Tootfinder

It’s opportunistic but I’m drunk so sod it: if you want to buy me a book for my birthday, here’s what I want to read: https://www.amazon.co.uk/hz/wishlist/ls/2A169UYO51WU0?ref_=wl_share

Exoplanets beyond the Conservative Habitable Zone: I. Habitability
Amri Wandel
https://arxiv.org/abs/2510.00736 https://arxiv.org/pdf/2510.00736

Exoplanets beyond the Conservative Habitable Zone: I. Habitability
The Habitable Zone (HZ) is defined by the possibility of sustaining liquid water on a planetary surface. In the Solar System, the HZ for a conservative climate model extends approximately between the orbits of Earth and Mars. We elaborate on earlier HZ models and apply an analytical climate model of the temperature distribution on tidally-locked planets to extend the HZ. We show that planets orbiting M- and K-dwarf stars may maintain liquid water on their night side, significantly closer to the…

CHRONOS: Cryogenic sub-Hz cROss torsion bar detector with quantum NOn-demolition Speed meter
Yuki Inoue, Hsiang-Chieh Hsu, Hsiang-Yu Huang, M. Afif Ismail, Vivek Kumar, Miftahul Ma'arif, Avani Patel, Daiki Tanabe, Henry Tsz-King Wong, Da-Chun Yu
https://arxiv.org/abs/2509.23172

CHRONOS: Cryogenic sub-Hz cROss torsion bar detector with quantum NOn-demolition Speed meter
We propose a next-generation ground-based gravitational-wave detector, the Cryogenic sub-Hz cROss torsion-bar detector with quantum NOn-demolition Speed meter (CHRONOS), optimized for the unexplored 0.1-10Hz band bridging the gap between the space-based LISA and future ground-based detectors such as Cosmic Explorer and the Einstein Telescope. CHRONOS combines a ring-cavity Sagnac interferometer with torsion-bar test masses to realize the first quantum nondemolition (QND) measurement of angular …

EEG Brain mapping based on the Duffing oscillator
Mahmut Akilli, Nazmi Yilmaz
https://arxiv.org/abs/2509.00618 https://arxiv.org/pdf/2509.00618

EEG Brain mapping based on the Duffing oscillator
In this study, we introduce the EEG brain mapping technique based on the Duffing oscillator. For this purpose, we used EEG signals recorded from two musicians and two audience members in a music experiment. The Duffing oscillator was used to detect weak signals in the EEG signals. The frequency values of the weak signal were searched between 12 Hz and 37 Hz in all EEG channels of the participants. Then, topographical maps of the brain were generated according to the numbers of these weak signal…

High-frequency continuous gravitational waves searched in LIGO O3 public data with Einstein@Home
Brian McGloughlin, Benjamin Steltner, Jasper Martins, Maria Alessandra Papa, Heinz-Bernd Eggenstein, Jing Ming, Bernd Machenschalk, Reinhard Prix, Maximilian Bensch
https://arxiv.org/abs/2508.20073

High-frequency continuous gravitational waves searched in LIGO O3 public data with Einstein@Home
We search for nearly-monochromatic gravitational wave signals with frequencies $800.0~\textrm{Hz} \leq f \leq 1686.0~\textrm{Hz}$ and spin-down $-2.7\times10^{-9}~\textrm{Hz}\,\textrm{s}^{-1} \leq \dot f \leq 0.2\times 10^{-9}~\textrm{Hz}\,\textrm{s}^{-1}$. We use LIGO O3 public data from the Hanford and Livingston detectors and deploy this search on the Einstein@Home volunteer-computing project. This is the most sensitive search carried out to date in this parameter space. Our results are cons…

A comprehensive study of second and third harmonic conversion efficiency, angular and temperature tolerance, and long-term stability in LBO crystals using a 10-J-class laser
Huzefa Aliasger, Ond\v{r}ej Nov\'ak, Zbyn\v{e}k Hubka, Martin Hanu\v{s}, Petr Navr\'atil, Patricie Severov\'a, Ond\v{r}ej Denk, Jan Pila\v{r}, Tom\'a\v{s} Paliesek, Martin Divok\'y, Ond\v{r}ej Schreiber, Michal Jel\'inek, Martin Smr\v{z}, Tom\'a\v{s} Mocek

A comprehensive study of second and third harmonic conversion efficiency, angular and temperature tolerance, and long-term stability in LBO crystals using a 10-J-class laser
We present a study of second harmonic generation (SHG) and third harmonic generation (THG) in lithium triborate (LBO) crystals using a high-energy, 10-J-class, 10 Hz Yb:YAG laser system. We achieved high conversion efficiencies of 75\% for SHG and 56\% for THG for Gaussian-like temporal pulse shapes and top-hat-like beam profiles. The angular and temperature dependence of the LBO crystals were measured and validated through numerical simulations. The SHG process exhibited an angular acceptance …

Exoplanets beyond the Conservative Habitable Zone: II. Occurrence
Amri Wandel
https://arxiv.org/abs/2510.00782 https://arxiv.org/pdf/2510.00782

Exoplanets beyond the Conservative Habitable Zone: II. Occurrence
We demonstrate that the extension of the Habitable Zone (HZ) due to the presence of liquid water on the night side of tidally locked planets, modelled in this and earlier works, significantly increases the number of potentially habitable planets. We calculate the occurrence of habitable planets orbiting M-, K-, and G-dwarf stars within the conservative and extended HZ, beyond the inner and outer boundaries of the conservative HZ. Integrating over the phase space in the HZ diagram and normalizin…

A 50 s quasi-periodic oscillation in the early X-ray afterglow of GRB 220711B
H. Gao, W. -H. Lei, S. Xiao, Z. -P. Zhu, L. Lan, S. -K. Ai, A. Li, N. Xu, T. -C. Wang, B. Zhang, D. Xu, J. P. U. Fynbo, K. E. Heintz, P. Jakobsson, D. A. Kann, S. -Y. Fu, S. -Q. Jiang, X. Liu, S. -L. Xiong, W. -X. Peng, X. -B. Li, W. -C. Xue
https://arxiv.org/abs…

A 50 s quasi-periodic oscillation in the early X-ray afterglow of GRB 220711B
It is generally believed that long duration gamma-ray bursts (GRBs) originate from the core collapse of rapidly spinning massive stars and at least some of them are powered by hyper-accreting black holes. However, definite proofs about the progenitor and central engine of these GRBs have not been directly observed in the past. Here we report the existence of a Quasi-Periodic Oscillation (QPO) signature with periodic frequency $\sim$0.02 Hz in the early X-ray afterglow phase of GRB 220711B. Such…

Neu auf der Wunschliste: https://www.amazon.de/hz/wishlist/ls/3HYT6TVV6PW2H
Falls jemand was Gebrauchtes hat, bitte nicht wegwerfen, gerne her damit.

This isn’t about Liquid Glass, which probably works better in Safari than in most other apps; I mean basic stuff like some sites just render blank or there’s 60-hz GPU flickering and many outright freezes and crashes

40 Hz audiovisual stimulation improves sustained attention and related brain oscillations #neuroscience

Dark characterization of Ti/Al LEKIDs for the search of axions in the W-band
Victor Rollano, Alejandro Pascual Laguna, David Rodriguez, Martino Calvo, Maria Teresa Magaz, Daniel Granados, Alessandro Monfardini, Alicia Gomez
https://arxiv.org/abs/2510.01913

Dark characterization of Ti/Al LEKIDs for the search of axions in the W-band
We report the electrical (dark) characterization of lumped-element kinetic inductance detectors (LEKIDs) fabricated from a Titanium/Aluminum bilayer and designed for broadband absorption in the W-band (75-110 GHz). These detectors are prototypes for future QCD axion search experiments within the Canfranc Axion Detection Experiment (CADEx), which demand sub 1e-19 W/Hz^0.5 sensitivities under low optical backgrounds. We combine a Mattis-Bardeen analysis to the temperature dependence of the detect…

TIL: die Etrusker Spitzmaus hat eine Herzfrequenz von über 17 Hz. Ja richtig gelesen... zwischen 1000 und 1300 Herzschläge pro Minute. Das die nicht explodiert dabei 🤯
From: @…
https://

Experimental Demonstration of Robust Distributed Wireless Clock Synchronization
Kumar Sai Bondada, Hiten Kothari, Yibin Liang, Daniel J. Jakubisin, R. Michael Buehrer
https://arxiv.org/abs/2509.25277

Experimental Demonstration of Robust Distributed Wireless Clock Synchronization
Distributed wireless clock synchronization is essential for aligning the clocks of distributed transceivers in support of joint transmission and reception techniques. One recently explored method involves synchronizing distributed transceivers using a two-tone waveform, where the tones are separated in frequency by a clock (frequency) reference signal. Prior research has demonstrated frequency accuracy better than 1 Hz; however, this approach remains vulnerable to both intentional and unintenti…

75-Hz is actually usable.
#epaper #modos

Einstein@Home all-sky "bucket" search for continuous gravitational waves in LIGO O3 public data
Brian McGloughlin, Jasper Martins, Benjamin Steltner, Maria Alessandra Papa, Heinz-Bernd Eggenstein, Bernd Machenschalk, Reinhard Prix, Maximillian Bensch
https://arxiv.org/abs/2508.16423

Einstein@Home all-sky "bucket" search for continuous gravitational waves in LIGO O3 public data
We conduct an all-sky search for continuous gravitational waves using LIGO O3 public data from the Hanford and Livingston detectors. We search for nearly-monochromatic signals with frequencies $30\, \text{Hz} \leq f \leq 250\, \text{Hz}$ and spin-down $-2.7 \times 10^{-9}\, \text{Hz/s} \leq \dot{f} \leq 0.2 \times 10^{-9}\, \text{Hz/s}$. We deploy this search on the Einstein@Home volunteer-computing project and on three super computer clusters; the Atlas supercomputer at the Max Planck Institut…

A universal animal communication tempo resonates with the receiver's brain
Guy Amichay, Vijay Balasubramanian, Daniel M. Abrams
https://arxiv.org/abs/2508.21530 https://

A universal animal communication tempo resonates with the receiver's brain
During fieldwork in Thailand we observed nearly identical frequencies of co-located flashing fireflies and chirping crickets. Motivated by this, we perform a meta-analysis and show an abundance of evolutionarily distinct species that communicate isochronously at ~0.5-4 Hz, suggesting that this might be a frequency "hotspot." We hypothesize that this timescale may have a universal basis in the biophysics of the receiver's neurons. We test this by demonstrating that small receiver circuits constr…

Optical Interferometric Readout of a Magnetically Levitated Superconducting Microsphere
J. J. Hansen, S. Minniberger, D. Ilk, P. Asenbaum, G. Higgins, R. G. Povey, P. Schmidt, J. Hofer, R. Claessen, M. Aspelmeyer, M. Trupke
https://arxiv.org/abs/2508.11731

Optical Interferometric Readout of a Magnetically Levitated Superconducting Microsphere
We probe the motion of a 6 $μg$ magnetically levitated superconducting microsphere using optical interferometry at 3 K, achieving a resolution better than 1 $nm/ \sqrt{Hz}$, and use the measured signal to feedback-cool its motion. The resolution exceeds the shot-noise limit of 11 $pm/ \sqrt{Hz}$ primarily due to technical noise arising from the roughness of the particle. Combined with established techniques of cavity optomechanics, the high degree of isolation from environmental noise afforded…

Detecting milli-Hz gravitational waves with optical resonators
G. Barontini, X. Calmet, V. Guarrera, A. Smith, A. Vecchio
https://arxiv.org/abs/2509.15841 https://

Detecting milli-Hz gravitational waves with optical resonators
We propose a gravitational wave detector based on ultrastable optical cavities enabling the detection of gravitational wave signals in the mostly unexplored $10^{-5}-1$ Hz frequency band. We illustrate the working principle of the detector and discuss that several classes of gravitational wave sources, both of astrophysical and cosmological origin, may be within the detection range of this instrument. Our work suggests that terrestrial gravitational wave detection in the milli-Hz frequency rang…

A $6.37\,{\rm Hz}$ quasi-periodic oscillating photospheric emission in GRB~240825A
Guo-Yu Li, Da-Bin Lin, Zhi-Lin Chen, Bao-Quan Huang, Tong Liu, En-Wei Liang
https://arxiv.org/abs/2507.16538

A $6.37\,{\rm Hz}$ quasi-periodic oscillating photospheric emission in GRB~240825A
Using data from Swift-BAT and Fermi-GBM, we report the first detection of a high-confidence quasi-periodic oscillation (QPO) in the thermal emission of gamma-ray burst GRB~240825A. The spectral analysis of the burst reveals two radiation components, including a thermal emission dominant in $100 \text{--} 300\,\mathrm{keV}$ and a non-thermal emission spanning a wide energy range. During the interval $2.07 \text{--} 3.25\,\mathrm{s}$ post-trigger, a strong QPO signal at $6.37\,\mathrm{Hz}$ ($\gtr…

NeuralPVS: Learned Estimation of Potentially Visible Sets
Xiangyu Wang, Thomas K\"ohler, Jun Lin Qiu, Shohei Mori, Markus Steinberger, Dieter Schmalstieg
https://arxiv.org/abs/2509.24677

NeuralPVS: Learned Estimation of Potentially Visible Sets
Real-time visibility determination in expansive or dynamically changing environments has long posed a significant challenge in computer graphics. Existing techniques are computationally expensive and often applied as a precomputation step on a static scene. We present NeuralPVS, the first deep-learning approach for visibility computation that efficiently determines from-region visibility in a large scene, running at approximately 100 Hz processing with less than $1\%$ missing geometry. This app…

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Event-Based Visual Teach-and-Repeat via Fast Fourier-Domain Cross-Correlation
Gokul B. Nair, Alejandro Fontan, Michael Milford, Tobias Fischer
https://arxiv.org/abs/2509.17287 h…

Event-Based Visual Teach-and-Repeat via Fast Fourier-Domain Cross-Correlation
Visual teach-and-repeat navigation enables robots to autonomously traverse previously demonstrated paths by comparing current sensory input with recorded trajectories. However, conventional frame-based cameras fundamentally limit system responsiveness: their fixed frame rates (typically 30-60 Hz) create inherent latency between environmental changes and control responses. Here we present the first event-camera-based visual teach-and-repeat system. To achieve this, we develop a frequency-domain …

Potential for Lunar Interior Science by the Gravitational-Wave Detector LILA
Mark P. Panning, Philippe Lognonn\'e, Teviet Creighton, James Trippe, Volker Quetschke, Josipa Majstrorovi\'c, Karan Jani
https://arxiv.org/abs/2509.15452

Potential for Lunar Interior Science by the Gravitational-Wave Detector LILA
The Laser Interferometer Lunar Antenna (LILA), a concept for measuring sub-Hz gravitational waves on the Moon, would use laser strainmeters to obtain extremely sensitive strain measurements from 1 mHz to 1 Hz. With proposed strain sensitivities, LILA would also be able to measure the normal modes of the Moon from 1-10 mHz at high signal-to-noise ratio. Such measurements would enable significant advances in our understanding of both the spherically symmetric and even 3D deep internal structure o…

On the origin of the dominant waves in the extended solar corona
Forrest Mozer, Oleksiy Agapitov, Orlando Romeo, Vadim Roytershteyn, Andrii Voshchepynets
https://arxiv.org/abs/2509.09016

On the origin of the dominant waves in the extended solar corona
The extended solar corona at 10-30 solar radii is essentially devoid of all waves below 100 kHz other than triggered ion acoustic waves (TIAW), which consist of a low frequency electromagnetic wave at a frequency of a few Hz coupled to one or more electrostatic waves at a few hundred Hz, such that the amplitudes of the higher frequency waves peak at a fixed phase of each low frequency wave period. All the waves in a TIAW event travel at the same phase speed, which is found to be 150 km s (the i…

Deep Temporal Graph Networks for Real-Time Correction of GNSS Jamming-Induced Deviations
Ivana Kesi\'c, Alja\v{z} Blatnik, Carolina Fortuna, Bla\v{z} Bertalani\v{c}
https://arxiv.org/abs/2509.14000

Deep Temporal Graph Networks for Real-Time Correction of GNSS Jamming-Induced Deviations
Global Navigation Satellite Systems (GNSS) are increasingly disrupted by intentional jamming, degrading availability precisely when positioning and timing must remain operational. We address this by reframing jamming mitigation as dynamic graph regression and introducing a receiver-centric deep temporal graph network that predicts, and thus corrects, the receivers horizontal deviation in real time. At each 1 Hz epoch, the satellite receiver environment is represented as a heterogeneous star gra…

A continuous-wave vacuum ultraviolet laser for the nuclear clock
Qi Xiao, Gleb Penyazkov, Xiangliang Li, Beichen Huang, Wenhao Bu, Juanlang Shi, Haoyu Shi, Tangyin Liao, Gaowei Yan, Haochen Tian, Yixuan Li, Jiatong Li, Bingkun Lu, Li You, Yige Lin, Yuxiang Mo, Shiqian Ding
https://arxiv.org/abs/2507.19449 https://arxiv.org/pdf/2507.19449 https://arxiv.org/html/2507.19449
arXiv:2507.19449v1 Announce Type: new
Abstract: The exceptionally low-energy isomeric transition in $^{229}$Th at around 148.4 nm offers a unique opportunity for coherent nuclear control and the realisation of a nuclear clock. Recent advances, most notably the incorporation of large ensembles of $^{229}$Th nuclei in transparent crystals and the development of pulsed vacuum-ultraviolet (VUV) lasers, have enabled initial laser spectroscopy of this transition. However, the lack of an intense, narrow-linewidth VUV laser has precluded coherent nuclear manipulation. Here we introduce and demonstrate the first continuous-wave laser at 148.4 nm, generated via four-wave mixing (FWM) in cadmium vapor. The source delivers 100 nW of power with a linewidth well below 100 Hz and supports broad wavelength tunability. This represents a five-orders-of-magnitude improvement in linewidth over all previous single-frequency lasers below 190 nm, marking a major advance in laser technology. We develop a spatially resolved homodyne technique to place a stringent upper bound on the phase noise induced by the FWM process and demonstrate sub-hertz linewidth capability. These results eliminate the final technical hurdle to a $^{229}$Th-based nuclear clock, opening new directions in quantum metrology, nuclear quantum optics and precision tests of the Standard Model. More broadly, they establish a widely tunable, ultranarrow-linewidth laser platform for applications across quantum information science, condensed matter physics, and high-resolution VUV spectroscopy.
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Precision spectral estimation at sub-Hz frequencies: closed-form posteriors and Bayesian noise projection
Lorenzo Sala, Stefano Vitale
https://arxiv.org/abs/2507.20846 https://

Precision spectral estimation at sub-Hz frequencies: closed-form posteriors and Bayesian noise projection
We present a Bayesian method for estimating spectral quantities in multivariate Gaussian time series. The approach, based on periodograms and Wishart statistics, yields closed-form expressions at any given frequency for the marginal posterior distributions of the individual power spectral densities, the pairwise coherence, and the multiple coherence, as well as for the joint posterior distribution of the full cross-spectral density matrix. In the context of noise projection - where one series i…

Searching for dark photon dark matter from terrestrial magnetic fields
Kimihiro Nomura, Atsushi Nishizawa, Atsushi Taruya, Yoshiaki Himemoto
https://arxiv.org/abs/2509.15783 htt…

Searching for dark photon dark matter from terrestrial magnetic fields
We present a novel search for dark photon dark matter (DM) using terrestrial magnetic field measurements at frequencies below 100 Hz. Coherently oscillating dark photon DM can induce a monochromatic magnetic field via kinetic mixing with ordinary photons. Notably, for dark photon masses $m_{A'}$ around $3 \times 10^{-14}$ eV, the signal can be resonantly amplified within a cavity formed by the Earth's surface and the ionosphere. We compute the expected signal incorporating the effect of atmosph…

Modeling Adaptive Tracking of Predictable Stimuli in Electric Fish
Yu Yang, Andreas Oliveira, Louis L. Whitcomb, Felipe Pait, Mario Sznaier, Noah J. Cowan
https://arxiv.org/abs/2509.15344

Modeling Adaptive Tracking of Predictable Stimuli in Electric Fish
The weakly electric fish \emph{Eigenmannia virescens} naturally swims back and forth to stay within a moving refuge, tracking its motion using visual and electrosensory feedback. Previous experiments show that when the refuge oscillates as a low-frequency sinusoid (below about 0.5 Hz), the tracking is nearly perfect, but phase lag increases and gain decreases at higher frequencies. Here, we model this nonlinear behavior as an adaptive internal model principle (IMP) system. Specifically, an adap…

Investigation of the Axe-shaped Radio Galaxy J1051 5523 with uGMRT
Sudheesh T. P. (CHRIST University Bangalore India), Ruta Kale (NCRA-TIFR Pune India), Jithesh V. (CHRIST University Bangalore India), Ramananda Santra (NCRA-TIFR Pune India), Ishwara-Chandra C. H. (NCRA-TIFR Pune India), Joe Jacob (Newman College Thodupuzha India)
https://a…

Investigation of the Axe-shaped Radio Galaxy J1051+5523 with uGMRT
We present a multi-frequency study of the bent-tail radio galaxy J1051+5523, located in the galaxy cluster WHL J105147.4+552309. This wide-angle tail (WAT) galaxy exhibits a complex radio morphology, characterised by a right-angled bend in the northern jet, which resembles an axe, and multiple kinks in the southern jet, as observed in the deep uGMRT radio observations. The radio power of J1051+5523 at 150 MHz is estimated to be $2.91 \times 10^{25}\,\mathrm{W\,Hz^{-1}}$, placing it in the trans…

Flipping particles with nodal circulations by general relativity under the presence of an inner perturber
Gonzalo Carlos de El\'ia, Macarena Zanardi, Carla Florencia Coronel, Agust\'in Dugaro
https://arxiv.org/abs/2509.19641

Flipping particles with nodal circulations by general relativity under the presence of an inner perturber
From a secular Hamiltonian up to the quadrupole level with general relativity (GR), we study nodal circulations with orbital flips of test particles of the Habitable Zone (HZ) around a solar-mass star, which are perturbed by an inner planetary-mass companion. Nodal circulations with orbital flips of an HZ test particle with eccentricity e2 are possible for any mass m1 and eccentricity e1 of the inner perturber and a suitable inclination i2. In particular, the greater the values of m1 and e2 , t…

A Synoptic Review of High-Frequency Oscillations as a Biomarker in Neurodegenerative Disease
Samin Yaser, Mahad Ali, Laura J. Brattain, Yang Jiang, VP Nguyen, Jing Xiang
https://arxiv.org/abs/2508.18712

A Synoptic Review of High-Frequency Oscillations as a Biomarker in Neurodegenerative Disease
High Frequency Oscillations (HFOs), rapid bursts of brain activity above 80 Hz, have emerged as a highly specific biomarker for epileptogenic tissue. Recent evidence suggests that HFOs are also present in Alzheimer's Disease (AD), reflecting underlying network hyperexcitability and offering a promising, noninvasive tool for early diagnosis and disease tracking. This synoptic review provides a comprehensive analysis of publicly available electroencephalography (EEG) datasets relevant to HFO rese…

Early release of low-frequency atlas of continuous gravitational waves
Vladimir Dergachev, Maria Alessandra Papa
https://arxiv.org/abs/2507.12161 https://

Early release of low-frequency atlas of continuous gravitational waves
We present the public release of the low-frequency atlas of continuous gravitational waves, covering signals with frequencies from 20 Hz to 200 Hz and frequency derivatives from -5e-11 to 5e-11 Hz/s. Compared to the previous atlas releases, this version demonstrates significant improvements in sensitivity and sky resolution. In the most sensitive region even the worst-case upper limits on gravitational wave strain are below 1e-25. The atlas data is being released ahead of the completion of the …

Magnetic measurements of Fermilab rapid-cycling Booster gradient magnets
J. DiMarco, D. Assell, T. Cummings, D. Johnson, V. Kashikhin, M. Kifarkis, J. Kuharik, J. Larson, M. Mubarak, S. Poopathi, K. Triplett
https://arxiv.org/abs/2509.13465

Magnetic measurements of Fermilab rapid-cycling Booster gradient magnets
Fermilab is upgrading its Booster synchrotron to increase ramp rate and intensity. This is part of the Proton Improvement Plan (PIP-II) that will allow the Main Injector to achieve proton beam power of 1.2 MW within the next few years. This upgrade includes running the 55-year-old Booster magnets at 20 Hz instead of the usual 15 Hz, and construction of some shorter and wider aperture versions of these combined-function gradient magnets. Magnetic measurements were performed to characterize the p…

Improving 8x8 TeraFET array sensitivity through liquid-nitrogen cooling in a compact low-noise cryostat
Jakob Holstein, Nicholas K. North, Arne Hof, Sanchit Kondawar, Dmytro B. But, Mohammed Salih, Lianhe Li, Edmund H. Linfield, A. Giles Davies, Joshua R. Freeman, Alexander Valavanis, Alvydas Lisauskas, Hartmut G. Roskos
https://

Improving 8x8 TeraFET array sensitivity through liquid-nitrogen cooling in a compact low-noise cryostat
The sensitivity of antenna-coupled field-effect transistors (TeraFETs) to terahertz (THz) radiation has been shown to improve continuously with decreasing temperature. In this work, we first present a quantitative evaluation of the temperature-dependent noise-equivalent power (NEP) of recently developed patch-antenna-coupled TeraFET detectors resonant at 540 GHz, with measurements down to 20 K. Based on these results, we project NEP values approaching 1 to 2 pW/$\sqrt{\textrm{Hz}}$ under effici…

Parameter Estimation for GW200208\_22 with Targeted Eccentric Numerical-relativity Simulations
Patricia McMillin (RIT), Katelyn J. Wagner (RIT), Giuseppe Ficarra (UNICAL), Carlos O. Lousto (RIT), Richard O'Shaughnessy (RIT)
https://arxiv.org/abs/2507.22862

Parameter Estimation for GW200208\_22 with Targeted Eccentric Numerical-relativity Simulations
We have analyzed LVK gravitational wave events that show some evidence of eccentricity from TEOBResumS modeling parameter estimations and have confronted them independently with full numerical generated waveforms from our bank of nearly two thousand simulations of binary black holes. We have used RIFT for Bayesian parameter estimation and found that GW200208\_{22} KDE estimates favor eccentricities $e_{20} = 0.217_{-0.184}^{+0.076}$ upon entering the LVK band at $\sim20$Hz within a 90\% confide…

Experimental investigation of the water exit of the accelerating circular cylinder
Intesaaf Ashraf, Stephane Dorbolo
https://arxiv.org/abs/2509.07691 https://

Experimental investigation of the water exit of the accelerating circular cylinder
We investigate the vortical dynamics generated during the forced exit of a circular cylinder through a quiescent free surface. While previous work on exit flows has largely emphasized cavity collapse and force generation, the formation and evolution of the starting vortex beneath the body have received much less attention. Using high-speed particle image velocimetry at up to 2000 Hz, we isolate and track the primary vortex shed during exit. The body motion is driven by constant vertical acceler…

Reducing suspension control noise with interferometric sensors -- an experimental concept
Nils Leander Weickhardt, Artem Basaleav, Oliver Gerberding
https://arxiv.org/abs/2507.18369

Reducing suspension control noise with interferometric sensors -- an experimental concept
One of the limiting noise sources of ground-based gravitational wave detectors at frequencies below 30 Hz is control-induced displacement noise. Compact laser interferometric sensors are a prime candidate for improved local displacement sensing. In this paper we present the design of an experiment that aims to demonstrate the advantages of interferometric sensors over shadow sensors. We focus on the compact balanced readout interferometer (COBRI) - a sensor currently in development that is base…

Isotopic Fingerprints of Proton-mediated Dielectric Relaxation in Solid and Liquid Water
Alexander Ryzhov, Pavel Kapralov, Mikhail Stolov, Anton Andreev, Aleksandra Radenovic, Viatcheslav Freger, Vasily Artemov
https://arxiv.org/abs/2509.09462

Isotopic Fingerprints of Proton-mediated Dielectric Relaxation in Solid and Liquid Water
We report cross-validated measurements of the isotope effect on dielectric relaxation for four isotopologues of ice and water, including the 1-10^5 Hz region, in which only sporadic and inconsistent measurements were previously available. In ice, the relaxation rates exhibit an activated temperature dependence with an isotope-independent activation energy. Across 248-273 K, the H_2O/D_2O relaxation rate ratio remains constant at 2.0 \pm 0.1. This scaling agrees with Kramers' theory in the high-…

Electro-optic frequency comb-empowered precise measurement of the dynamic frequency of a laser
Weiwei Yang, Xingyu Jia, Jingyi Wang, Xinlun Cai, Yang Li, Guanhao Wu
https://arxiv.org/abs/2508.16278

Electro-optic frequency comb-empowered precise measurement of the dynamic frequency of a laser
Frequency-modulated lasers (FMLs) are widely used in spectroscopy, biology, and LiDAR. The performance of these applications highly depends on the fast and precise tracking of the FMLs' absolute frequency, which remains a challenge. Here we demonstrate integrated lithium niobate electro-optic frequency combs with arbitrarily tunable repetition rates and a 29.45-nm bandwidth, enabling precise tracking of the absolute frequency of an FML with a chirp rate as high as $2\times10^{18}\,\mathrm{Hz/s}…

Reduction of Electromagnetic Interference in ultra-low noise Bimodal MEG & EEG
Jim Barnes, Lukasz Radzinski, Soudabeh Arsalani, Gunnar Waterstraat, Gabriel Curio, Jens Haueisen, Rainer K\"orber
https://arxiv.org/abs/2508.13758

Reduction of Electromagnetic Interference in ultra-low noise Bimodal MEG & EEG
Single-channel SQUID system technology, operating at a noise level of 100s of aT/$\sqrt{\textrm{Hz}}$, enables the non-invasive detection of synchronized spiking activity at the single-trial level via magnetoencephalography (MEG). However, when combined with simultaneous electroencephalography (EEG) recordings, the noise performance of the ultrasensitive MEG system can be greatly diminished. This issue negates some of the complementary qualities of these two recording methods. In addition, typi…

Reactive Model Predictive Contouring Control for Robot Manipulators
Junheon Yoon, Woo-Jeong Baek, Jaeheung Park
https://arxiv.org/abs/2508.09502 https://ar…

Reactive Model Predictive Contouring Control for Robot Manipulators
This contribution presents a robot path-following framework via Reactive Model Predictive Contouring Control (RMPCC) that successfully avoids obstacles, singularities and self-collisions in dynamic environments at 100 Hz. Many path-following methods rely on the time parametrization, but struggle to handle collision and singularity avoidance while adhering kinematic limits or other constraints. Specifically, the error between the desired path and the actual position can become large when executi…

Replaced article(s) found for astro-ph.IM. https://arxiv.org/list/astro-ph.IM/new
[1/1]:
- Outer Solar System spacecraft to probe the $\mu$Hz gravitational wave frontier
Matthew McQuinn, Casey McGrath

Scanned SQUID Microscope with High-speed Electrical Connectivity
Ian W. Haygood, Bochao Xu, John Biesecker, Michael L. Schneider
https://arxiv.org/abs/2509.07137 https://…

Scanned SQUID Microscope with High-speed Electrical Connectivity
We report on a scanned superconducting quantum interference device (SQUID) microscope operating in a cryogen-free cryostat, with the capability of up to forty RF connections with 20 GHz bandwidth to a device under test. The system utilizes planar gradiometric DC SQUIDs, which are fully shielded except for a pair of pickup coils with radii as small as 250 nm and have on chip field coils allowing for susceptometry. The system noise is 1.3 $μΦ_{0}/\sqrt{Hz}$ at the base temperature of 3.3 K. The…

Multi-messenger dynamic imaging of laser-driven shocks in water using a plasma wakefield accelerator
Mario D. Balcazar, Hai-En Tsai, Tobias Ostermayr, Paul T. Campbell, Qiang Chen, Cary Colgan, Gillis M. Dyer, Zachary Eisentraut, Eric Esarey, Cameron G. R. Geddes, Benjamin Greenwood, Anthony Gonsalves, Sahel Hakimi, Robert Jacob, Brendan Kettle, Paul King, Karl Krushelnick, Nuno Lemos, Eva Los, Yong Ma, Stuart P. D. Mangles, John Nees, Isabella M. Pagano, Carl Schroeder, Raspberry Simp…

Multi-messenger dynamic imaging of laser-driven shocks in water using a plasma wakefield accelerator
Understanding dense matter hydrodynamics is critical for predicting plasma behavior in environments relevant to laser-driven inertial confinement fusion. Traditional diagnostic sources face limitations in brightness, spatiotemporal resolution, and inability to detect relevant electromagnetic fields. In this work, we present a dual-probe, multi-messenger laser wakefield accelerator platform combining ultrafast X-rays and relativistic electron beams at 1 Hz, to interrogate a free-flowing water ta…

Crosslisted article(s) found for physics.atom-ph. https://arxiv.org/list/physics.atom-ph/new
[1/1]:
- Detecting milli-Hz gravitational waves with optical resonators
G. Barontini, X. Calmet, V. Guarrera, A. Smith, A. Vecchio

Synchronization Induced by Ultralight Dark Matter
Chrisna Setyo Nugroho
https://arxiv.org/abs/2507.11144 https://arxiv.org/pdf/2507.1…

Synchronization Induced by Ultralight Dark Matter
We study the possibility of ultralight bosonic dark matter (UlDM) to induce a synchronized behaviour on randomly evolving oscillators. We introduce a new interaction between UlDM and the oscillators and further demonstrate the occurence of the phase transition from disordered oscillators state into ordered state. For UlDM within the mass range of $10^{-14}\,\text{eV}/c^{2} \leq m_ϕ \leq 1 \,\text{eV}/c^{2}$ as well as the white noise strength lower than 0.01 Hz, the synchronization of randomly…

EEG-fused Digital Twin Brain for Autonomous Driving in Virtual Scenarios
Yubo Hou, Zhengxin Zhang, Ziyi Wang, Wenlian Lu, Jianfeng Feng, Taiping Zeng
https://arxiv.org/abs/2507.12263

EEG-fused Digital Twin Brain for Autonomous Driving in Virtual Scenarios
Current methodologies typically integrate biophysical brain models with functional magnetic resonance imaging(fMRI) data - while offering millimeter-scale spatial resolution (0.5-2 mm^3 voxels), these approaches suffer from limited temporal resolution (>0.5 Hz) for tracking rapid neural dynamics during continuous tasks. Conversely, Electroencephalogram (EEG) provides millisecond-scale temporal precision (<=1 ms sampling rate) for real-time guidance of continuous task execution, albeit constrain…

Inspired by machine learning optimization: can gradient-based optimizers solve cycle skipping in full waveform inversion given sufficient iterations?
Xinru Mu, Omar M. Saad, Shaowen Wang, Tariq Alkhalifah
https://arxiv.org/abs/2509.14919

Inspired by machine learning optimization: can gradient-based optimizers solve cycle skipping in full waveform inversion given sufficient iterations?
Full waveform inversion (FWI) iteratively updates the velocity model by minimizing the difference between observed and simulated data. Due to the high computational cost and memory requirements associated with global optimization algorithms, FWI is typically implemented using local optimization methods. However, when the initial velocity model is inaccurate and low-frequency seismic data (e.g., below 3 Hz) are absent, the mismatch between simulated and observed data may exceed half a cycle, a p…

All-sky search for short gravitational-wave bursts in the first part of the fourth LIGO-Virgo-KAGRA observing run
LIGO Scientific Collaboration, Virgo Collaboration, KAGRA Collaboration
https://arxiv.org/abs/2507.12374

All-sky search for short gravitational-wave bursts in the first part of the fourth LIGO-Virgo-KAGRA observing run
We present a search for short-duration gravitational-wave transients in data from the first eight months of Advanced LIGO-Virgo-KAGRA's fourth observing run, denoted O4a. We use four analyses which are sensitive to a wide range of potential signals lasting up to a few seconds in the 16-4096 Hz band. Excluding binary black hole merger candidates that were already identified by low-latency analyses, we find no statistically significant evidence for other gravitational-wave transients. We measure …

X-ray investigation of possible super-Eddington accretion in a radio-loud quasar at $z=6.13$
L. Ighina, A. Caccianiga, T. Connor, A. Moretti, F. Pacucci, C. Reynolds, J. Afonso, B. Arsioli, S. Belladitta, J. W. Broderick, D. Dallacasa, R. Della Ceca, F. Haardt, E. Lambrides, James K. Leung, A. Lupi, I. Matute, F. RIgamonti, P. Severgnini, N. Seymour, F. Tavecchio, C. Vignali

X-ray investigation of possible super-Eddington accretion in a radio-loud quasar at $z=6.13$
We present radio and X-ray observations of the recently discovered $z=6.13$ radio-powerful quasar RACS J032021.44$-$352104.1 using uGMRT, ATCA, LBA, and Chandra. The observed radio properties are in line with what is typically observed in high-$z$ radio quasars ($α_{\rm r}=0.72\pm 0.02$ and L$_{\rm 1.4GHz}=5.8 \pm 0.9 \times 10^{26}$ W Hz$^{-1}$). Despite the relatively low X-ray flux observed $F_{\rm 0.5-7.0 keV}=2.3\pm0.5 \times 10^{-14}$ erg sec$^{-1}$ cm$^{-2}$, the intrinsic luminosity in…

Quantum Noise Reduction in the Space-based Gravitational Wave Antenna DECIGO Using Optical Springs and Homodyne Detection scheme
Kenji Tsuji, Tomohiro Ishikawa, Kentaro Komori, Yutaro Enomoto, Yuta Michimura, Kurumi Umemura, Shoki Iwaguchi, Keiko Kokeyama, Seiji Kawamura
https://arxiv.org/abs/2509.17372

Quantum Noise Reduction in the Space-based Gravitational Wave Antenna DECIGO Using Optical Springs and Homodyne Detection scheme
The DECi-hertz Interferometer Gravitational-wave Observatory (DECIGO) is a planned space-based, next-generation gravitational wave detector aimed at observing primordial gravitational waves originating form cosmic inflation. This work focuses on reducing the quantum noise, in the instrument's observation band of 0.1 to 10 Hz, by employing optical springs and a homodyne detection scheme. Although detuning 1000\,km long arm cavities was previously considered ineffective due to quantum state degra…

The Einstein Telescope Pathfinder and its Vacuum System
Thomas H\"ohn (ET-PF), Adrian Schwenck (ET-PF), Thomas Th\"ummler (ET-PF), Joachim Wolf (ET-PF), Ralph Engel (ET-PF), Andreas Haungs (ET-PF), Einstein Telescope Pathfinder (ET-PF), collaboration
https://arxiv.org/abs/2508.16461

The Einstein Telescope Pathfinder and its Vacuum System
The Einstein Telescope (ET) will be the next generation gravitational wave observatory in Europe with a sensitivity reaching beyond the CMB into the dark era of the Universe. Each corner of the triangular baseline design is the center of two interferometers with 10 km long arms, one operated at room temperature, the other one with mirrors at cryogenic temperatures of 10-15 K that reduce the noise contribution at frequencies as low as 3 Hz. The ETpathfinder (ET-PF) project at Maastricht Universi…

Propeller effect in action: unveiling quenched accretion in the transient X-ray pulsar 4U 0115 63
Hua Xiao, Sergey S. Tsygankov, Valery F. Suleimanov, Alexander A. Mushtukov, Long Ji, Juri Poutanen
https://arxiv.org/abs/2509.09860

Propeller effect in action: unveiling quenched accretion in the transient X-ray pulsar 4U 0115+63
The Be/X-ray pulsar 4U 0115+63 underwent a type II outburst in 2023. After the outburst, similar to the outbursts in 2015 and 2017, the source decayed into a quiescent state. Two out of three XMM-Newton observations conducted after the 2023 outburst confirmed the source to be in a low-luminosity state at a level of $L_{\rm X} \sim 10^{33}\,\rm erg\,s^{-1}$. X-ray pulsations were detected at $\approx$0.277 Hz in both observations with a pulsed fraction exceeding 50%. The power density spectra sh…

High contrast few-cycle frontend with hybrid amplification for petawatt-class lasers
Roland S. Nagymih\'aly, Mikhail Kalashnikov, Levente Lehotai, Viktor Pajer, J\'anos Bohus, N\'ora Csernus-Luk\'acs, J\'anos Csontos, Szabolcs T\'oth, Bal\'azs Tari, Ignas Balciunas, Ernestas Kucinskas, Tomas Stanislauskas, \'Ad\'am B\"orzs\"onyi

High contrast few-cycle frontend with hybrid amplification for petawatt-class lasers
We present a 10 mJ-class laser system for seeding petawatt-class Ti:Sa lasers based on a hybrid, femtosecond optical parametric and negatively chirped Ti:Sa-based amplification architecture. Output pulses with 13 mJ energy, 14.4 fs transform limited duration, and high spatio-spectral quality are reached at 100 Hz repetition rate centered at 788 nm wavelength. By compressing 1 mJ energy with bulk glass and positively chirped mirrors, a pulse duration of 15.5 fs is measured. The intensity contras…

Cryogenic geometric anti-spring vibration isolation system
L. Feenstra, S. Dom\'inguez-Calder\'on, K. van Oosten, H. S. M. Bohemen, T. Benschop, M. Brinkman, M. Li, E. Hennes, R. Cornelissen, B. J. Hensen, A. Bertolini, M. P. Allan
https://arxiv.org/abs/2509.09010

Cryogenic geometric anti-spring vibration isolation system
The combination of low temperature and low vibration levels is key for ultrasensitive sensing applications such as scanning probe microscopy, large-mass quantum mechanics, and gravitational wave detection. Unfortunately, closed-cycle cryostats using pulse tube or GM coolers introduce strong low-frequency vibrations starting at 1 Hz. Mass-spring systems allow passive isolation, but for low-frequency applications the required spring constants and masses become impractical. Blade-based geometric a…

In Vivo Wideband MR Elastography for Assessing Age-Related Viscoelastic Changes of the Human Brain
Jakob Schattenfroh, Tom Meyer, Hossein S. Aghamiry, Noah Jaitner, Michael Fedders, Steffen G\"orner, Helge Herthum, Stefan Hetzer, Melanie Estrella, Guillaume Fl\'e, Paul Steinmann, Jing Guo, Ingolf Sack
https://arxiv.org/abs/2509.08…

In Vivo Wideband MR Elastography for Assessing Age-Related Viscoelastic Changes of the Human Brain
Magnetic Resonance Elastography (MRE) provides maps of brain biomechanics and is highly sensitive to alterations associated with aging and neurodegenerative disease. Most implementations use a single frequency or a narrow frequency band, limiting analysis of frequency-dependent viscoelastic parameters. We developed a dual-actuator wideband MRE (5-50 Hz) protocol and acquired wavefields at 13 frequencies in 24 healthy adults (young: 23-39 years; old: 50-63 years). Shear wave speed (SWS) maps wer…

Laser Interferometer Lunar Antenna (LILA): Advancing the U.S. Priorities in Gravitational-wave and Lunar Science
Karan Jani, Matthew Abernathy, Emanuele Berti, Valerio Boschi, Sukanya Chakrabarti, Alice Cocoros, John W. Conklin, Teviet Creighton, Simone Dell'Agnello, Jean-Claude Diels, Stephen Eikenberry, T. Marshall Eubanks, Kiranjyot Gill, Jonathan E. Grindlay, Kris Izquierdo, Jaesung Lee, Abraham Loeb, Philippe Lognonn\'e, Francesco Longo, Manuel Pichardo Marcano, Mark Panni…

Laser Interferometer Lunar Antenna (LILA): Advancing the U.S. Priorities in Gravitational-wave and Lunar Science
The Laser Interferometer Lunar Antenna (LILA) is a next-generation gravitational-wave (GW) facility on the Moon. By harnessing the Moon's unique environment, LILA fills a critical observational gap in the mid-band GW spectrum ($0.1 - 10$ Hz) between terrestrial detectors (LIGO, Virgo, KAGRA) and the future space mission LISA. Observations enabled by LILA will fundamentally transform multi-messenger astrophysics and GW probes of fundamental physics. LILA will measure the lunar deep interior bett…

A comprehensive study on radial velocity signals using ESPRESSO: Pushing precision to the 10 cm/s level
P. Figueira, J. P. Faria, A. M. Silva, A. Castro-Gonz\'alez, J. Gomes da Silva, S. G. Sousa, D. Bossini, M. R. Zapatero-Osorio, O. Balsalobre-Ruza, J. Lillo-Box, H. M. Tabernero, V. Adibekyan, R. Allart, S. Benatti, F. Bouchy, A. Cabral, S. Cristiani, X. Dumusque, J. I. Gonz\'alez-Hern\'andez, N. Hara, G. Lo Curto, C. Lovis, A. Mehner, P. Molaro, F. Pepe, N. C. Santos, D.…

A comprehensive study on radial velocity signals using ESPRESSO: Pushing precision to the 10 cm/s level
We analyse ESPRESSO data for the stars HD10700, HD20794, HD102365, and HD304636 acquired via its Guaranteed Time Observations (GTO) programme. We characterise the stars' radial velocity (RV) signals down to a precision of 10 cm/s on timescales ranging from minutes to planetary periods falling within the host's habitable zone (HZ). We study the RV signature of pulsation, granulation, and stellar activity, inferring the potential presence of planets around these stars. Thus, we outline the popula…

Vacuum squeezing enhanced micrometer scale vapor cell magnetometer
Shahar Monsa, Yair Chasid, Michael Shuldiner, Shmuel Sternklar, Eliran Talker
https://arxiv.org/abs/2507.07672

Vacuum squeezing enhanced micrometer scale vapor cell magnetometer
We report on an optical magnetometer enhanced by vacuum-squeezed light, employing an Mx magnetometer based on $^{87}$Rb vapor in a micrometer-scale cell (~100 $μ$m). Using the well-established polarization self-rotation effect in a room-temperature $^{87}$Rb vapor cell, we achieve -3 dB of vacuum squeezing within the noise spectral window of 100 Hz to several MHz, corresponding to 3.5 dB squeezing when accounting for optical losses. Leveraging this level of squeezing, we demonstrate a magnetic…

Jiggled interferometer: Ground-based gravitational wave detector using rapidly-repeated free-falling test masses
Shoki Iwaguchi, Bin Wu, Kurumi Umemura, Tomohiro Ishikawa, Kenji Tsuji, Ryota Nishimura, Yuta Michimura, Yutaro Enomoto, Soichiro Morisaki, Yoichi Aso, Tomotada Akutsu, Keiko Kokeyama, Seiji Kawamura
https://arxiv.org/abs/2509.1…

Jiggled interferometer: Ground-based gravitational wave detector using rapidly-repeated free-falling test masses
We propose the Jiggled Interferometer (JIGI), a novel ground-based gravitational wave detector with space-like sensitivity. Using rapidly-repeated free-fall test masses, JIGI eliminates seismic and suspension thermal noise during free fall. Compared to the Juggled Interferometer, it offers improved angular stability and avoids tracking lasers. We analyze detrending--a required step to remove actuation-induced noise--and show sensitivity gains of about four orders of magnitude in the 0.1-0.3 Hz …

Optimal robust detection statistics for pulsar timing arrays
Rutger van Haasteren, Bruce Allen, Joseph D. Romano
https://arxiv.org/abs/2509.06489 https://a…

Optimal robust detection statistics for pulsar timing arrays
Pulsar timing arrays (PTAs) seek to detect a nano-Hz stochastic gravitational-wave background (GWB) by searching for the characteristic Hellings and Downs angular pattern of timing residual correlations. So far, the evidence remains below the conventional $5$-$σ$ threshold, as assessed using the literature-standard ``optimal cross-correlation detection statistic''. While this quadratic combination of cross-correlated data maximizes the {\em deflection} (signal-to-noise ratio), it does not maxi…

First release of LiteBIRD simulations from an end-to-end pipeline
M. Bortolami, N. Raffuzzi, L. Pagano, G. Puglisi, A. Anand, A. J. Banday, P. Campeti, G. Galloni, A. I. Lonappan, M. Monelli, M. Tomasi, G. Weymann-Despres, D. Adak, E. Allys, J. Aumont, R. Aurvik, C. Baccigalupi, M. Ballardini, R. B. Barreiro, N. Bartolo, S. Basak, M. Bersanelli, A. Besnard, T. Brinckmann, E. Calabrese, E. Carinos, A. Carones, F. J. Casas, K. Cheung, M. Citran, L. Clermont, F. Columbro, G. Coppi, A. Cop…

First release of LiteBIRD simulations from an end-to-end pipeline
The LiteBIRD satellite mission aims at detecting Cosmic Microwave Background $B$ modes with unprecedented precision, targeting a total error on the tensor-to-scalar ratio $r$ of $δr \sim 0.001$. Operating from the L2 Lagrangian point of the Sun-Earth system, LiteBIRD will survey the full sky across 15 frequency bands (34 to 448 GHz) for 3 years.The current LiteBIRD baseline configuration employs 4508 detectors sampling at 19.1 Hz to achieve an effective polarization sensitivity of $ 2 μ\mathr…