Tootfinder

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

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…

A Neural Network-aided Low Complexity Chase Decoder for URLLC
Enrico Testi, Enrico Paolini
https://arxiv.org/abs/2506.10513 https://a…

A Neural Network-aided Low Complexity Chase Decoder for URLLC
Ultra-reliable low-latency communications (URLLC) demand decoding algorithms that simultaneously offer high reliability and low complexity under stringent latency constraints. While iterative decoding schemes for LDPC and Polar codes offer a good compromise between performance and complexity, they fall short in approaching the theoretical performance limits in the typical URLLC short block length regime. Conversely, quasi-ML decoding schemes for algebraic codes, like Chase-II decoding, exhibit …

Tip-Based Proximity Ferroelectric Switching and Piezoelectric Response in Wurtzite Multilayers
Eugene A. Eliseev, Anna N. Morozovska, Sergei V. Kalinin, Long-Qing Chen, Venkatraman Gopalan
https://arxiv.org/abs/2506.09196

Tip-Based Proximity Ferroelectric Switching and Piezoelectric Response in Wurtzite Multilayers
Proximity ferroelectricity is a novel paradigm for inducing ferroelectricity, where a non-ferroelectric polar material, which is unswitchable with an external field below the dielectric breakdown field, becomes a practically switchable ferroelectric in direct contact with a thin switchable ferroelectric layer. Here, we develop a Landau-Ginzburg-Devonshire approach to study the proximity effect of local piezoelectric response and polarization reversal in wurtzite ferroelectric multilayers under …

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. …

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…

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…

Multi-band, Multi-epoch Photometry of the Spot-crossing System TOI-3884: Refined System Geometry and Spot Properties
Mayuko Mori, Akihiko Fukui, Teruyuki Hirano, Norio Narita, John H. Livingston, Khalid Barkaoui, Karen A. Collins, Jerome P. de Leon, Kai Ikuta, Yugo Kawai, Richard P. Schwarz, Avi Shporer, Gregor Srdoc
https://arx…

Multi-band, Multi-epoch Photometry of the Spot-crossing System TOI-3884: Refined System Geometry and Spot Properties
Spot-crossing transits offer a unique opportunity to probe spot properties such as temperature, size, and surface distribution. TOI-3884 is a rare system in which spot-crossing features are persistently observed during every transit. This is due to its unusual configuration: a polar-orbiting super-Neptune transits a pole-on mid-M dwarf, repeatedly crossing a polar spot. However, previous studies have reported discrepant values in key system parameters, such as stellar inclination and obliquity.…

This https://arxiv.org/abs/2409.17464 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Computation of $\langle Φ^2\rangle$ and quantum fluxes at the polar interior of a spinning black hole
Renormalization of physical quantities for quantum field theories in curved spacetimes can be achieved via the consistent subtraction of counterterms within a regularization scheme such as a point-splitting method. Pragmatic mode-sum regularization (PMR) is a point-splitting method which is particularly suitable for rotating black hole spacetimes. We extend and tailor the t-splitting variant of PMR specifically for the interior of a Kerr black hole on the axis of rotation, focusing on a minimal…

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.

The British Antarctic Survey has opened its big new operations facility.
https://www.bas.ac.uk/media-post/major-antarctic-operations-hub-switches-on-to-support-uk-polar-science/

Major Antarctic operations hub switches on to support UK polar science - British Antarctic Survey
The British Antarctic Survey’s (BAS) new scientific support and operations facility, the Discovery Building, is now coming into operational use at Rothera Research Station in Antarctica. Marking a major milestone for the Antarctic Infrastructure Modernisation Programme (AIMP), the facility consolidates the UK’s position in global polar research.

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…

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…

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 …

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 […]

This https://arxiv.org/abs/2505.21896 has been replaced.
initial toot: https://mastoxiv.page/@…

Theory of itinerant collisional spin dynamics in nondegenerate molecular gases
We study the fully itinerant dynamics of ultracold but nondegenerate polar molecules with a spin-$1/2$ degree of freedom encoded into two of their electric field dressed rotational states. Center of mass molecular motion is constrained to two-dimensions via tight confinement with a one-dimensional optical lattice, but remains mostly unconstrained within the plane. The pseudospins can become entangled through ultracold dipolar collisions, for which the locality of interactions is greatly relaxed…

Correlated quantum shift vector of particle-hole excitations
Xu Yang, Ajit Srivastava, Justin C. W. Song
https://arxiv.org/abs/2507.07182 https://

Correlated quantum shift vector of particle-hole excitations
Excitons are a prime example of how electron interactions affect optical response and excitation. We demonstrate that, beyond its spectra, the bound nature of an exciton's electron-hole pair produces a correlated quantum geometry: excitonic excitations possess a quantum shift vector that is independent of light polarization. We find this counterintuitive behavior has dramatic consequences for geometric response: e.g., in noncentrosymmetric but non-polar materials, vertical excitonic transitions…

New properties of weighted generalized core-EP inverse in Banach algebras
Huanyin Chen, Marjan Sheibani
https://arxiv.org/abs/2507.07777 https://

New properties of weighted generalized core-EP inverse in Banach algebras
We characterize the generalized weighted core-EP inverse via the canonical decomposition, utilizing a weighted core-EP invertible element and a quasinilpotent. We then offer a polar-like characterization for the generalized weighted core-EP invertible element. The representations of the generalized weighted core-EP inverse by leveraging the weighted generalized Drazin inverse are thereby presented. These lead to new properties for the weighted core-EP inverse.

Imaging 3D polarization dynamics via deep learning 4D-STEM
Jinho Byun, Keeyong Lee, Myoungho Jeong, Eunha Lee, Jeongil Bang, Haeryong Kim, Geun Ho Gu, Sang Ho Oh
https://arxiv.org/abs/2506.06598

Imaging 3D polarization dynamics via deep learning 4D-STEM
Recent advances in ferroelectrics highlight the role of three-dimensional (3D) polar entities in forming topological polar textures and generating giant electromechanical responses, during polarization rotation. However, current electron microscopy methods lack the depth resolution to resolve the polarization component along the electron beam direction, which restricts full characterization. Here, we present a deep learning framework combined with four-dimensional scanning transmission electron…

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…

"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 […]

This https://arxiv.org/abs/2306.11707 has been replaced.
link: https://scholar.google.com/scholar?q=a

Hexagonal circular 3-webs with reducible polar curves of degree three
The paper reports the progress with the classical problem, posed by Blaschke and Bol in 1938. We present new examples and new classifications of natural classes of hexagonal circular 3-webs. The main results is the classification of hexagonal circular 3-webs with reducible polar curves of degree 3 and description of hexagonal circular 3-webs admitting a one-parameter Möbius symmetry.

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…

Defect states in compressible active polar fluids with turnover
Ludovic Dumoulin, Carles Blanch-Mercader, Karsten Kruse
https://arxiv.org/abs/2506.03795 ht…

Defect states in compressible active polar fluids with turnover
Biological active matter like the cytoskeleton or tissues are characterized by their ability to transform chemical energy into mechanical stress. In addition, it often exhibits orientational order, which is essential for many cellular and morphogenetic processes. Experimental evidence suggests that defects in the orientational order field play an important role in organizing active stress. However, defects tend to annihilate unless the material is in a chaotic state or hydrodynamic interactions…

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 …

Hydrodynamic bend instability of motile particles on a substrate
Sameer Kumar, Niels de Graaf Sousa, Amin Doostmohammadi
https://arxiv.org/abs/2507.07392 h…

Hydrodynamic bend instability of motile particles on a substrate
The emergence of hydrodynamic bend instabilities in ordered suspensions of active particles is widely observed across diverse living and synthetic systems, and is considered to be governed by dipolar active stresses generated by the self-propelled particles. Here, using linear stability analyses and numerical simulations, we show that a hydrodynamic bend instability can emerge in the absence of any dipolar active stress and solely due to the self-propulsion force acting on polar active units su…

The fraction of polar aligned circumbinary disks
Ted M. Johnson, Rebecca G. Martin, Stephen Lepp, Stephen H. Lubow
https://arxiv.org/abs/2505.22728 https:/…

The fraction of polar aligned circumbinary disks
Circumbinary gas disks that are misaligned to the binary orbital plane evolve toward either a coplanar or a polar-aligned configuration with respect to the binary host. The preferred alignment depends on the dynamics of the disk: whether it undergoes librating or circulating nodal precession, with librating disks evolving to polar inclinations and circulating disks evolving to coplanar. We quantify the fraction of binary star systems whose disks are expected to have polar orbits $f_\text{polar}…

Preliminary analysis of the annual component of the polar motion over 180-year data interval
Natalia Miller, Zinovy Malkin
https://arxiv.org/abs/2507.00197

Preliminary analysis of the annual component of the polar motion over 180-year data interval
The paper presents preliminary results of studying variations in the annual component in the Earth's polar motion. For this purpose, a signal with an annual period was extracted, firstly, from the series of pole coordinates of the International Earth Rotation and Reference Systems Service (IERS), and secondly, from the combined series of Pulkovo latitude variations for 1840--2017. For this purpose, one-dimensional and multidimensional singular spectrum analysis was used. The Hilbert transform w…

Power-Linear Polar Directional Fields
Jiabao Brad Wang, Amir Vaxman
https://arxiv.org/abs/2506.00222 https://arxiv.org/pdf/2506.00222…

Power-Linear Polar Directional Fields
We introduce a novel method for directional-field design on meshes, enabling users to specify singularities at any location on a mesh. Our method uses a piecewise power-linear representation for phase and scale, offering precise control over field topology. The resulting fields are smooth and accommodate any singularity index and field symmetry. With this representation, we mitigate the artifacts caused by coarse or uneven meshes. We showcase our approach on meshes with diverse topologies and t…

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…

Record cold grips Argentina, Chile and Uruguay #Argentina

Record cold grips Argentina, Chile and Uruguay
A polar air mass has brought record low temperatures to Argentina, Chile and Uruguay, causing at least 15 deaths and forcing governments to restrict gas supplies and activate emergency shelters.

Emergence of local ordering and giant number fluctuations in active turbulence
Kirti Kashyap, Kolluru Venkata Kiran, Anupam Gupta
https://arxiv.org/abs/2507.04890

Emergence of local ordering and giant number fluctuations in active turbulence
We study spatiotemporal chaos in dense active suspensions using a generalized hydrodynamic model. As the activity is increased, we observe a clear structural transition marked by the formation of intense, spatially organized vortices with the appearance of giant number fluctuations. This transition is accompanied by the emergence of local polar ordering, an increase in velocity correlations, and a shift in the velocity distribution from unimodal to bimodal. Beyond activity, reducing the instabi…

This https://arxiv.org/abs/2212.12237 has been replaced.
link: https://scholar.google.com/scholar?q=a

Electron-phonon interaction and phonons in 2d doped semiconductors
Electron-phonon interaction and phonon frequencies of doped polar semiconductors are sensitive to long-range Coulomb forces and can be strongly affected by screening effects of free carriers, the latter changing significantly when approaching the two-dimensional limit. We tackle this problem within a linear-response dielectric-matrix formalism, where screening effects can be properly taken into account by generalized effective charge functions and the inverse scalar dielectric function, allowin…

Solvated electrons in polar liquids as epsilon-near-zero materials tunable in the terahertz frequency range
Matthias Runge, Michael Woerner, Denys I. Bondar, Thomas Elsaesser
https://arxiv.org/abs/2505.22198

Solvated electrons in polar liquids as epsilon-near-zero materials tunable in the terahertz frequency range
Electrons in polar liquids give rise to a polaron resonance at a terahertz (THz) frequency ν_0 depending on electron concentration. The impact of this resonance on light propagation is studied in experiments, where a femtosecond pump pulse generates electrons via multiphoton ionization and a THz probe pulse propagated through the excited sample is detected in a phase-resolved way. We observe a behavior characteristic for epsilon-near-zero (ENZ) materials with strongly modified phase and group …

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.

This https://arxiv.org/abs/2505.23460 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Spin polarized enantio-sensitive multipolar photoelectron currents
Photoelectron circular dichroism (PECD) manifests as a forward-backward asymmetry of electron emission in the direction orthogonal to the light polarization plane via one-photon ionization of chiral molecules with circularly polarized light. Multi-polar `PECD' currents, i.e., currents resolved along multiple directions, have also been predicted using two mutually-orthogonal linearly polarized light with carrier frequencies $ω$ and $2ω$. These currents arise from the interference between the o…

Weekend #Plankton Factoid 🦠🦐
Light is an extremely important factor in the oceans. It governs not only photosynthesis, but is also an important cue for vertically migrating zooplankton and needed for visual predation. The finding that 20% of the #oceans, especially at vital polar regions, are incre…

making a splash #PolarBear

Mesoscopic Helices of Polar Domains in a Quadruple Perovskite
Yang Zhang, Mingyu Xu, Jie Li, Suk Hyun Sung, Sang-Wook Cheong, Weiwei Xie, Ismail El Baggari
https://arxiv.org/abs/2506.03048

Mesoscopic Helices of Polar Domains in a Quadruple Perovskite
A significant effort in condensed matter physics is dedicated to the search for exotic arrangements of electric dipoles. Beyond collinear alignments of electric dipoles, more complex arrangements analogous to magnetic spin textures, such as polar vortices and skyrmions, have been realized. Here we report atomic-scale visualizations of a candidate for helical texture of electric dipoles, the lightly doped quadruple perovskite BiCu$_{x}$Mn$_{7-x}$O$_{12}$. Rather than forming a continuous incomme…

This https://arxiv.org/abs/2503.14727 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csRO_…

Beacon-Based Feedback Control for Parking an Active-Joint Center-Articulated Mobile Robot
This paper presents an autonomous parking control strategy for an active-joint center-articulated mobile robot. We first derive a kinematic model of the robot, then propose a control law to stabilize the vehicle's configuration within a small neighborhood of the goal. The control law, designed using Lyapunov techniques, is based on the robot's polar coordinate equations. A beacon-based guidance system provides feedback on the target's position and orientation. Simulations demonstrate the robot'…

Three-Dimensional Hieratical Twist in Polar Fluids: Ultra-Low Field-Induced Chirality Regulation
Hiroya Nishikawa, Dennis Kwaria, Atsuko Nihonyanagi, Fumito Araoka
https://arxiv.org/abs/2505.24628

Three-Dimensional Hieratical Twist in Polar Fluids: Ultra-Low Field-Induced Chirality Regulation
Recently discovered helical polar fluid adopts a spontaneous chiral symmetry breaking (CSB) driven by polarization escape and conformational chirality. Ferroelectric nematic and smectic phases are intrinsically chiral in the ground state and can be stabilized in an extrinsic twisted configuration through surface anchoring. Herein, we introduce extrinsic CSB as a novel technique in chiral engineering. To demonstrate this concept, we constructed the extrinsic structure of a helielectric conical m…

This https://arxiv.org/abs/2411.13720 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csGT_…

Distortion of Multi-Winner Elections on the Line Metric: The Polar Comparison Rule
We study the problem of selecting a committee of size $k$ from a set of $m$ alternatives, based solely on the ordinal preferences of voters. Both voters and alternatives lie on the line metric, and the goal is to minimize a social cost function based on metric distances. While the distances to committee members fully determine the social cost, voting rules only have access to the ordinal preference list of each voter. The distortion of a voting rule is the worst-case ratio between the cost of t…

This https://arxiv.org/abs/2403.14322 has been replaced.
initial toot: https://mastoxiv.page/@a…

Ab-initio Van der Waals electrodynamics: polaritons and electron scattering from plasmons and phonons in BN-capped graphene
Plasmons and polar phonons are elementary electrodynamic excitations of matter. In 2d and at long wavelengths, they couple to light and act as the system polaritons. They also dictate the scattering of charged carriers. Van der Waals heterostructures offer the opportunity to couple excitations from different layers via long-range Coulomb interactions, modifying both their dispersion and their scattering of electrons. Even when the excitations do not couple, they are still influenced by the scre…

Ice cap? What am I supposed to do with a polar ice cap? I've got all the ice I need already.

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…

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…

Controlling rovibrational state populations of polar molecules in inhomogeneous electric fields of the Stark deceleration: molecular dynamics and quantum chemistry simulations
Emil Zak, Jochen K\"upper, Andrey Yachmenev
https://arxiv.org/abs/2506.04798

Effective potential and scattering length of shielding polar molecules
Peng Xu, Gang Chen
https://arxiv.org/abs/2505.22122 https://ar…

Effective potential and scattering length of shielding polar molecules
We investigate the effective potential and scattering length of ultracold polar molecules under different shielding techniques. First, we derive the effective potential for two polar molecules in the presence of an elliptical polarization field, combined elliptical and linear polarization fields, and combined elliptical polarization and static fields. The effective potential is then expressed as a sum of a zero-range contact interaction and a long-range dipole-dipole interaction under the Born …

Instabilities and turbulence in extensile swimmer suspensions
Purnima Jain, Navdeep Rana, Roberto Benzi, Prasad Perlekar
https://arxiv.org/abs/2507.06239 h…

Instabilities and turbulence in extensile swimmer suspensions
We study low Reynolds number turbulence in a suspension of polar, extensile, self-propelled inertial swimmers. We review the bend and splay mechanisms that destabilize an ordered flock. The suspension is always unstable to bend perturbations. Using a minimal 1D model, we show that the splay-stable to splay-unstable transition occurs via a supercritical Hopf bifurcation. We perform high-resolution numerical simulations in 2D to study the varieties of turbulence present in this system transitioni…

I love this map, seen at the American Museum in Bath. The creatures are closer to reality than many such maps, but still very much mythical.
Map of the Polar Regions
Theodor de Bry (1528-1598) Copperplate engraving, Frankfurt, 1601
#Art #maps

Did you know that one of the main ingredients of #gravy is mined at the north pole?. It is often made of starch which is a polar molecule. Like oil vast quantities of the #gravy precursor are mined. The south pole presently does not have starch mines . They do have to be careful while mining since …

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…

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…

Spherical photon orbits around the Kerr-like black hole in Einstein-Bumblebee gravity
Shi-Yu Li, Song-Shan Luo, Zhong-Wen Feng
https://arxiv.org/abs/2507.03981

Spherical photon orbits around the Kerr-like black hole in Einstein-Bumblebee gravity
In this paper, we investigate the photon orbits around a Kerr-like black hole in Einstein-Bumblebee gravity, where Lorentz symmetry is spontaneously broken. By solving the Hamilton-Jacobi equation, we derive a sixth-order polynomial that governs the photon motion, explicitly dependent on the rotation parameter $u$, the Lorentz violation parameter $\ell$, and the effective inclination angle $v$. We analyze photon orbit configurations in polar, equatorial, and general inclined planes, identifying…

Common topological origin of longitudinal and transverse magnetoresistance in Fe3GeTe2
Alapan Bera, Soumik Mukhopadhyay
https://arxiv.org/abs/2507.07458 ht…

Common topological origin of longitudinal and transverse magnetoresistance in Fe3GeTe2
In this work, we reveal the coexistence and correlation of a topological cusp anomaly in the planar Hall signal and a spin-flip scattering dominated positive longitudinal magnetoresistance (MR) across the entire temperature range below the Curie point in Fe3GeTe2. This correlation dies out exponentially as the magnetic field is directed away from the ab-plane, resulting in unusually sharp polar angle dependence of longitudinal MR and the Hall response.

Spin-glass state in nickelate superconductors
David R. Saykin, Martin Gonzalez, Jennifer Fowlie, Steven A. Kivelson, Harold Hwang, Aharon Kapitulnik
https://arxiv.org/abs/2506.03262

Spin-glass state in nickelate superconductors
Magneto-optical measurements in La${}_{0.8}$Sr${}_{0.2}$NiO${}_2$ and Nd${}_{0.825}$Sr${}_{0.175}$NiO${}_2$ reveal an intriguing new facet of infinite-layer nickelate superconductors: the onset of spin-glass behavior at a temperature far exceeding the superconducting critical temperature $T_c$. This discovery sharply contrasts with copper oxide superconductors, where magnetism and superconductivity remain largely exclusive. Moreover, the magnitude and onset temperature of the polar Kerr effect …

Evidence for supramolecular dynamics of non-hydrogen bonding polar van der Waals liquids
Shalin Patil, Catalin Gainaru, Roland B\"ohmer, Shiwang Cheng
https://arxiv.org/abs/2506.00678

Evidence for supramolecular dynamics of non-hydrogen bonding polar van der Waals liquids
Non-hydrogen bonding van der Waals liquids with dipole-dipole interactions are typically viewed as non-associative and not considered able to sustain large supramolecular structures. Combining broadband dielectric spectroscopy (BDS) and rheology, we demonstrate the supramolecular formation in a group of non-hydrogen-bonding van der Waals liquids, i.e. 1-bromo-2-ethylhexane, 1-chloro-2-ethylhexane, and 1-bromo-3,7-dimethyloctane. BDS shows an emergence of a Debye-like process slower than their s…

Novel Complex-Valued Hopfield Neural Networks with Phase and Magnitude Quantization
Garimella Ramamurthy, Marcos Eduardo Valle, Tata Jagannadha Swamy
https://arxiv.org/abs/2507.00461

Novel Complex-Valued Hopfield Neural Networks with Phase and Magnitude Quantization
This research paper introduces two novel complex-valued Hopfield neural networks (CvHNNs) that incorporate phase and magnitude quantization. The first CvHNN employs a ceiling-type activation function that operates on the rectangular coordinate representation of the complex net contribution. The second CvHNN similarly incorporates phase and magnitude quantization but utilizes a ceiling-type activation function based on the polar coordinate representation of the complex net contribution. The prop…

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…

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…

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View Falko Zurell's walk on 29. Mai 2025 | Strava

Planet-disc interactions around eccentric binaries and misaligned ring formation
Rebecca G. Martin, Stephen H. Lubow
https://arxiv.org/abs/2507.06675 https…

Planet-disc interactions around eccentric binaries and misaligned ring formation
We explore the evolution of a giant planet that interacts with a circumbinary disc that orbits a misaligned binary by means of analytic models and hydrodynamical simulations. Planet-disc interactions lead to mutual tilt oscillations between the planet and the disc. Even if circumbinary gas discs form with an isotropic mutual misalignment to the binary, planet-disc interactions can cause giant planets to evolve towards coplanar or polar alignment. For a low-mass disc, the binary dominates the dy…

Strain-Stabilized Interfacial Polarization Tunes Work Function Over 1 eV in RuO2/TiO2 Heterostructures
Seung Gyo Jeong, Bonnie Y. X. Lin, Mengru Jin, In Hyeok Choi, Seungjun Lee, Zhifei Yang, Sreejith Nair, Rashmi Choudhary, Juhi Parikh, Anand Santhosh, Matthew Neurock, Kelsey A. Stoerzinger, Jong Seok Lee, Tony Low, Qing Tu, James M. LeBeau, Bharat Jalan

Strain-Stabilized Interfacial Polarization Tunes Work Function Over 1 eV in RuO2/TiO2 Heterostructures
Interfacial polarization-charge accumulation at the heterointerface-is a well-established tool in semiconductors, but its influence in metals remains unexplored. Here, we demonstrate that interfacial polarization can robustly modulate surface work function in metallic rutile RuO2 layers in epitaxial RuO2/TiO2 heterostructures grown by hybrid molecular beam epitaxy. Using multislice electron ptychography, we directly visualize polar displacements of transition metal ions relative to oxygen octah…

This https://arxiv.org/abs/2303.06701 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_eco…

Composite Sorting
This paper introduces an assignment model with concave costs of skill gaps, which arise generally when firms mitigate costs of mismatch as in Stigler (1939) and Laffont and Tirole (1986, 1991). Concave costs of skill gaps imply that the output function is neither supermodular nor submodular. We thus introduce a tractable model that interpolates between the polar canonical cases of supermodularity and submodularity. We characterize sorting, wages, and comparative statics and show these substanti…

Supersolid Phases in Ultracold Gases of Microwave Shielded Polar Molecules
Wei Zhang, Hongye Liu, Fulin Deng, Kun Chen, Su Yi, Tao Shi
https://arxiv.org/abs/2506.23820

Supersolid Phases in Ultracold Gases of Microwave Shielded Polar Molecules
We propose a novel scheme to realize the supersolid phase in ultracold gases of microwave-shielded polar molecules by engineering an additional anisotropy in inter-molecular dipolar interaction via an elliptically polarized microwave. It is shown through quantum Monte-Carlo calculations that the interplay of the anisotropies between the interaction and trapping potential gives rise to rich quantum phases. Particularly, it is found that the supersolid phase emerges in the parameter regime access…

Rigid affine cones over singular del Pezzo surfaces
In-Kyun Kim, Jaehyun Kim, Joonyeong Won
https://arxiv.org/abs/2506.01310 https://…

Rigid affine cones over singular del Pezzo surfaces
We completely determine the existence of anticanonical polar cylinders in quasi-smooth log del Pezzo surfaces of index one.

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…

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…

Replaced article(s) found for physics.space-ph. https://arxiv.org/list/physics.space-ph/new
[1/1]:
- Jupiter's ultraviolet auroral bridge: the influence of the solar wind on polar auroral morphology
L. A. Head, et al.

Variational first-principles approach to self-trapped polarons
Vasilii Vasilchenko, Matteo Giantomassi, Samuel Ponc\'e, Xavier Gonze
https://arxiv.org/abs/2507.05112

Variational first-principles approach to self-trapped polarons
The behavior of charge carriers in polar materials is governed by electron-phonon interactions, which affect their mobilities via phonon scattering and may localize carriers into self-induced deformation fields, forming self-trapped polarons. We present a first-principles study of self-trapped polaron formation in paradigmatic polar semiconductors and insulators using the variational polaron equations framework and self-consistent gradient optimization. Our method incorporates long-range correc…

Text-Guided Token Communication for Wireless Image Transmission
Bole Liu, Li Qiao, Ye Wang, Zhen Gao, Yu Ma, Keke Ying, Tong Qin
https://arxiv.org/abs/2507.05781

Text-Guided Token Communication for Wireless Image Transmission
With the emergence of 6G networks and proliferation of visual applications, efficient image transmission under adverse channel conditions is critical. We present a text-guided token communication system leveraging pre-trained foundation models for wireless image transmission with low bandwidth. Our approach converts images to discrete tokens, applies 5G NR polar coding, and employs text-guided token prediction for reconstruction. Evaluations on ImageNet show our method outperforms Deep Source C…

Good morning from Copenhagen where it's a beautiful day and I'm off to Brussels to represent @… with our @… friends @… @… @… talking impacts of #ClimateChange in the Polar regions, ice sheets, #biodiversity and sea level rise.
It's apparently #WorldBicycleDay2025 today, but although I normally #cycle to work, today it's just a short tour to the metro station...

Waves in ice
Luke G Bennetts
https://arxiv.org/abs/2505.18635 https://arxiv.org/pdf/2505.18635

Waves in ice
Ocean surface waves can propagate long distances through regions containing floating ice covers. The impacts ocean waves have on the ice covers are of interest in the climate change era, as the polar regions experience pressure from rising temperatures. This chapter provides a review of observations and theoretical models for ocean wave propagation through the marginal ice zone, landfast ice and ice shelves. It traces the historical evolution of the field, from seminal work in the 1970s-80s up …

This https://arxiv.org/abs/2412.11648 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_nuc…

Isotopic Transparency in Central Xe+Sn Collisions at 100 MeV/nucleon
A new method, based on comparing isotopic yield ratios measured at forward and sideward polar angles and on cross-bombarding heavy nuclei with different neutron-to-proton ratios, is used to quantify the stopping power of nuclear matter in heavy-ion collisions. For central collisions of isotopically separated $^{124,129}$Xe+$^{112,124}$Sn at 100~MeV/nucleon bombarding energy, measured with the 4$π$ multidetector INDRA at GSI, a moderate transparency is deduced for hydrogen isotopes, whereas for…

This https://arxiv.org/abs/2412.07868 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Filling the gap in the IERS C01 polar motion series in 1858.9-1860.9
The C01 Earth orientation parameters (EOP) series provided by the International Earth Rotation and Reference Systems Service (IERS) is the longest reliable record of the Earth's rotation. In particular, the polar motion (PM) series beginning from 1846 provides a basis for investigation of the long-term PM variations. However, the pole coordinate $Y_p$ in the IERS C01 PM series has a 2-year gap, which makes this series not completely evenly spaced. This paper presents the results of the first at…

Effective anisotropic interaction potentials for pairs of ultracold molecules shielded by a static electric field
Bijit Mukherjee, Luis Santos, Jeremy M. Hutson
https://arxiv.org/abs/2507.03164

Effective anisotropic interaction potentials for pairs of ultracold molecules shielded by a static electric field
Quantum gases of ultracold polar molecules have novel properties because of the strong dipolar forces between molecules. Current experiments shield the molecules from destructive collisions by engineering long-range repulsive interactions using microwave or static electric fields. These shielding methods produce interaction potentials with large repulsive cores that are not well described with contact potentials. In this paper we explore the anisotropic interaction potentials that arise for pai…

Precise Timing Analysis of Four Magnetic Cataclysmic Variables with TESS
Srinivas M Rao, Jeewan C Pandey, Nikita Rawat, Arti Joshi, Ajay Kumar Singh
https://arxiv.org/abs/2506.04371

Precise Timing Analysis of Four Magnetic Cataclysmic Variables with TESS
We analysed high time-resolution optical photometric data from the Transiting Exoplanet Survey Satellite (TESS) to study the timing behaviour of four intermediate polar-like objects, namely, V1460 Her, 1RXS J045707.4+452751, Swift J0958.0-4208, and V842 Cen. In the case of V1460 Her, we refined the measurement of its orbital period. Long-term observations suggest a gradual decrease in the orbital period of V1460 Her, and the stable light curve during the TESS observations indicates its quiescen…

Hot Phonon Bottlenecks and the Role of Non-Equilibrium Acoustic Phonons in III-V Multi-Quantum Well Systems
Izak Baranowski, Dragica Vasileska, Ian R. Sellers, Stephen M. Goodnick
https://arxiv.org/abs/2507.06455

Hot Phonon Bottlenecks and the Role of Non-Equilibrium Acoustic Phonons in III-V Multi-Quantum Well Systems
The hot phonon bottleneck effect is a promising mechanism for the realization of a true hot carrier solar cell. Prior work has assumed that the acoustic phonons created via decay of polar longitudinal optical (LO) phonons are assumed to quickly leave the system or thermalize quickly due to multi-phonon processes. The present work furthers the models of previous work to include a build-up of longitudinal acoustic phonons in addition to LO phonons due via the Klemens process. By including this ad…

Systematically Measuring Ultra-Diffuse Galaxies. VIII. Misfits, Miscasts, and Miscreants
Dennis Zaritsky, Richard Donnerstein, Donghyeon J. Khim
https://arxiv.org/abs/2505.24755

Systematically Measuring Ultra-Diffuse Galaxies. VIII. Misfits, Miscasts, and Miscreants
We re-examine the 7,070 candidate ultra-diffuse galaxies (UDGs) in the SMUDGes survey and provide classifications based on their visual morphology. Among the more interesting cases, we identify objects along a low surface brightness galaxy merger sequence (ongoing mergers (8) and post-mergers (7)) and a distinct set of dwarf ring galaxies (29). The ring galaxies are hypothesized to be the result of nearly polar-axis collisions, but the responsible companions are undetected. We also highlight ob…

On $C$-Symmetric and $C$-Self-adjoint Unbounded Operators on Hilbert Space
Yury Arlinskii, Konrad Schm\"udgen
https://arxiv.org/abs/2507.01847 https:/…

On $C$-Symmetric and $C$-Self-adjoint Unbounded Operators on Hilbert Space
Let $C$ be a conjugation on a Hilbert space $\cH$. A densely defined linear operator $A$ on $\cH$ is called $C$-symmetric if $CAC\subseteq A^*$ and $C$-self-adjoint if $CAC=A^*$. Our main results describe all $C$-self-adjoint extensions of $A$ on $\cH$. Further, we prove a $C$-self-adjointness criterion based on quasi-analytic vectors and we characterize $C$-self-adjoint operators in terms of their polar decompositions.

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/2502.20495 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Highly Variable Magnetic Pressure-Driven YSO Jets in the Polar Cavity from Toroidal Fields Generated by Inner Disk Accretion
Jets and outflows are commonly observed in young stellar objects (YSOs), yet their origins remain debated. Using 3D non-ideal magnetohydrodynamic (MHD) simulations of a circumstellar disk threaded by a large-scale open poloidal magnetic field, we identify three components in the disk-driven outflow: (1) a fast, collimated jet, (2) a less collimated, slower laminar disk wind, and (3) a magneto-rotational instability (MRI)-active turbulent disk wind that separates the former two. At high altitude…

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…

Only the Ambidextrous Can Flock: Two-dimensional Chiral Malthusian Flocks, Time crystals, and the KPZ Equation
Leiming Chen, Chiu Fan Lee, John Toner
https://arxiv.org/abs/2506.03488

Only the Ambidextrous Can Flock: Two-dimensional Chiral Malthusian Flocks, Time crystals, and the KPZ Equation
We study two-dimensional chiral dry Malthusian flocks; that is, chiral polar-ordered active matter with neither number nor momentum conservation. In the absence of fluctuations, these form a "time crystal", in which the velocity rotates uniformly at a fixed frequency. Fluctuations are described by the (2+1)-Kardar-Parisi-Zhang (KPZ) equation, which implies short-ranged orientational order. For weak chirality, the system is in the linear regime of the KPZ equation for a wide range of length scal…

This https://arxiv.org/abs/2503.09112 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On the Commuting Problem of Toeplitz Operators on the Harmonic Bergman Space
In this paper, we provide a complete characterization of bounded Toeplitz operators $T_f$ on the harmonic Bergman space of the unit disk, where the symbol $f$ has a polar decomposition truncated above, that commute with $T_{z+\bar{g}}$, for a bounded analytic function $g$.

Band-Gap Tunability in Anharmonic Perovskite-like Semiconductors Driven by Polar Electron-Phonon Coupling
Pol Ben\'itez, Ruoshi Jiang, Siyu Chen, Cibr\'an L\'opez, Josep-Llu\'is Tamarit, Edgardo Saucedo, Bartomeu Monserrat, Claudio Cazorla
https://arxiv.org/abs/2506.23167…

Band-Gap Tunability in Anharmonic Perovskite-like Semiconductors Driven by Polar Electron-Phonon Coupling
The ability to finely tune optoelectronic properties in semiconductors is crucial for the development of advanced technologies, ranging from photodetectors to photovoltaics. In this work, we propose a novel strategy to achieve such tunability by utilizing electric fields to excite low-energy polar optical phonon modes, which strongly couple to electronic states in anharmonic semiconductors. We conducted a high-throughput screening of over $10,000$ materials, focusing on centrosymmetric compound…

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…

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…

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…

Iterative Neural Rollback Chase-Pyndiah Decoding
Dmitry Artemasov, Oleg Nesterenkov, Kirill Andreev, Pavel Rybin, Alexey Frolov
https://arxiv.org/abs/2506.04839

Iterative Neural Rollback Chase-Pyndiah Decoding
Iterative decoding is essential in modern communication systems, especially optical communications, where error-correcting codes such as turbo product codes (TPC) and staircase codes are widely employed. A key factor in achieving high error correction performance is the use of soft-decision decoding for component codes. However, implementing optimal maximum a posteriori (MAP) probability decoding for commonly used component codes, such as BCH and Polar codes, is computationally prohibitive. Ins…

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Modeling YSO Jets in 3D I: Highly Variable Asymmetric Magnetic Pressure-Driven Jets in the Polar ...
Yisheng Tu, Zhi-Yun Li, Zhaohuan Zhu, Chun-Yen Hsu, Xiao Hu

Tidal Inflation is Stronger for Misaligned Neptune-Sized Planets Than Aligned Ones
Ritika Sethi, Sarah Millholland
https://arxiv.org/abs/2506.24100 https:/…

Tidal Inflation is Stronger for Misaligned Neptune-Sized Planets Than Aligned Ones
Recent observations have revealed an intriguing abundance of polar-orbiting Neptune-sized planets, many of which exhibit unusually inflated radii. While such misaligned orbits point to a complex dynamical history, the connection between their orbital orientations and planetary structures remains poorly understood. In this study, we analyze a sample of 12 misaligned and 12 aligned planets using structure models that incorporate tidal heating. We use various statistical tests to demonstrate with …

Solar Surface Magnetic Field Simulation from 2010 to 2024 and Anomalous Southern Poleward Flux Transport in Cycle 24
Ruihui Wang, Jie Jiang, Yukun Luo
https://arxiv.org/abs/2506.01416

Solar Surface Magnetic Field Simulation from 2010 to 2024 and Anomalous Southern Poleward Flux Transport in Cycle 24
The solar surface magnetic field is fundamental for modeling the coronal magnetic field, studying the solar dynamo, and predicting solar cycle strength. We perform a continuous simulation of the surface magnetic field from 2010 to 2024, covering solar cycle 24 and the ongoing cycle 25, using the surface flux transport model with assimilated observed active regions (ARs) as the source. The simulation reproduces the evolution of the axial dipole strength, polar field reversal timing, and magnetic…

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…

Trion formation and ordering in the attractive SU(3) Fermi-Hubbard model
Jonathan Stepp, Eduardo Ibarra-Garc\'ia-Padilla, Richard T. Scalettar, Kaden R. A. Hazzard
https://arxiv.org/abs/2506.12300

Trion formation and ordering in the attractive SU(3) Fermi-Hubbard model
Recent advances in microwave shielding have increased the stability and control of large numbers of polar molecules, allowing for the first realization of a molecular Bose-Einstein condensate. Remarkably, it was also recently realized that shielded polar molecules exhibit an SU(N) symmetry among their hyperfine states, opening the door to SU(N) systems with larger N, bosonic particle statistics, and tunable interactions -- both repulsive and attractive. Motivated by these results, we have studi…

Enhancing ferroelectric stability: Wide-range of adaptive control in epitaxial HfO2/ZrO2 superlattices
Jingxuan Li, Shiqing Deng, Liyang Ma, Yangyang Si, Chao Zhou, Kefan Wang, Sizhe Huang, Jiyuan Yang, Yunlong Tang, Yu-Chieh Ku, Chang-Yang Kuo, Yijie Li, Sujit Das, Shi Liu, Zuhuang Chen
https://arxiv.org/abs/2507.00393

Enhancing ferroelectric stability: Wide-range of adaptive control in epitaxial HfO2/ZrO2 superlattices
The metastability of the polar phase in HfO2, despite its excellent compatibility with the complementary metal-oxide-semiconductor process, remains a key obstacle for its industrial applications. Traditional stabilization approaches, such as doping, often induce crystal defects and impose constraints on the thickness of ferroelectric HfO2 thin films. These limitations render the ferroelectric properties vulnerable to degradation, particularly due to phase transitions under operational condition…

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…

Theory of itinerant collisional spin dynamics in nondegenerate molecular gases
Reuben R. W. Wang, John L. Bohn
https://arxiv.org/abs/2505.21896 https://

Theory of itinerant collisional spin dynamics in nondegenerate molecular gases
We study the fully itinerant dynamics of ultracold but nondegenerate polar molecules with a spin-$1/2$ degree of freedom encoded into two of their electric field dressed rotational states. Center of mass molecular motion is constrained to two-dimensions via tight confinement with a one-dimensional optical lattice, but remains mostly unconstrained within the plane. The pseudospins can become entangled through ultracold dipolar collisions, for which the locality of interactions is greatly relaxed…

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 $…

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…