Tootfinder

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…

Role of long-range dipolar interactions in the simulation of the properties of polar crystals using effective atomic potentials
Miao Yu, Fernando G\'omez-Ortiz, Louis Bastogne, Jin-Zhu Zhao, Philippe Ghosez
https://arxiv.org/abs/2506.22337

Role of long-range dipolar interactions in the simulation of the properties of polar crystals using effective atomic potentials
Driven by novel approaches and computational techniques, second-principles atomic potentials are nowadays at the forefront of computational materials science, enabling large-scale simulations of material properties with near-first-principles accuracy. However, their application to polar materials can be challenging, particularly when longitudinal-optical phonon modes are active on the material, as accurately modeling such systems requires incorporating the long-range part of the dipole-dipole i…

In which Banach spaces is the polar of every convex cone convex
A. B. N\'emeth
https://arxiv.org/abs/2507.22739 https://arxiv.org/pdf/2507.22739…

In which Banach spaces is the polar of every convex cone convex
Using the notion of the normalized duality map it is characterized the class of the uniformly convex uniformly smooth Banach spaces in which each convex cone has a convex polar.

Polar Coding and Linear Decoding
Geraldo A. Barbosa
https://arxiv.org/abs/2507.19695 https://arxiv.org/pdf/2507.19695…

Polar Coding and Linear Decoding
Polar encoding, described by Arikan in IEEE Transactions on Information Theory, Vol. 55, No. 7, July 2009, was a milestone for telecommunications. A Polar code distributes information among high and low-capacity channels, showing the possibility of achieving perfect channel capacity. The high-capacity channels allow almost noiseless transmission of data. When these channels are not high noise, reliability is achieved in the signal transmission. It starts to compete against codes such a Low-Dens…

Controlling Topological Defects in Polar Fluids via Reinforcement Learning
Abhinav Singh, Petros Koumoutsakos
https://arxiv.org/abs/2507.19298 https://arxi…

Controlling Topological Defects in Polar Fluids via Reinforcement Learning
Topological defects in active polar fluids exhibit complex dynamics driven by internally generated stresses, reflecting the deep interplay between topology, flow, and non-equilibrium hydrodynamics. Feedback control offers a powerful means to guide such systems, enabling transitions between dynamic states. We investigated closed-loop steering of integer-charged defects in a confined active fluid by modulating the spatial profile of activity. Using a continuum hydrodynamic model, we show that loc…

The long-term stability of the Vast Polar Structure and its connection to a possible previous passage of the LMC
Alberto Manuel Mart\'inez-Garc\'ia, Andr\'es del Pino
https://arxiv.org/abs/2507.18685

The long-term stability of the Vast Polar Structure and its connection to a possible previous passage of the LMC
The Vast Polar Structure (VPOS) is a thin, planar arrangement of co-orbiting dwarf galaxies, nearly perpendicular to the Milky Way (MW) disc. In this work we investigate the persistence and stability of the VPOS over time. We identify VPOS member galaxies and integrate their orbits over the past 5 Gyr using time evolving gravitational potentials that account for the mutual interaction between the MW and the Large Magellanic Cloud (LMC). The reconstructed trajectories allow us to examine the lon…

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…

Probing Solar Polar Regions
Yuanyong Deng, Hui Tian, Jie Jiang, Shuhong Yang, Hao Li, Robert Cameron, Laurent Gizon, Louise Harra, Robert F. Wimmer-Schweingruber, Fr\'ed\'eric Auch\`ere, Xianyong Bai, Luis Bellot Rubio, Linjie Chen, Pengfei Chen, Lakshmi Pradeep Chitta, Jackie Davies, Fabio Favata, Li Feng, Xueshang Feng, Weiqun Gan, Don Hassler, Jiansen He, Junfeng Hou, Zhenyong Hou, Chunlan Jin, Wenya Li, Jiaben Lin, Dibyendu Nandy, Vaibhav Pant, Marco Romoli, Taro Sakao, Kri…

Probing Solar Polar Regions
The magnetic fields and dynamical processes in the solar polar regions play a crucial role in the solar magnetic cycle and in supplying mass and energy to the fast solar wind, ultimately being vital in controlling solar activities and driving space weather. Despite numerous efforts to explore these regions, to date no imaging observations of the Sun's poles have been achieved from vantage points out of the ecliptic plane, leaving their behavior and evolution poorly understood. This observation …

Bose-Einstein condensate of ultracold sodium-rubidium molecules with tunable dipolar interactions
Zhaopeng Shi, Zerong Huang, Fulin Deng, Wei-Jian Jin, Su Yi, Tao Shi, Dajun Wang
https://arxiv.org/abs/2508.20518

Bose-Einstein condensate of ultracold sodium-rubidium molecules with tunable dipolar interactions
Realizing Bose-Einstein condensation of polar molecules is a long-standing challenge in ultracold physics and quantum science due to near-universal two-body collisional losses. Here, we report the production of a Bose-Einstein condensate of ground-state sodium-rubidium molecules via high efficiency evaporative cooling, with losses suppressed using the dual microwave shielding technique. The ability to tune the dipolar interaction between these ultracold polar molecules is crucial for producing …

Paris goal of 1.5°C warming is still too hot for polar ice sheets, study warns https://news.mongabay.com/short-article/2025/06/paris-goal-of-1-5c-warming-is-still-too-hot-for-polar-ice-sheets-study-warns/

Paris goal of 1.5°C warming is still too hot for polar ice sheets, study warns
At the landmark Paris climate agreement, nearly every country in the world pledged to a goal to limit warming to well below 2° Celsius (3.6° Fahrenheit) above preindustrial levels by 2100, and work toward a more ambitious goal to limit warming to 1.5°C (2.7°F). The hope is that such a limit will help Earth avoid […]

Polar solitons in a nonpolar chiral soft matter system
Jiahao Chen, Xingzhou Tang, Yang Ding, Susanta Chakraborty, Satoshi Aya, Bingxiang Li, Yanqing Lu
https://arxiv.org/abs/2506.16778

Polar solitons in a nonpolar chiral soft matter system
Polar solitons, i.e., solitonic waves accompanying asymmetry of geometry or phase, have garnered attention in polar systems, such as ferroelectric or magnetoelectric materials, where they play a critical role in topological transitions and nonreciprocal responses to external fields. A key question is whether such polar solitons can emerge in nonpolar systems, where intrinsic polarity is absent. Here, we demonstrate an unprecedented polar soliton with nematic order in a nonpolar and chiral liqui…

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…

POLAR: A Pessimistic Model-based Policy Learning Algorithm for Dynamic Treatment Regimes
Ruijia Zhang, Zhengling Qi, Yue Wu, Xiangyu Zhang, Yanxun Xu
https://arxiv.org/abs/2506.20406

POLAR: A Pessimistic Model-based Policy Learning Algorithm for Dynamic Treatment Regimes
Dynamic treatment regimes (DTRs) provide a principled framework for optimizing sequential decision-making in domains where decisions must adapt over time in response to individual trajectories, such as healthcare, education, and digital interventions. However, existing statistical methods often rely on strong positivity assumptions and lack robustness under partial data coverage, while offline reinforcement learning approaches typically focus on average training performance, lack statistical gu…

Matrix convex sets over the Euclidean ball and polar duals of real free spectrahedra
Eric Evert, Benjamin Passer
https://arxiv.org/abs/2507.20325 https://a…

Matrix convex sets over the Euclidean ball and polar duals of real free spectrahedra
We show that the free spectrahedron determined by universal anticommuting self-adjoint unitaries is not equal to the minimal matrix convex set over the ball in dimension three or higher. This example, as well as other matrix convex sets over the ball, then provides context for structure results on the extreme points of coordinate projections. In particular, we show that the free polar dual of a real free spectrahedron is rarely the projection of a real free spectrahedron, contrasting a prior re…

"Paris goal of 1.5°C warming is still too hot for polar ice sheets, study warns"
#ParisAgreement #Climate #ClimateChange

Paris goal of 1.5°C warming is still too hot for polar ice sheets, study warns
At the landmark Paris climate agreement, nearly every country in the world pledged to a goal to limit warming to well below 2° Celsius (3.6° Fahrenheit) above preindustrial levels by 2100, and work toward a more ambitious goal to limit warming to 1.5°C (2.7°F). The hope is that such a limit will help Earth avoid […]

Liberals often struggle against populist narratives because the polar opposite of populism is elitism,
-- which carries much less appeal.
Here are some of the narratives that work to create the software of autocracy
https://www.politico.com/news/magazine/202

1D Vlasov Simulations of QED Cascades Over Pulsar Polar Caps
Dingyi Ye, Alexander Y. Chen
https://arxiv.org/abs/2507.15804 https://ar…

1D Vlasov Simulations of QED Cascades Over Pulsar Polar Caps
Recent developments in the study of pulsar radio emission revealed that the microphysics of quantum electrodynamic (QED) pair cascades at pulsar polar caps may be responsible for generating the observed coherent radio waves. However, modeling the pair cascades in the polar cap region poses significant challenges, particularly under conditions of high plasma multiplicity. Traditional Particle-in-Cell (PIC) methods often face rapidly increasing computational costs as the multiplicity grows expone…

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…

Former NFL TE Jimmy Graham breaks Arctic rowing record, makes history with polar ocean crossing

https://www.cbssports.com/nfl/news/former-

Three-step growth of vapor-deposited ice under mesospheric temperature and water vapor conditions
Reo Sato, Kentaro Noguchi, Hiroyuki Koshida, Atsuki Ishibashi, Tetsuya Hama
https://arxiv.org/abs/2507.18477

Three-step growth of vapor-deposited ice under mesospheric temperature and water vapor conditions
Polar mesospheric clouds provide clues to physicochemical processes in the mesosphere and lower thermosphere. However, the heterogeneous nucleation and growth processes of water ice under polar mesospheric conditions are poorly understood, especially at the nanoscale. This study used reflection high energy electron diffraction and infrared reflection absorption spectroscopy to analyze the structure of vapor-deposited ice at polar mesospheric temperature (120 K) under vapor pressure conditions. …

Performance Analysis of Spatiotemporal 2-D Polar Codes for Massive MIMO with MMSE Receivers
Yaqi Li, Xiaohu You, Jiamin Li, Chen Ji, Bin Sheng
https://arxiv.org/abs/2507.19986 h…

Performance Analysis of Spatiotemporal 2-D Polar Codes for Massive MIMO with MMSE Receivers
With the evolution from 5G to 6G, ultra-reliable low-latency communication (URLLC) faces increasingly stringent performance requirements. Lower latency constraints demand shorter channel coding lengths, which can severely degrade decoding performance. The massive multiple-input multiple-output (MIMO) system is considered a crucial technology to address this challenge due to its abundant spatial degrees of freedom (DoF). While polar codes are theoretically capacity-achieving in the limit of infi…

What exactly is 'active matter'?
Michael te Vrugt, Benno Liebchen, Michael E. Cates
https://arxiv.org/abs/2507.21621 https://arxiv.org/pdf/2507.216…

What exactly is 'active matter'?
As the study of active matter has developed into one of the most rapidly growing subfields of condensed matter physics, more and more kinds of physical systems have been included in this framework. While the word 'active' is often thought of as referring to self-propelled particles, it is also applied to a large variety of other systems such as non-polar active nematics or certain particles with non-reciprocal interactions. Developing novel forms of active matter, as attempted, e.g., in the fra…

Latent-attention Based Transformer for Near ML Polar Decoding in Short-code Regime
Hongzhi Zhu, Wei Xu, Xiaohu You
https://arxiv.org/abs/2507.14951 https:/…

Latent-attention Based Transformer for Near ML Polar Decoding in Short-code Regime
Transformer architectures have emerged as promising deep learning (DL) tools for modeling complex sequence-to-sequence interactions in channel decoding. However, current transformer-based decoders for error correction codes (ECCs) demonstrate inferior performance and generalization capabilities compared to conventional algebraic decoders, especially in short-code regimes. In this work, we propose a novel latent-attention based transformer (LAT) decoder for polar codes that addresses the limitat…

Near-field focusing and amplification of tip-substrate radiative heat transfer
Milo Vescovo, Philippe Ben-Abdallah, Riccardo Messina
https://arxiv.org/abs/2507.20760 https://

Near-field focusing and amplification of tip-substrate radiative heat transfer
The spatially resolved near-field radiative heat transfer between a nanoscale probe and a substrate is studied in the fluctuational electrodynamics framework within the dipolar approximation. It is shown that the introduction of a thin polar film atop a non-dispersive substrate can lead to both an enhancement and a lateral focusing of the heat exchange. The influence of the probe--substrate separation, film thickness and substrate permittivity is analyzed, revealing that the effect originates f…

Hexagonal 3-webs of circles with polar twisted cubic
Sergey I. Agafonov
https://arxiv.org/abs/2507.12139 https://arxiv.org/pdf/2507.1…

Hexagonal 3-webs of circles with polar twisted cubic
The paper describes and classifies hexagonal circular 3-webs on unit sphere such that the polar points of the web circles lie on a twisted cubic, thus completing classification of hexagonal circular 3-webs with algebraic polar curves of degree three.

GATOS. n. On the physical origin of the extended MIR emission in AGN
Enrique Lopez-Rodriguez, Cristina Ramos Almeida, Miguel Pereira-Santaella, Ismael Garc\'ia-Bernete, Robert Nikutta, Almudena Alonso-Herrero, Enrica Bellocchi, Andrew Bunker, Steph Campbell, Fran\c{c}oise Combes, Richard Davies, Tanio Diaz-Santos, Lindsay Fuller, Poshak Gandhi, Santiago Garc\'ia-Burillo, Omaira Gonz\'alez-Mart\'in, Erin K. S. Hicks, Sebastian H\"onig, Kohei Ichikawa, Masatoshi Iman…

GATOS. n. On the physical origin of the extended MIR emission in AGN
The polar mid-infrared (MIR) emission detected from tens to hundreds of parsecs in some active galactic nuclei (AGN) has been associated with dusty winds driven away by radiation pressure. However, the physical characterization of this extended polar emission remains uncertain. Here we combine $10-21μ$m JWST/MIRI imaging observations with $7-25 μ$m MRS integral field spectroscopic observations of 6 nearby, $\bar{D}=35.4\pm4.6$~Mpc, AGN from the GATOS Survey to quantify the nature of the exten…

Character sheaves on loop Lie algebras: polar partition
Ngo Bao Chau, Zhiwei Yun
https://arxiv.org/abs/2506.14584 https://arxiv.org/p…

Character sheaves on loop Lie algebras: polar partition
In this paper we propose a partition of loop Lie algebras into invariant sets parametrized by polar data. Our polar partition is motivated by J-K. Yu's construction of supercuspidal representations and leads to a conjectural construction of character sheaves on loop Lie algebras.

Nonequilibrium quench dynamics of Bose-Einstein condensates of microwave-shielded polar molecules
Abdelaali Boudjemaa
https://arxiv.org/abs/2506.20835 http…

Nonequilibrium quench dynamics of Bose-Einstein condensates of microwave-shielded polar molecules
We theoretically investigate the non-equilibrium dynamics of homogeneous ultracold Bose gases of microwave-shielded polar molecules following a sudden quench of the scattering length at zero temperature. We calculate in particular the quantum depletion, the anomalous density, the condensate fluctuations, and the pair correlation function using both the time-dependent Bogoliubov approach and the self-consistent time-dependent Hartree-Fock-Bogoliubov approximation. During their time evolution, th…

Thermodynamically driven tilt grain boundaries of monolayer crystals using catalytic liquid alloys
Min-Yeong Choi, Chang-Won Choi, Dong-Yeong Kim, Moon-Ho Jo, Yong-Sung Kim, Si-Young Choi, Cheol-Joo Kim
https://arxiv.org/abs/2507.22689

Thermodynamically driven tilt grain boundaries of monolayer crystals using catalytic liquid alloys
We report a method to precisely control the atomic defects at grain boundaries (GBs) of monolayer MoS2 by vapor-liquid-solid (VLS) growth using sodium molybdate liquid alloys, which serve as growth catalysts to guide the formations of the thermodynamically most stable GB structure. The Mo-rich chemical environment of the alloys results in Mo-polar 5|7 defects with a yield exceeding 95%. The photoluminescence (PL) intensity of VLS-grown polycrystalline MoS2 films markedly exceeds that of th…

Topological Social Choice: Designing a Noise-Robust Polar Distance for Persistence Diagrams
Athanasios Andrikopoulos, Nikolaos Sampanis
https://arxiv.org/abs/2507.14340

Topological Social Choice: Designing a Noise-Robust Polar Distance for Persistence Diagrams
Topological Data Analysis (TDA) has emerged as a powerful framework for extracting robust and interpretable features from noisy high-dimensional data. In the context of Social Choice Theory, where preference profiles and collective decisions are geometrically rich yet sensitive to perturbations, TDA remains largely unexplored. This work introduces a novel conceptual bridge between these domains by proposing a new metric framework for persistence diagrams tailored to noisy preference data.We def…

DocPolarBERT: A Pre-trained Model for Document Understanding with Relative Polar Coordinate Encoding of Layout Structures
Benno Uthayasooriyar, Antoine Ly, Franck Vermet, Caio Corro
https://arxiv.org/abs/2507.08606

DocPolarBERT: A Pre-trained Model for Document Understanding with Relative Polar Coordinate Encoding of Layout Structures
We introduce DocPolarBERT, a layout-aware BERT model for document understanding that eliminates the need for absolute 2D positional embeddings. We extend self-attention to take into account text block positions in relative polar coordinate system rather than the Cartesian one. Despite being pre-trained on a dataset more than six times smaller than the widely used IIT-CDIP corpus, DocPolarBERT achieves state-of-the-art results. These results demonstrate that a carefully designed attention mechan…

Liberals often struggle against these populist narratives because the polar opposite of populism is elitism, which carries much less appeal. Here are some of the narratives that work to create the software of autocracy.
— The Folksy Outsider. Pushing against the boundaries of written and unwritten norms is a standard performative element in the populist toolbox, establishing the populist leader as a folksy outsider disrespected by liberal elites.
We can expect Trump to continue …

Reflexive polytopes and the Picard ranks of Gorenstein toric Fano varieties
Zhuang He
https://arxiv.org/abs/2507.15406 https://arxiv.…

Reflexive polytopes and the Picard ranks of Gorenstein toric Fano varieties
We prove that the sum of the Picard ranks of a polar pair of Gorenstein toric Fano varieties of dimension $d\geq 3$ is at most the minimum of the number of facets and vertices of the corresponding pair of reflexive polytopes minus $(d-1)$. This is a generalization of Eikelberg's theory of affine dependences describing the Picard groups of toric varieties. The upper bound is achieved if and only if the polar pair is a simple-simplicial pair.

On accretion in the polar V379 Vir
M. V. Suslikov, A. I. Kolbin, N. V. Borisov
https://arxiv.org/abs/2506.17674 https://arxiv.org/pdf…

On accretion in the polar V379 Vir
Based on optical and infrared survey data spanning $\approx 20$ years of observations, the long-term variability of the polar V379 Vir with a brown dwarf secondary has been studied. By modeling the spectral energy distribution, we constrain the white dwarf's mass to $M_1 = 0.61 \pm 0.05~M_{\odot}$ and its effective temperature to $T_{eff} = 10930 \pm 350~K$. Near-infrared photometry yields a donor radius of $R_2 = 0.095 \pm 0.018 R_{\odot}$ and temperature $T_{eff} = 1600 \pm 180 K$. Modeling o…

An Iterative Methodology for Unitary Quantum Channel Search
Matthew M. Lin, Hao-Wei Huang, Bing-Ze Lu
https://arxiv.org/abs/2506.21455 https://

An Iterative Methodology for Unitary Quantum Channel Search
In this paper, we propose an iterative algorithm using polar decomposition to approximate a channel characterized by a single unitary matrix based on input-output quantum state pairs. In limited data, we state and prove that the optimal solution obtained from our method using one pair with a specific structure will generate an equivalent class, significantly reducing the dimension of the searching space. Furthermore, we prove that the unitary matrices describing the same channel differ by a com…

Molecular structure, electric property, and scintillation and quenching of liquid scintillators
Zhe Wang, Ye Liang, Haozhe Sun
https://arxiv.org/abs/2508.19568 https://

Molecular structure, electric property, and scintillation and quenching of liquid scintillators
Liquid scintillators are widely used in particle and nuclear physics. Understanding the scintillation and quenching mechanisms is a fundamental issue in designing a high-light-yield liquid scintillator. In this work, the basic scintillation process for a two-component liquid scintillator is reviewed, highlighting the processes of excitation, ionization, anion-cation recombination, and electric dipole-dipole energy transfer. A molecule's polar group, polarization characteristics, and the corresp…

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 …

Spectral tuning of hyperbolic shear polaritons in monoclinic gallium oxide via isotopic substitution
Giulia Carini, Mohit Pradhan, Elena Gelzinyte, Andrea Ardenghi, Saurabh Dixit, Maximilian Obst, Aditha S. Senarath, Niclas S. Mueller, Gonzalo Alvarez-Perez, Katja Diaz-Granados, Ryan A. Kowalski, Richarda Niemann, Felix G. Kaps, Jakob Wetzel, Raghunandan Balasubramanyam Iyer, Piero Mazzolini, Mathias Schubert, J. Michael Klopf, Johannes T. Margraf, Oliver Bierwagen, Martin Wolf, Karste…

Spectral tuning of hyperbolic shear polaritons in monoclinic gallium oxide via isotopic substitution
Hyperbolic phonon polaritons - hybridized modes arising from the ultrastrong coupling of infrared light to strongly anisotropic lattice vibrations in uniaxial or biaxial polar crystals - enable to confine light to the nanoscale with low losses and high directionality. In even lower symmetry materials, such as monoclinic $β$-Ga$_2$O$_3$ (bGO), hyperbolic shear polaritons (HShPs) further enhance the directionality. Yet, HShPs are intrinsically supported only within narrow frequency ranges define…

Crosslisted article(s) found for math.OA. https://arxiv.org/list/math.OA/new
[1/1]:
- Asymptotic root distribution of polynomials under repeated polar differentiation
Daniel Perales, Zhiyuan Yang

Low-Latency Software Polar Encoders and Decoders for Short Blocklengths
Mathieu Leonardon (IMT Atlantique - MEE, Lab\_STICC\_BRAIn), Mohammed El Houcine Ayoubi (IMT Atlantique), Adrien Cassagne (ALSOC), Romain Tajan (Bordeaux INP, UB), Camille Leroux (Bordeaux INP, UB)
https://arxiv.org/abs/2507.04734

Low-Latency Software Polar Encoders and Decoders for Short Blocklengths
This paper presents our low-latency Polar code encoders and decoders developed for the 2025 International Symposium on Topics in Coding (ISTC 2025) contest, which challenges participants to implement the fastest possible channel code encoders and decoders in terms of average and maximum latency on a CPU target. Our solution is based on Polar codes with an Adaptive Successive Cancellation List (ASCL) decoder. We introduce a novel ASCL unrolled decoder generator. We conduct an extensive explorati…

Joint Denoising of Cryo-EM Projection Images using Polar Transformers
Joakim And\'en, Justus Sagem\"uller
https://arxiv.org/abs/2506.11283 https:/…

Joint Denoising of Cryo-EM Projection Images using Polar Transformers
Deep neural networks~(DNNs) have proven powerful for denoising, but they are ultimately of limited use in high-noise settings, such as for cryogenic electron microscopy~(cryo-EM) projection images. In this setting, however, datasets contain a large number of projections of the same molecule, each taken from a different viewing direction. This redundancy of information is useful in traditional denoising techniques known as class averaging methods, where images are clustered, aligned, and then av…

Replaced article(s) found for physics.atom-ph. https://arxiv.org/list/physics.atom-ph/new
[1/1]:
- Ultracold Interactions between Ions and Polar Molecules
Leon Karpa, Olivier Dulieu

Exploring Data-Driven Corrections for $\phi$-Meson Global Spin Alignment Measurements
C. W. Robertson, Yicheng Feng, Fuqiang Wang
https://arxiv.org/abs/2508.18409 https://

Exploring Data-Driven Corrections for $ϕ$-Meson Global Spin Alignment Measurements
Non-central heavy ion collisions generate large orbital angular momentum (OAM), providing opportunities to study spin phenomena such as the global spin alignment of vector mesons. Such studies are expected to reveal properties of the quark-gluon plasma produced in these collisions. Global spin alignment of vector mesons, such as the $ϕ$-meson, can be measured by the $00^{\rm th}$ coefficient of the spin density matrix, $ρ_{00}$, via the polar angle of the decay kaon momentum in the parent res…

X-ray and Optical Analysis of the Prototype Polar AN UMa
S. Ok, M. Yardimci, B. Kalomeni, A. Schwope
https://arxiv.org/abs/2506.18553 https://

X-ray and Optical Analysis of the Prototype Polar AN UMa
We present a long-term optical and X-ray photometric study of AN UMa, one of the prototypical polar-type cataclysmic variables, tracing more than 34 years of its accretion history. Observations from both ground-based and space-based facilities have been analysed to investigate state transitions within the system. Throughout this period, significant changes in the light curve have been observed, corresponding to different mass accretion states. From four years of TESS photometry, we derive a rev…

Schwarzschild Black Holes Immersed in Born-Infeld Magnetic Fields and Their Observational Signatures
Yiqian Chen, Guangzhou Guo, Benrong Mu, Peng Wang
https://arxiv.org/abs/2506.19581

Schwarzschild Black Holes Immersed in Born-Infeld Magnetic Fields and Their Observational Signatures
We investigate the influence of Born-Infeld (BI) nonlinear electrodynamics on magnetic field configurations, photon orbits, and black hole shadows for Schwarzschild black holes immersed in magnetic fields. Assuming that the BI magnetic fields are asymptotically uniform and aligned with the polar axis, we solve the nonlinear magnetic field equations numerically using pseudospectral methods. Our analysis shows that nonlinear electromagnetic effects become prominent near the event horizon, particu…

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…

Atomic-scale confinement of strongly charged 180 degree domain wall pairs in ZrO2
Nashrah Afroze, Hamoon Fahrvandi, Guodong Ren, Pawan Kumar, Christopher Nelson, Sarah Lombardo, Mengkun Tian, Ping-Che Lee, Jiayi Chen, Manifa Noor, Kisung Chae, Sanghyun Kang, Prasanna Venkat Ravindran, Matthew Bergschneider, Gwan Yeong Jung, Pravan Omprakash, Gardy K. Ligonde, Nujhat Tasneem, Dina Triyoso, Steven Consiglio, Kanda Tapily, Robert Clark, Gert Leusink, Jayakanth Ravichandran, Shimeng Yu, An…

Atomic-scale confinement of strongly charged 180 degree domain wall pairs in ZrO2
Self organized polar textures can occur in ferroelectric materials across multiple length scales, from nanometer scale vortices and skyrmions, to mesoscopic stripe domains, and macroscopic twin patterns, making these phenomena central to condensed matter physics and nanotechnology. Silicon compatible ferroelectrics such as HfO2 and ZrO2 spontaneously form alternating stacks of two dimensional (2D) polar and nonpolar half unit cell layers, effectively confining dipoles to isolated, single atomic…

What's the most polar-opposite pair of places with the same or very similar names you've encountered?
For me, it would be this pairing:
https://en.wikipedia.org/wiki/Leavenworth,_Washington

Leavenworth, Washington - Wikipedia

Orthogonality of polar Legendre polynomials and approximation
Abdelhamid Rehouma
https://arxiv.org/abs/2506.04918 https://arxiv.org/p…

Orthogonality of polar Legendre polynomials and approximation
Let $\{Q_{n}(x)\}$ be a system of integral Legendre polynomials of degree exactly n,and let $\{P_{n}(x)\}$ be polar polynomials primitives of integral Legendre polynomials. We derive some identities and relations and extremal problems and minimization involving of polar integral Legendre polynomials.

A Fast, Second-Order Accurate Poisson Solver in Spherical Polar Coordinates
Jeonghyeon Ahn, Woong-Tae Kim, Yonghwi Kim
https://arxiv.org/abs/2507.06784 htt…

A Fast, Second-Order Accurate Poisson Solver in Spherical Polar Coordinates
We present an efficient and accurate algorithm for solving the Poisson equation in spherical polar coordinates with a logarithmic radial grid and open boundary conditions. The method employs a divide-and-conquer strategy, decomposing the computational domain into hierarchical units with varying cell sizes. James's algorithm is used to compute the zero-boundary potentials of lower-level units, which are systematically integrated to reconstruct the zero-boundary potential over the entire domain. …

Entropy production in non-reciprocal polar active mixtures
Kim L. Kreienkamp, Sabine H. L. Klapp
https://arxiv.org/abs/2508.05209 https://arxiv.org/pdf/250…

Entropy production in non-reciprocal polar active mixtures
The out-of-equilibrium character of active systems is often twofold, arising from both the activity itself and from non-reciprocal couplings between constituents. A well-established measure to quantify the system's distance from equilibrium is the informatic entropy production rate. Here, we ask the question whether and how the informatic entropy production rate reflects collective behaviors and transitions in an active mixture with non-reciprocal polar couplings. In such systems, non-reciproca…

Dear Apple-hating replyguys posting from the hip, when I say “my 7-year old iPad Pro still works fine and I don’t see any reason to upgrade”—that’s actually the polar opposite of “planned obsolescence”.

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

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

This https://arxiv.org/abs/2505.14884 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csLG_…

Polar Sparsity: High Throughput Batched LLM Inferencing with Scalable Contextual Sparsity
Accelerating large language model (LLM) inference is critical for real-world deployments requiring high throughput and low latency. Contextual sparsity, where each token dynamically activates only a small subset of the model parameters, shows promise but does not scale to large batch sizes due to union of active neurons quickly approaching dense computation. We introduce Polar Sparsity, highlighting a key shift in sparsity importance from MLP to Attention layers as we scale batch size and seque…

Optical Spectroscopy of the Most Compact Accreting Binary Harboring a Magnetic White Dwarf and a Hydrogen-rich Donor
Ilkham Galiullin, Antonio C. Rodriguez, Kareem El-Badry, Ilaria Caiazzo, Paula Szkody, Pranav Nagarajan, Samuel Whitebook
https://arxiv.org/abs/2508.20170

Optical Spectroscopy of the Most Compact Accreting Binary Harboring a Magnetic White Dwarf and a Hydrogen-rich Donor
Accreting white dwarfs in close binary systems, commonly known as cataclysmic variables (CVs), with orbital periods below the canonical period minimum ($\approx$ 80 minutes) are rare. Such short periods can only be reached if the donor star in the CV is either significantly evolved before initiating mass transfer to the white dwarf (WD) or metal-poor. We present optical photometry and spectroscopy of Gaia19bxc, a high-amplitude variable identified as a polar CV with an exceptionally short orbit…

Dynamic correlations in a polar fluid: confronting stochastic density functional theory to simulations
Sleeba Varghese, Pierre Illien, Benjamin Rotenberg
https://arxiv.org/abs/2507.16239

Dynamic correlations in a polar fluid: confronting stochastic density functional theory to simulations
Understanding the dynamic behavior of polar fluids is essential for modeling complex systems such as electrolytes and biological media. In this work, we develop and apply a Stochastic Density Functional Theory (SDFT) framework to describe the polarization dynamics in the Stockmayer fluid, a prototypical model of dipolar liquids consisting of Lennard-Jones particles with embedded point dipoles. Starting from the overdamped Langevin dynamics of dipolar particles, we derive analytical expressions …

Code Rate Optimization via Neural Polar Decoders
Ziv Aharoni, Bashar Huleihel, Henry D Pfister, Haim H Permuter
https://arxiv.org/abs/2506.15836 https://…

Code Rate Optimization via Neural Polar Decoders
This paper proposes a method to optimize communication code rates via the application of neural polar decoders (NPDs). Employing this approach enables simultaneous optimization of code rates over input distributions while providing a practical coding scheme within the framework of polar codes. The proposed approach is designed for scenarios where the channel model is unknown, treating the channel as a black box that produces output samples from input samples. We employ polar codes to achieve ou…

Ultracold high-spin $\Sigma$-state polar molecules for new physics searches
Alessio Ciamei, Adam Koza, Marcin Gronowski, Micha{\l} Tomza
https://arxiv.org/abs/2507.16760

Ultracold high-spin $Σ$-state polar molecules for new physics searches
We propose high-spin $Σ$-state polar molecules assembled from ultracold atoms to probe charge-parity violating physics beyond the Standard Model. We identify YbCr as a prime candidate to search for the electric dipole moment of the electron. We show that the combination of relativistic ytterbium and high-spin chromium, amenable to magneto-association, leads to molecules with easy-to-polarize parity doublets and large intramolecular electric fields. Based on \textit{ab initio} results for molec…

Hardware-friendly IR-HARQ for Polar SCL Decoders
Marwan Jalaleddine, Jiajie Li, Warren J. Gross
https://arxiv.org/abs/2508.08425 https://arxiv.org/pdf/2508…

Hardware-friendly IR-HARQ for Polar SCL Decoders
To extend the applications of polar codes within next-generation wireless communication systems, it is essential to incorporate support for Incremental Redundancy (IR) Hybrid Automatic Repeat Request (HARQ) schemes. The baseline IR-HARQ scheme's reliance on set-based operations leads to irregular memory access patterns, posing significant challenges for efficient hardware implementation. Furthermore, the introduction of new bit types increases the number of fast nodes that are decoded without t…

Towards Weight Distribution-Aware Polar Codes
Mohammad Rowshan, Vlad-Florin Dragoi
https://arxiv.org/abs/2506.15467 https://arxiv.org…

Towards Weight Distribution-Aware Polar Codes
Polar codes are constructed based on the reliability of sub-channels resulting from the polarization effect. However, this information-theoretic construction approach leads to a poor weight distribution. To address this issue, pre-transformed polar codes, such as CRC-polar codes and PAC codes, have been employed. In this paper, we focus on the structure of polar codes without applying any pre-transformations and explore methods, guided by the weight-contribution partial order, to design polar-l…

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…

Polarons in two-dimensional polar materials: All-coupling variational theory
A. Kudlis, V. Shahnazaryan, I. V. Tokatly
https://arxiv.org/abs/2507.10930 htt…

Polarons in two-dimensional polar materials: All-coupling variational theory
We present a detailed and self-contained theoretical study of polarons in two-dimensional (2D) polar materials, which extends the classical macroscopic theory of Fröhlich polarons to the 2D case. The theory is fully determined by experimentally accessible parameters, the static and optical 2D polarizabilities of a monolayer, the frequency of transverse optical phonons, and the effective mass of charge carriers. We define a single dimensionless parameter, which characterizes the coupling of ele…

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…

Sharp perturbation bounds on the Frobenius norm of subunitary and positive polar factor
Teng Zhang
https://arxiv.org/abs/2507.14940 https://

Sharp perturbation bounds on the Frobenius norm of subunitary and positive polar factor
Leveraging tools from convex analysis and incorporating additional singular value information of matrices, we completely resolve the problem of establishing perturbation bounds for the Frobenius norm of subunitary and positive polar factors. We derive corresponding sharp upper and lower bounds. As corollaries, we refine the results of Li and Sun [SIAM J. Matrix Anal. Appl., 23 (2002), pp. 1183--1193] and strengthen the classical Araki-Yamagami inequality [Comm. Math. Phys., 81 (1981), no. 1, pp…

Single-photon loading of polar molecules into an optical trap
Bart J. Schellenberg, Eifion H. Prinsen, Janko Nauta, Luk\'a\v{s} F. Pa\v{s}teka, Anastasia Borschevsky, Steven Hoekstra
https://arxiv.org/abs/2507.17521 https://arxiv.org/pdf/2507.17521 https://arxiv.org/html/2507.17521
arXiv:2507.17521v1 Announce Type: new
Abstract: We propose a scheme to transfer molecules from a slow beam into an optical trap using only a single photon absorption and emission cycle. The efficiency of such a scheme is numerically explored for BaF using realistic experimental parameters. The technique makes use of the state-dependent potential in an external electric field to trap molecules from an initial velocity of order 10m/s. A rapid optical transition at the point where the molecules come to a standstill in the electric field potential irreversibly transfers them into a ~7mK optical dipole trap. For a pulsed Stark decelerated beam, we estimated the per-shot efficiency to be ~0.04% or up to ~103 molecules, with a potential factor 20 improvement when the fields are synchronously modulated with the arriving velocity components. The irreversibility of the scheme allows for larger numbers to be built up over time. Since this scheme does not rely on a closed cycling transition for laser cooling, it broadens the range of molecules that can be used for research on cold molecular chemistry, quantum information, and fundamental interactions in optical traps.
toXiv_bot_toot

Error Detection Based on Generalized Successive Cancellation List Decoding for Polar Codes
Alexander Sauter, Mustafa Cemil Co\c{s}kun, Gianluigi Liva
https://arxiv.org/abs/2507.16699

Error Detection Based on Generalized Successive Cancellation List Decoding for Polar Codes
Successive cancellation list (SCL) decoding has been widely adopted for polar codes, which allows near maximum likelihood performance with sufficiently large list size. In this work, we show that, if the list size is $2^γ$, where $γ$ is the fundamental quantity called mixing factor, then a modification to SCL decoding can implement Forney's generalized decoding rule. Hence, it provides an efficient means to discard unreliable decisions. The performance achieved by short polar codes under the …

Long-term Optical Photometry of V709 Cas Using TESS : Refined Periods and Accretion Geometry
Srinivas M Rao, Jeewan C Pandey, Nikita Rawat, Arti Joshi, Ajay Kumar Singh
https://arxiv.org/abs/2507.19441

Long-term Optical Photometry of V709 Cas Using TESS : Refined Periods and Accretion Geometry
Utilizing high-cadence and long-term optical photometry from the Transiting Exoplanet Survey Satellite (TESS ), we conducted a time-resolved timing analysis of the Intermediate Polar, V709 Cas. Our analysis reveals key characteristics of this system: an orbital period of 5.3329 $\pm$ 0.0002 h, a spin period of 312.7478 $\pm$ 0.0002 s, and a beat period of 317.9267 $\pm$ 0.0002 s. These periods represent a significant refinement over the results of previous studies. These analyses demonstrate th…

Bicomplex polar weighted homogeneous polynomials
Yesenia Bravo, In\'acio Rabelo, Agust\'in Romano-Vel\'azquez
https://arxiv.org/abs/2506.00255 …

Bicomplex polar weighted homogeneous polynomials
We study the topology of real polynomial maps $\mathbb{R}^{4n} \longrightarrow \mathbb{R}^{4}$ expressed in terms of bicomplex variables and their conjugates, which we refer to as bicomplex mixed polynomials. We introduce the notion of polar weighted homogeneity, a property that generalizes the concept of weighted homogeneity in the complex setting. This leads to the existence of global and spherical Milnor fibrations. Moreover, we include a discussion on bicomplex vector calculus, a bicomplex …

Pulsar Sparking: What if mountains on the surface?
Zi-Hao Xu, Wei-Yang Wang, Ren-Xin Xu
https://arxiv.org/abs/2506.12305 https://arxi…

Pulsar Sparking: What if mountains on the surface?
A numerical framework to calculate the height and potential of the vacuum inner gap is proposed here. The results show that small mountains on a pulsar's polar cap tend to significantly influence the properties of the inner vacuum gap, making it easier for sparks to form. In this scenario, the magnetospheric activity observed from the pulsars PSR J0250$+$5854 and PSR J2144$-$3933, which lie below the pulsar death line, would be reproduced, and the irregular discharge behaviour in other polar ca…

Polar alignment of a circumbinary disc around a brown dwarf binary
Jeremy L. Smallwood, Thomas A. Baycroft, Amaury H. M. J. Triaud, Richard P. Nelson
https://arxiv.org/abs/2506.22747

Polar alignment of a circumbinary disc around a brown dwarf binary
Inspired by recent observations suggesting that the retrograde precession of the brown dwarf binary 2M1510 AB is consistent with induction by a polar circumbinary planet, we investigate the formation of such planets by studying the evolution of a primordial misaligned circumbinary disc around a brown dwarf binary. Analytical calculations show that a critical tilt angle of $i_{\rm crit} \gtrsim 50^\circ$ for moderately eccentric binaries is needed for polar alignment of circumbinary discs in sys…

Radii of spherical timelike geodesics in Kerr-Newman black holes
Wei Huang, Jun-Xu Chen, Jia-Hui Huang
https://arxiv.org/abs/2506.11473 https://

Radii of spherical timelike geodesics in Kerr-Newman black holes
The existence, radii and radial stability of the equatorial and non-equatorial (particularly, the polar) spherical orbits are discussed for particles with different conserved energy. The radii of these orbits generally are solutions of a quintic polynomial equation with four dimensionless parameters. For the case with $γ=1$, we obtain the analytical expressions for the radii of the polar, equatorial and general orbits. The radial stability of the orbits outside the event horizon is also discus…

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

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

Replaced article(s) found for math.CV. https://arxiv.org/list/math.CV/new
[1/1]:
- Generalizations of Some Inequalities of the Polar Derivatives of Polynomials
Deepak Kumar, Dinesh Tripathi, Sunil Hans

Neural Polar Decoders for DNA Data Storage
Ziv Aharoni, Henry D. Pfister
https://arxiv.org/abs/2506.17076 https://arxiv.org/pdf/2506.…

Neural Polar Decoders for DNA Data Storage
Synchronization errors, such as insertions and deletions, present a fundamental challenge in DNA-based data storage systems, arising from both synthesis and sequencing noise. These channels are often modeled as insertion-deletion-substitution (IDS) channels, for which designing maximum-likelihood decoders is computationally expensive. In this work, we propose a data-driven approach based on neural polar decoders (NPDs) to design low-complexity decoders for channels with synchronization errors. …

This https://arxiv.org/abs/2505.13653 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

UGC 10043 in Depth: Dissecting the Polar Bulge and Subtle LSB Features
Galaxies with polar structures -- of which polar-ring galaxies (PRGs) are a prominent subclass -- contain components that are kinematically decoupled and highly inclined relative to the host galaxy's major axis. Modern deep optical surveys provide a powerful means of detecting low surface brightness (LSB) features around galaxies, offering critical insights into the formation and evolution of galaxies with polar structures. UGC 10043 is an edge-on galaxy notable for its prominent bulge, which e…

Neural Polar Decoders for Deletion Channels
Ziv Aharoni, Henry D. Pfister
https://arxiv.org/abs/2507.12329 https://arxiv.org/pdf/2507…

Neural Polar Decoders for Deletion Channels
This paper introduces a neural polar decoder (NPD) for deletion channels with a constant deletion rate. Existing polar decoders for deletion channels exhibit high computational complexity of $O(N^4)$, where $N$ is the block length. This limits the application of polar codes for deletion channels to short-to-moderate block lengths. In this work, we demonstrate that employing NPDs for deletion channels can reduce the computational complexity. First, we extend the architecture of the NPD to suppor…

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…

Single-photon loading of polar molecules into an optical trap
Bart J. Schellenberg, Eifion H. Prinsen, Janko Nauta, Luk\'a\v{s} F. Pa\v{s}teka, Anastasia Borschevsky, Steven Hoekstra
https://arxiv.org/abs/2507.17521

Interplay of polar order and positional order in liquid crystals -- observation of re-entrant ferroelectric nematic phase
Grant Strachan, Shona Ramsay, Marijus Juodka, Damian Pociecha, Jadwiga Szydlowska, John M. D. Storey, Natasa Vaupotic, Rebecca Walker, Ewa Gorecka
https://arxiv.org/abs/2507.08754

Interplay of polar order and positional order in liquid crystals -- observation of re-entrant ferroelectric nematic phase
We show that development of polar order may spontaneously destroy the lamellar structure of a liquid crystal. This results in an unusual sequence of phases with the ferroelectric nematic phase appearing below a non-polar smectic phase. The effect is related to unfavourable dipole interactions within the smectic layers and can be explained by Landau theory in which the temperature dependent term is non-monotonic as it is renormalized by spontaneous electric polarization.

History-dependent and frequency-dependent dielectric nonlinearities induced by polar nanoregions in a thin film of 0.5 ( Ba 0.7 Ca 0.3 TiO 3 ) -- 0.5 ( BaZr 0.2 Ti 0.8 O 3 )
Kevin Nadaud (GREMAN), Guillaume Nataf (GREMAN), Nazir Jaber (GREMAN), Edgar Chaslin (GREMAN), B\'eatrice Negulescu (GREMAN), J\'er\^ome Wolfman (GREMAN, CNRS)
https://…

History-dependent and frequency-dependent dielectric nonlinearities induced by polar nanoregions in a thin film of 0.5 ( Ba 0.7 Ca 0.3 TiO 3 ) -- 0.5 ( BaZr 0.2 Ti 0.8 O 3 )
In this article, dielectric nonlinearities in 0.5(Ba0.7 Ca0.3 TiO3 ) -- 0.5(BaZr 0.2 Ti0.8 O3 ) thin film are studied using impedance spectroscopy and harmonic measurements, as a function of the AC measuring field, at different frequencies and upon cycling. The measurements reveal that the pinching of the hysteresis loop, characterized by a phase angle of the third harmonic close to --270 deg, is stronger for low frequencies. This confirms that the pinching is induced by the presence of polar n…

Last-Pair Swapping Polar Codes: A Structure to Improve Polarization on Channels with Memory
Yinuo Mei, Yangyong Zhang, Daiming Qu
https://arxiv.org/abs/2506.11535

Last-Pair Swapping Polar Codes: A Structure to Improve Polarization on Channels with Memory
A new structure of polar codes is proposed for channels with memory to improve polarization and approach the polarization efficiency of conventional polar codes on memoryless channels. We classify trellis channels, a particular type of finite state channels into two categories, called sub-injective trellis channels and non-sub-injective trellis channels, where an explicit polarization loss is observed on the former. For sub-injective trellis channels, we substitute the last kernel of each layer…

Laboratory Investigation of CO2-Driven Enhancement of Radiolytic H2O2 on Europa and Other Icy Moons
Bereket D. Mamo, Ujjwal Raut, Ben D. Teolis, Trevor P. Erwin, Richard J. Cartwright, Silvia Protopapa, Kurt D. Retherford, Tom A. Nordheim
https://arxiv.org/abs/2506.15819

Laboratory Investigation of CO2-Driven Enhancement of Radiolytic H2O2 on Europa and Other Icy Moons
Observations of Europa's leading hemisphere reveal elevated H2O2 in the warmer, low latitude chaos terrains compared to the colder, polar regions. This distribution disagrees with prior laboratory radiolysis studies of pure water ice, which show higher H2O2 yields at colder temperatures. The regions with higher peroxide abundance, Tara and Powys Regiones, also present increased amounts of CO2, possibly sourced from Europa's interior. To investigate whether CO2 influences radiolysis of water ice…

Driving a stimuli-responsive wedge in the packing of phospholipid membranes using bolaamphiphile intercalants
Niki Baccile (LCMCP-SMiLES), Archan Vyas (UC Davis), Ramanujam Ramanujam (LCMCP-SMiLES), Daniel Hermida-Merino (ILL), Ingo Hoffmann (ILL), Lionel Porcar (ILL), Atul N. Parikh (UC Davis)
https://arxiv.org/abs/2508.17946

Driving a stimuli-responsive wedge in the packing of phospholipid membranes using bolaamphiphile intercalants
Bolaamphiphilesamphiphilic molecules with polar groups at each of the two ends of a hydrophobic tail with pH-sensitive spontaneous molecular curvaturesendow membranes of extremophiles with an exquisite balance between stability (or robustness) and adaptability (or plasticity). But how the presence (or real-time insertion) of bolaamphiphiles influences lamellar lipid membranes is poorly understood. Using a combination of time-resolved confocal fluorescence microscopy, in situ small angle X-ray a…

Discovering the Unequal Importance of Coded Bits in the Decoding of Polar Codes
Hossam Hassan, Ali Gaber, Mohammed Karmoose, Noha Korany
https://arxiv.org/abs/2507.08598

Discovering the Unequal Importance of Coded Bits in the Decoding of Polar Codes
Polar codes are widely used in modern communication systems due to their capacity-achieving properties. This paper investigates the importance of coded bits in the decoding process of polar codes and aims to determine which bits contribute most to successful decoding. We investigate the problem via a brute-force search approach and surrogate optimization techniques to identify the most critical coded bits. We also demonstrate how mapping these important bits to the most reliable channels improv…

Flexoelectric Polarization Enhancement in Paraelectric $\mathrm{BaHfO_3}$ via Strain Gradient Engineering
Timo Piecuch, Jeffrey A. Brock, Xiaochun Huang, Arnold M. M\"uller, Christof Vockenhuber, Christof W. Schneider, Thomas Lippert, Nick A. Shepelin
https://arxiv.org/abs/2506.19690

Flexoelectric Polarization Enhancement in Paraelectric $\mathrm{BaHfO_3}$ via Strain Gradient Engineering
Flexoelectricity - polarization induced by strain gradients - offers a route to polar functionality in centrosymmetric dielectrics, where traditional piezoelectric effects are absent. This study investigates the flexoelectric effect in epitaxial $\mathrm{BaHfO_3}$ (BHO) thin films, a centrosymmetric and paraelectric perovskite. While a large lattice mismatch induces defect-driven relaxation, a coherently grown BHO film undergoes elastic relaxation, forming intrinsic strain gradients exceeding $…

Hydrodynamic Theory of Two-dimensional Chiral Malthusian Flocks
Leiming Chen, Chiu Fan Lee, John Toner
https://arxiv.org/abs/2507.17762 https://arxiv.org/p…

Hydrodynamic Theory of Two-dimensional Chiral Malthusian Flocks
We study the hydrodynamic behavior of two-dimensional chiral dry Malthusian flocks; that is, chiral polar-ordered active matter with neither number nor momentum conservation. We show that, in the absence of fluctuations, such systems generically form a ``time cholesteric", in which the velocity of the entire system rotates uniformly at a fixed frequency b. Fluctuations about this state belong to the universality class of (2+1)-Kardar-Parisi-Zhang (KPZ) equation, which implies short-ranged orien…

An underdog story: Re-emergence of a polar instability at high pressure in KNbO3
Mohamad Baker Shoker, Sitaram Ramakrishnan, Boris Croes, Olivier Cregut, Nicolas Beyer, Kokou Dorkenoo, Pierre Rodi\`ere, Bj\"orn Wehinger, Gaston Garbarino, Mohamed Mezouar, Marine Verseils, Pierre Fertey, Salia Cherifi-Hertel, Pierre Bouvier, Mael Guennou
https://

An underdog story: Re-emergence of a polar instability at high pressure in KNbO3
Ferroelectricity in perovskites is known to be suppressed by a moderate hydrostatic pressure. The notion that a polar instability should reappear in a higher pressure regime is well accepted theoretically but experiments have failed so far to provide a conclusive evidence for it. Here, we investigate a classical but comparatively underlooked ferroelectric perovskite KNbO3. We use single crystal X-ray diffraction, infrared and Raman spectroscopy and second-harmonic generation to explore the phas…

Challenges and opportunities in piezoelectric polymers: Effect of oriented amorphous fraction in ferroelectric semicrystalline polymers
Guanchun Rui, Elshad Allahyarov, Zhiwen Zhu, Yanfei Huang, Thumawadee Wongwirat, Qin Zou, Philip L. Taylor, Lei Zhu
https://arxiv.org/abs/2506.18722

Challenges and opportunities in piezoelectric polymers: Effect of oriented amorphous fraction in ferroelectric semicrystalline polymers
Despite extensive research on piezoelectric polymers since the discovery of piezoelectric poly(vinylidene fluoride) (PVDF) in 1969, the fundamental physics of polymer piezoelectricity has remained elusive. Based on the classic principle of piezoelectricity, polymer piezoelectricity should originate from the polar crystalline phase. Surprisingly, the crystal contribution to the piezoelectric strain coefficient d31 is determined to be less than 10%, primarily owing to the difficulty in changing t…

Enhanced thermopower in a magnetic semiconductor EuTe4 with multiple charge-density-wave instabilities/
Hidefumi Takahashi, Kiichiro Yoshida, Akitoshi Nakano, Shintaro Ishiwata
https://arxiv.org/abs/2508.16017

Enhanced thermopower in a magnetic semiconductor EuTe4 with multiple charge-density-wave instabilities/
We investigate the layered magnetic semiconductor EuTe4, focusing on its intricate charge-density wave (CDW) states near and above room temperature through single-crystal X-ray diffraction (XRD), magnetic, and thermoelectric measurements.The XRD measurement revealed that the CDW state inducing the polar lattice distortion persists even at 650 K, demonstrating its remarkable thermal stability. Notably, the Seebeck coefficient near room temperature reaches values exceeding 500 uVK-1. This large S…

On the Synthetic Channels in Polar Codes over Binary-Input Discrete Memoryless Channels
Yadong Jiao, Xiaoyan Cheng, Yuansheng Tang, Ming Xu
https://arxiv.org/abs/2506.04163

On the Synthetic Channels in Polar Codes over Binary-Input Discrete Memoryless Channels
Polar codes introduced by Arikan in 2009 are the first code family achieving the capacity of binary-input discrete memoryless channels (BIDMCs) with low-complexity encoding and decoding. Identifying unreliable synthetic channels in polar code construction is crucial. Currently, because of the large size of the output alphabets of synthetic channels, there is no effective approach to evaluate their reliability, except in the case that the underlying channels are binary erasure channels. This pap…

The Interplay of Polar and Nematic Order in Active Matter: Implications for Non-Equilibrium Physics and Biology
Varun Venkatesh, Niels de Graaf Sousa, Amin Doostmohammadi
https://arxiv.org/abs/2506.05931

The Interplay of Polar and Nematic Order in Active Matter: Implications for Non-Equilibrium Physics and Biology
Active matter has played a pivotal role in advancing our understanding of non-equilibrium systems, leading to a fundamental shift in the study of biophysical phenomena. The foundation of active matter research is built on assumptions regarding the symmetry of microscopic constituents. While these assumptions have been validated extensively, instances of mixed or joint symmetries are prevalent in biological systems. This review explores the coexistence of polar and nematic order in active matter…

Long Polar vs. LDPC Codes under Complexity-Constrained Decoding
Felix Krieg, Marvin R\"ubenacke, Andreas Zunker, Stephan ten Brink
https://arxiv.org/abs/2508.05485 https://…

Long Polar vs. LDPC Codes under Complexity-Constrained Decoding
The prevailing opinion in industry and academia is that polar codes are competitive for short code lengths, but can no longer keep up with low-density parity-check (LDPC) codes as block length increases. This view is typically based on the assumption that LDPC codes can be decoded with a large number of belief propagation (BP) iterations. However, in practice, the number of iterations may be rather limited due to latency and complexity constraints. In this paper, we show that for a similar numb…

Boltzmann-Ginzburg-Landau theory for autochemotaxis of active rod-like particles
Shun Sakurai, Nariya Uchida
https://arxiv.org/abs/2506.18263 https://

Boltzmann-Ginzburg-Landau theory for autochemotaxis of active rod-like particles
We investigate the interplay between chemotaxis and alignment interactions in active rod-like particles, such as E. coli and Janus rods. Starting from a discrete model of self-propelled rods with chemotactic responses, we employ a Boltzmann-Ginzburg-Landau (BGL) approach to derive coarse-grained dynamical equations for the density, polar and nematic orientational order parameters, and the concentration field of the chemoattractant. We perform a linear stability analysis for fluctuations around …

Polar Express: Rapid Functionalization of Single-Walled Carbon Nanotubes in High Dipole Moment Media
Dominik Just, Ryszard Siedlecki, Maciej Krzywiecki, Oussama Er-Riyahi, Yann Pouillon, Javier Junquera, Karolina Z. Milowska, Dawid Janas
https://arxiv.org/abs/2508.09039

Polar Express: Rapid Functionalization of Single-Walled Carbon Nanotubes in High Dipole Moment Media
Fluorescent semiconducting single-walled carbon nanotubes (SWCNTs) hold considerable promise for photonics. Furthermore, the optical characteristics of the material can be significantly improved by covalent modification, which generates new spectral features in the near-infrared region and enhances its photoluminescence quantum yield. However, despite the dynamic development of this research domain, the importance of the solvent environment in which the SWCNT functionalization is conducted rema…

Lattice-dependent orientational order in active crystals
Till Welker, Ricard Alert
https://arxiv.org/abs/2506.16501 https://arxiv.org…

Lattice-dependent orientational order in active crystals
Via mechanisms not accessible at equilibrium, self-propelled particles can form phases with positional order, such as crystals, and with orientational order, such as polar flocks. However, the interplay between these two types of order remains relatively unexplored. Here, we address this point by studying crystals of active particles that turn either towards or away from each other, which can be experimentally realised with phoretic or Janus colloids or with elastically-coupled walker robots. W…

Volcano-Like Ferroic Transitions Deviating from the Model of Landau Theory
Yuxuan Sheng, Menghao Wu
https://arxiv.org/abs/2507.11409 https://

Volcano-Like Ferroic Transitions Deviating from the Model of Landau Theory
We predict the existence of abnormal volcano-like temperature dependence of polarization or magnetization with maxima located at elevated temperature, distinct from classical model based on Landau theory. One case is ferroelectricity with long ion displacements and quantized polarizations that cannot be used for expansion in Landau model, and the switching pathway involves various metastable phases where the polar phase is higher both in energy and entropy compared with non-polar phase. Another…

Giant Reversible Piezoelectricity from Symmetry-Governed Stochastic Dipole Hopping
Denan Li, Haofei Ni, Yi Zhang, Shi Liu
https://arxiv.org/abs/2507.15687 …

Giant Reversible Piezoelectricity from Symmetry-Governed Stochastic Dipole Hopping
Organic--inorganic hybrid perovskites with giant piezoelectric responses, exemplified by TMCM-CdCl$_3$, represent a promising platform for flexible and environmentally friendly electromechanical materials. However, the microscopic origin of such exceptional performance in this weakly polar system has remained elusive. Here, using deep-learning-assisted large-scale molecular dynamics simulations, we resolve this paradox by reproducing the experimentally measured piezoelectric coefficient $d_{33}…

DeepPolar : Breaking the BER-BLER Trade-off with Self-Attention and SMART (SNR-MAtched Redundancy Technique) decoding
Shubham Srivastava, Adrish Banerjee
https://arxiv.org/abs/2506.10166

DeepPolar+: Breaking the BER-BLER Trade-off with Self-Attention and SMART (SNR-MAtched Redundancy Technique) decoding
DeepPolar codes have recently emerged as a promising approach for channel coding, demonstrating superior bit error rate (BER) performance compared to conventional polar codes. Despite their excellent BER characteristics, these codes exhibit suboptimal block error rate (BLER) performance, creating a fundamental BER-BLER trade-off that severely limits their practical deployment in communication systems. This paper introduces DeepPolar+, an enhanced neural polar coding framework that systematicall…