Tootfinder

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

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

Radial Rashba spin-orbit fields in commensurate twisted transition-metal dichalcogenide bilayers
Thomas Naimer, Paulo E. Faria Junior, Klaus Zollner, Jaroslav Fabian
https://arxiv.org/abs/2509.10068

Radial Rashba spin-orbit fields in commensurate twisted transition-metal dichalcogenide bilayers
In commensurate twisted homobilayers, purely radial Rashba spin-orbit fields can emerge. The observed in-plane spin textures are mostly radial, and the main features are successfully reproduced using a model Hamiltonian based on two effective mass models including spin-orbit coupling, and a general (spin-conserving) interlayer coupling. Extracting the model Hamiltonian parameters through fitting of several twisted supercells, we find a twist angle dependency of the magnitude of the radial Rashb…

Climate denial in orbit
https://open.substack.com/pub/talkingclimatenewsletter/p/climate-denial-in-orbit?utm_source=share&utm_medium=android&r=e4myx
> Figs that turn CO2 into ston…

Photo of the moon taken with my iPhone 17 Pro. (No filters)

Orbit-based structural decomposition and stellar population recovery for edge-on barred galaxies
Yunpeng Jin, Ling Zhu, Behzad Tahmasebzadeh, Shude Mao, Glenn van de Ven, Timothy A. Davis
https://arxiv.org/abs/2509.10832

Orbit-based structural decomposition and stellar population recovery for edge-on barred galaxies
In our previous paper, we developed an orbit-superposition method for edge-on barred galaxies, and constructed dynamical models based on different mock observations of three galaxies from the Auriga simulations. In this study, we adopt 12 cases with side-on bars (three simulated galaxies, each with four different projections). We decompose these galaxies into different structures combining the kinematic and morphological properties of stellar orbits, and compare the model-predicted components t…

Orbit method for Quantum Corner Symmetries
Giulio Neri, Ludovic Varrin
https://arxiv.org/abs/2507.10683 https://arxiv.org/pdf/2507.10…

Orbit method for Quantum Corner Symmetries
The classification of the unitary irreducible representations of symmetry groups is a cornerstone of modern quantum physics, as it provides the fundamental building blocks for constructing the Hilbert spaces of theories admitting these symmetries. In the context of gravitational theories, several arguments point towards the existence of a universal symmetry group associated with corners, whose structure is the same for every diffeomorphism-invariant theory in any dimension. Recently, the repr…

Genus stabilization for the homology of moduli spaces of orbit-framed curves with symmetries-I
Fabrizio Catanese, Michael Loenne, Fabio Perroni
https://arxiv.org/abs/2508.10199 …

Genus stabilization for the homology of moduli spaces of orbit-framed curves with symmetries-I
In a previous paper, arXiv:1301.4409, we showed that the moduli space of curves C with a G-symmetry (that is, with a faithful action of a finite group G), having a fixed generalized homological invariant, is irreducible if the genus g' of the quotient curve C' : = C/G satisfies g'>>0. Interpreting this result as stabilization for the 0-th homology group of the moduli space of curves with G-symmetry, we begin here a program for showing stabilization for all the homology groups of these spaces,…

Today we had to say goodbye to Orbit the cat. He came to us needing a temporary home when he was 2.5 years old, and lived to be 20! A handsome creature, but it must be said that he was not the sharpest tool in the box!! We'll miss our little friend but it was time. Sleep well, puss.

On $q$-analogs of the $3x 1$ Dynamical System
Kenneth G. Monks
https://arxiv.org/abs/2508.10153 https://arxiv.org/pdf/2508.10153

On $q$-analogs of the $3x+1$ Dynamical System
The $3x+1$ Conjecture asserts that the $T$-orbit of every positive integer $x$ contains $1$, where $T$ maps $x$ to $x/2$ for $x$ even and to $(3x+1)/2$ for $x$ odd. Several authors have studied the analogous map, $T_q$, which maps $x\in F_2[q]$ to $x/q$ if $q$ divides $x$ and $((1+q)x+1)/q$ otherwise. In particular, they showed that the $T_q$-orbit of every polynomial contains $1$. This seems analogous to the $3x+1$ conjecture, but does not prove the conjecture itself, as the dynamical systems …

An Orbit-qubit Quantum Processor of Ultracold Atoms
Ming-Gen He, Wei-Yong Zhang, Zhen-Sheng Yuan, Jian-Wei Pan
https://arxiv.org/abs/2509.10797 https://arx…

An Orbit-qubit Quantum Processor of Ultracold Atoms
It is challenging to build scalable quantum processors capable of both parallel control and local operation. As a promising platform to overcome this challenge, optical lattices offer exceptional parallelism. However, it has been struggling with precise local operations due to relatively narrow lattice spacings. Here, we introduce a new quantum processor incorporating orbit-qubit encoding and internal states (as auxiliary degrees of freedom) to achieve spatially selective operations together wi…

The MIRI Excesses around Degenerates (MEAD) Survey I: A candidate cold brown dwarf in orbit around the nearby white dwarf 2MASS J09424023-4637176
Lo\"ic Albert (D\'epartement de Physique and Observatoire du Mont-M\'egantic, Universit\'e de Montr\'eal, Trottier Institute for Research on Exoplanets), Sabrina R. Poulsen (Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma), \'Erika Le Bourdais (D\'epartement de physique and Institut Trot…

The MIRI Excesses around Degenerates (MEAD) Survey I: A candidate cold brown dwarf in orbit around the nearby white dwarf 2MASS J09424023-4637176
The MIRI Excesses Around Degenerates Survey is a Cycle 2 James Webb Space Telescope (JWST) Survey program designed to image nearby white dwarfs in the mid-IR with the MIRI imaging mode. Only a handful of white dwarfs have previously been observed beyond 8~\micron. This survey gathered observations for 56 white dwarfs within 25~pc at 10 and 15~\micron, probing each white dwarf for unresolved IR excesses, IR flux deficits indicative of collision induced absorption, or resolved substellar companio…

Vanishing Signatures, Orbit Closure, and the Converse of the Holant Theorem
Jin-Yi Cai, Ben Young
https://arxiv.org/abs/2509.10991 https://arxiv.org/pdf/25…

Vanishing Signatures, Orbit Closure, and the Converse of the Holant Theorem
Valiant's Holant theorem is a powerful tool for algorithms and reductions for counting problems. It states that if two sets $\mathcal{F}$ and $\mathcal{G}$ of tensors (a.k.a. constraint functions or signatures) are related by a \emph{holographic transformation}, then $\mathcal{F}$ and $\mathcal{G}$ are \emph{Holant-indistinguishable}, i.e., every tensor network using tensors from $\mathcal{F}$, resp. from $\mathcal{G}$, contracts to the same value. Xia (ICALP 2010) conjectured the converse of t…

Constraining Earth’s orbital capacity via operational feasibility: #LEO ist voll - neue Studie zeigt, wo der Orbit seine Belastungsgrenze erreicht hat: https://t3n.de/news/neue-studie-leo-orbit-erreicht-belastungsgrenze-1712012/

In-orbit Spectral Calibration Prospects for the COSI Space Telescope
Aravind B. Valluvan, Steven E. Boggs, Savitri Gallego, Jarred Roberts, Gabriel Brewster, Sophia Haight, Carolyn Kierans, Sean Pike, Albert Y. Shih, John A. Tomsick, Andreas Zogaluer
https://arxiv.org/abs/2508.10172

In-orbit Spectral Calibration Prospects for the COSI Space Telescope
The Compton Spectrometer and Imager is an upcoming NASA space telescope in the MeV range. COSI's primary science goals include precisely mapping nuclear line and positron annihilation emission in the Milky Way galaxy through Compton imaging. This relies on our ability to maintain COSI's spectral performance over its mission lifetime. Changes to the detectors' gain characteristics over time will result in a non-linear stretching of the entire energy range. Moreover, observations from past MeV te…

Limits of Standard Tidal Models at Quaoar: Matching Weywot's Orbit, Missing the Spin
Zsolt Regaly, Viktoria Frohlich ang Csaba Kiss
https://arxiv.org/abs/2510.12495 https://…

Limits of Standard Tidal Models at Quaoar: Matching Weywot's Orbit, Missing the Spin
Weywot, Quaoar's small satellite, follows a nearly circular orbit at a distance of 12.9 times Quaoar's diameter and coexists with a compact ring system. Nevertheless, Quaoar's flattening of 0.16, slow 17.7hr rotation and Weywot's low mass are difficult to reconcile with conventional tidal-evolution theory. We assess whether standard tides can reproduce the present-day architecture of the Quaoar-Weywot system and identify the initial conditions required. Orbit-averaged integrations spanning 4.5G…

Understanding variations of galactic energetic particles in the heliosphere: modelling and radiation hazard assessment
Miguel Orcinha, Fernando Bar\~ao, Bruna Bertucci, Emanuele Fiandrini, David Pelosi, Nicola Tomassetti
https://arxiv.org/abs/2509.11837

Understanding variations of galactic energetic particles in the heliosphere: modelling and radiation hazard assessment
The intensity and energy spectrum of energetic charged radiation in the heliosphere are significantly influenced by solar activity. This phenomenon is known as solar modulation of galactic cosmic rays. As interplanetary travel becomes a reality, missions in low Earth orbit become longer and more frequent. In low Earth orbit we need to estimate the influence of Earth's magnetosphere accurately to assess the radiation hazard experienced by astronauts during space missions, there is an emergent …

Brownian motion and orbit counting of Kleinian groups
Yanlong Hao, Beibei Liu
https://arxiv.org/abs/2508.09807 https://arxiv.org/pdf/2508.09807

Brownian motion and orbit counting of Kleinian groups
In this paper, we investigate the relationship between the divergence of Kleinian groups $Γ$ and the recurrence of simple random walks on the Schreier graph associated with $Γ$. In particular, we show that if $Γ$ is a subgroup of a lattice and is of divergence type, then the Schreier graph is recurrent. Our approach builds connections among the growth rate of the $Γ$-orbit, the volume growth rate of the quotient manifolds, and the growth rate of the Schreier graph. Using the connections, we…

TLE-Based A2C Agent for Terrestrial Coverage Orbital Path Planning
Anantha Narayanan, Battu Bhanu Teja, Pruthwik Mishra
https://arxiv.org/abs/2508.10872 https://

TLE-Based A2C Agent for Terrestrial Coverage Orbital Path Planning
The increasing congestion of Low Earth Orbit (LEO) poses persistent challenges to the efficient deployment and safe operation of Earth observation satellites. Mission planners must now account not only for mission-specific requirements but also for the increasing collision risk with active satellites and space debris. This work presents a reinforcement learning framework using the Advantage Actor-Critic (A2C) algorithm to optimize satellite orbital parameters for precise terrestrial coverage wi…

Reinforcement-Learning-Designed Field-Free Sub-Nanosecond Spin-Orbit-Torque Switching
Yuta Igarashi, Junji Fujimoto
https://arxiv.org/abs/2508.10792 https://

Reinforcement-Learning-Designed Field-Free Sub-Nanosecond Spin-Orbit-Torque Switching
We demonstrate deterministic, field-free magnetization reversal of a single-domain nanomagnet within 300 ps under a current density of $3 \times 10^{10}~\mathrm{A/m^2}$ by coupling reinforcement learning (RL) to the Landau-Lifshitz-Gilbert equation with the spin-orbit torques (SOTs). The RL agent autonomously discovers a current waveform that minimizes the magnetization trajectory path and exploits a precessional shortcut enabled by the field-like SOT and hard-axis anisotropy. From the learned …

Amazon's Kuiper launches 24 satellites via SpaceX's Falcon 9 after four launch attempts were delayed by weather issues, taking its total to 102 in orbit (Annie Palmer/CNBC)
https://www.cnbc.com/2025/08/11/amazon-kuiper-internet-satellites-launch.html

Amazon tops 100 satellites after weather-delayed Kuiper launch
A SpaceX-owned Falcon 9 rocket carried 24 more Kuiper satellites into low-earth orbit, bringing Amazon's constellation to 102 satellites.

Phase transitions and dynamics of one-dimensional solitons in spin-orbit-coupled Bose-Bose mixtures
Gui-hua Chen, Hongcheng Wang, Boris A. Malomed, Haiming Deng, Yongyao Li
https://arxiv.org/abs/2508.10632

Phase transitions and dynamics of one-dimensional solitons in spin-orbit-coupled Bose-Bose mixtures
We investigate the formation, stability, and dynamics of solitons in a one-dimensional binary Bose-Einstein condensate under the action of the spin-orbit-coupling (SOC) and Lee-Huang-Yang (LHY) correction to the underlying system of the Gross-Pitaevskii equations. We identify the semi-dipole (SD) family of solitons and thoroughly analyze its properties. The numerical analysis reveals intricate bifurcations, including transitions from real to complex-valued stationary wavefunctions of the SD sol…

Integrated Communication and Remote Sensing in LEO Satellite Systems: Protocol, Architecture and Prototype
Yichao Xu, Xiaoming Chen, Ming Ying, Zhaoyang Zhang
https://arxiv.org/abs/2508.10317

Integrated Communication and Remote Sensing in LEO Satellite Systems: Protocol, Architecture and Prototype
In this paper, we explore the integration of communication and synthetic aperture radar (SAR)-based remote sensing in low Earth orbit (LEO) satellite systems to provide real-time SAR imaging and information transmission. Considering the high-mobility characteristics of satellite channels and limited processing capabilities of satellite payloads, we propose an integrated communication and remote sensing architecture based on an orthogonal delay-Doppler division multiplexing (ODDM) signal wavefor…

Dirty Bits in Low-Earth Orbit: The Carbon Footprint of Launching Computers
Robin Ohs, Gregory F. Stock, Andreas Schmidt, Juan A. Fraire, Holger Hermanns
https://arxiv.org/abs/2508.06250

Dirty Bits in Low-Earth Orbit: The Carbon Footprint of Launching Computers
Low-Earth Orbit (LEO) satellites are increasingly proposed for communication and in-orbit computing, achieving low-latency global services. However, their sustainability remains largely unexamined. This paper investigates the carbon footprint of computing in space, focusing on lifecycle emissions from launch over orbital operation to re-entry. We present ESpaS, a lightweight tool for estimating carbon intensities across CPU usage, memory, and networking in orbital vs. terrestrial settings. Thre…

On Sets of Periodic Orbit Lengths in Finitely Presented Dynamical Systems
Huub de Jong
https://arxiv.org/abs/2510.10848 https://arxiv.org/pdf/2510.10848

On Sets of Periodic Orbit Lengths in Finitely Presented Dynamical Systems
We classify the sets of natural numbers $n$ for which certain dynamical systems $(X,f)$ on a compact metric space $X$ have a periodic point of (least) period $n$. Interest in this question dates back to Sharkovskii's theorem for continuous maps on intervals of the real line, but it also ties to checkable conditions for Krieger's embedding theorem for symbolic dynamical systems. Given a system for which the logarithmic derivative of the Artin-Mazur zeta function is rational, we use the Skolem-Ma…

Catalog and Characterization of Science Orbit Configurations for an Enceladus Orbiter
Spencer Boone, Joan Pau Sanchez Cuartialles, St\'ephanie Lizy-Destrez
https://arxiv.org/abs/2510.12421

Catalog and Characterization of Science Orbit Configurations for an Enceladus Orbiter
Saturn's moon Enceladus is an exciting destination for future exploration missions due to the scientifically interesting geyser region located on its South pole. In this work, we compile the different types of science orbit configurations that have been proposed in the literature and present numerical methods to compute each of them in the Saturn-Enceladus circular restricted three-body problem (CR3BP). In addition, we explore the utility of the higher period dynamical structures found in the C…

Secure and Scalable Rerouting in LEO Satellite Networks
Lyubomir Yanev, Pietro Ronchetti, Joshua Smailes, Martin Strohmeier
https://arxiv.org/abs/2509.10173 https://

Secure and Scalable Rerouting in LEO Satellite Networks
Resilient routing in large-scale Low Earth Orbit (LEO) satellite networks remains a key challenge due to frequent and unpredictable link and node failures, potentially in response to cybersecurity breaches. While prior work has explored rerouting strategies with various levels of network awareness, their relative tradeoffs under dynamic failure conditions remain underexplored. In this work, we extend the Deep Space Network Simulator (DSNS) to systematically compare three rerouting paradigms, ea…

Squirrels at War: Intrusion
#writingcommunity #visualinspiration Earlier installments can be read from this page. *** The Ilyrians had entered the system beyond the orbit of Blyss, so the signal, traveling at light speed, was 30 minutes old. Mac explained that Oran had…

Observable thin accretion disk around a self-dual black hole in loop quantum gravity
Tursunali Xamidov, Javokhir Sharipov, Sanjar Shaymatov
https://arxiv.org/abs/2509.10953 http…

Observable thin accretion disk around a self-dual black hole in loop quantum gravity
In this paper, we study a self-dual black hole (BH) in Loop Quantum Gravity (LQG), analyzing both timelike and null geodesics. Using observational data from Mercury's perihelion shift and the orbit of the S2 star around Sagittarius A$^{\star}$ (Sgr A$^{\star}$), we derive constraints on the polymeric function $P$. We further investigate photon trajectories near the self-dual BH under various scenarios to explore their observational relevance. Finally, we examine the properties of accretion disk…

Measuring the mean plane of the distant Kuiper belt: #KuiperBelt Hints at an Unseen Planet: https://eos.org/articles/a-survey-of-the-kuiper-belt-hints-at-an-unseen-planet - an analysis of more than 150 objects in the far reaches of the solar system suggests that a planet more massive than Mercury could be lurking beyond the orbit of Pluto.

A linear-time algorithm for Chow decompositions
Alexander Taveira Blomenhofer, Benjamin Lovitz
https://arxiv.org/abs/2509.10450 https://arxiv.org/pdf/2509.…

A linear-time algorithm for Chow decompositions
We propose a linear-time algorithm to compute low-rank Chow decompositions. Our algorithm can decompose concise symmetric 3-tensors in n variables of Chow rank n/3. The algorithm is pencil based, hence it relies on generalized eigenvalue computations. We also develop sub-quadratic time algorithms for higher order Chow decompositions, and Chow decompositions of 3-tensors into products of linear forms which do not lie on the generic orbit. In particular, we obtain a sub-quadratic-time algorithm f…

Intrinsic Quantum Clusters in Kagome Weyl Semimetal Co3Sn2S2
Yuqing Xing, Hui Chen, Li Huang, Roger Guzman, Qi Zheng, Senhao Lv, Jinan Shi, Haitao Yang, Wu Zhou, Hong-Jun Gao
https://arxiv.org/abs/2509.11230

Intrinsic Quantum Clusters in Kagome Weyl Semimetal Co3Sn2S2
Impurities and intrinsic point defects, which profoundly influence spin, charge, and topological degrees of freedom, are crucial parameters for tuning quantum states in quantum materials. The magnetic Weyl semimetal Co3Sn2S2 with its strong spin-orbit coupling, intrinsic ferromagnetism, and kagome lattice of correlated electrons, provides a compelling platform for studying impurity excited states. Yet, the role of intrinsic impurities in shaping its quantum states remains elusive. Here, we unco…

Spin ladder quantum simulators from spin-orbit-coupled quantum dot spin qubits
Yang-Zhi Chou, Sankar Das Sarma
https://arxiv.org/abs/2508.08358 https://arx…

Spin ladder quantum simulators from spin-orbit-coupled quantum dot spin qubits
Motivated by the recent Ge hole spin qubit experiments, we construct and study a two-leg spin ladder from a quantum dot array with spin-orbit couplings (SOCs), aiming to uncover the many-body phase diagrams and provide concrete guidance for the Ge hole spin qubit experiments. The spin ladder is described by an unprecedented, complex spin Hamiltonian, which contains antiferromagnetic Heisenberg exchange, Dzyaloshinskii-Moriya (DM), and anisotropic exchange interactions. We analyze the spin ladde…

A Transiting Giant on a 7.7-Year Orbit Revealed by TTVs in the TOI-201 System
Gracjan Maciejewski, Weronika {\L}oboda
https://arxiv.org/abs/2507.11504 http…

A Transiting Giant on a 7.7-Year Orbit Revealed by TTVs in the TOI-201 System
We report the detection and characterization of TOI-201 c, a long-period transiting companion to the warm Jupiter TOI-201 b. Its presence was first inferred from high-amplitude transit timing variations (TTVs) in TOI-201 b, pointing to a massive outer body on a $7.7^{+1.0}_{-0.6}$-year eccentric orbit. This prediction was confirmed when TESS observed a transit of TOI-201 c, precisely constraining its orbital geometry. A joint fit to TTVs, transit photometry, and archival radial velocities yield…

In science, a model reveals universal laws. In AI, a “model” just matches patterns in data. Copernicus knew the difference but transformers don't, as reflected in this Harvard/MIT study https://blog.still-water.net/ptolemaic-thinking-in-ai-age

Series D, Episode 11 - Orbit
TARRANT: Yeah, very interesting. After he vanished, they started finding the bodies. He was never a simple scientist, Avon.
VILA: What was he?
https://blake.torpidity.net/m/411/245 B7B3

Nicht von dieser Welt: Wie Jeff Bezos sich KI-Datenzentren der Zukunft vorstellt
Der KI-Boom erfordert immer mehr Rechenzentren mit hohem Energiebedarf. Jeff Bezos sieht die Zukunft nicht in Atomstrom, sondern in Solarenergie im Orbit.

Replaced article(s) found for physics.atom-ph. https://arxiv.org/list/physics.atom-ph/new
[1/1]:
- Experimental realization of a SU(3) color-orbit coupling in an ultracold gas
Madasu, Mitra, Gabardos, Rathod, Zanon-Willette, Miniatura, Chevy, Kwong, Wilkowski

Removing 50 Objects from Orbit Would Cut Danger From Space Junk in Half - Slashdot
https://science.slashdot.org/story/25/10/06/0148246/removing-50-objects-from-orbit-would-cut-danger-from-space-junk-in-half

Nonlinear periodic orbit solutions and their bifurcation structure at the origin of soliton hopping in coupled microresonators
Savyaraj Deshmukh, Aleksandr Tusnin, Alexey Tikan, Tobias J. Kippenberg, Tobias M. Schneider
https://arxiv.org/abs/2508.09921

Nonlinear periodic orbit solutions and their bifurcation structure at the origin of soliton hopping in coupled microresonators
Microresonator frequency combs, essential for future integrated optical systems, rely on dissipative Kerr solitons generated in a single microresonator to achieve coherent frequency comb generation. Recent advances in the nanofabrication of low-loss integrated nonlinear microresonators have paved the way for the exploration of coupled-resonator systems. These systems provide significant technological advantages, including higher conversion efficiency and the generation of dual dispersive waves.…

Families of curves in Vinberg representations
Jef Laga, Beth Romano
https://arxiv.org/abs/2508.09607 https://arxiv.org/pdf/2508.09607

Families of curves in Vinberg representations
Inspired by orbit parametrizations in arithmetic statistics, we explain how to construct families of curves associated to certain nilpotent elements in $\mathbb{Z}/m\mathbb{Z}$-graded Lie algebras, generalizing work of Thorne to the $m\geq 3$ case and the non-simply laced case. We classify such families arising from subregular nilpotents in stable gradings and interpret almost all orbit parametrizations associated with algebraic curves appearing in the literature in this framework. As an extend…

Orbit lengths for promotion on 2-row and near-hook tableaux
Laura Pierson
https://arxiv.org/abs/2510.03671 https://arxiv.org/pdf/2510.03671

Orbit lengths for promotion on 2-row and near-hook tableaux
Promotion has been well-studied for rectangular standard Young tableaux, in which case the orbit lengths divide the total number of boxes and are described by a cyclic sieving phenomenon (CSP), but little is known about the orbit lengths for tableaux of general shape. We approach this problem by building a stable sequence of tableaux where we fix the bottom portion and add extra boxes to the first row to get $n$ total boxes, with $n$ varying. We show that for 2-row tableaux with a fixed bottom …

Exchange and spin-orbit proximity driven topological and transport phenomena in twisted graphene/CrI$_3$ heterostructures
M. Jafari, M. Gmitra, A. Dyrda{\l}
https://arxiv.org/abs/2509.11670

Exchange and spin-orbit proximity driven topological and transport phenomena in twisted graphene/CrI$_3$ heterostructures
We present results of comprehensive first-principles and kp-method studies of electronic, magnetic, and topological properties of graphene on a monolayer of CrI$_3$. First, we identify a twist angle between the graphene and CrI$_3$, that positions the graphene Dirac cones within the bandgap of CrI$_3$. Then, we derive the low-energy effective Hamiltonian describing electronic properties of graphene Dirac cones. Subsequently, we examine anomalous and valley Hall conductivity and discuss possible…

Satellites are closer than you think: A near field MIMO approach for Ground stations
Rohith Reddy Vennam, Luke Wilson, Ish Kumar Jain, Dinesh Bharadia
https://arxiv.org/abs/2508.09374

Satellites are closer than you think: A near field MIMO approach for Ground stations
The rapid growth of low Earth orbit (LEO) satellite constellations has revolutionized broadband access, earth observation, and direct-to-device connectivity. However, the expansion of ground station infrastructure has not kept pace, creating a critical bottleneck in satellite-to-ground backhaul capacity. Traditional parabolic dish antennas, though effective for geostationary (GEO) satellites, are ill-suited for dense, fastmoving LEO networks due to mechanical steering delays and their inability…

Effects of Small-Chain Superexchange Dynamics on Spin-Orbit Coupled Clock Spectroscopy
Mikhail Mamaev, Ana Maria Rey, William R. Milner
https://arxiv.org/abs/2507.11433

Effects of Small-Chain Superexchange Dynamics on Spin-Orbit Coupled Clock Spectroscopy
Optical lattice clocks have set records in clock precision and accuracy. Continuing to advance their performance, via probing as many atoms for the longest interrogation time affordable, requires experimentally and theoretically studying a many-body lattice system. Motivated by recent experimental results on a Fermi-degenerate three-dimensional optical lattice clock, we present a theoretical overview of Ramsey and Rabi spectroscopy in one-dimensional chains. At realistic experimental temperatur…

Optimal Transport on Lie Group Orbits
Bahar Taskesen
https://arxiv.org/abs/2508.09377 https://arxiv.org/pdf/2508.09377

Optimal Transport on Lie Group Orbits
In its most general form, the optimal transport problem is an infinite-dimensional optimization problem, yet certain notable instances admit closed-form solutions. We identify the common source of this tractability as symmetry and formalize it using Lie group theory. Fixing a Lie group action on the outcome space and a reference distribution, we study optimal transport between measures lying on the same Lie group orbit of the reference distribution. In this setting, the Monge problem admits an …

Evaluating Earth-Observing Satellite Sampling Effectiveness Using Kullback-Leibler Divergence
Negin Esmaeili, Paul T. Grogan
https://arxiv.org/abs/2510.10859 https://

Evaluating Earth-Observing Satellite Sampling Effectiveness Using Kullback-Leibler Divergence
This work presents an objective, repeatable, automatic, and fast methodology for assessing the representativeness of geophysical variables sampled by Earth-observing satellites. The primary goal is to identify and mitigate potential sampling biases attributed to orbit selection during pre-Phase A mission studies. This methodology supports current incubation activities for a future Planetary Boundary Layer observing system by incorporating a sampling effectiveness measure into a broader architec…

Near-realtime Earth Observation Via Starlink LEO Satellite Constellation
Bo Wu (University of Pittsburgh), Pengfei Zhou (University of Pittsburgh)
https://arxiv.org/abs/2508.10338

Near-realtime Earth Observation Via Starlink LEO Satellite Constellation
Earth observation (EO) satellites in Low Earth Orbit (LEO) are collecting vast amounts of data, which are invaluable for applications such as monitoring forest fires. However, data downloading from EO satellites faces significant challenges due to the limited number of ground stations and the brief communication windows with them. Conversely, emerging LEO constellations like Starlink have enabled continuous connectivity and revolutionized access for ordinary users globally, who can connect via …

Invariant sets for the wind-tree model
Yuriy Tumarkin
https://arxiv.org/abs/2510.10760 https://arxiv.org/pdf/2510.10760

Invariant sets for the wind-tree model
We consider the wind-tree model, a $\mathbb{Z}^2$ - periodic billiard. In the case when the underlying compact translation surface lies on a periodic orbit of the Teichmüller geodesic flow, and at least one of the two homology classes defining the $\mathbb{Z}^2$ - cover is unstable for the Kontsevich-Zorich cocycle, we prove that every orbit closure of the billiard has Hausdorff dimension strictly smaller than 2. The proof relies on a construction of explicit invariant functions, which along t…

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

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

Early Stages of Dusty Tori: The First Infrared Spectra from a Highly Multiscale Quasar Simulation
Jaeden Bardati, Philip F. Hopkins, Gordon T. Richards
https://arxiv.org/abs/2509.09770

Early Stages of Dusty Tori: The First Infrared Spectra from a Highly Multiscale Quasar Simulation
We present the first infrared spectral predictions from a self-consistent simulation of the formation of a quasar in a starburst galaxy, spanning cosmological to innermost stable circular orbit (ISCO) scales. The infrared emission is dominated by a torus-like dust structure composed of the highly magnetized, turbulence-supported outer accretion disk and of accreting gas tidally torn from the interstellar medium (ISM). At these early stages, the AGN is buried and Compton-thick. The near- to mid-…

Replaced article(s) found for cond-mat.str-el. https://arxiv.org/list/cond-mat.str-el/new
[1/2]:
- Correlated Phases in Spin-Orbit-Coupled Rhombohedral Trilayer Graphene
Jin Ming Koh, Jason Alicea, \'Etienne Lantagne-Hurtubise

Large Chern-Number Quantum Anomalous Hall Effect from Canted Antiferromagnetic Order in $d$-Electron System on Kagome Lattice
Waquar Ahmed, Steffen Schaeffer, Pierre Lombardo, Roland Hayn, Imam Makhfudz
https://arxiv.org/abs/2509.10976

Large Chern-Number Quantum Anomalous Hall Effect from Canted Antiferromagnetic Order in $d$-Electron System on Kagome Lattice
Electrons of $d$-symmetry in a kagome lattice are considered which interact with non-collinear antiferromagnetic order in the absence of spin-orbit coupling. The non-collinearity of spin texture gives rise to non-relativistic spin splitting and the associated intrinsic Berry curvature. The integral of the latter over the Brillouin zone becomes nontrivial for non-coplanar (canted) non-collinear spin order even without explicit on-site or transfer spin-orbit coupling. That gives rise to a nonzero…

Orbit recovery for spherical functions
Tamir Bendory, Dan Edidin, Josh Katz, Shay Kreymer
https://arxiv.org/abs/2508.02674 https://arxiv.org/pdf/2508.02674…

Orbit recovery for spherical functions
Orbit recovery is a central problem in both mathematics and applied sciences, with important applications to structural biology. This paper focuses on recovering generic orbits of functions on ${\mathbb R}^{n}$ and the sphere $S^{n-1}$ under the rotation action of $SO(n)$. Specifically, we demonstrate that invariants of degree three (called the bispectrum) suffice to recover generic orbits of functions in finite-dimensional approximations of $L^2({\mathbb R}^n)$ obtained by band-limiting the sp…

The Perturbation Theory Approach to Stability in the Scattered Disk
Matthew Belyakov, Konstantin Batygin
https://arxiv.org/abs/2508.10119 https://arxiv.org…

The Perturbation Theory Approach to Stability in the Scattered Disk
Scattered disk objects (SDOs) are distant minor bodies that orbit the sun on highly eccentric orbits, frequently with perhelia near Neptune's orbit. Gravitational perturbations due to Neptune frequently lead to chaotic dynamics, with the degree of chaotic diffusion set by an object's perihelion distance. Batygin et al. (2021) developed a perturbative approach for scattered disk dynamics, finding that, to leading order in semi-major axis ratio, an infinite series of $2:j$ resonances drives the d…

I just saw an animation showing the evolution of the number of artificial satellites in orbit around Earth:
- 1957: 1
- 1960: 10
- 1965: 100
- 1996: 1'000
- 2016: 2'000
- 2024: 10'000
- 2025: 14'000

Spin Fluctuations-induced Unconventional Transverse Spin Current in Spin Degenerate Antiferromagnet
Cuimei Cao, Meng Zhu, Shiwei Chen, Yizhuo Song, Xiaoyu Feng, Zhenzhong Yang, Yihan Wang, Shiheng Liang, Qingfeng Zhan, Jia Zhang, Long You
https://arxiv.org/abs/2510.09964

Spin Fluctuations-induced Unconventional Transverse Spin Current in Spin Degenerate Antiferromagnet
Modern magnetic memory technology requires unconventional transverse spin current to achieve deterministic switching of perpendicular magnetization. Spin current in antiferromagnets (AFMs) has been long thought to be trivial as nonmagnets. Recently, a class of spin-splitting AFMs has been shown to be able to generate unconventional spin current for spin-orbit torque (SOT) applications. However, such AFMs requires specific symmetry breaking, and have been largely restricted by the limited materi…

RE: https://mastodon.social/@badastro/115350341474213632
This is a cute little piece. Great in particular if you plan to write some Martian science fiction with scenes set at the surface of the planet. Or on one of the moons. Or in orbit.

Tidal Triggering of Magnitude 7 Earthquakes by Jupiter
E. W. Holt, Eric Newman
https://arxiv.org/abs/2508.07064 https://arxiv.org/pdf/2508.07064

Tidal Triggering of Magnitude 7+ Earthquakes by Jupiter
This work uses a chi-squared test of independence to determine if days that include earthquakes greater than or equal to magnitude 7 (M7+) from 1960 to 2024 are truly independent of the position of Earth in its orbit around the sun. To this end, this study breaks up Earth's orbit into days offset on either side of two reference Earth-Sun-Planet orientations, or zero-points: opposition and inferior conjunction. A computer program is used to sample U.S.G.S. earthquake and N.A.S.A. Horizons epheme…

Series C, Episode 05 - The Harvest of Kairos
ZEN: Unchanged.
TARRANT: So, we have five minutes before they link, four while they transfer cargo, less than twelve before they break orbit.
VILA: Bit of a know-all, aren't you? [Tarrant winks and smiles.]
https://blake.torpidity.net/m/305/230

Stable High-Order Vortices in Spin-Orbit-Coupled Spin-1 Bose-Einstein Condensates
Xin-Feng Zhang, Huan-Bo Luo, Josep Batle, Bin Liu, Yongyao Li
https://arxiv.org/abs/2510.09832 …

Stable High-Order Vortices in Spin-Orbit-Coupled Spin-1 Bose-Einstein Condensates
The present contribution explores phase transitions that occur in the ground state (GS) of spin-1 Bose-Einstein condensates (BECs) with spin-orbit coupling (SOC) under the action of gradient magnetic fields. By solving the corresponding linearized system in an exact fashion, we identify the conditions under which the GS phase transitions occur, thus transforming excited states into GS. The study of the full nonlinear system, including both density-density and spin-spin interactions, is …

Outer length billiards on polygons
Lael Edwards-Costa
https://arxiv.org/abs/2510.11869 https://arxiv.org/pdf/2510.11869

Outer length billiards on polygons
The classical inner and outer billiards can be formulated in variational terms, with length and area as the respective generating functions. The other two combinations, ``inner with area'' and ``outer with length,'' are more recently described. Here, we consider the latter system in the special case of polygonal tables. We describe the behavior of orbits far away from the table and pose conjectures regarding an escaping orbit when the table is a square. This paper is meant to complement arXiv:2…

Algebraic hyperbolicity of adjoint linear systems on spherical varieties
Minseong Kwon, Haesong Seo
https://arxiv.org/abs/2508.09414 https://arxiv.org/pdf/…

Algebraic hyperbolicity of adjoint linear systems on spherical varieties
Moraga and Yeong conjectured that for a smooth complex projective variety $X$ of dimension $n$, an ample line bundle $A$ on $X$ and an integer $m \ge 3 n + 1$, very general elements of the adjoint linear system $|ω_{X} \otimes A^{\otimes m}|$ are algebraically hyperbolic. We prove the conjecture for spherical varieties with smooth orbit closures. As a corollary, we conclude that the conjecture holds for horospherical varieties, and for toroidal spherical varieties. Furthermore, for a…

Joint Antenna Positioning and Beamforming for Movable Antenna Array Aided Ground Station in Low-Earth Orbit Satellite Communication
Jinming Wang, Lipeng Zhu, Shuai Han, He Sun, Rui Zhang
https://arxiv.org/abs/2509.07511

Joint Antenna Positioning and Beamforming for Movable Antenna Array Aided Ground Station in Low-Earth Orbit Satellite Communication
This paper proposes a new architecture for the low-earth orbit (LEO) satellite ground station aided by movable antenna (MA) array. Unlike conventional fixed-position antenna (FPA), the MA array can flexibly adjust antenna positions to reconfigure array geometry, for more effectively mitigating interference and improving communication performance in ultra-dense LEO satellite networks. To reduce movement overhead, we configure antenna positions at the antenna initialization stage, which remain un…

Geometric models and asymptotic dimension for infinite-type surface mapping class groups
Michael C. Kopreski, George Shaji
https://arxiv.org/abs/2508.06679 https://

Geometric models and asymptotic dimension for infinite-type surface mapping class groups
Let $S$ be an infinite-type surface and let $G \leq \operatorname{Map}(S)$ be a locally bounded Polish subgroup. We construct a metric graph $M$ of simple arcs and curves on $S$ preserved by the action of $G$ and for which the vertex orbit map $G \to V(M)$ is a coarse equivalence; if $G$ is boundedly generated, then $M$ is a Cayley--Abels--Rosendal graph for $G$ and the orbit map is a quasi-isometry. In particular, if $S$ contains a non-displaceable subsurface and $G \geq \operatorname{PMap}_c(…

Gamma-ray Orbital Modulation in Spider Pulsars: Three Discoveries and a Universal Modulated Fraction
Maksat Satybaldiev, Manuel Linares, Vittoria Vecchiotti
https://arxiv.org/abs/2510.11699

Gamma-ray Orbital Modulation in Spider Pulsars: Three Discoveries and a Universal Modulated Fraction
Compact binary millisecond pulsars (also known as spiders) allow us to probe pulsar winds in their innermost regions, between the light cylinder (radius $\sim10^{7}$ cm) and the companion star (at $\sim10^{11}$ cm). Their flux is known to vary along the orbit, from radio to X-rays. During the past decade, gamma-ray orbital modulation (GOM) has been discovered in a handful of spiders, but its origin remains largely unknown. We present the results of a systematic search for GOM among 43 systems, …

tilepy: Smart Scheduling for Multi-Messenger Astronomy from Earth to Orbit
Halim Ashkar, Monica Seglar-Arroyo, Fabian Sch\"ussler, Weizmann Kiendr\'eb\'eogo, Mathieu de Bony de Lavergne
https://arxiv.org/abs/2508.07824

tilepy: Smart Scheduling for Multi-Messenger Astronomy from Earth to Orbit
The rise of direct detection of gravitational waves (GWs) started a new era in multi-messenger astrophysics. Like GWs, many other astrophysical transient sources suffer from poor localization, which can span tens to thousands of square degrees in the sky. Moreover, as the detection horizon for these transients widens and the detection rate increases, current electromagnetic follow-up facilities require tools to optimize the follow-up of poorly localized events and save valuable telescope time f…

Image of a quantum-corrected black hole without Cauchy horizons illuminated by a static thin accretion disk
Shilong Huang, Jiawei Chen, Jinsong Yang
https://arxiv.org/abs/2510.09956

Image of a quantum-corrected black hole without Cauchy horizons illuminated by a static thin accretion disk
Latest advances in effective quantum gravity propose a quantum-corrected black hole solution that avoids Cauchy horizons. In this paper, we study the image of the black hole and explore the influence of the quantum parameter $ζ$ on its image. First, we investigate the influence of $ζ$ on the event horizon, photon sphere, critical impact parameter, and innermost stable circular orbit associated with the black hole. We find that all these quantities exhibit an increase with increasing $ζ$. Mea…

Growth control of highly textured Bi2Te3 thin films by pulsed laser deposition
Damian Brzozowski, Yu Liu, Karola Neeleman, Magnus Nord, Ingrid G. Hallsteinsen
https://arxiv.org/abs/2510.10479

Growth control of highly textured Bi2Te3 thin films by pulsed laser deposition
Two-dimensional materials have attracted growing interest due to their unique electronic properties and potential applications in spintronics. Interfacing strongly spin-orbit-coupled chalcogenides with functional oxides such as perovskites has a particularly high potential. In this work, highly textured Bi2Te3 thin films were deposited on (111) oriented SrTiO3 by pulsed laser deposition. We show that, by careful selection of the temperature and pressure of growth, the film's stoichiometry can b…

Field-Tailoring Quantum Materials: Magneto-Synthesis of Metastable Metallic States in a Spin-Orbit-Coupled Trimer Iridate
Tristan R. Cao, Hengdi Zhao, Xudong Huai, Arabella Quane, Varun Narayanan, Thao T. Tran, Feng Ye, Gang Cao
https://arxiv.org/abs/2508.07545

Field-Tailoring Quantum Materials: Magneto-Synthesis of Metastable Metallic States in a Spin-Orbit-Coupled Trimer Iridate
We demonstrate that modest magnetic fields (a fraction of a Tesls), when applied during high-temperature crystal growth, can profoundly alter the structural and electronic ground state of a spin-orbit-coupled, antiferromagnetic trimer lattice. Using an iridate as a model system, we show that magneto-synthesis, a field-assisted synthesis approach, stabilizes a structurally compressed, metastable metallic phase that cannot be accessed through conventional synthesis routes. This field-tailored pha…

Large Language Model-Empowered Channel Prediction and Predictive Beamforming for LEO Satellite Communications
Zhixiong Chen, Hyundong Shin, Arumugam Nallanathan, Jonathon Chambers
https://arxiv.org/abs/2510.10561

Large Language Model-Empowered Channel Prediction and Predictive Beamforming for LEO Satellite Communications
Accurate channel prediction and effective beamforming are essential for low Earth orbit (LEO) satellite communications to enhance system capacity and enable high-speed connectivity. Most existing channel prediction and predictive beamforming methods are limited by model generalization capabilities and struggle to adapt to time-varying wireless propagation environments. Inspired by the remarkable generalization and reasoning capabilities of large language models (LLMs), this work proposes an LLM…

Spin-orbit-enabled realization of arbitrary two-qubit gates on moving spins
D. Fern\'andez-Fern\'andez, Y. Matsumoto, L. M. K. Vandersypen, G. Platero, S. Bosco
https://arxiv.org/abs/2508.08394

Spin-orbit-enabled realization of arbitrary two-qubit gates on moving spins
Shuttling spin qubits in systems with large spin-orbit interaction (SOI) can cause errors during motion. However, in this work, we demonstrate that SOI can be harnessed to implement an arbitrary high-fidelity two-qubit (2Q) gate. We consider two spin qubits defined in a semiconductor double quantum dot that are smoothly moved toward each other by gate voltages. We show that an arbitrary high-fidelity 2Q gate can be realized by controlling the shuttling speed and waiting times, and leveraging st…

Adaptive Navigation Strategy for Low-Thrust Proximity Operations in Circular Relative Orbit
Dario Ruggiero, Mauro Mancini, Elisa Capello
https://arxiv.org/abs/2509.02204 https:/…

Adaptive Navigation Strategy for Low-Thrust Proximity Operations in Circular Relative Orbit
This paper presents an adaptive observer-based navigation strategy for spacecraft in Circular Relative Orbit (CRO) scenarios, addressing challenges in proximity operations like formation flight and uncooperative target inspection. The proposed method adjusts observer gains based on the estimated state to achieve fast convergence and low noise sensitivity in state estimation. A Lyapunov-based analysis ensures stability and accuracy, while simulations using vision-based sensor data validate the a…

Current mood

A complex structure of escaping helium spanning more than half the orbit of the ultra-hot Jupiter WASP-121\,b
Romain Allart, Louis-Philippe Coulombe, Yann Carteret, Jared Splinter, Lisa Dang, Vincent Bourrier, David Lafreni\`ere, Lo\"ic Albert, \'Etienne Artigau, Bj\"orn Benneke, Nicolas B. Cowan, Ren\'e Doyon, Vigneshwaran Krishnamurthy, Ray Jayawardhana, Doug Johnstone, Adam B. Langeveld, Michael R. Meyer, Stefan Pelletier, Caroline Piaulet-Ghorayeb, Michael Radica,…

A complex structure of escaping helium spanning more than half the orbit of the ultra-hot Jupiter WASP-121\,b
Atmospheric escape of planets on short orbital periods, driven by the host star's irradiation, influences their evolution, composition, and atmospheric dynamics. Our main avenue to probe atmospheric escape is through the near-infrared metastable helium triplet, which has enabled mass loss rate measurements for tens of exoplanets. Among them, only a few studies show evidence for out-of-transit absorption, supporting the presence of a hydrodynamic outflow. However, none of these observations prec…

An Einstein ring fingerprint around SMBHs illuminated by BLR spectral lines
Konstantinos Kostaros, George Pappas, Padelis Papadopoulos, Wing-Fai Thi
https://arxiv.org/abs/2509.08690

An Einstein ring fingerprint around SMBHs illuminated by BLR spectral lines
The continuum emission from the hot and ionized inner regions of a supermassive black hole (SMBH) accretion disk that is strongly lensed by the light-ring (i.e., the unstable photon orbit), is always superimposed on that of the locally emitting plasma near the innermost stable circular orbit (ISCO), masking strong-gravity effects and making their study difficult. A cleaner image of the light-ring against a non-luminous background, not affected by the emission and all the dynamical effects takin…

Spin-Orbit Misalignments of Eccentric Black Hole Mergers in AGN Disks
Gaia Fabj, Christopher Tiede, Connar Rowan, Martin Pessah, Johan Samsing
https://arxiv.org/abs/2510.07952 h…

Spin-Orbit Misalignments of Eccentric Black Hole Mergers in AGN Disks
The disks of active galactic nuclei (AGNs) provide a natural environment where stellar-mass black holes (BHs) can dynamically pair, undergo repeated interactions, and eventually merge. It is commonly assumed that gas accretion will both efficiently spin up disk-embedded black holes and align the orbits of embedded binaries with the disk plane, leading to mergers with preferentially positive effective spin parameters ($χ_{\mathrm{eff}}$). Such predictions have motivated the use of $χ_{\mathrm{…

RFSoC receiver calibration system for 21-cm global spectrum experiments from space: The CosmoCube case
Jiacong Zhu, Eloy de Lera Acedo, Kaan Artuc, Xuelei Chen
https://arxiv.org/abs/2510.06558

RFSoC receiver calibration system for 21-cm global spectrum experiments from space: The CosmoCube case
The CosmoCube project plans to deploy a global 21-cm spectrometer with 10-100 MHz observation band in a lunar orbit. The farside part of such an orbit, i.e. the part of orbit behind the Moon, offers an ideal site for accurately measuring the 21-cm signal from the Dark Ages, Cosmic Dawn and Epoch of Reionization, as the effects of the Earth's ionosphere, artificial radio frequency interference (RFI), and complex terrain and soil are all avoided. Given the limitations of a satellite platform, we …

The rings of (2060) Chiron: Evidence of an evolving system
C. L. Pereira, F. Braga-Ribas, B. Sicardy, R. Leiva, M. Assafin, B. E. Morgado, J. L. Ortiz, P. Santos-Sanz, J. I. B. Camargo, G. Margoti, Y. Kilic, G. Benedetti-Rossi, R. Vieira-Martins, T. F. L. L. Pinheiro, R. Sfair, F. L. Rommel, A. R. Gomes-J\'unior, R. C. Boufleur, R. Duffard, J. Desmars, D. Souami, N. Morales, F. Arrese, K. Barkaoui, A. Burdanov, C. A. Colazo, C. A. Domingues, H. Dutra, R. C. Gargalhone, C. Jacques, …

The rings of (2060) Chiron: Evidence of an evolving system
The centaur (2060) Chiron has long been a candidate for hosting material in orbit, based on occultation and photometric and spectroscopic data. Here, we present a multichord stellar occultation observed on 2023 September 10 UT that reveals new and complex structures surrounding Chiron. High-cadence light curves show multiple secondary events that are best explained (when compared with a multishell interpretation) with a system of three confined rings located at average radii of 273, 325, and 43…

Fourier-Orbit Construction of GKZ-Type Systems for Commutative Linear Algebraic Groups
Go Okuyama
https://arxiv.org/abs/2509.03881 https://arxiv.org/pdf/25…

Fourier-Orbit Construction of GKZ-Type Systems for Commutative Linear Algebraic Groups
We introduce the Fourier-orbit construction of GKZ-type D-modules associated with commutative linear algebraic group actions G = TU (where T is an algebraic torus and U a unipotent group) on a vector space V. This framework generalizes the classical toric GKZ system to mixed torus-unipotent settings. We establish generic holonomicity via a parameter-free symbolic moment ideal, develop symbolic tools for rank analysis, and exhibit new families with Airy-type irregular behavior. Our approach reco…

Trembling motion of electrons driven by Larmor spin precession
I. Stepanov, M. Ersfeld, A. V. Poshakinskiy, M. Lepsa, E. L. Ivchenko, S. A. Tarasenko, B. Beschoten
https://arxiv.org/abs/2510.12187

Trembling motion of electrons driven by Larmor spin precession
We show that the initialization of an ensemble of electrons in the same spin state in strained n-InGaAs subject to a perpendicular magnetic field triggers an AC electric current at GHz frequencies. The AC current emerges in the absence of any driving force and survives until the coherent precession of the electron spins is lost. The current amplitude increases linearly with both the spin-orbit coupling strength and the external magnetic field. The generation mechanism of the observed oscillator…

Satellite Direct-to-Device from Low Earth Orbit: Techno-Economic Analysis of a Global Non-Terrestrial Network
Adnan Aijaz, Peizheng Li, Sajida Gufran
https://arxiv.org/abs/2510.04651

Satellite Direct-to-Device from Low Earth Orbit: Techno-Economic Analysis of a Global Non-Terrestrial Network
Low Earth orbit (LEO) satellites and satellite direct-to-device (D2D) technology are at the heart of the next-generation global connectivity which promises direct access to space-based broadband services for unmodified 3GPP-compliant handsets. With a rapidly evolving ecosystem, it is important to evaluate the feasibility, cost-effectiveness, and profitability of these services. By assessing the technological aspects as well as economic implications, stakeholders can make informed decisions abou…

Persistent spin texture preserved by local symmetry in graphene/WTe$_2$ heterostructure
Przemyslaw Przybysz, Karma Tenzin, Berkay Kilic, Witold Kozlowski, Pawel J. Kowalczyk, Pawel Dabrowski, Jagoda Slawinska
https://arxiv.org/abs/2509.08668

Persistent spin texture preserved by local symmetry in graphene/WTe$_2$ heterostructure
Crystal symmetries in solids give rise to spin-momentum locking, which determines how an electron's spin orientation depends on its momentum. This relationship, often referred to as spin texture, influences both charge-to-spin conversion and spin relaxation, making it one of the essential characteristics for spin-orbit-driven phenomena. Materials with strong spin-orbit coupling and broken inversion symmetry can host persistent spin textures (PSTs) - unidirectional spin configurations in momentu…

A four-planet system orbiting the old thick disk star TOI-1203
D. Gandolfi, A. Alnajjarine, L. M. Serrano, J. A. Egger, K. W. F. Lam, J. Cabrera, A. P. Hatzes, M. Fridlund, M. Garbaccio Gili, T. G. Wilson, W. D. Cochran, A. Brandeker, E. Goffo, S. G. Sousa, G. Nowak, A. Heitzmann, C. Hellier, J. Venturini, J. Livingston, A. Bonfanti, O. Barrag\'an, V. Adibekyan, E. Knudstrup, Y. Alibert, S. Grziwa, C. Ziegler, L. Fossati, F. Murgas, A. C. M. Correia, S. H. Albrecht, J. Laskar, E. W…

A four-planet system orbiting the old thick disk star TOI-1203
TOI-1203 is a bright (V=8.6) G3 V star known to host a transiting warm sub-Neptune on a 25.5 d orbit. Here we report on an intensive high-precision radial velocity and photometric follow-up campaign carried out with the HARPS spectrograph and the CHEOPS space telescope. We found that TOI-1203 has an enhancement of $α$ elements relative to iron of [$α$/Fe]=$0.21\pm0.04$. With an age of $\sim$12.5 Gyr, TOI-1203 belongs to the old, $α$-element enhanced stellar population of the galactic thick d…

RKKY interaction mediated by a spin-polarized 2D electron gas with Rashba and altermagnetic coupling
Anirban Kundu
https://arxiv.org/abs/2509.10778 https://

RKKY interaction mediated by a spin-polarized 2D electron gas with Rashba and altermagnetic coupling
Magnetic interactions between impurity spins play a crucial role in determining magnetic configurations in spintronic systems. Using a Green's function formalism, we investigate Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interactions between two localized spins mediated by a two-dimensional electron gas arising from two spin-polarized bands with Rashba spin-orbit coupling (RSOC) and altermagnetic dispersion. We analyze two distinct regimes: (a) strong out-of-plane ferromagnetic order, and (b…

Ferromagnetic Resonance Spectroscopy on the Kagome Magnet MgMn$_6$Sn$_6$
Riju Pal, Kakan Deb, Nitesh Kumar, Bernd B\"uchner, Alexey Alfonsov, Vladislav Kataev
https://arxiv.org/abs/2510.10356

Ferromagnetic Resonance Spectroscopy on the Kagome Magnet MgMn$_6$Sn$_6$
MgMn$_6$Sn$_6$ is the itinerant ferromagnet on the kagome lattice with high ordering temperature featuring complex electronic properties due to the nontrivial topological electronic band structure, where the spin-orbit coupling (SOC) plays a crucial role. Here, we report a detailed ferromagnetic resonance (FMR) spectroscopic study of MgMn$_6$Sn$_6$ aimed to elucidate and quantify the intrinsic magnetocrystalline anisotropy that is responsible for the alignment of the Mn magnetic moments in the …

Reconstructing flows from the orbit space
Thomas Barthelm\'e, Sergio Fenley, Kathryn Mann
https://arxiv.org/abs/2509.01594 https://arxiv.org/pdf/2509.0…

Reconstructing flows from the orbit space
We give some simple conditions under which a group acting on a bifoliated plane comes from the induced action of a pseudo-Anosov flow on its orbit space. An application of the strategy is a less technical proof of a result of Barbot that the induced action of an Anosov flow on its orbit space uniquely determines the flow up to orbit equivalence. In another application, we recover an expansive flow on a 3-manifold from the action of a group on a \emph{loom space} as defined by Schleimer and Sege…

Dual-mode operation of ring-shaped spin Hall magnetoresistance sensor with biaxial sensing capability
Jiayi Xu, Yuxin Si, Jiaqi Wang, Tingxuan Zhang, Zhenfei Hou, Yihong Wu
https://arxiv.org/abs/2509.11671

Dual-mode operation of ring-shaped spin Hall magnetoresistance sensor with biaxial sensing capability
We present a spin Hall magnetoresistance sensor based on a NiFe/Pt multiring bridge structure, which exhibits high sensitivity and good linearity in two perpendicular directions within the sensor plane. Under DC excitation, it responds linearly to magnetic field perpendicular to the current direction, whereas AC excitation enables a linear response with near-zero offset to magnetic field aligned with the current direction, driven by spin-orbit torque effect. Moreover, the AC excitation effectiv…

Additive actions on projective surfaces with a finite number of orbits
Alexander Perepechko
https://arxiv.org/abs/2508.07924 https://arxiv.org/pdf/2508.079…

Additive actions on projective surfaces with a finite number of orbits
An additive action on an algebraic variety is an effective action of the vector group with an open orbit. We describe projective surfaces with du Val singularities that admit an additive action with a finite number of orbits. In particular, we provide examples of projective surfaces with 1-parameter families of pairwise non-isomorphic additive actions, which answers the question by Hassett and Tschinkel.

A preliminary orbit for the satellite of dwarf planet (136472) Makemake
Daniel Bamberger
https://arxiv.org/abs/2509.05880 https://arxiv.org/pdf/2509.05880

A preliminary orbit for the satellite of dwarf planet (136472) Makemake
I present a preliminary orbit for the satellite of dwarf planet (136472) Makemake, based on archival Hubble Space Telescope images taken on 13 days between April 2015 and February 2019. The satellite was detected on twelve of them. A best-fit circular orbit has a period of $18.023 \pm 0.017$ d, a semi-major axis of $22250 \pm 780$ km, and an inclination of $83.7^{\circ} \pm 1.0^{\circ}$ relative to the line of sight. That orbit is nearly edge-on, raising the possibility of ongoing or imminent m…

On The Orbital Evolution of Multiple Wide Super-Jupiters: How Disk Migration and Dispersal Shape the Stability of The PDS 70 System
Clarissa R. Do \'O, Jaehan Bae, Quinn M. Konopacky, Jayke S. Nguyen, Patrick Diamond, Krzysztof Go\'zdziewski, Dawid Jankowski
https://arxiv.org/abs/2510.11021…

On The Orbital Evolution of Multiple Wide Super-Jupiters: How Disk Migration and Dispersal Shape the Stability of The PDS 70 System
Direct imaging has revealed exoplanet systems hosting multiple wide-orbit Super-Jupiters, where planet-planet interactions can shape their long-term dynamical evolution. These strong perturbations may lead to orbital instability, raising questions about the long-term survival of such systems. Shortly after formation, planet-disk interactions can shepherd planets into mean-motion resonances, which may promote long-term stability as seen in HR 8799. However, early-stage processes such as disk pho…

Quantifying Charge Noise Sources in Quantum Dot Spin Qubits via Impedance Spectroscopy, DLTS, and C-V Analysis
Tyafur Rahman Pathan, Daryoosh Vashaee
https://arxiv.org/abs/2510.10861

Quantifying Charge Noise Sources in Quantum Dot Spin Qubits via Impedance Spectroscopy, DLTS, and C-V Analysis
The coherence and fidelity of quantum dot (QD) spin qubits are fundamentally limited by charge noise arising from electrically active trap states at oxide interfaces, heterostructure boundaries, and within the bulk semiconductor. These traps introduce electrostatic fluctuations that couple to the qubit via spin-orbit interactions or charge-sensitive confinement potentials, leading to dephasing and gate errors. In this work, we present a general trap characterization framework for identifying an…

Reanalysis of the eclipses of LHS 1140 c: No evidence of an atmosphere and implications for the internal structure of the planet
Alexandra Rochon, \'Etienne Artigau, Drew Weisserman, Lisa Dang, Ren\'e Doyon, Charles Cadieux, Ryan Cloutier
https://arxiv.org/abs/2510.11397

Reanalysis of the eclipses of LHS 1140 c: No evidence of an atmosphere and implications for the internal structure of the planet
We present the reanalysis of three 15 micron JWST/MIRI secondary eclipses of LHS 1140 c, a warm super-Earth (R$_{\rm{p}}$ = 1.272 R$_{\oplus}$) in a 3.78-day orbit around an M4.5 dwarf. We present a novel method for data reduction that leverages spatial derivatives of the point-spread function and compare it to widely used aperture photometry. Both methods yield eclipse depth consistent within 1 sigma of the values reported in the literature. We measure an eclipse depth of 271$^{+31}_{-30}$ ppm…

Analyzing Data Quality and Decay in Mega-Constellations: A Physics-Informed Machine Learning Approach
Katarina Dyreby, Francisco Caldas, Cl\'audia Soares
https://arxiv.org/abs/2510.11242

Analyzing Data Quality and Decay in Mega-Constellations: A Physics-Informed Machine Learning Approach
In the era of mega-constellations, the need for accurate and publicly available information has become fundamental for satellite operators to guarantee the safety of spacecrafts and the Low Earth Orbit (LEO) space environment. This study critically evaluates the accuracy and reliability of publicly available ephemeris data for a LEO mega-constellation - Starlink. The goal of this work is twofold: (i) compare and analyze the quality of the data against high-precision numerical propagation. (ii) …

Rings around irregular bodies I. Structure of the resonance mesh, applications to Chariklo, Haumea and Quaoar
Bruno Sicardy, Heikki Salo, Maryame El Moutamid, Stefan Renner, Damya Souami
https://arxiv.org/abs/2510.11249

Rings around irregular bodies I. Structure of the resonance mesh, applications to Chariklo, Haumea and Quaoar
Three ring systems have been discovered to date around small irregular objects of the solar system (Chariklo, Haumea and Quaoar). For the three bodies, material is observed near the second-order 1/3 Spin-Orbit Resonance (SOR) with the central object, and in the case of Quaoar, a ring is also observed near the second-order resonance 5/7 SOR. This suggests that second-order SORs may play a central role in ring confinement. This paper aims at better understanding this role from a theoretical point…

Families of Transfers from circular low Earth orbit to Distant Prograde Orbit around the Moon
Shuyue Fu, Di Wu, Yihan Peng, Peng Shi, Shengping Gong
https://arxiv.org/abs/2508.01769

Families of Transfers from circular low Earth orbit to Distant Prograde Orbit around the Moon
Distant prograde orbits around the Moon exhibit remarkable potential for practical applications such as cislunar surveillance activities and low-energy transfers due to their instability. Previous works on transfers from circular low Earth orbit to distant prograde orbits mainly focused on construction methods based on dynamical structures, lacking a comprehensive analysis of the solution space of this transfer scenario. This paper investigates the solution space and identifies families of tran…

Toward Alternative Earths' Habitability of Solar System Bodies at Earth's Orbit
Mohammed Abdel Razak
https://arxiv.org/abs/2509.06259 https://arxiv…

Toward Alternative Earths' Habitability of Solar System Bodies at Earth's Orbit
This paper presents the first structured evaluation of Solar System bodies hypothetically relocated to Earth orbit (1 AU) to assess their potential as alternative habitats. Using comparative criteria, planetary size and gravity, atmospheric retention, volatile accessibility, weather system potential, soil development feasibility, and orbital transfer cost. We find that most bodies are unsuitable. Mercury and the Moon lack volatiles and atmospheres, while gas and ice giants offer no solid surfac…

Stellar occultations in support of the LUMIO orbit determination
Davide Banzi, Riccardo Lasagni Manghi, Marco Zannoni
https://arxiv.org/abs/2509.04177 https://

Stellar occultations in support of the LUMIO orbit determination
This work investigates the use of stellar occultation measurements to enhance the orbit determination performance of the Lunar Meteoroid Impact Observer (LUMIO) mission, operating from a quasi-Halo orbit around the Earth-Moon L2 point. During science phases, when radiometric tracking is sparse and low illumination limits conventional optical navigation methods, occultation events, defined as precise timings of stellar appearances/disappearances behind the Moon's limb, offer a suitable alternati…

Replaced article(s) found for astro-ph.EP. https://arxiv.org/list/astro-ph.EP/new
[1/1]:
- Revised Mass and Orbit of $\varepsilon$ Eridani b: A 1 Jupiter-Mass Planet on a Near-Circular Orbit
William Thompson, Eric Nielsen, Jean-Baptiste Ruffio, Sarah Blunt, Christian Marois