Tootfinder

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.

We’re proud to support Polar Connect Step 2 (24-EU-DIG-PC2) as an Associated Partner, working alongside the Swedish Polar Research Secretariat, NORDUnet, GlobalConnect, CSC, and the Swedish Research Council (the project coordinator).
With the Grant Agreement now signed, PC2 takes a major step toward realising Polar Connect – a resilient Arctic submarine cable system linking Europe, North America, and East Asia for the benefit of the global internet.
🔗 Read more:

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…

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…

❄️ It’s freezing cold outside here in Germany, and this is an interesting explainer of why that is: a warming event in the polar region is leading to an early collapse of the polar vortex, so Europe and North America are flooded with cold air, while the North Pole is unusually warm. #weather #climate

Stratospheric Warming Watch: Polar Vortex Collapse has begun, with cold air and snowfall impacts expected
A Stratospheric Warming is now collapsing the Polar Vortex, with polar air and snow forecast across the United States, Canada and Europe in December

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 …

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…

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 $NO^+(6,2)$.

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

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…

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…

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.

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…

☯️ 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."

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 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 $\dot{P}=6.65\pm0.81\times10^{-11}$.

Blueberry species (genus Vaccinium) circled the Northern Hemisphere to travel from North America to Hawai'i— and then closed the loop to hybridize with a North American species
#science

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…

"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

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…

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.

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.

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/

"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
.

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…

🇺🇦 #NowPlaying on BBCRadio3's #CarolsAcrossTheCountryASeasonalJourney
Alan Silvestri & Alan Silvestri:
🎵 The Polar Express (Suite)
#AlanSilvestri
https://open.spotify.com/track/3mfEv2KipK7lVWwocNx46Y

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…

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…

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.

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…

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…

Generation of strong ultralow-phase-noise microwave fields with tunable ellipticity for ultracold polar molecules
Shrestha Biswas, Sebastian Eppelt, Christian Buchberger, Xing-Yan Chen, Andreas Schindewolf, Michael Hani, Erwin Biebl, Immanuel Bloch, Xin-Yu Luo
https://arxiv.org/abs/2512.03007

Soon polar night. So here's a photo of the aurora Borealis

@… @… turns out polar bears can’t shoot the threes…

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 …

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

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…

Quadrupole perturbations of slowly spinning Ellis-Bronnikov wormholes
Bahareh Azad, Jose Luis Bl\'azquez-Salcedo, Fech Scen Khoo, Jutta Kunz, Francisco Navarro-L\'erida
https://arxiv.org/abs/2509.22118

Quadrupole perturbations of slowly spinning Ellis-Bronnikov wormholes
We study the axial and polar perturbations of slowly rotating Ellis-Bronnikov wormholes in General Relativity, applying a perturbative double expansion. In particular, we derive the equations for $l=2$, $M_z=2$ perturbations of these objects which are parametrized by an asymmetry parameter. The equations constitute an astrophysically interesting sector of the perturbations that contribute dominantly to the gravitational wave radiation. Moreover, calculation of these modes may exhibit potential …

Approximating value functions via corner Benders' cuts
Matheus Jun Ota, Ricardo Fukasawa, Aleksandr M. Kazachkov
https://arxiv.org/abs/2509.21758 https://

Approximating value functions via corner Benders' cuts
We introduce a novel technique to generate Benders' cuts from a conic relaxation ("corner") derived from a basis of a higher-dimensional polyhedron that we aim to outer approximate in a lower-dimensional space. To generate facet-defining inequalities for the epigraph associated to this corner, we develop a computationally-efficient algorithm based on a compact reverse polar formulation and a row generation scheme that handles the redundant inequalities. Via a known connection between arc-flow a…

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

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…

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 …

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.

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/

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…

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…

From spinning sea ice floes to ocean enstrophy spectra in the Marginal Ice Zone
Minki Kim, Georgy E. Manucharyan, Michelle H. DiBenedetto, Ellen M. Buckley, Daniel M. Watkins, Monica M. Wilhelmus
https://arxiv.org/abs/2509.21333

From spinning sea ice floes to ocean enstrophy spectra in the Marginal Ice Zone
Quantifying kinetic energy (KE) and enstrophy transfer, mixing, and dissipation in the Arctic Ocean is key to understanding polar ocean dynamics, which are critical components of the global climate system. However, in ice-covered regions, limited eddy-resolving observations challenge characterizing KE and enstrophy transfer across scales. Here, we use satellite-derived sea ice floe rotation rates to infer the surface ocean enstrophy spectra in the marginal ice zone. Employing a coarse-graining …

$(m, \psi, \delta)-$capacity and its properties
Kobiljon Kuldoshev
https://arxiv.org/abs/2509.22440 https://arxiv.org/pdf/2509.22440

$(m, ψ, δ)-$capacity and its properties
In this paper, we introduce the concept of the generalized $(m, ψ, δ)-$capacity in the complex space $\mathbb{C}^n$, within the class of $m-$subharmonic functions. We give a relation between $(m, ψ, δ)-$capacity and $(m, ψ, δ)-$subharmonic measure. Moreover, we prove that the capacity vanishes on $m-$polar sets and vice versa.

Replaced article(s) found for physics.comp-ph. https://arxiv.org/list/physics.comp-ph/new
[1/1]:
- Discretization form of the continuity condition at the polar axis, with application to the gyroki...
Tiannan Wu, Zihao Wang, Shaojie Wang

Crystal Orientation Dependence of Extreme Near-Field Heat Transfer between Polar Materials Governed by Surface Phonon Modes
Wei-Zhe Yuan, Yangyu Guo, Hong-Liang Yi
https://arxiv.org/abs/2509.13837

Crystal Orientation Dependence of Extreme Near-Field Heat Transfer between Polar Materials Governed by Surface Phonon Modes
Due to the rapid development of micro- and nano-manufacturing and electronic devices, heat transfer at the transition regime between radiation and conduction becomes increasingly important. Recent work has demonstrated the importance of nonlocal optical response and phonon tunneling. However, it remains unclear how the crystal orientation impacts them. In this work, we study this effect on heat transport across vacuum gaps between magnesium oxide (MgO) by nonequilibrium molecular dynamics (NEMD…

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…

Crosslisted article(s) found for cond-mat.quant-gas. https://arxiv.org/list/cond-mat.quant-gas/new
[1/1]:
- Observation of resonant monopole-dipole energy transfer between Rydberg atoms and polar molecules
J. Zou, R. R. W. Wang, R. Gonz\'alez-F\'erez, H. R. Sade…

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

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…

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 (…

"Antarctic mountains could boost ocean carbon absorption as ice sheets thin"
#Antarctic #Oceans
https://

Antarctic mountains could boost ocean carbon absorption as ice sheets thin
Research led by polar scientists from Northumbria University has revealed new hope in natural environmental systems found in East Antarctica which could help mitigate the overall rise of carbon dioxide in the atmosphere over long timescales.

Me entering the lake for a swim #Uckermark #coldswim

Crosslisted article(s) found for physics.flu-dyn. https://arxiv.org/list/physics.flu-dyn/new
[1/1]:
- A self-consistent numerical model of internal wave-induced mean flow oscillations in polar geometry
Florentin Daniel, Daniel Lecoanet

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…

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/

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…

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…

A Multidimensional Self-Adaptive Numerical Simulation Framework for Semiconductor Boltzmann Transport Equation
Zeyu Zhang, Xiaoyu Zhang, Zhigang Song, Qing Fang
https://arxiv.org/abs/2509.15879

A Multidimensional Self-Adaptive Numerical Simulation Framework for Semiconductor Boltzmann Transport Equation
This research addresses the numerical simulation of the Boltzmann transport equation for semiconductor devices by proposing a multidimensional self-adaptive numerical simulation framework. This framework is applied to two important generalized forms of the equation: a parabolic equation with singular properties on the unit disk and a continuity equation. The study enhances the alignment of numerical simulations with physical characteristics through polar coordinate transformation and variable d…

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

Cumulative proton production in $pd$ collisions
A. B. Larionov
https://arxiv.org/abs/2509.22433 https://arxiv.org/pdf/2509.22433

Cumulative proton production in $pd$ collisions
The model of backward proton production in the exclusive reaction $pd \to ppn$ at proton beam momenta up to several GeV/c is constructed on the basis of Feynman diagrams for one- and two-step amplitudes. The latter include nucleon and $Δ(1232)$ resonance intermediate scattering states with propagators reduced to eikonal form using the generalized eikonal approximation. The model calculations are compared with available experimental data on the energy spectra of protons at backward polar angles…

Conifold gap and all-genus mirror symmetry for local $\mathbb{P}^2$
Andrea Brini
https://arxiv.org/abs/2509.19298 https://arxiv.org/pdf/2509.19298

Observation of resonant monopole-dipole energy transfer between Rydberg atoms and polar molecules
J. Zou, R. R. W. Wang, R. Gonz\'alez-F\'erez, H. R. Sadeghpour, S. D. Hogan
https://arxiv.org/abs/2509.21582

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…

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…

Effect of correlation on the elastic scattering of slow positrons from molecules
Snigdha Sharma, Dhanoj Gupta
https://arxiv.org/abs/2509.15670 https://arxi…

Effect of correlation on the elastic scattering of slow positrons from molecules
Many-body correlation plays a crucial role in the low-energy positron-molecule scattering dynamics. In the present work, we have integrated a recent model correlation potential, developed by Swann and Gribakin, with the single-center expansion method and verified its efficacy in reproducing the best of ab initio and experimental results, for both non-polar and polar molecules. Starting with the already tested molecules-hydrogen, ethylene, and acetylene with the model correlation, we extended ou…

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…

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…

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…

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…

Non-Newtonian viscous fluid models with learned rheology accurately reproduce Lagrangian sea ice simulations
Gonzalo G. de Diego, Georg Stalder
https://arxiv.org/abs/2509.16426 …

Non-Newtonian viscous fluid models with learned rheology accurately reproduce Lagrangian sea ice simulations
Polar sea ice is crucial to Earth's climate system. Its dynamics also affect coastal communities, wildlife, and global shipping. Sea ice is typically modeled as a continuum fluid using a model proposed almost 50 years, which is moderately accurate for packed ice, but loses its predictive accuracy outside of the central ice pack. Discrete element methods (DEMs) offer an alternative by resolving the behavior of individual ice floes, including collisions, frictional contact, fracture, and ridging.…

The Polar Orbit of TOI-2374 b, a Planet in the Neptunian Ridge
Samuel W. Yee, Patrick Tamburo, Gudmundur Stef\'ansson, Juliana Garc\'ia-Mej\'ia, David Charbonneau, Khalid Barkaoui, Karen A. Collins, Richard P. Schwarz, Norio Narita, Akihiko Fukui, Andrew W. Howard, Howard Isaacson, Benjamin J. Fulton, Fei Dai
https://arxiv.org/…

The Polar Orbit of TOI-2374 b, a Planet in the Neptunian Ridge
The ``Neptunian ridge'' is a recently identified peak in the frequency of planets with sizes between that of Neptune and Saturn orbiting their host stars with periods between 3 and 6 days (A. Castro-González et al. 2024). These planets may have formed similarly to their larger, hot Jupiter counterparts in the ``three-day pile-up'', through a dynamically excited migration pathway. The distribution of stellar obliquities in hot Neptune systems may therefore provide a vital clue as to their origi…

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…

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

Exploring molecular supersolidity via exact and mean-field theories: single microwave shielding
Tiziano Arnone Cardinale, Thomas Bland, Stephanie M. Reimann
https://arxiv.org/abs/2509.18051

Exploring molecular supersolidity via exact and mean-field theories: single microwave shielding
Ultracold polar molecules with microwave shielding provide a powerful platform for exploring quantum many-body physics with strong, anisotropic interactions. We develop an extended Gross-Pitaevskii framework for bosonic molecules under single microwave shielding, incorporating effective interactions and quantum fluctuations, and benchmark it against exact Quantum Monte Carlo simulations. In the regime of positive scattering lengths, our approach captures superfluid, supersolid, and droplet phas…

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…

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 …

Quasinormal modes and tidal Love numbers of covariant effective quantum black holes with cosmological constant
Yunlong Liu, Xiangdong Zhang
https://arxiv.org/abs/2509.12013 http…

Quasinormal modes and tidal Love numbers of covariant effective quantum black holes with cosmological constant
This paper systematically investigates the quasinormal modes (QNMs) and tidal Love numbers of covariant quantum-modified black holes (BHs) within two cosmological constant-dependent metric frameworks. By deriving axial/polar perturbation equations and employing pseudospectral methods (for QNMs) and numerical integration (for Love numbers), we quantify the quantum parameter $ζ$'s influence. We find that, higher overtones exhibit enhanced $ζ$ sensitivity. Solution 1 maintains purely imaginary Q…

Improved reconstruction of the century-long solar magnetic field by incorporating morphological asymmetry in sunspots
Subhadip Pal, Gopal Hazra, Sudip Mandal
https://arxiv.org/abs/2509.23691

Improved reconstruction of the century-long solar magnetic field by incorporating morphological asymmetry in sunspots
Accurately modeling the solar magnetic field is important for understanding long-term solar activity and space weather, but it is challenging due to limited observations, especially near the poles. The Surface Flux Transport (SFT) model simulates how magnetic flux moves across the solar surface and contributes to the polar field, but it parametrizes emerged sunspots as simple symmetric bipolar regions and needs improvement by including more realistic sunspot features. In this study, we reconstr…

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…

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…

Dynamical Pathways to the Misalignment of the VHS 1256-1257 System
Liz Holzknecht, Smadar Naoz, Cheyanne Shariat
https://arxiv.org/abs/2509.21452 https://a…

Dynamical Pathways to the Misalignment of the VHS 1256-1257 System
Circumbinary planets (CBPs) provide a unique window into planet formation and dynamical evolution in complex gravitational environments. Their orbits are shaped not only by the protoplanetary disk but also by the perturbations from two stellar hosts, making them sensitive probes of both early- and late-stage dynamical processes. In this work, we investigate the unusual architecture of the VHS J125601.92-125723.9 system, where a retrograde, nearly polar tertiary orbits an extremely low-mass subs…

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…

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…

Response time of electrons to light in strong-field ionization of polar molecules
Jiayin Che, Sheng Ye, Shiqi Shen, Weiyan Li, Yanjun Chen
https://arxiv.org/abs/2511.12087 https…

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.

Metastable helium in the thermosphere
S. R. Kulkarni
https://arxiv.org/abs/2509.14499 https://arxiv.org/pdf/2509.14499

Metastable helium in the thermosphere
SPHEREx, a recently launched astronomy mission, detected a bright 1.083 micron emission feature in the commissioning data. The PI group attributed this feature to the He I 1.0833 micron triplet line. Here, I review the physics and aeronomy of this well-known line of atmospheric origin. SPHEREx is in a dawn-dusk sun-synchronous polar orbit, circling the earth nearly 15 times a day and observing close to the terminator plane. With a height of 650 km, SPHEREx is located in the upper thermosphere t…

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…

Tuning Coupled Toroidic and Polar Orders in a Bilayer Antiferromagnet
Chuangtang Wang, Xiaoyu Guo, Zixin Zhai, Meixin Cheng, Sang-Wook Cheong, Adam W. Tsen, Bing Lv, Liuyan Zhao
https://arxiv.org/abs/2509.13542

Tuning Coupled Toroidic and Polar Orders in a Bilayer Antiferromagnet
Magnetic toroidal order features a loop-like arrangement of magnetic dipole moments, thus breaking both spatial inversion (P) and time-reversal (T) symmetries while preserving their combined PT sym-metry. This PT symmetry enables a linear magnetoelectric effect, allowing the coupling between magnetic toroidicity and electric polarity. However, the detection and control of two-dimensional (2D) magnetic toroidal order and the investigation of its linear magnetoelectric response remain largely une…

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…

Topology-Driven Vibrations in a Chiral Polar Vortex Lattice
Eric R. Hoglund, Harrison A. Walker, Peter Meisenheimer, Thomas W. Pfeifer, Niels De Vries, Dipanjan Chaudhuri, Ting-Ran Liu, Steven C. Quillin, Sandhya Susarla, De-Liang Bao, Patrick E. Hopkins, Andrew R. Lupini, Peter Abbamonte, Yu-Tsun Shao Ramamoorthy Ramesh, Sokrates T. Pantelides, Jordan A. Hachtel

Topology-Driven Vibrations in a Chiral Polar Vortex Lattice
The ordering of magnetic or electric dipoles leading to real-space topological structures is at the forefront of materials research as their quantum mechanical nature often lends itself to emergent properties. Atomic lattice vibrations (phonons) are often a key contributor to the formation of long-range dipole textures based on ferroelectrics and impact the properties of the emergent phases. Here, using monochromated, momentum-resolved electron energy-loss spectroscopy (qEELS) with nanometer sp…

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Probing Solar Polar Regions
Yuanyong Deng, et al.
https://…

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…

Proximity Ferroelectricity in Compositionally Graded Structures
Eugene A. Eliseev, Anna N. Morozovska, Sergei V. Kalinin, Long-Qing Chen, Venkatraman Gopalan
https://arxiv.org/abs/2509.13443

Proximity Ferroelectricity in Compositionally Graded Structures
Proximity ferroelectricity is a novel paradigm for inducing ferroelectricity in a non-ferroelectric polar material such as AlN or ZnO that are typically unswitchable with an external field below their dielectric breakdown field. When placed in direct contact with a thin switchable ferroelectric layer (such as Al1-xScxN or Zn1-xMgxO), they become a practically switchable ferroelectric. Using the thermodynamic Landau-Ginzburg-Devonshire theory, in this work we performed the finite element modelin…

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…