Tootfinder

"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 […]

Spectral Comb Shaping by Polar Codes
Yinuo Mei, Daiming Qu
https://arxiv.org/abs/2506.13230 https://arxiv.org/pdf/2506.13230

Spectral Comb Shaping by Polar Codes
A scheme to select information indices in polar codes is proposed to form signals with spectral comb shapes under BPSK modulation, whereby the signal could be separated from periodic interference in spectrum. By selecting proper indices to load information bits in polar coding, a spectral comb shape signal is formed, which has periodic zeros and notch bands uniformly distributed in its frequency spectrum. Furthermore, to mitigate the negative impact of proposed polar code on the AWGN performanc…

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.

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 […]

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…

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…

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…

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…

High-fidelity quantum state control of a polar molecular ion in a cryogenic environment
Dalton Chaffee, Baruch Margulis, April Sheffield, Julian Schmidt, April Reisenfeld, David R. Leibrandt, Dietrich Leibfried, Chin-Wen Chou
https://arxiv.org/abs/2506.14740

Replaced article(s) found for math.DG. https://arxiv.org/list/math.DG/new
[1/1]:
Hexagonal Circular 3-Webs with Reducible Polar Curves of Degree Three

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

Data from FAST and MeerKAT reviews as a test of radio pulsar physics
F. A. Kniazev, A. Yu. Istomin, V. S. Beskin
https://arxiv.org/abs/2506.12423 https://

Data from FAST and MeerKAT reviews as a test of radio pulsar physics
The data from the FAST and MeerKAT surveys has significantly increased the number of radio pulsars for which the polarization characteristics of their mean profiles have been determined in detail. This has allowed us to confirm earlier conclusions both about the nature of propagation of two orthogonal modes in the pulsar magnetospheres and about the mechanism of particle production in neutron star polar regions and their evolutionary features. We can now say with even greater confidence that me…

SpiralMap: A Python library of the Milky Way's spiral arms
Abhay Kumar Prusty, Shourya Khanna
https://arxiv.org/abs/2506.11383 https://

SpiralMap: A Python library of the Milky Way's spiral arms
We present a library of the major spiral arm models (and maps) of the Galaxy. The package is written in Python, and allows the user to both extract the 2D trace and overplot the spiral arms in Cartesian/Polar coordinates in both Heliocentric (HC) and Galactocentric (GC) frames. The current version is a compilation of 8 models (and maps) covering a range of tracers (stars, gas). Other models can also be added upon request.

Replaced article(s) found for physics.acc-ph. https://arxiv.org/list/physics.acc-ph/new
[1/1]:
Franck-Condon electron emission from polar semiconductor photocathodes

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.

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…

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 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}…

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 …

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…

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…

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…

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 …

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…

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…

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…

(And now @… are less than €19,000 away from their stretch target of € 75,000 to provide @… services to all. Amazing work folks and fedizens 🤩)
#Fediverse is amazing, less than 24 hours after I posted this and @peertube  is only €223 from the penultimate target with 30 hours to go.
Not taking any credit for that, but happy to see a chord has been struck for all genuine surveillance-capital-free social media. Even more important in the time of #NoKings.
Looks like I'm going to be busy making #Science videos on #ClimateChange in the #Polar Regions too for the next few weeks.
Here's one I made earlier on #SurfaceMass Budget. Let me know if there's something #Climate and/or #ice related you'd like to see a short clip about and I'll see what we can do
#fedizens who may not have seen this already? If they make the €55,000 target I promise to write a peertube channel into my next grant proposal, AND I'll post some better quality videos of our Greenland and #Antarctic research over the coming weeks...
Go!
https://support.joinpeertube.org/en/

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…

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…

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 …

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.…

making a splash #PolarBear

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…

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…

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'…

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…

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…

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.

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 …

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 …

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

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/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…

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…

The #Fediverse is amazing, less than 24 hours after I posted this and @… is only €223 from the penultimate target with 30 hours to go.
Not taking any credit for that, but happy to see a chord has been struck for all genuine surveillance-capital-free social media. Even more important in the time of #NoKings.
Looks like I'm going to be busy making #Science videos on #ClimateChange in the #Polar Regions too for the next few weeks.
Here's one I made earlier on #SurfaceMass Budget. Let me know if there's something #Climate and/or #ice related you'd like to see a short clip about and I'll see what we can do
#fedizens who may not have seen this already? If they make the €55,000 target I promise to write a peertube channel into my next grant proposal, AND I'll post some better quality videos of our Greenland and #Antarctic research over the coming weeks...
Go!
#bigTech derisory) amount of EUR 75,000 to develop the opensource #fediverse competitor app to Youtube. Maybe chuck 'em a few euros if you think it useful?
https://support.joinpeertube.org/en/

"World’s largest 1 MW/100 MWh sand battery commissioned in Finland"
#Finland #Energy #Battery #Renewables

World’s largest 1 MW/100 MWh sand battery commissioned in Finland
Finnish startup Polar Night Energy has commissioned the world’s largest sand battery in Pornainen, southern Finland. The industrial-scale system delivers 1 MW of thermal power with 100 MWh storage capacity, covering up to a month’s summer heat demand and nearly a week’s winter demand for the local district heating network.

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…

Check out my walk on Strava.
https://www.strava.com/activities/14629716750

Stroll through the Zoo | Strava
View Falko Zurell's walk on 29. Mai 2025 | Strava

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 …

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…

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…

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.

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…

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…

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/2504.07446 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_nli…

A mass conserved reaction-diffusion system reveals switching between coexisting polar and oscillatory cell motility states
Motile eukaryotic cells display distinct modes of migration that often occur within the same cell type. It remains unclear, however, whether transitions between the migratory modes require changes in external conditions, or whether the different modes are coexisting states that emerge from the underlying signaling network. Using a simplified mass-conserved reaction-diffusion model of small GTPase signaling with F-actin mediated feedback, we uncover a distinct bistable mechanism (involving gradi…

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…

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

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…

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…

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…

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 $g$.

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…

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...

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…