributions, which may be associated with the two-stream instability. This study reveals the evolution of the two-stream instability associated with electron velocities and the interaction between the growth phase of the two-stream instability and the electrostatic solitary waves (ESWs). The results from particle-in-cell (PIC) simulations are compared with satellite observational data and computatio…

Disorder to Order Transition in 1D Nonreciprocal Cahn-Hilliard Model
Navdeep Rana, Ramin Golestanian
https://arxiv.org/abs/2510.11580 https://arxiv.org/pdf…

Disorder to Order Transition in 1D Nonreciprocal Cahn-Hilliard Model
We extensively study the phenomenology of one dimensional Nonreciprocal Cahn Hilliard model for varying nonreciprocity $(α)$ and different boundary conditions. At small $α$, a perturbed uniform state evolves to a defect laden configuration that lacks global polar order. Defects are the sources and sinks of travelling waves and nonreciprocity selects defects with a unique wave number that increases monotonically with $α_c$. A critical threshold $α_c$ marks the onset of a transition to states…

Heh yes. Pretty much this.
"Much more will be written about proposals to build massive undersea walls to hold up Antarctic ice sheets, drill bore holes in Greenland to pump out lubricating meltwater, or scatter glass beads over glaciers. As informed and erudite I'm sure this will be, I don't think it will be as effective as simply yelling "What the hell do you think you are doing?!”"
@… reads through the lines and interprets our recent #Geoengineering paper into plain english in this entertaining blogpost
https://www.technosphere.earth/new-report-concludes-polar-geoengineering-is-dangerous/

Polar launches the $199 Polar Loop, a screen-free fitness band to track activity, sleep, and more without a subscription, in three colors, shipping September 10 (Samantha Kelly/Bloomberg)
https://www.bloomberg.com/news/articles/20

Fast Polarisation-Aware Decoder for Non-Binary Polar Codes
Joseph Jabbour, Ali Chamas Al-Ghouwayel, Emmanuel Boutillon
https://arxiv.org/abs/2509.09554 https://

Fast Polarisation-Aware Decoder for Non-Binary Polar Codes
The paper investigates the emerging field of low-complexity non-binary polar code (NB-PC) decoders. It shows that customizing each kernel of an NB-PC decoder through offline analysis can significantly reduce the overall decoding complexity. The proposed decoder, referred to as the Fast Successive Cancellation-Polarization Aware (FSC-PA) scheme, achieves this by minimizing the computational load of parity-check nodes that share the same level of input polarization. The NB polar decoder is develo…

SCIENCE WARRIORS: From Antarctica — STRAIGHT INTO BATTLE! Polar defenders showed their double front: https://benborges.xyz/2025/11/13/science-warriors-from-antarctica-straight.html

Republicans try to weaken 50-year-old law protecting whales, seals and polar bears (Patrick Whittle/Associated Press)
https://abcnews.go.com/Politics/wireStory/republicans-weaken-50-year-law-protecting-whales-seals-126425918
http://www.memeorandum.com/251011/p30#a251011p30

Intelligent Prediction and Optimization of Open-Hole Wellbore Multiphysics Stability: A Synergistic PINN-DRL Approach
Yu Song, Zehua Song, Jin Yang, Kejin Chen, Kun Jiang, Jizhou Tang
https://arxiv.org/abs/2510.09638

Intelligent Prediction and Optimization of Open-Hole Wellbore Multiphysics Stability: A Synergistic PINN-DRL Approach
To address the dual challenge of predicting multiphysics-induced instability and optimizing drilling fluid parameters for open-hole wellbores under long-term exposure, a high-fidelity system of coupled governing equations was developed. This system integrates seepage, hydration-induced softening, thermal diffusion, and elasto-plastic response to capture the nonlinear dynamics of wellbore stability evolution. A two-dimensional numerical model in a polar coordinate system was established using CO…

Mechanical coupling of polar topologies and oxygen octahedra rotations in PbTiO$_3$/SrTiO$_3$ superlattices
Fernando G\'omez-Ortiz, Louis Bastogne, Xu He, Philippe Ghosez
https://arxiv.org/abs/2510.08216

Mechanical coupling of polar topologies and oxygen octahedra rotations in PbTiO$_3$/SrTiO$_3$ superlattices
PbTiO$_3$/SrTiO$_3$ artificial superlattices recently emerged as a prototypical platform for the emergence and study of polar topologies. While previous studies mainly focused on the polar textures inherent to the ferroelectric PbTiO$_3$ layers, the oxygen octahedra rotations inherent to the paraelectric SrTiO$_3$ layers have attracted much little attention. Here, we highlight a biunivocal relationship between distinct polar topologies -- including $a_1/a_2$ domains, polar vortices, and skyrmio…

"It is clear to us that the assessed approaches are not feasible, and that further research into these techniques would not be an effective use of limited time and resources. It is vital that these ideas do not distract from the priority to reduce greenhouse gas (GHG) emissions or from the critical need to conduct fundamental research in the polar regions."
New paper out today led by Martin Siegert and ft. (on here) me and @… and about 40 others where we argue that some of the proposed #Polar #Geoengineering schemes are dangerous, misleading and unethical...
#AskMeAnything if you'd like to know more.
https://www.frontiersin.org/journals/science/articles/10.3389/fsci.2025.1527393/full
.

Rotating twisted magnetosphere of magnetars: approximate analytical solutions
H. Tong, L. Chen
https://arxiv.org/abs/2509.10017 https://arxiv.org/pdf/2509.…

Rotating twisted magnetosphere of magnetars: approximate analytical solutions
An approximate analytical solution for the rotating twisted magnetosphere of magnetars is presented. The poloidal flux is approximated by the self-similar twisted dipole field. The toroidal field is obtained by the minimum torque model. Under this approximation, it is found that: (1) The Y-point radius decreases with the increase of twist of the magnetic field. (2) The polar cap is larger for larger twist. (3) The particle outflow luminosity is larger for larger twist. (4) The maximum accelerat…

Concentrated N-dimensional AMM with Polar Coordinates in Rust
Vasily Tolstikov, Marcus Wentz, Joseph Schiarizzi, Derek Ding
https://arxiv.org/abs/2510.05428 https://

Concentrated N-dimensional AMM with Polar Coordinates in Rust
We expand on the recent development of n-dimensional automated market makers for stablecoins by showing a way to build concentrated liquidity positions with ticks in polar coordinates in Rust, including the featured ability to skew said concentrated liquidity. We highlight the risk of stacking too many stablecoin pools and how to hedge said risk.

Co-existence of longitudinal and transverse oscillations in polar plumes observed with Solar Orbiter/EUI
Upasna Baweja, Vaibhav Pant, S. Krishna Prasad, Arpit Kumar Shrivastav, Tom Van Doorsselaere, Nancy Narang, Cis Verbeeck, M. Saleem Khan, David Berghmans
https://arxiv.org/abs/2509.07796

Co-existence of longitudinal and transverse oscillations in polar plumes observed with Solar Orbiter/EUI
Magnetohydrodynamic (MHD) waves play a key role in heating the solar corona and driving the solar wind. Recent observations have shown the presence of slow magneto-acoustic and Alfvénic waves in polar plumes and inter-plumes. However, a complete understanding of wave dynamics in the polar regions has long been limited by the lack of simultaneous, high-resolution observations. In this study, we utilize high spatial (210 km per pixel) and high cadence (5s) dataset from the Extreme Ultraviolet Im…

Certain Inequalities for the generalized polar derivative of a polynomial
N. A. Rathe, D. R. Bhat, I. Dar
https://arxiv.org/abs/2510.02775 https://arxiv.or…

Certain Inequalities for the generalized polar derivative of a polynomial
Recently Rather et al. \cite{NT} considered the generalized derivative and the generalized polar derivative and studied the relative position of zeros of generalized derivative and generalized polar derivative with respect to the zeros of polynomial.\\ \indent In this paper, we establish some inequalities that estimate the maximum modulus of generalized derivative and the generalized polar derivative of the polynomial $P(z)$, which is also the extension of recently known results.

A Study of Neural Polar Decoders for Communication
Rom Hirsch, Ziv Aharoni, Henry D. Pfister, Haim H. Permuter
https://arxiv.org/abs/2510.03069 https://arx…

A Study of Neural Polar Decoders for Communication
In this paper, we adapt and analyze Neural Polar Decoders (NPDs) for end-to-end communication systems. While prior work demonstrated the effectiveness of NPDs on synthetic channels, this study extends the NPD to real-world communication systems. The NPD was adapted to complete OFDM and single-carrier communication systems. To satisfy practical system requirements, the NPD is extended to support any code length via rate matching, higher-order modulations, and robustness across diverse channel co…

☯️ Political polar opposites may be more alike than they think
#psychology

Political polar opposites may be more alike than they think
The brains of politically extreme individuals, whether left- or right-leaning, appear to respond to and process political information in surprisingly similar ways, according to research published in the Journal of Personality and Social Psychology. The paper is titled "Politically extreme individuals exhibit similar neural processing despite ideological differences."

Me entering the lake for a swim #Uckermark #coldswim

Design and Scientific Prospects of the POLAR-2 Mission
Merlin Kole, Nicolas de Angelis, Jiang He, Hongbang Liu, Jianchao Sun, Fei Xie, Jimmy Zaid
https://arxiv.org/abs/2510.02016

Design and Scientific Prospects of the POLAR-2 Mission
The POLAR-2 mission consists of 3 instruments designed with the combined aim of producing a deeper understanding of Gamma-Ray Bursts. To achieve this, POLAR-2 relies on polarisation measurements and, for the first time will provide these using 2 separate polarimeter detectors. The first of these is a payload optimised to perform Compton polarimetry measurements in the 40-1000 keV energy range using a combination of plastic scintillators and SiPMs. The development of this payload, the design of …

Intertwined polar, chiral, and ferro-rotational orders in a rotation-only insulator
Weizhe Zhang, June Ho Yeo, Xiaoyu Guo, Tony Chiang, Nishkarsh Agarwal, John T. Heron, Kai Sun, Junjie Yang, Sang-Wook Cheong, Youngjun Ahn, Liuyan Zhao
https://arxiv.org/abs/2509.08650

Intertwined polar, chiral, and ferro-rotational orders in a rotation-only insulator
Intertwined orders refer to strongly coupled and mutually dependent orders that coexist in correlated electron systems, often underpinning key physical properties of the host materials. Among them, polar, chiral, and ferro-rotational orders have been theoretically known to form a closed set of intertwined orders. However, experimental investigation into their mutual coupling and physical consequences has remained elusive. In this work, we employ the polar-chiral insulator Ni$_3$TeO$_6$ as a pla…

The dual foliation of polar actions on nonnegatively curved manifolds
Yi Shi
https://arxiv.org/abs/2509.24155 https://arxiv.org/pdf/2509.24155

The dual foliation of polar actions on nonnegatively curved manifolds
We prove that any dual leaf $L^{\#}$ of a simply connected, complete nonnegatively curved polar manifold $M$ is totally geodesic and closed in $M$, and $L^{\#}$ is itself a complete nonnegatively curved polar manifold. Furthermore, the dual foliation on $M$ induces a Riemannian submersion with totally geodesic fibers from $M$ to a homogeneous space.

On an island in the Arctic Ocean, in a region that is warming as much as seven times as fast as the rest of the planet, the food chain is being turned upside down.
Underwater kelp forests are surging into once-frozen waters, replacing other native species.
Reindeer, cut off from traditional foraging routes over vanishing sea ice, now graze on seaweed when they cannot reach inland grasses and lichen.
And polar bears, deprived of the ice platforms they once used to hunt seals, …

Curious Reindeer and Charging Polar Bears: The Changing Wildlife at the Top of the Earth
Climate change is transforming ecosystems in the far north. An international team of scientists has made some surprising discoveries.

POLAR: Automating Cyber Threat Prioritization through LLM-Powered Assessment
Luoxi Tang, Yuqiao Meng, Ankita Patra, Weicheng Ma, Muchao Ye, Zhaohan Xi
https://arxiv.org/abs/2510.01552

POLAR: Automating Cyber Threat Prioritization through LLM-Powered Assessment
Large Language Models (LLMs) are intensively used to assist security analysts in counteracting the rapid exploitation of cyber threats, wherein LLMs offer cyber threat intelligence (CTI) to support vulnerability assessment and incident response. While recent work has shown that LLMs can support a wide range of CTI tasks such as threat analysis, vulnerability detection, and intrusion defense, significant performance gaps persist in practical deployments. In this paper, we investigate the intrins…

Who wants tpo come and work with me and a brilliant group of polar scientists on the latest generation of #climate models and #EarthObservation data?
We're running a hackathon in the @… and @… PISCO projects in November...
https://fediscience.org/@PolarRES/115191376209325795

Replaced article(s) found for math.MG. https://arxiv.org/list/math.MG/new
[1/1]:
- On the polar of Schneider's difference body
Juli\'an Haddad, Dylan Langharst, Galyna V. Livshyts, Eli Putterman

Safe Gap-based Planning in Dynamic Settings
Max Asselmeier, Abdel Zaro, Dhruv Ahuja, Ye Zhao, Patricio A. Vela
https://arxiv.org/abs/2509.07239 https://arx…

Safe Gap-based Planning in Dynamic Settings
This chapter extends the family of perception-informed gap-based local planners to dynamic environments. Existing perception-informed local planners that operate in dynamic environments often rely on emergent or empirical robustness for collision avoidance as opposed to performing formal analysis of dynamic obstacles. This proposed planner, dynamic gap, explicitly addresses dynamic obstacles through several steps in the planning pipeline. First, polar regions of free space known as gaps are tra…

Gamma-Ray Burst Polarimetry with the POLAR and POLAR-2 missions
Nicolas De Angelis, Philipp Azzarello, Franck Cadoux, Kurt Dittrich, Yannick Favre, Jochen Greiner, Johannes Hulsman, Coralie Husi, Merlin Kole, Hancheng Li, Slawomir Mianowski, Gabriel Pelleriti, Agnieszka Pollo, Nicolas Produit, Dominik Rybka, Jianchao Sun, Xin Wu, Shuang-Nan Zhang
https://

Gamma-Ray Burst Polarimetry with the POLAR and POLAR-2 missions
Gamma-Ray Bursts are among the most powerful and violent events in the Universe. Despite over half a century of observations of these transient sources, many open questions remain about their nature and the physical emission mechanisms at play. Polarization measurements of the GRB prompt gamma-ray emission have long been theorized to be able to answer most of these questions. Early polarization measurements did not allow to draw clear conclusions because of limited significance. With the aim …

Harnessing the polar vortex motion in oxide heterostructures
Pushpendra Gupta, Mohit Tanwani, Qi Xu, Guanshihan Du, Peiran Tong, Yongjun Wu, Zijian Hong, He Tian, Ramamoorthy Ramesh, Sujit Das
https://arxiv.org/abs/2509.06189

Harnessing the polar vortex motion in oxide heterostructures
Polar topology, an analogue of the magnetic topology, serves as a large playground for exotic physical phenomena with a wide range of multifunctional applications. Polar vortices and skyrmions are representative polar topologies that have been predicted to significantly enhance the functionality and information density of nanoelectronic devices due to their ultrasmall dimensions. Despite these advantages, the practical realization of polar topologies in devices is impeded by the intrinsic chall…

Bidifferentials, Lagrangian projections and the Virasoro extension
Eduard Looijenga
https://arxiv.org/abs/2510.08208 https://arxiv.org/pdf/2510.08208

Bidifferentials, Lagrangian projections and the Virasoro extension
Let $C$ be a smooth projective curve over an algebraically closed field $k$ of characteristic zero. We prove that a Lagrangian supplement of $H^0(C, Ω_C)$ in the de Rham cohomology group $H^1_{dR}(C)$ determines and is determined by a particular type of symmetric bidifferential on $C^2$ (its polar divisor must be twice the diagonal and have biresidue one along it). When $k$ is the complex field, a natural choice of such supplement is $H^{0,1}(C)$ and we show that this corresponds with the bidi…

Topological polar textures on CsPbBr3 nanoplatelets
Monika Bhakar, Pooja Bhardwaj, Gokul M. Anilkumar, Atikur Rahman, Goutam Sheet
https://arxiv.org/abs/2509.01751 https://

Topological polar textures on CsPbBr3 nanoplatelets
Polar topological textures like the bubble domains, flux--closures, and labyrinth etc., unlock functional responses in ferroic systems but are difficult to stabilize and control in chemically simple, solution--grown materials. Here we show that ultra--thin, large--area CsPbBr$_3$ nanoplatelets host room--temperature ferroelectric bubble domains whose characteristic size is tunable by thickness. Using contact--resonance piezoresponse force microscopy (PFM) across 125ñm--2\~$μ$m, we observe a s…

The elephants viewed by tourists from the swimming pool of the Elephant Bay Hotel are part of the largest captive herd in the world, brought to the river twice daily from the nearby Pinnawala Elephant Orphanage. For $16 tourists can visit the elephant orphanage, and pay an extra fee to “wash” and pose next to an elephant in the river.
From NPR's Goats & Soda:

What goes on inside the #Mars north polar vortex? https://meetingorganizer.copernicus.org/EPSC-DPS2025/EPSC-DPS2025-1438.html -> Mars’s Chilly North Polar Vortex Creates a Seasonal Ozone Layer: https://www.europlanet.org/epsc-dps2025-marss-chilly-north-polar-vortex-creates-a-seasonal-ozone-layer/

Batalin-Fradkin-Vilkovisky Quantization of FLPR model
Ansha S. Nair, Saurabh Gupta
https://arxiv.org/abs/2509.05632 https://arxiv.org/pdf/2509.05632…

Batalin-Fradkin-Vilkovisky Quantization of FLPR model
We quantize the Friedberg-Lee-Pang-Ren (FLPR) model within the framework of Batalin-Fradkin-Vilkovisky (BFV) formalism. We construct the nilpotent Becchi-Rouet-Stora-Tyutin (BRST) charges using constraints and the fermionic gauge-fixing function by means of admissible gauge conditions. We also derive the BRST invariant effective action and corresponding symmetries of the model in both polar and Cartesian coordinates. Additionally, with the help of BRST charge, we demonstrate that the physical s…

Successive Cancellation Decoding For General Monotone Chain Polar Codes
Zichang Ren, Chunhang Zheng, Dou Li, Yuping Zhao
https://arxiv.org/abs/2509.03128 https://

Successive Cancellation Decoding For General Monotone Chain Polar Codes
Monotone chain polar codes generalize classical polar codes to multivariate settings, offering a flexible approach for achieving the entire admissible rate region in the distributed lossless coding problem. However, this flexibility also introduces significant challenges for existing successive cancellation (SC) based decoding schemes. Motivated by the need for a general SC decoding solution, we present a comprehensive decoding strategy for monotone chain polar codes that can handle arbitrary n…

Asymptotic root distribution of polynomials under repeated polar differentiation
Daniel Perales, Zhiyuan Yang
https://arxiv.org/abs/2508.18575 https://arxi…

Asymptotic root distribution of polynomials under repeated polar differentiation
Given a sequence of real rooted polynomials $\{p_n\}_{n\geq 1}$ with a fixed asymptotic root distribution, we study the asymptotic root distribution of the repeated polar derivatives of this sequence. This limiting distribution can be seen as the result of fractional free convolution and pushforward maps along Möbius transforms for distributions. This new family of operations on measures forms a semigroup and satisfy some other nice properties. Using the fact that polar derivatives commute wit…

Towards an application of fourth-order shear statistics II: Efficient estimation of fourth-order shear correlation functions and an application to the DES Y3 data
Lucas Porth, Elena Silvestre-Rosello, Peter Schneider, Martina Larma
https://arxiv.org/abs/2509.07974

Towards an application of fourth-order shear statistics II: Efficient estimation of fourth-order shear correlation functions and an application to the DES Y3 data
Higher-order lensing statistics contain a wealth of cosmological information that is not captured by second-order statistics. Stage-III lensing surveys have sufficient statistical power to significantly detect cumulant-based statistics up to fourth order. We derive and validate an efficient estimation procedure for the four-point correlation function (4PCF) of polar fields such as weak lensing shear. We then use our approach to measure the shear 4PCF and the fourth-order aperture mass statistic…

Strain-induced multiferroicity in Cr1/3NbS2
Y. Sun, Y. Ahn, D. Sapkota, H. S. Arachchige, R. Xue, S. Mozaffari, D. G. Mandrus, L. Zhao, J. Orenstein, V. Sunko
https://arxiv.org/abs/2510.11619

Strain-induced multiferroicity in Cr1/3NbS2
Multiferroic materials, in which electric polarization and magnetic order coexist and couple, offer rich opportunities for both fundamental discovery and technology. However, multiferroicity remains rare due to conflicting electronic requirements for ferroelectricity and magnetism. One route to circumvent this challenge is to exploit the noncollinear ordering of spin cycloids, whose symmetry permits the emergence of polar order. In this work, we introduce another pathway to multiferroic order i…

Formation of oriented polar molecules with a single shaped pulse
Murilo D. Forlevesi, Edson Denis Leonel, Emanuel F. de Lima
https://arxiv.org/abs/2509.11968 https://

Formation of oriented polar molecules with a single shaped pulse
We explore the possibility of forming a oriented polar molecule directly from a pair of colliding atoms. The process comprises the photoassociation and vibrational stabilization along with the molecular orientation. These processes are driven by a single time-dependent, linearly polarized control field and proceeds entirely within the electronic ground state, leveraging the presence of a permanent dipole moment. The control field is found by means of an optimal quantum control algorithm with a …

I need anyone giant and muscly to give me the biggest hug of my life and to let me sleep on your chest hair or the polar opposite, strangely shiny flesh

Solving PDEs on Surfaces of Pipe Geometries Using New Coordinate Transformations and High-order Compact Finite Differences
Shuaifei Hu, Yujian Jiao, Desong Kong, Li-Lian Wang
https://arxiv.org/abs/2509.06507

Solving PDEs on Surfaces of Pipe Geometries Using New Coordinate Transformations and High-order Compact Finite Differences
We introduce suitable coordinate systems for pipes and their variants that allow us to transform partial differential equations (PDEs) on the pipe surfaces or in the solid pipes into computational domains with fixed limits/ranges. Such a notion is reminiscent of the polar and cylindrical coordinates for their advantageous geometries. The new curvilinear coordinates are non-orthogonal in two directions, so the Laplace--Beltrami operators involve mixed derivatives. To deal with the variable coeff…

Replaced article(s) found for physics.space-ph. https://arxiv.org/list/physics.space-ph/new
[1/1]:
- Contemporaneous Appearances of Auroral Spiral and Transpolar Arc: Polar UVI Observations and Glob...
Motoharu Nowada, Yukinaga Miyashita, Aoi Nakamizo, Noora Partamies, Qu…

Polar subcodes for MIMO systems
Liudmila Karakchieva, Peter Trifonov
https://arxiv.org/abs/2508.20684 https://arxiv.org/pdf/2508.20684

Polar subcodes for MIMO systems
Polar-coded multiple-input multiple-output systems are investigated. An advanced receiver implementing joint list decoding of polar codes and QR- and MMSE-based detectors is proposed. The approximate and exact path metrics are derived for joint list decoder of polar codes. A construction of polar subcodes for MIMO systems with cross-antenna dynamic freezing constraints is proposed. The obtained polar subcodes provide significant performance gain compared to LDPC-coded MIMO systems with the same…

Atmospheric CO2 Ice in the Martian Polar Regions: Physical and Spectral Properties From Mars Climate Sounder Observations
R. W. Stevens, P. O. Hayne, A. Kleinb\"ohl, D. M. Kass
https://arxiv.org/abs/2509.02897

Atmospheric CO2 Ice in the Martian Polar Regions: Physical and Spectral Properties From Mars Climate Sounder Observations
$\text{CO}_{\text{2}}$ ice clouds are important for polar energy balance and the carbon dioxide cycle on Mars. However, uncertainties remain regarding their physical and radiative properties, which control how polar $\text{CO}_{\text{2}}$ clouds interact with the global Martian climate. Here, we use Mars Climate Sounder (MCS) observations of atmospheric radiance to estimate these physical and radiative properties. We find that Martian $\text{CO}_{\text{2}}$ clouds are typically composed of larg…

Op aanraden van de krant luister ik nu naar de nieuwe plaat van Meral Polar: Meydan. Niet mijn muziek, maar goed om minstens één keer de hele plaat te horen. Heel veel verschillende energie. Hier het nummer Ötme bülbül ötme
https://www.youtube.com/watch?v=tRlRrQ21MbE
> Provided to Yo…

List of constructions of $NO^ (6,2)$
Valentino Smaldore
https://arxiv.org/abs/2510.03235 https://arxiv.org/pdf/2510.03235

List of constructions of $NO^+(6,2)$
In this note, we list many equivalent constructions of the tangent polar graph $NO^+(6,2)$.

Nonlinear planar Hall effect from superconducting vortex motion
Mio Hashimoto, Takako Konoike, Tomoki Kobayashi, Shintaro Hoshino, Takuya Kawada, Tomoyuki Yokouchi, Shinya Uji, Atsutaka Maeda, Yuki Shiomi
https://arxiv.org/abs/2509.06313

Nonlinear planar Hall effect from superconducting vortex motion
We report the nonreciprocal charge transport along the longitudinal and transverse directions in the vortex flow regime of FeSe superconducting films. Clear nonreciprocal signals under an inplane magnetic field reveals symmetry breaking at the film surfaces since the crystal structure of FeSe is centrosymmetric. Although the symmetry in such polar superconductors allows the nonreciprocal transverse response under a magnetic field parallel to the electric current, its observation is physically c…

Multimodal Topological Textures Arising from Coupled Structural Orders in SrTiO$_3$
Fernando G\'omez-Ortiz, Louis Bastogne, Philippe Ghosez
https://arxiv.org/abs/2510.08186 …

Multimodal Topological Textures Arising from Coupled Structural Orders in SrTiO$_3$
Magnetic spin topological textures recently found their electrical counterparts in polar topologies emerging from the condensation of inhomogeneous polar atomic distortions. Here, we further extend the concept to other non-polar atomic degrees of freedom. Taking SrTiO$_3$ as a prototypical example, we investigate from second-principles atomistic simulations, the equilibrium domain structures and topological textures associated with the natural antiferrodistortive rotations of its oxygen octahed…

Variations of the vector magnetic structures in the solar polar regions observed by Hinode
Shuhong Yang, Chunlan Jin, Qiao Song, Yuzong Zhang, Yin Li, Yijun Hou, Ting Li, Guiping Zhou, Yuanyong Deng, Jingxiu Wang
https://arxiv.org/abs/2509.19739

Variations of the vector magnetic structures in the solar polar regions observed by Hinode
Using the polar vector magnetic field data observed by Hinode from 2012 to 2021, we study the long-term variations of the magnetic flux, the flux proportion of different polarities, and the magnetic inclination with respect to the local normal in the solar polar regions above 70 degree latitude during solar cycle 24. In both polar regions after the polarity reversal, the unsigned magnetic fluxes of the dominant polarity increased to a peak of about 1.3$\times$10$^{22}$ Mx during the solar minim…

Homogeneous steady states for the generalized surface quasi-geostrophic equations
Ken Abe, Javier G\'omez-Serrano, In-Jee Jeong
https://arxiv.org/abs/2510.03009 https://

Homogeneous steady states for the generalized surface quasi-geostrophic equations
We consider homogeneous (stationary self-similar) solutions to the generalized surface quasi-geostrophic (gSQG) equations parametrized by the constant $0

Eggers decomposition of polar curves in positive characteristic
Ana Bel\'en de Felipe, Evelia R. Garc\'ia Barroso, Janusz Gwo\'zdziewicz
https://arxiv.org/abs/2509.24078

Eggers decomposition of polar curves in positive characteristic
Let $f$ be a power series in two variables with coefficients in an algebraically closed field of positive characteristic. We identify a necessary and sufficient condition, read from the Eggers-Wall tree of $f$, for $\frac{\partial f}{\partial y}$ to admit Eggers decomposition.

Polars and antipodal sets for the outer $3$-symmetric space $\mathbb{S}^7 \times \mathbb{S}^7$
Jost-Heinrich Eschenburg, Takashi Sakai
https://arxiv.org/abs/2509.05912 https://

Polars and antipodal sets for the outer $3$-symmetric space $\mathbb{S}^7 \times \mathbb{S}^7$
We determine the polar and the maximal antipodal set $P$ for the outer 3-symmetric space $\mathbb{S}^7 \times \mathbb{S}^7 = \mathrm{Spin}_8/G_2$ where the 3-symmetric structure is given by the triality automorphism $τ$ on $\mathrm{Spin}_8$. It turns out that $P$ has three elements. The 3-symmetric structure extends to a (non-abelian) $S_3$-structure which we also investigate.

"Air temperatures over Antarctica have soared 35ºC above average. What does this unusual event mean for Australia?"
#Australia #Antarctica #Climate

Air temperatures over Antarctica have soared 35ºC above average. What does this unusual event mean for Australia?
The stratospheric polar vortex high above Antarctica has rapidly heated up. These sudden bursts of heat can bring rapid weather changes in Australia

🖲️ This novel 3D printer kinematic system uses a mouse sensor for closed-loop control
https://blog.arduino.cc/2025/08/12/this-novel-3d-printer-kinematic-system-uses-a-mouse-sensor-for-closed-loop-control/

This novel 3D printer kinematic system uses a mouse sensor for closed-loop control | Arduino Blog
Robert Murray-Smith wants to experiment with a novel 3D printer kinematic system that drives a round bed through a friction interface — essentially a polar 3D printer, but without the backlash associated with gears. However, friction drives have a tendency to slip and so he will need closed-loop control of the system and that will […]

Source PAC Coding for Low-latency Secret Key Generation in Short Blocklength Regime
Lulu Song, Di Zhang, Tingting Zhang
https://arxiv.org/abs/2510.03818 https://

Source PAC Coding for Low-latency Secret Key Generation in Short Blocklength Regime
Source polar coding is a potential solution for short blocklength-based low-latency key generation with limited sources, which is a critical aspect of six generation (6G) Internet of things. However, existing source coding schemes still suffer from significant degradation in key generation rate and reconciliation reliability in short blocklength regime. To address this issue, we introduce a multilevel source polarization-adjusted convolutional (PAC) coding framework. Furthermore, we propose a n…

A Note on the Paper "Localization of Zeros of Polar Polynomials on the Unit Disk"
Renato Alvarez-Nodarse, Kenier Castillo
https://arxiv.org/abs/2510.01703 https://

A Note on the Paper "Localization of Zeros of Polar Polynomials on the Unit Disk"
In this note we show that the only result of [Rocky Mountain J. Math. 54 (2024), no. 4, 995--1004] is nothing more than a misformulated version of an exercise from classical texts, presented with a flawed proof. To place the matter on firmer ground, we provide instead a direct solution of a more general problem.

Phase Separation Kinetics in a Polar Active Field Model
Massimiliano Semeraro, Leticia F. Cugliandolo, Giuseppe Gonnella, Adriano Tiribocchi
https://arxiv.org/abs/2508.13888 htt…

Phase Separation Kinetics in a Polar Active Field Model
A milestone of phase separation kinetics is the emergence of universal power laws $\sim t^{1/z}$ governing the domain growth evolution. We investigate a phase-separating polar active model comprising a scalar density field with an advective coupling to a polarization field. Our analysis reveals a novel $\sim t^{0.6}$ regime, which agrees well with the accelerated growth recently observed in simulations of polar active particles. We provide analytical arguments to explain how advection facilitat…

Quasiparticle effects and strong excitonic features in exfoliable 1D semiconducting materials
Simone Grillo, Chiara Cignarella, Friedhelm Bechstedt, Paola Gori, Maurizia Palummo, Davide Campi, Nicola Marzari, Olivia Pulci
https://arxiv.org/abs/2510.09194

Quasiparticle effects and strong excitonic features in exfoliable 1D semiconducting materials
We report a comprehensive first-principles study of the electronic and optical properties of recently identified exfoliable one-dimensional semiconducting materials, focusing on chalcogenide-based atomic chains derived from van der Waals-bonded bulk crystals. Specifically, we investigate covalently bonded S3 and Te3 chains, and polar-bonded As2S3 and Bi2Te3 chains, using a fully first-principles approach that combines density-functional theory (DFT), density-functional perturbation theory (DFPT…

A Cold and Super-Puffy Planet on a Polar Orbit
Juan I. Espinoza-Retamal, Rafael Brahm, Cristobal Petrovich, Andr\'es Jord\'an, Thomas Henning, Trifon Trifonov, Joshua N. Winn, Erika Rea, Maximilian N. G\"unther, Abdelkrim Agabi, Philippe Bendjoya, Hareesh Bhaskar, Fran\c{c}ois Bouchy, M\'arcio Catelan, Carolina Charalambous, Vincent Deloupy, George Dransfield, Jan Eberhardt, N\'estor Espinoza, Alix V. Freckelton, Tristan Guillot, Melissa J. Hobson, Mat\'ias I. …

A Cold and Super-Puffy Planet on a Polar Orbit
We report the discovery of TOI-4507 b, a transiting sub-Saturn with a density $<0.3$ g/cm$^3$ on a 105-day polar orbit around a $700$ Myr old F star. The transits were detected using data from TESS as well as the Antarctic telescope ASTEP. A joint analysis of the light curves and radial velocities from HARPS, FEROS, and CORALIE confirmed the planetary nature of the signal by limiting the mass to be below $30\,M_\oplus$ at $95\%$ confidence. The radial velocities also exhibit the Rossiter-McLaug…

A Refined Orbital Ephemeris for the Intermediate Polar FO Aquarii and Evidence for a Period Derivative
Peter Garnavich (Notre Dame), Jordan Tweddale (Notre Dame), Colin Littlefield (BAERI)
https://arxiv.org/abs/2509.22786

A Refined Orbital Ephemeris for the Intermediate Polar FO Aquarii and Evidence for a Period Derivative
We combine more than 40 years of eclipse timings of the intermediate polar FO Aqr and derive new orbital ephemerides. The eclipse times are best fit with a second order polynomial, implying an $8σ$ detection of a period derivative. The results show that the orbital period of FO Aqr is currently increasing, with a derivative of $\dot{P}=6.65\pm0.81\times10^{-11}$.

Relative Position Matters: Trajectory Prediction and Planning with Polar Representation
Bozhou Zhang, Nan Song, Bingzhao Gao, Li Zhang
https://arxiv.org/abs/2508.11492 https://

Relative Position Matters: Trajectory Prediction and Planning with Polar Representation
Trajectory prediction and planning in autonomous driving are highly challenging due to the complexity of predicting surrounding agents' movements and planning the ego agent's actions in dynamic environments. Existing methods encode map and agent positions and decode future trajectories in Cartesian coordinates. However, modeling the relationships between the ego vehicle and surrounding traffic elements in Cartesian space can be suboptimal, as it does not naturally capture the varying influence …

Deterministic single-photon source over the terahertz regime
Caspar Groiseau, Miguel \'A. Mart\'inez-Garc\'ia, Diego Mart\'in-Cano, Carlos S\'anchez Mu\~noz
https://arxiv.org/abs/2509.26486

Deterministic single-photon source over the terahertz regime
We propose a deterministic single-photon source in the terahertz (THz) regime, triggered by a sequence of coherent optical pulses. The scheme leverages the permanent dipole moment of a single-polar quantum emitter to induce THz transitions between optically dressed states, enhanced by a resonant coupling to a hybrid THz cavity. We present a cavity design that delivers high efficiency, purity, and indistinguishability while also enabling easy tunability of the emission frequency across the THz r…

On the Origin of Carrier Loss in Mg-Doped N-Polar GaN
Masahiro Kamiyama, Shashwat Rathkanthiwar, Cristyan Qui\~nones-Garc\'ia, Seiji Mita, Dolar Khachariya, Pramod Reddy, Ronny Kirste, Ram\'on Collazo, Zlatko Sitar
https://arxiv.org/abs/2510.04381

On the Origin of Carrier Loss in Mg-Doped N-Polar GaN
The neutral $(V_N-3Mg_{Ga})^0$ complex was found to be the primary compensator in Mg-doped, N-polar GaN. The experimental data showed a sharp drop in hole concentration once [Mg] exceeded ~$10^{19} cm^{-3}$. Temperature-dependent Hall measurements, in conjunction with a charge balance model, revealed that the carrier loss was due to a drastic reduction in acceptor concentration ($N_A$), suggesting that a significant fraction of Mg atoms incorporated in an electrically neutral configuration. A q…

Stockmayer Fluid with a Shifted Dipole: Interfacial Behavior
Samuel Varner, Pierre J. Walker, Ananya Venkatachalam, Bilin Zhuang, Zhen-Gang Wang
https://arxiv.org/abs/2509.05523

Stockmayer Fluid with a Shifted Dipole: Interfacial Behavior
We investigate the properties of the liquid-vapor interface in the shifted Stockmayer fluid using molecular dynamics simulations in the canonical ensemble. We study the role of the dipole moment strength and the degree of asymmmetry on equilibrium interfacial characteristics, including density profiles, polar order, nematic order, interfacial polarization, electric field, and electrostatic potential. In addition, we compute angular distribution functions across the interface to gain insight int…

Precoded Polar Product Decoder Based on Soft-Output SCL Decoding and Maximization of Generalized Mutual Information
Nicol\'as Alvarez Prado, Andreas Stra{\ss}hofer
https://arxiv.org/abs/2508.20580 …

Precoded Polar Product Decoder Based on Soft-Output SCL Decoding and Maximization of Generalized Mutual Information
We combine two approaches to optimize the iterative decoding of product codes with precoded polar component codes. On one side, we generate bitwise soft messages based on the codebook probability, an approximation of an auxiliary quantity that considers all valid decoding paths of a successive cancellation list (SCL) decoder. On the other side, we scale the soft information during message passing with offline-computed coefficients, which maximize the generalized mutual information (GMI) between…

Domain Boundaries in a Metallic Distortive Polar Metal
Adrian Savovici, Barak Ratzker, Xuyang Zhou, Stefan Zaefferer, Martina Ruffino, Iliya Radulov, Patricia Jovi\v{c}evi\'c-Klug, Shyam Katnagallu, Amir Hamzehei, Philipp Watermeyer, Alexandra Vogel, J\"org Neugebauer, Christoph Freysoldt, Dierk Raabe
https://arxiv.org/abs/2509.23…

Domain Boundaries in a Metallic Distortive Polar Metal
Polar metals are an underexplored material class combining two properties that are typically incompatible, namely a polar crystal structure and reasonable electrical conductivity. While intriguing given that metals favor centrosymmetry, these materials also exhibit potential functional properties relevant to memory, optoelectronic, catalytic, and other applications. The distortive polar metal (DPM) subclass forms through a centrosymmetry-lifting phase transformation into a polar crystal structu…

Enhanced Successive Cancellation List Decoder for Long Polar Codes Targeting 6G Air Interface
Jiajie Li, Sihui Shen, Warren J. Gross
https://arxiv.org/abs/2508.16498 https://

Enhanced Successive Cancellation List Decoder for Long Polar Codes Targeting 6G Air Interface
The 6th generation communication standard's air interface requires innovation in channel coding to fulfill anticipated energy and area cost reduction requirements. In this paper, we propose algorithmic techniques to enable the implementation of long polar codes (e.g., length 8K bits) in next-generation communications standards by addressing key challenges in memory usage and computational complexity presented by successive decoding list (SCL) polar decoding. Perturbation-enhanced (PE) successiv…

Phase-resolved spectroscopic observations of the magnetic cataclysmic binary EF Eridani: Revealing complex magnetic accretion during a high state
Zwidofhela N. Khangale, Stephen B. Potter, David A. H. Buckley, Paul E. Barrett
https://arxiv.org/abs/2510.08266

Phase-resolved spectroscopic observations of the magnetic cataclysmic binary EF Eridani: Revealing complex magnetic accretion during a high state
We present high-resolution, phase-resolved spectroscopic observations of the polar EF Eri, obtained with SALT and the SAAO 1.9-m telescope during its recent emergence from a three-decade-long low state. The average spectrum shows strong emission from the Balmer lines (H$α$ and H$β$) and He~\textsc{ii} 4686 Å, along with weaker emission from the He~\textsc{i} lines and the Bowen fluorescence (C~\textsc{iii}/N~\textsc{iii}) blend at 4650 Å. The emission lines redward of 5500 Å transition to …

Direct determination of antiferroelectric-to-ferroelectric phase transition pathways in PbZrO$_3$ with Operando Electron Microscopy
Menglin Zhu, Michael Xu, Louis Alaerts, Hao Pan, Colin Gilgenbach, Geoffroy Hautier, Lane W. Martin, James M. LeBeau
https://arxiv.org/abs/2509.07194

Direct determination of antiferroelectric-to-ferroelectric phase transition pathways in PbZrO$_3$ with Operando Electron Microscopy
Under a sufficiently high applied electric field, a non-polar antiferroelectric material, such as \ce{PbZrO3}, can undergo a rapid transformation to a polar ferroelectric phase. While this behavior is promising for energy storage and electromechanical applications, a complete understanding of the atomic-scale mechanisms governing the phase transition remain elusive. Here, we employ \textit{operando} scanning transmission electron microscopy electric field biasing to directly resolve the antifer…

Radio emission from beyond the light cylinder in millisecond pulsars
Michael Kramer (MPIfR), Simon Johnston (CSIRO)
https://arxiv.org/abs/2510.05778 https://

Radio emission from beyond the light cylinder in millisecond pulsars
A striking aspect of the radio profiles of many millisecond pulsars (MSPs) is that they consist of components separated from each other by regions lacking in emission. We devise a technique for determining "disjoint" from "contiguous" components and show that 35% of MSPs have disjoint components as opposed to only 3% of the slow pulsar population. We surmise that the pulsars with these disjoint components show evidence for both emission above the polar cap and from the current sheet beyond the …

Reduction principles for proper actions
Leonardo Biliotti, Gustavo May Custodio, Alessandro Minuzzo
https://arxiv.org/abs/2509.19915 https://arxiv.org/pdf/…

Reduction principles for proper actions
We study the core of a proper action by a Lie group $G$ on a smooth manifold $M$, extending the construction for $G$ compact by Skjelbred and Straume. Moreover, we show that many properties of a proper $G$-action on $M$ are determined by the action of a group $G'$ on the corresponding core $_cM$. We say that such properties admit a reduction principle. In particular, we prove that a proper isometric $G$-action on $M$ is polar (resp. hyperpolar) if and only if the $G'$-action on $_cM$ is polar (…

Turbulent Dynamics in Active Solids
Wilhelm Sunde Lie, Ingve Simonsen, Paul Gunnar Dommersnes
https://arxiv.org/abs/2510.02461 https://arxiv.org/pdf/2510.0…

Turbulent Dynamics in Active Solids
We investigate numerically the polar ordering dynamics in the active elastic solid model (AES) and find classic signatures of turbulent dynamics: power-law scaling for the energy spectrum and non-Gaussian statistics of velocity increments. However, there is no energy cascade, in line with previous findings for active turbulence in fluids. The results extend the concept of active turbulence to solid systems and are expected to be important for understanding active biological solids, such as bact…

Role of sunspot latitude versus tilt in determining the polar field and amplitude of the next cycle: Cause of the weak Solar Cycle 20
Bidisha Dey, Anu Sreedevi, Bidya Binay Karak
https://arxiv.org/abs/2509.17146

Role of sunspot latitude versus tilt in determining the polar field and amplitude of the next cycle: Cause of the weak Solar Cycle 20
One prominent feature of solar cycle is its irregular variation in its cycle strength, making it challenging to predict the amplitude of the next cycle. Studies show that fluctuations and nonlinearity in generating poloidal field throughout the decay and dispersal of tilted sunspots produce variation in the solar cycle. The flux, latitudinal position, and tilt angle of sunspots are the primary parameters that determine the polar field and, thus, the next solar cycle strength. By analysing the o…

Nanoscale Polar Landscapes in Quantum Paraelectric SrTiO3
Yang Zhang, Suk Hyun Sung, Nishkarsh Agarwal, Maya Gates, Cong Li, Pu Yu, Robert Hovden, Ismail El Baggari
https://arxiv.org/abs/2509.24969

Nanoscale Polar Landscapes in Quantum Paraelectric SrTiO3
SrTiO3 is a textbook quantum paraelectric, with ferroelectricity purportedly suppressed by quantum fluctuations of ionic positions down to the lowest temperatures. The precise real space structure of SrTiO3 at low temperature, however, has remained undefined despite decades of study. Here we directly image the low-temperature polar structure of quantum parelectric SrTiO3, using cryogenic scanning transmission electron microscopy down to 20 K. High resolution imaging reveals a spatially fluctuat…

Learning Microswimmer Collision Dynamics and Predicting Diffusivities using a Neural-Network-Assisted Boltzmann Approach
Haruki Hayano, Akira Furukawa, Kang Kim
https://arxiv.org/abs/2510.02559

Learning Microswimmer Collision Dynamics and Predicting Diffusivities using a Neural-Network-Assisted Boltzmann Approach
We present a neural-network--assisted Boltzmann framework that learns the binary-collision map of microswimmers from data and uses it to evaluate collision integrals efficiently. Using a representative model swimmer, the learned map provides quantitative predictions for rotational and translational diffusivities and allows a linear-stability analysis of the isotropic state against polar ordering in dilute suspensions. The resulting predictions closely match direct simulations in the dilute regi…

Polar Mounds on Strangeon Stars: the Neutrino Emission from Ultraluminous X-ray Pulsars
Hong-Bo Li, Shi-Jie Gao, Xiang-Dong Li, Ren-Xin Xu
https://arxiv.org/abs/2509.13732 https…

Polar Mounds on Strangeon Stars: the Neutrino Emission from Ultraluminous X-ray Pulsars
Ultraluminous X-ray pulsars (ULXPs) serve as unique astrophysical laboratories, offering critical insights into accretion physics under extreme conditions, such as strong magnetic fields and super-Eddington accretion rates. Additionally, the nature of pulsars, i.e., the equation of state of supranuclear matter, is still a matter of intense debate, basing on either conventional neutron stars or strange stars in the litterateurs. In this work, we investigate accretion columns of ULXPs based on th…

A self-consistent numerical model of internal wave-induced mean flow oscillations in polar geometry
Florentin Daniel, Daniel Lecoanet
https://arxiv.org/abs/2509.19482 https://…

A self-consistent numerical model of internal wave-induced mean flow oscillations in polar geometry
The Earth's Quasi-Biennial Oscillation (QBO) is a natural example of wave-mean flow interaction and corresponds to the alternating directions of winds in the equatorial stratosphere. It is due to internal gravity waves (IGW) generated in the underlying convective troposphere. In stars, a similar situation is predicted to occur, with the interaction of a stably-stratified radiative zone and a convective zone. In this context, we investigate the dynamics of this reversing mean flow by modelling a…

Dipolar Nematic State in Relaxor Ferroelectrics
Yuan-Jinsheng Liu, Tyler C. Sterling, Shi Liu
https://arxiv.org/abs/2509.01464 https://arxiv.org/pdf/2509.0…

Dipolar Nematic State in Relaxor Ferroelectrics
Relaxor ferroelectrics exhibit exceptional dielectric and electromechanical properties, yet their microscopic origins remain elusive due to the interplay of hierarchical polar structures and chemical complexity. While models based on polar nanoregions or nanodomains offer valuable phenomenological insights, they often lack the first-principles predictive capability necessary for quantitatively describing functional properties such as piezoelectric coefficients. Here, we use large-scale molecula…

Stabilization of Ferroelectric Hafnia and Zirconia through Y2O3 doping
Li Yin, Cong Liu, R. E. Cohen
https://arxiv.org/abs/2509.00393 https://arxiv.org/pdf…

Stabilization of Ferroelectric Hafnia and Zirconia through Y2O3 doping
We investigate the possible stabilization of ferroelectricity in bulk Y2O3-doped hafnia and zirconia. We use density functional theory (DFT) with large random supercells of hafnia and zirconia and study the relative phase stability of the centrosymmetric cubic and monoclinic phases compared with the polar orthorhombic phase. We find that Y2O3-doping stabilizes the polar ferroelectric phase over the monoclinic baddeleyite phase in both hafnia and zirconia.

Ferroelectricity in antiferromagnetic wurtzite nitrides
Steven M. Baksa, Lin-Ding Yuan, Stephen D. Wilson, James M. Rondinelli
https://arxiv.org/abs/2509.06325 https://

Ferroelectricity in antiferromagnetic wurtzite nitrides
Wurtzite-type nitrides have recently emerged as promising candidates for ferroelectric applications, yet their magnetic counterparts remain largely unexplored. Here, we establish MnSiN$_2$ and MnGeN$_2$ as aristotypes of a new multiferroic wurtzite family that simultaneously exhibits ferroelectricity and antiferromagnetism. These Mn(II)-based nitrides crystallize in polar structures and display robust G-type antiferromagnetism at room temperature. First-principles calculations reveal that nonma…

Non-Ferroelectric to Ferroelectric Phase Transition in epitaxial Y:HfO$_2$ via Rapid Thermal Annealing Induced Nitrogen Doping
Soumyajyoti Mondal, Asraful Haque, Binoy Krishna De, Shubham Kumar Parate, Pramod Kumar Yadav, Arup Basak, Kaushal Tiwari, Bhagwati Prasad, Pavan Nukala
https://arxiv.org/abs/2509.02229

Non-Ferroelectric to Ferroelectric Phase Transition in epitaxial Y:HfO$_2$ via Rapid Thermal Annealing Induced Nitrogen Doping
Oxygen vacancies are often essential for stabilizing the orthorhombic ferroelectric phase in HfO$_2$, with cationic doping widely employed to introduce such defects. In contrast, systematic studies on anionic doping to induce ferroelectricity remain largely in nascent stages. On epitaxial Y:HfO$_2$ grown on ITO buffered YSZ substrates that crystallize in a mixed monoclinic (non-polar) and orthorhombic (polar) phases, we introduce nitrogen doping via post deposition rapid thermal annealing (RTA)…

Orbital Hybridization-Driven Stabilization and Reactivity on an Asymmetrically Reconstructed Polar CeO2(100) Surface
Songda Li, Chen Zou, Liuxi Chen, Zhong-Kang Han, Wentao Yuan, Hangsheng Yang, David J. Wales, Yong Wang
https://arxiv.org/abs/2509.11568

Orbital Hybridization-Driven Stabilization and Reactivity on an Asymmetrically Reconstructed Polar CeO2(100) Surface
Understanding and controlling the atomic structure of polar oxide surfaces is essential for unraveling surface reactivilty and designing advanced catalytic materials. Among these, the polar CeO2(100) surface is a prototypical and industrially important system in heterogeneous catalysis. However, due to the vast complexity of the surface configurations, its reconstruction behavior remains an open question. Here, we report a previously unidentified asymmetric (1x2) reconstructed structure on the …

Phonon studies of the phase transition sequence in antiferroelectric single crystal of Pb(Hf0.83Sn0.17)O3
Anirudh K. R., Cosme Milesi-Brault, Christelle Kadlec, Dmitry Nuzhnyy, Andrzej Majchrowski, Magdalena Krupska-Klimczak, Irena Jankowska-Sumara, Elena Buixaderas
https://arxiv.org/abs/2508.16472…

Phonon studies of the phase transition sequence in antiferroelectric single crystal of Pb(Hf0.83Sn0.17)O3
The sequence of phase transitions in PbHf0.83Sn0.17O3 has been studied by THz, far infrared and Raman spectroscopies, revealing the complementary behaviour of both, polar and non-polar phonons and their impact on the transition lattice dynamics. Pb atom is sensitive to all phase transitions, changing its dynamics with temperature. As temperature decreases, the crystal undergoes a sequence of three phase transitions. The first one to an intermediate (IM) phase, in which polar fluctuations are de…

Control of polarization and polar chiral textures in BiFeO$_3$ by epitaxial strain and interfacial chemistry
Elzbieta Gradauskaite, Natascha Gray, Quintin N. Meier, Marta D. Rossell, Morgan Trassin
https://arxiv.org/abs/2508.20930

Control of polarization and polar chiral textures in BiFeO$_3$ by epitaxial strain and interfacial chemistry
The balance between interfacial chemistry, electrostatics, and epitaxial strain plays a crucial role in stabilizing polarization in ferroelectric thin films. Here, we bring these contributions into competition in BiFeO$_3$ (BFO) thin films grown on the charged-surface-terminated La$_{0.7}$Sr$_{0.3}$MnO$_3$ (LSMO)-buffered NdGaO$_3$ (001) substrates. The large anisotropic compressive strain from the substrate promotes the formation of ferroelectric domains despite the expected stabilization of a…

Controlled growth of polar altermagnets via chemical vapor transport
Hiraka Haruhiro, Raktim Datta, Poonam Yadav, Anzar Ali, Suheon Lee, Matthias J. Gutmann, Duhee Yoon, Dirk Wulferding, Xianghan Xu, Moon-Ho Jo, Sang-Wook Cheong, Sungkyun Choi
https://arxiv.org/abs/2509.11716

Controlled growth of polar altermagnets via chemical vapor transport
Altermagnetic properties have been recently proposed in polar magnetic oxides, M$_{2}$Mo$_{3}$O$_{8}$ (M = Mn, Fe, Co, Ni), where improved characteristics of stronger magnetoelectric coupling and higher magnetic transition temperatures were observed. Thus, understanding their microscopic origins is of fundamental and technological importance. However, the difficulty in growing large single crystals hinders detailed experimental studies. Here, we report the successful growth of large single crys…

Sliding multiferroicity in hexagonal stacked CrI3
Carter Fox, Jose D. Mella, Jack Rollins, Yangchen He, Yulu Mao, Haotian Jiang, Alaina Drew, Hongrui Ma, Takashi Taniguchi, Kenji Watanabe, Ying Wang, Daniel Rhodes, Salvador Barraza-Lopez, Jun Xiao
https://arxiv.org/abs/2510.03220

Sliding multiferroicity in hexagonal stacked CrI3
Developing new multiferroics at the two-dimensional (2D) limit with energy-efficient magnetoelectric coupling can inform the interplay physics of novel orders and advance on-chip high-performance computing applications. Here we apply stacking order engineering to create a new type of 2D multiferroics, namely sliding multiferroics, based on polar hexagonal stacked (H-stacked) CrI3. This new stacking order removes structural inversion symmetry and gives rise to room temperature sliding ferroelect…