Tootfinder

A local sign decomposition for symplectic self-dual Galois representations of rank two
Ashay Burungale, Shinichi Kobayashi, Kentaro Nakamura, Kazuto Ota
https://arxiv.org/abs/2508.17776

A local sign decomposition for symplectic self-dual Galois representations of rank two
We prove the existence of a new structure on the first Galois cohomology of generic families of symplectic self-dual $p$-adic representations of $G_{\mathbb{Q}_p}$ of rank two (a local sign decomposition): a functorial decomposition into free rank one Lagrangian submodules which encodes the $p$-adic variation of Bloch--Kato subgroups via completed epsilon constants, mirroring a symplectic structure. The local sign decomposition has diverse local as well as global arithmetic consequences. This…

Head-Related Transfer Function Individualization Using Anthropometric Features and Spatially Independent Latent Representation
Ryan Niu, Shoichi Koyama, Tomohiko Nakamura
https://arxiv.org/abs/2508.16176

Head-Related Transfer Function Individualization Using Anthropometric Features and Spatially Independent Latent Representation
A method for head-related transfer function (HRTF) individualization from the subject's anthropometric parameters is proposed. Due to the high cost of measurement, the number of subjects included in many HRTF datasets is limited, and the number of those that include anthropometric parameters is even smaller. Therefore, HRTF individualization based on deep neural networks (DNNs) is a challenging task. We propose a HRTF individualization method using the latent representation of HRTF magnitude ob…

Massive extended streamers feed high-mass young stars
Fernando A. Olguin, Patricio Sanhueza, Adam Ginsburg, Huei-Ru Vivien Chen, Kei E. I. Tanaka, Xing Lu, Kaho Morii, Fumitaka Nakamura, Shanghuo Li, Yu Cheng, Qizhou Zhang, Qiuyi Luo, Yoko Oya, Takeshi Sakai, Masao Saito, Andr\'es E. Guzm\'an
https://arxiv.org/abs/2508.15889…

Massive extended streamers feed high-mass young stars
Stars are born in a variety of environments that determine how they gather gas to achieve their final masses. It is generally believed that disks are ubiquitous around protostars as a result of angular momentum conservation and are natural places to grow planets. As such, they are proposed to be the last link in the inflow chain from the molecular cloud to the star. However, disks are not the only form that inflows can take. Here we report on high-resolution observations performed with the Atac…

VIR-Bench: Evaluating Geospatial and Temporal Understanding of MLLMs via Travel Video Itinerary Reconstruction
Hao Wang, Eiki Murata, Lingfang Zhang, Ayako Sato, So Fukuda, Ziqi Yin, Wentao Hu, Keisuke Nakao, Yusuke Nakamura, Sebastian Zwirner, Yi-Chia Chen, Hiroyuki Otomo, Hiroki Ouchi, Daisuke Kawahara
https://arxiv.org/abs/2509.19002

Crosslisted article(s) found for cs.AI. https://arxiv.org/list/cs.AI/new
[7/8]:
- VIR-Bench: Evaluating Geospatial and Temporal Understanding of MLLMs via Travel Video Itinerary R...
Wang, Murata, Zhang, Sato, Fukuda, Yin, Hu, Nakao, Nakamura, Zwirner, Chen, Otomo, Ouchi, Kawahara

Stability and optical quality of liquid crystal films as high repetition rate plasma mirrors in staged laser-plasma accelerators
A. Vazquez, A. Jewell, M. Cole, A. Abdi, T. K. Le, A. McIlvenny, N. Czapla, A. J. Gonsalves, K. Nakamura, D. W. Schumacher, Z. Eisentraut, C. B. Schroeder, J. van Tilborg, J. Osterhoff, E. Esarey, L. Obst-Huebl
https://

Stability and optical quality of liquid crystal films as high repetition rate plasma mirrors in staged laser-plasma accelerators
Staging multiple laser-plasma accelerators (LPAs), each driven by its own laser pulse, is a promising technique for reaching higher particle energies than achievable in a single LPA. However, introducing subsequent laser pulses for post-acceleration in staged LPA geometries presents a significant challenge for conventional optics. Due to the focused, high-intensity nature of the laser beam interacting with the electron beam, the fluence on the coupling mirror surpasses the damage threshold of a…

Strichartz estimates involving orthonormal systems at the critical summability exponent
Guoxia Feng, Manli Song, Huoxiong Wu
https://arxiv.org/abs/2507.14974

Strichartz estimates involving orthonormal systems at the critical summability exponent
The primary objective of this paper is to investigate the orthonormal Strichartz estimates at the critical summability exponent for the Schrödinger operator $e^{itΔ}$ with initial data from the homogeneous Sobolev space $\dot{H}^s (\mathbb{R}^n)$. We prove new global strong-type orthonormal Strichartz estimates in the interior of $ODCA$ at the optimal summability exponent $α=q$, thereby substantially supplymenting the work of Bez-Hong-Lee-Nakamura-Sawano \cite{Bez-Hong-Lee-Nakamura-Sawano}. …

Successive orthorhombic distortions in kagome metals by molecular orbital formation
Ryo Misawa, Shunsuke Kitou, Rinsuke Yamada, Tobi Gaggl, Ryota Nakano, Yudai Shibata, Yoshihiro Okamura, Markus Kriener, Yuiga Nakamura, Yoshichika \=Onuki, Youtarou Takahashi, Taka-hisa Arima, Milena Jovanovic, Leslie M. Schoop, Max Hirschberger
https://arx…

Successive orthorhombic distortions in kagome metals by molecular orbital formation
The kagome lattice, with its inherent frustration, hosts a plethora of exotic phenomena, including the emergence of $3\mathbf{q}$ charge density wave order. The high rotational symmetry, required to realize such an unconventional charge order, is broken in many kagome materials by orthorhombic distortions at high temperature, the origin of which is much less discussed despite their ubiquity. In this study, synchrotron X-ray diffraction reveals a structural phase transition from a parent hexagon…

Dynatune: Dynamic Tuning of Raft Election Parameters Using Network Measurement
Kohya Shiozaki, Junya Nakamura
https://arxiv.org/abs/2507.15154 https://

Dynatune: Dynamic Tuning of Raft Election Parameters Using Network Measurement
Raft is a leader-based consensus algorithm that implements State Machine Replication (SMR), which replicates the service state across multiple servers to enhance fault tolerance. In Raft, the servers play one of three roles: leader, follower, or candidate. The leader receives client requests, determines the processing order, and replicates them to the followers. When the leader fails, the service must elect a new leader to continue processing requests, during which the service experiences an ou…

Motional representation; the ability to predict odor characters using molecular vibrations
Yuki Harada, Shuichi Maeda, Junwei Shen, Taku Misonou, Hirokazu Hori, Shinichiro Nakamura
https://arxiv.org/abs/2509.16245

Motional representation; the ability to predict odor characters using molecular vibrations
The prediction of odor characters is still impossible based on the odorant molecular structure. We designed a CNN-based regressor for computed parameters in molecular vibrations (CNN\_vib), in order to investigate the ability to predict odor characters of molecular vibrations. In this study, we explored following three approaches for the predictability; (i) CNN with molecular vibrational parameters, (ii) logistic regression based on vibrational spectra, and (iii) logistic regression with molecu…

Observation of the Galactic Center in the Sub-MeV Gamma-Ray Band with an Electron-Tracking Compton Camera
Tomonori Ikeda, Atsushi Takada, Taito Takemura, Kei Yoshikawa, Yuta Nakamura, Ken Onozaka, Mitsuru Abe, Yoshitaka Mizumura, Toru Tanimori
https://arxiv.org/abs/2509.15851

Observation of the Galactic Center in the Sub-MeV Gamma-Ray Band with an Electron-Tracking Compton Camera
We report the first detection of gamma-ray emission from the Galactic center in the 150-600 keV band using a linear, imaging-spectroscopy approach used in common telescopes with an electron-tracking Compton camera (ETCC) aboard the SMILE-2+ balloon experiment. A one-day flight over Australia resulted in a significant gamma-ray detection in the light curve and revealed a $7.9σ$ excess in the image map from the Galactic center region. These results, obtained through a simple and unambiguous anal…

Drum-to-Vocal Percussion Sound Conversion and Its Evaluation Methodology
Rinka Nobukawa, Makito Kitamura, Tomohiko Nakamura, Shinnosuke Takamichi, Hiroshi Saruwatari
https://arxiv.org/abs/2509.16862

Drum-to-Vocal Percussion Sound Conversion and Its Evaluation Methodology
This paper defines the novel task of drum-to-vocal percussion (VP) sound conversion. VP imitates percussion instruments through human vocalization and is frequently employed in contemporary a cappella music. It exhibits acoustic properties distinct from speech and singing (e.g., aperiodicity, noisy transients, and the absence of linguistic structure), making conventional speech or singing synthesis methods unsuitable. We thus formulate VP synthesis as a timbre transfer problem from drum sounds,…

Generation of frequency-bin-encoded dual-rail cluster states via time-frequency multiplexing of microwave photonic qubits
Zhiling Wang, Takeaki Miyamura, Yoshiki Sunada, Keika Sunada, Jesper Ilves, Kohei Matsuura, Yasunobu Nakamura
https://arxiv.org/abs/2508.10990

Generation of frequency-bin-encoded dual-rail cluster states via time-frequency multiplexing of microwave photonic qubits
Cluster states are a class of multi-qubit entangled states with broad applications such as quantum metrology and one-way quantum computing. Here, we present a protocol to generate frequency-bin-encoded dual-rail cluster states using a superconducting circuit consisting of a fixed-frequency transmon qubit, a resonator and a Purcell filter. We implement time-frequency multiplexing by sequentially emitting co-propagating microwave photons of distinct frequencies. The frequency-bin dual-rail encodi…

Clustered eigenvalue problem for glassy state relaxation and its inverse problem
Shuli Chen, Maarten V. de Hoop, Youjun Deng, Ching-Lung Lin, Gen Nakamura
https://arxiv.org/abs/2509.16714

Clustered eigenvalue problem for glassy state relaxation and its inverse problem
For computational convenience, a Prony series approximation of the stretched exponential relaxation function of homogeneous glasses has been proposed (J. Mauro, Y. Mauro, 2018), which is the extended Burgers model known for viscoelasticity equations. The authors of [P. Loreti and D. Sforza, 2019] initiated a spectral analysis of glass relaxation along this line, and gave some numerical results on clusters of eigenvalues. A theoretical justification of the results and development of further nume…

Sub-femtosecond stabilization of multicore fiber for high-fidelity quantum networking at 100% duty cycle
Takuma Nakamura, Nazanin Hoghooghi, Nicolas Fontaine, Tetsuya Hayashi, Takuji Nagashima, Nicholas V. Nardelli, Dileep V. Reddy, Martin J. Stevens, Tara Fortier, Lynden K. Shalm, Franklyn Quinlan
https://arxiv.org/abs/2509.17989

Sub-femtosecond stabilization of multicore fiber for high-fidelity quantum networking at 100% duty cycle
Originally envisioned as a solution for the capacity crunch in telecommunications networks, multicore fibers (MCF) are contributing to scientific fields beyond telecom, such as sensing and metrology. Confined within the same cladding, the cores of MCF have a high degree of noise correlation which can be harnessed for a variety of applications. Here, we investigate MCF as a solution to the challenging problem of quantum and classical light co-existence in quantum networks by operating the quantu…

Theoretical Detailed Analyses for DC readout and a Fabri-P\'erot gravitational-wave detector
Kouji Nakamura
https://arxiv.org/abs/2508.11098 https://ar…

Theoretical Detailed Analyses for DC readout and a Fabri-Pérot gravitational-wave detector
The quantum expectation value and the stationary noise spectral density for a Fabri-Pérot gravitational-wave detector with a DC readout scheme are discussed in detail only through the quantum electrodynamics of lasers and the Heisenberg equations of mirrors' motion. We demonstrate that the initial conditions of the mirrors' motion concentrate around the fundamental frequency of the pendulum and are not related to the frequency range of our interest. Although in the ideal case, there is a conse…

Coupled-channel analysis for vector charmonia and their nature
Satoshi X. Nakamura (Shandong University)
https://arxiv.org/abs/2509.12925 https://arxiv.org…

Coupled-channel analysis for vector charmonia and their nature
High-precision $e^+e^-\to c\bar{c}$ data (20 final states) from the BESIII and Belle in $\sqrt{s}=3.75-4.7$ GeV are analyzed with a semi three-body unitary coupled-channel model. Vector charmonium poles are extracted from the amplitudes obtained from the fit. We find well-known $ψ$ states listed in the PDG, and also several states near open-charm thresholds. The compositeness of the near-threshold poles suggests that $ψ(4040)$ could mainly consist of a $D^*\bar{D}^*$-molecule component, rathe…

Open-sci-ref-0.01: open and reproducible reference baselines for language model and dataset comparison
Marianna Nezhurina, Taishi Nakamura, Timur Carstensen, Niccol\`o Ajroldi, Ville Komulainen, David Salinas, Jenia Jitsev
https://arxiv.org/abs/2509.09009

Open-sci-ref-0.01: open and reproducible reference baselines for language model and dataset comparison
We introduce open-sci-ref, a family of dense transformer models trained as research baselines across multiple model (0.13B to 1.7B parameters) and token scales (up to 1T) on 8 recent open reference datasets. Evaluating the models on various standardized benchmarks, our training runs set establishes reference points that enable researchers to assess the sanity and quality of alternative training approaches across scales and datasets. Intermediate checkpoints allow comparison and studying of the …

When is it (im)possible to respect all individuals' preferences under uncertainty?
Kensei Nakamura
https://arxiv.org/abs/2508.12542 https://arxiv.org/p…

When is it (im)possible to respect all individuals' preferences under uncertainty?
When aggregating Subjective Expected Utility preferences, the Pareto principle leads to an impossibility result unless the individuals have a common belief. This paper examines the source of this impossibility in more detail by considering the aggregation of a general class of incomplete preferences that can represent gradual ambiguity perceptions. Our result shows that the planner cannot avoid ignoring some individuals unless there is a probability distribution that all individuals agree is mo…

Phase transitions of eutectic high entropy alloy AlCoCrFeNi2.1 under shock compression
Sophie Parsons, Kento Katagiri, Hangman Chen, Anirudh Hari, Tharun Reddy, Sara J. Irvine, Laura Madril, Dorian Luccioni, Jie Ren, Wuxian Yang, Norimasa Ozaki, Alexis Amouretti, Ryosuke Kodama, Hirotaka Nakamura, Yusuke Nakanishi, Masato Ota, Yusuke Seto, Sota Takagi, Takuo Okuchi, Yuhei Umeda, Yuichi Inubushi, Kohei Miyanishi, Keiichi Sueda, Tadashi Togashi, Makina Yabashi, Toshinori Yabuuchi, Wanghu…

Phase transitions of eutectic high entropy alloy AlCoCrFeNi2.1 under shock compression
High entropy alloys (HEAs) are a new class of metals that exhibit unique mechanical performance. Among HEAs, additively manufactured eutectic high entropy alloys (AM-EHEAs) have recently emerged as candidate materials for use in extreme conditions due to their simultaneous high strength and ductility. However, the deformation and structural evolution of AM-EHEAs under conditions of high pressure have not been well characterized, limiting their use in extreme applications. We present dynamic com…

🇺🇦 #NowPlaying on KEXP's #PacificNotions
Tomotsugu Nakamura:
🎵 transparency
#TomotsuguNakamura
https://tomotsugu.bandcamp.com/track/transparency
https://open.spotify.com/track/3zh9dUtnhCu3xqUXjrUhsc

Towards Safe Imitation Learning via Potential Field-Guided Flow Matching
Haoran Ding, Anqing Duan, Zezhou Sun, Leonel Rozo, No\'emie Jaquier, Dezhen Song, Yoshihiko Nakamura
https://arxiv.org/abs/2508.08707

Towards Safe Imitation Learning via Potential Field-Guided Flow Matching
Deep generative models, particularly diffusion and flow matching models, have recently shown remarkable potential in learning complex policies through imitation learning. However, the safety of generated motions remains overlooked, particularly in complex environments with inherent obstacles. In this work, we address this critical gap by proposing Potential Field-Guided Flow Matching Policy (PF2MP), a novel approach that simultaneously learns task policies and extracts obstacle-related informat…

Beyond ensemble averaging: Parallelized single-shot readout of hole capture in diamond
Richard Monge, Yuki Nakamura, Olaf Bach, Jason Shao, Artur Lozovoi, Alexander A. Wood, Kento Sasaki, Kensuke Kobayashi, Tom Delord, Carlos A. Meriles
https://arxiv.org/abs/2507.11722

Beyond ensemble averaging: Parallelized single-shot readout of hole capture in diamond
Understanding the generation, transport and capture of charge carriers in semiconductors is of fundamental technological importance. However, the ensemble measurement techniques ubiquitous in electronics offer limited insight into the nanoscale environment that is crucial to the operation of modern quantum-electronic devices. Here, we combine widefield optical microscopy with precision spectroscopy to examine the capture of photogenerated holes by negatively charged nitrogen vacancy (NV-) cente…

Multi-Sampling-Frequency Naturalness MOS Prediction Using Self-Supervised Learning Model with Sampling-Frequency-Independent Layer
Go Nishikawa, Wataru Nakata, Yuki Saito, Kanami Imamura, Hiroshi Saruwatari, Tomohiko Nakamura
https://arxiv.org/abs/2507.14647

Multi-Sampling-Frequency Naturalness MOS Prediction Using Self-Supervised Learning Model with Sampling-Frequency-Independent Layer
We introduce our submission to the AudioMOS Challenge (AMC) 2025 Track 3: mean opinion score (MOS) prediction for speech with multiple sampling frequencies (SFs). Our submitted model integrates an SF-independent (SFI) convolutional layer into a self-supervised learning (SSL) model to achieve SFI speech feature extraction for MOS prediction. We present some strategies to improve the MOS prediction performance of our model: distilling knowledge from a pretrained non-SFI-SSL model and pretraining …

Difference of Constrained Patterns in Logically Constrained Term Rewrite Systems (Full Version)
Naoki Nishida, Misaki Kojima, Yuto Nakamura
https://arxiv.org/abs/2507.04080

Difference of Constrained Patterns in Logically Constrained Term Rewrite Systems (Full Version)
Considering patterns as sets of their instances, a difference operator over patterns computes a finite set of two given patterns, which represents the difference between the dividend pattern and the divisor pattern. A complement of a pattern is a set of patterns, the ground constructor instances of which comprise the complement set of the ground constructor instances of the former pattern. Given finitely many unconstrained linear patterns, using a difference operator over linear patterns, a kno…

EmoSSLSphere: Multilingual Emotional Speech Synthesis with Spherical Vectors and Discrete Speech Tokens
Joonyong Park, Kenichi Nakamura
https://arxiv.org/abs/2508.11273 https://…

EmoSSLSphere: Multilingual Emotional Speech Synthesis with Spherical Vectors and Discrete Speech Tokens
This paper introduces EmoSSLSphere, a novel framework for multilingual emotional text-to-speech (TTS) synthesis that combines spherical emotion vectors with discrete token features derived from self-supervised learning (SSL). By encoding emotions in a continuous spherical coordinate space and leveraging SSL-based representations for semantic and acoustic modeling, EmoSSLSphere enables fine-grained emotional control, effective cross-lingual emotion transfer, and robust preservation of speaker id…

What a beautiful smile has the Japanese 🇯🇵 climber Mao Nakamura 🧗‍♀️. I hold an extra pair of fingers crossed 🤞 for her to top just to see her smile. Not to mention that she keeps smiling

Replaced article(s) found for quant-ph. https://arxiv.org/list/quant-ph/new
[4/4]:
- Subspace-Protected Topological Phases and Bulk-Boundary Correspondence
Kenji Shimomura, Ryo Takami, Daichi Nakamura, Masatoshi Sato

Unveiling the Listener Structure Underlying K-pop's Global Success: A Large-Scale Listening Data Analysis
Ryota Nakamura, Keita Nishimoto, Ichiro Sakata, Kimitaka Asatani
https://arxiv.org/abs/2509.06606

Unveiling the Listener Structure Underlying K-pop's Global Success: A Large-Scale Listening Data Analysis
From the mid-2000s to the 2010s, K-pop moved beyond its status as a regionally popular genre in Asia and established itself as a global music genre with enthusiastic fans around the world. However, little is known about how the vast number of music listeners across the globe have listened to and perceived K-pop. This study addresses this question by analyzing a large-scale listening dataset from Last.fm. An analysis of the distribution of play counts reveals that K-pop experienced a significant…

How Can Input Reformulation Improve Tool Usage Accuracy in a Complex Dynamic Environment? A Study on $\tau$-bench
Venkatesh Mishra, Amir Saeidi, Satyam Raj, Mutsumi Nakamura, Jayanth Srinivasa, Gaowen Liu, Ali Payani, Chitta Baral
https://arxiv.org/abs/2508.20931

How Can Input Reformulation Improve Tool Usage Accuracy in a Complex Dynamic Environment? A Study on $τ$-bench
Recent advances in reasoning and planning capabilities of large language models (LLMs) have enabled their potential as autonomous agents capable of tool use in dynamic environments. However, in multi-turn conversational environments like $τ$-bench, these agents often struggle with consistent reasoning, adherence to domain-specific policies, and extracting correct information over a long horizon of tool-calls and conversation. To capture and mitigate these failures, we conduct a comprehensive m…

Sparse BEV Fusion with Self-View Consistency for Multi-View Detection and Tracking
Keisuke Toida, Taigo Sakai, Naoki Kato, Kazutoyo Yokota, Takeshi Nakamura, Kazuhiro Hotta
https://arxiv.org/abs/2509.08421

Sparse BEV Fusion with Self-View Consistency for Multi-View Detection and Tracking
Multi-View Multi-Object Tracking (MVMOT) is essential for applications such as surveillance, autonomous driving, and sports analytics. However, maintaining consistent object identities across multiple cameras remains challenging due to viewpoint changes, lighting variations, and occlusions, which often lead to tracking errors.Recent methods project features from multiple cameras into a unified Bird's-Eye-View (BEV) space to improve robustness against occlusion. However, this projection introduc…

Machine Learning for Polymer Chemical Resistance to Organic Solvents
Shogo Kunieda, Mitsuru Yambe, Hiromori Murashima, Takeru Nakamura, Toshiaki Shintani, Hitoshi Kamijima, Yoshihiro Hayashi, Yosuke Hanawa, Ryo Yoshida
https://arxiv.org/abs/2509.05344

Machine Learning for Polymer Chemical Resistance to Organic Solvents
Predicting the chemical resistance of polymers to organic solvents is a longstanding challenge in materials science, with significant implications for sustainable materials design and industrial applications. Here, we address the need for interpretable and generalizable frameworks to understand and predict polymer chemical resistance beyond conventional solubility models. We systematically analyze a large dataset of polymer solvent combinations using a data-driven approach. Our study reveals th…

Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device
Masashi Tokuda, Fumiya Matsumoto, Noriaki Maeda, Tomo Higashihara, Mai Nakao, Mori Watanabe, Sanghyun Lee, Ryoya Nakamura, Masaki Maeda, Nan Jiang, Di Yue, Hideki Narita, Kazushi Aoyama, Takeshi Mizushima, Jun-ichiro Ohe, Teruo Ono, Xiaofeng Jin, Kensuke Kobayashi, Yasuhiro Niimi

Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device
Topological superconductors are one of the intriguing material groups from the viewpoint of not only condensed matter physics but also industrial application such as quantum computers based on Majorana fermion. For the real application, developments of the thin-film topological superconductors are highly desirable. Bi/Ni bilayer is a possible candidate for thin-film chiral superconductors where the time-reversal symmetry is broken. Here we report the phase shift of resistance oscillations by ha…

Probing KSVZ Axion Dark Matter near 5.9 GHz Using a 8-Cell Cavity Haloscope
Saebyeok Ahn, Caglar Kutlu, Soohyung Lee, SungWoo Youn, Sergey V. Uchaikin, Sungjae Bae, Junu Jeong, Arjan F. van Loo, Yasunobu Nakamura, Seongjeong Oh, Jihn E. Kim, Yannis K. Semertzidis
https://arxiv.org/abs/2507.04344

Probing KSVZ Axion Dark Matter near 5.9 GHz Using a 8-Cell Cavity Haloscope
We report on a search for axion dark matter in the frequency range near 5.9 GHz, conducted using the haloscope technique. The experiment employed an 8-cell microwave resonator designed to extend the accessible frequency range by a multi-fold factor relative to conventional single-cell configurations, while maintaining a large detection volume. To enhance sensitivity, a flux-driven Josephson parametric amplifier (JPA) operating near the quantum noise limit was utilized, together with a sideband-…

Quantitative evaluations of stability and convergence for solutions of semilinear Klein--Gordon equation
Takuya Tsuchiya, Makoto Nakamura
https://arxiv.org/abs/2508.21659 https:…

Quantitative evaluations of stability and convergence for solutions of semilinear Klein--Gordon equation
We perform some simulations of the semilinear Klein--Gordon equation with a power-law nonlinear term and propose each of the quantitative evaluation methods for the stability and convergence of numerical solutions. We also investigate each of the thresholds in the methods by varying the amplitude of the initial value and the mass, and propose appropriate values.

Partially rational preferences under ambiguity
Kensei Nakamura, Shohei Yanagita
https://arxiv.org/abs/2509.11660 https://arxiv.org/pdf/2509.11660

Partially rational preferences under ambiguity
Completeness and transitivity are standard rationality conditions in economics. However, under ambiguity, decision makers sometimes violate these requirements because of the difficulty of forming accurate predictions about ambiguous events. Motivated by this, we study various ambiguity preferences that partially satisfy completeness and transitivity. Our characterization results show that completeness and a novel yet natural weakening of transitivity correspond to two opposite ways of using mul…

Potassium abundances in extremely metal poor stars: Implications for nucleosynthesis in the final stages of massive star evolution
M. N. Ishigaki, N. Tominaga, W. Aoki, T. Takiwaki, K. Nakamura, N. Iwamoto, K. Nomoto, C. Kobayashi
https://arxiv.org/abs/2508.20484

Potassium abundances in extremely metal poor stars: Implications for nucleosynthesis in the final stages of massive star evolution
We present a potassium (K) abundance analysis in extremely metal-poor (EMP) stars based on high-resolution ($R\sim 60000$) spectra obtained with the High Dispersion Spectrograph on the Subaru Telescope, covering the K I resonance lines at 766 and 769 nm. One-dimensional local thermodynamic equilibrium (LTE) abundances of K and other elements, including Na, Mg, Ca, Ti, Cr, and Ni, were derived using spectral synthesis. Non-local thermodynamic equilibrium (NLTE) corrections were applied to the K …

Replaced article(s) found for cond-mat.str-el. https://arxiv.org/list/cond-mat.str-el/new
[2/2]:
- Subspace-Protected Topological Phases and Bulk-Boundary Correspondence
Kenji Shimomura, Ryo Takami, Daichi Nakamura, Masatoshi Sato

Replaced article(s) found for nucl-th. https://arxiv.org/list/nucl-th/new
[1/1]:
- Proper effective temperature and order parameters in relativistic non-equilibrium steady states
Shin Nakamura, Fuminori Okabayashi

Beam test results of the Intermediate Silicon Tracker for sPHENIX
C. W. Shih, G. Nukazuka, Y. Sugiyama, Y. Akiba, H. En'yo, T. Hachiya, S. Hasegawa, M. Hata, H. Imai, C. M. Kuo, M. Morita, I. Nakagawa, Y. Nakamura, G. Nakano, Y. Namimoto, R. Nouicer, M. Shibata, M. Shimomura, R. Takahama, K. Toho, M. Tsuruta, M. Watanabe
https://arxiv.…

Beam test results of the Intermediate Silicon Tracker for sPHENIX
The Intermediate Silicon Tracker (INTT), a two-layer barrel silicon strip tracker, is a key component of the tracking system for sPHENIX at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. The INTT is designed to enable the association of reconstructed tracks with individual RHIC bunch crossings. To evaluate the performance of preproduction INTT ladders and the readout chain, a beam test was conducted at the Research Center for Accelerator and Radioisotope Science, …

Inhomogeneous stellar mixing in the final hours before the Cassiopeia A supernova
Toshiki Sato, Kai Matsunaga, Hiroyuki Uchida, Satoru Katsuda, Koh Takahashi, Hideyuki Umeda, Tomoya Takiwaki, Ryo Sawada, Takashi Yoshida, Ko Nakamura, Yui Kuboike, Paul P. Plucinsky, John P. Hughes
https://arxiv.org/abs/2507.07563

Inhomogeneous stellar mixing in the final hours before the Cassiopeia A supernova
Understanding stars and their evolution is a key goal of astronomical research and has long been a focus of human interest. In recent years, theorists have paid much attention to the final interior processes within massive stars, as they can be essential for revealing neutrino-driven supernova mechanisms and other potential transients of massive star collapse. However, it is challenging to observe directly the last hours of a massive star before explosion, since it is the supernova event that t…

Persistent-DPO: A novel loss function and hybrid learning for generative quantum eigensolver
Junya Nakamura, Shinichiro Sanji
https://arxiv.org/abs/2509.08351 https://

Persistent-DPO: A novel loss function and hybrid learning for generative quantum eigensolver
We study the generative quantum eigensolver (GQE)~\cite{nakaji2024generative}, which trains a classical generative model to produce quantum circuits with desired properties such as describing molecular ground states. We introduce two methods to improve GQE. First, we identify a limitation of direct preference optimization (DPO) when used as the loss function in GQE, and propose Persistent-DPO (P-DPO) as a solution to this limitation. Second, as a method to improve the online learning during the…

Enhanced beam transport via space charge mitigation in a multistage accelerator for fusion plasma diagnostics
M. Nishiura, K. Nakamura, K. Ueda, A. Shimizu, H. Takubo, M. Kanda, T. Ido, M. Okamura
https://arxiv.org/abs/2507.20948

Enhanced beam transport via space charge mitigation in a multistage accelerator for fusion plasma diagnostics
Efficient transport of high-current negative ion beams is critical for accurate plasma potential diagnostics using heavy-ion beam probe (HIBP) systems in magnetically confined fusion plasmas. However, strong space-charge effects often degrade transport efficiency, particularly for heavy ions such as Au-. In this study, we demonstrate a substantial improvement in beam transport by introducing an electrostatic lens effect through optimized voltage allocation in a multistage acceleration system. N…

Dislocation interaction with a tilt low angle grain boundary in bi-crystal SrTiO3
Kuan Ding, Atsutomo Nakamura, Patrick Cordier, Xufei Fang
https://arxiv.org/abs/2509.04893 http…

Dislocation interaction with a tilt low angle grain boundary in bi-crystal SrTiO3
For potentially wider applications of ceramics with dislocation-tuned mechanical and functional properties, it is pertinent to achieve dislocation engineering in polycrystalline ceramics. However, grain boundaries (GBs) in general are effective barriers for dislocation glide and often result in crack formation when plastic deformation in ceramics is attempted at room temperature. To develop strategies for crack suppression, it is critical to understand the fundamental processes for dislocation-…

Replaced article(s) found for physics.app-ph. https://arxiv.org/list/physics.app-ph/new
[1/1]:
- Trapped acoustic energy and resonances in spherical scatterers
Rodrigues, Alcar\'as, Bruno, Nakamura, Martinez

Trapping an Atomic Ion without Dedicated Digital-to-analog Converters
Ryutaro Ohira, Masanari Miyamoto, Shinichi Morisaka, Ippei Nakamura, Atsushi Noguchi, Utako Tanaka, Takefumi Miyoshi
https://arxiv.org/abs/2508.04093

Trapping an Atomic Ion without Dedicated Digital-to-analog Converters
Independent control of numerous electrodes in quantum charge-coupled device architectures presents a significant challenge for wiring and hardware scalability. To address this issue, we demonstrate a voltage control method based on time-division multiplexing (TDM). This approach utilizes a single high-update-rate digital-to-analog converter (DAC) to sequentially generate control signals for multiple electrodes, thereby reducing both the number of required DACs and associated wiring. We experime…

Magneto-optical Kerr-effect measurements under pulsed magnetic fields over 40 T using a compact sample fixture
Atsutoshi Ikeda, Sota Nakamura, Soichiro Yamane, Kosuke Noda, Akihiko Ikeda, Shingo Yonezawa
https://arxiv.org/abs/2509.07383

Magneto-optical Kerr-effect measurements under pulsed magnetic fields over 40 T using a compact sample fixture
Magnetic field is one of the most fundamental control parameters in materials science. Pulsed magnetic-field apparatus can generate high magnetic fields that are inaccessible by conventional DC-field magnets. One important issue is that measurement techniques compatible with pulsed fields are rather limited due to short pulse duration and large electromagnetic or mechanical noises originating from field pulses. Magneto-optical Kerr effect (MOKE), change in states of light polarization upon refl…

Randomization and ambiguity perception
Yutaro Akita, Kensei Nakamura
https://arxiv.org/abs/2509.05076 https://arxiv.org/pdf/2509.05076

Randomization and ambiguity perception
We provide a model of preferences over lotteries of acts in which a decision maker behaves as if optimally filtering her ambiguity perception. She has a set of plausible ambiguity perceptions and a cost function over them, and chooses multiple priors to maximize the minimum expected utility minus the cost. We characterize the model by axioms on attitude toward randomization and its timing, uniquely identify the filtering cost from observable data, and conduct several comparatives. Our model can…

Subspace-Protected Topological Phases and Bulk-Boundary Correspondence
Kenji Shimomura, Ryo Takami, Daichi Nakamura, Masatoshi Sato
https://arxiv.org/abs/2508.20908 https://

Subspace-Protected Topological Phases and Bulk-Boundary Correspondence
While tremendous research has revealed that symmetry enriches topological phases of matter, more general principles that protect topological phases have yet to be explored. In this Letter, we elucidate the roles of subspaces in free-fermionic topological phases. A subspace property for Hamiltonians enables us to define new topological invariants. They result in peculiar topological boundary phenomena, i.e., the emergence of an unpaired zero mode or zero-winding skin modes, characterizing subspa…

Establishment of global phase coherence in a highly disordered fractal MgO/MgB2 nanocomposite: Roles of interface, morphology and defect
Iku Nakaaki, Aoi Hashimoto, Shun Kondo, Yuichi Ikuhara, Shuuichi Ooi, Minoru Tachiki, Shunichi Arisawa, Akiko Nakamura, Taku Moronaga, Jun Chen, Hiroyo Segawa, Takahiro Sakurai, Hitoshi Ohta, Takashi Uchino
https://…

Establishment of global phase coherence in a highly disordered fractal MgO/MgB2 nanocomposite: Roles of interface, morphology and defect
Recently, we have reported that a highly disordered fractal MgO/MgB2 nanocomposite exhibits bulk-like superconducting properties with isotropic pinning, showing an excellent phase-coherent capability irrespective of the low volume fraction (~30 vol. %) of MgB2 [Uchino et al., Phys. Rev. B 101, 035146 (2020); Teramachi et al,, Phys. Rev. B 108, 155146 (2023)]. Hence, this nanocomposite provides a useful experimental system to investigate the relationship between the structural disorder and the e…

Replaced article(s) found for stat.AP. https://arxiv.org/list/stat.AP/new
[1/1]:
- Causal Representation Learning with Generative Artificial Intelligence: Application to Texts as T...
Kosuke Imai, Kentaro Nakamura

IdolSongsJp Corpus: A Multi-Singer Song Corpus in the Style of Japanese Idol Groups
Hitoshi Suda, Junya Koguchi, Shunsuke Yoshida, Tomohiko Nakamura, Satoru Fukayama, Jun Ogata
https://arxiv.org/abs/2507.01349

IdolSongsJp Corpus: A Multi-Singer Song Corpus in the Style of Japanese Idol Groups
Japanese idol groups, comprising performers known as "idols," are an indispensable part of Japanese pop culture. They frequently appear in live concerts and television programs, entertaining audiences with their singing and dancing. Similar to other J-pop songs, idol group music covers a wide range of styles, with various types of chord progressions and instrumental arrangements. These tracks often feature numerous instruments and employ complex mastering techniques, resulting in high signal lo…

Control of Covalent Bond Enables Efficient Magnetic Cooling
Xin Tang, Yoshio Miura, Noriki Terada, Enda Xiao, Shintaro Kobayashi, Allan Doring, Terumasa Tadano, Andres Martin-Cid, Takuo Ohkochi, Shogo Kawaguchi, Yoshitaka Matsushita, Tadakatsu Ohkubo, Tetsuya Nakamura, Konstantin Skokov, Oliver Gutfleisch, Kazuhiro Hono, Hossein Sepehri-Amin
https://

Control of Covalent Bond Enables Efficient Magnetic Cooling
Magnetic cooling, harnessing the temperature change in matter when exposed to a magnetic field, presents an energy-efficient and climate-friendly alternative to traditional vapor-compression refrigeration systems, with a significantly lower global warming potential. The advancement of this technology would be accelerated if irreversible losses arising from hysteresis in magnetocaloric materials were minimized. Despite extensive efforts to manipulate crystal lattice constants at the unit-cell le…

On the convergence of the no-response test for the heat equation
Shiwei Sun, Gen Nakamura, Haibing Wang
https://arxiv.org/abs/2506.23948 https://

On the convergence of the no-response test for the heat equation
Domain sampling methods called the range test (RT) and no-response test (NRT), and their duality are known for several inverse scattering problems and an inverse boundary value problem for the Laplace operator (see Section 1 for more details). In our previous work [21], we established the duality between the NRT and RT, and demonstrated the convergence of the RT for the heat equation. We also provided numerical studies for both methods. However, we did not address the convergence for the NRT. A…

Jet Collimation Profile of Low-Luminosity AGN M84: Insight into the Jet Formation in the Low Accretion Regime
Elika Prameswari Fariyanto, Kazuhiro Hada, Yuzhu Cui, Mareki Honma, Masanori Nakamura, Keiichi Asada, Xuezheng Wang, Wu Jiang
https://arxiv.org/abs/2507.21241

Jet Collimation Profile of Low-Luminosity AGN M84: Insight into the Jet Formation in the Low Accretion Regime
Recent advancements in high-resolution Very Long Baseline Interferometry (VLBI) have significantly improved our understanding of jet collimation near supermassive black holes in active galactic nuclei (AGNs), particularly in high-power systems. However, the collimation properties of jets in low-luminosity AGNs (LLAGNs) remain poorly explored. In this study, we investigate the jet structure of M84, a nearby radio galaxy and a representative LLAGN, to probe jet collimation properties in a low-acc…

Quantum phase estimation based filtering: performance analysis and application to low-energy spectral calculation
Rei Sakuma, Kaito Wada, Shu Kanno, Kimberlee Keithley, Kenji Sugisaki, Takashi Abe, Hajime Nakamura, Naoki Yamamoto
https://arxiv.org/abs/2507.01361

Quantum phase estimation based filtering: performance analysis and application to low-energy spectral calculation
Filtering is an important technique in quantum computing used for isolating or enhancing some specific states of quantum many-body systems. In this paper, we analyze the performance of filters based on the quantum phase estimation (QPE) algorithm, in which filtering removes states associated with bitstrings in the ancilla register above a given threshold. We show that when the conventional rectangular window function is used for the QPE input state, the resulting filter function exhibits an osc…

Hyperbolic Embeddings for Order-Aware Classification of Audio Effect Chains
Aogu Wada, Tomohiko Nakamura, Hiroshi Saruwatari
https://arxiv.org/abs/2507.20624 https://

Hyperbolic Embeddings for Order-Aware Classification of Audio Effect Chains
Audio effects (AFXs) are essential tools in music production, frequently applied in chains to shape timbre and dynamics. The order of AFXs in a chain plays a crucial role in determining the final sound, particularly when non-linear (e.g., distortion) or time-variant (e.g., chorus) processors are involved. Despite its importance, most AFX-related studies have primarily focused on estimating effect types and their parameters from a wet signal. To address this gap, we formulate AFX chain recogniti…

Quasiparticle interaction originating from Bogoliubov Fermi Surfaces under pressure in 18%-S substituted FeSe studied via NMR
Zhongyu Yu, Xiaoling Shen, Koya Nakamura, Kazuya Inomata, Kohei Matsuura, Yuta Mizukami, Shigeru Kasahara, Yuji Matsuda, Takasada Shibauchi, Yoshiya Uwatoko, Naoki Fujiwara
https://arxiv.org/abs/2507.20139

Quasiparticle interaction originating from Bogoliubov Fermi Surfaces under pressure in 18%-S substituted FeSe studied via NMR
S-substituted FeSe superconductors in the tetragonal phase display several unique features among iron-based superconductors, particularly the presence of zero-energy excitations in the superconducting (SC) state.The recent concept of Bogoliubov Fermi Surfaces (BFSs), a theoretical model describing ultranodal states, has attracted considerable interest. Nuclear magnetic resonance (NMR) studies on FeSe$_{1-x}$S$_x$ (x=0.18) have revealed an anomalous low-energy spin fluctuations deep in the SC st…

Replaced article(s) found for cond-mat.mes-hall. https://arxiv.org/list/cond-mat.mes-hall/new
[1/1]:
- Non-Hermitian Origin of Detachable Boundary States in Topological Insulators
Daichi Nakamura, Ken Shiozaki, Kenji Shimomura, Masatoshi Sato, Kohei Kawabata

High-Throughput Mapping of Magnetic Properties via the on-the-fly XMCD spectroscopy in a Combinatorial Fe-Co-Ni Film
Y. Yamasaki, N. Sasabe, Y. Ishii, Y. Sekiguchi, A. Sumiyoshiya, Y. Tanimoto, Y. Kotani, T. Nakamura, H. Nomura
https://arxiv.org/abs/2506.20958

High-Throughput Mapping of Magnetic Properties via the on-the-fly XMCD spectroscopy in a Combinatorial Fe-Co-Ni Film
High-throughput X-ray magnetic circular dichroism (XMCD) spectroscopy was conducted on Fe-Co-Ni compositionally graded films to systematically analyze the variation of magnetic properties as a function of composition. On-the-fly XMCD measurement enabled rapid spectral acquisition. Measurement time was reduced approximately tenfold compared to conventional stepwise methods, while maintaining high precision. The obtained XMCD spectra were processed using the Savitzky-Golay denoising technique, an…

Versatile multi-q antiferromagnetic charge order in correlated vdW metals
Y. Fujisawa, P. Wu, R. Okuma, B. R. M. Smith, D. Ueta, R. Kobayashi, N. Maekawa, T. Nakamura, C-H. Hsu, Chandan De, N. Tomoda, T. Higashihara, K. Morishita, T. Kato, Z. Y. Wang, Y. Okada
https://arxiv.org/abs/2507.00750

Versatile multi-q antiferromagnetic charge order in correlated vdW metals
Following the discovery of graphene, interest in van der Waals (vdW) materials has surged; yet, advancing "beyond graphene" physics requires the development of quantum material platforms that host versatile many-body states. Using scanning tunneling microscopy and spectroscopy at 300 mK, we uncover two competing states in vdW metal CeTe3: charge-ordered in-plane antiferromagnetic phases forming stripe and checkerboard patterns. Remarkably, the competition between them is tuned through a modest …

Magneto-cubic and magneto-linear dependence observed in an in-plane anomalous Hall magnet
Ayano Nakamura, Shinichi Nishihaya, Mitsuru Akaki, Motoi Kimata, Kenta Sudo, Yuki Deguchi, Hsiang Lee, Tadashi Yoneda, Masaki Kondo, Hiroaki Ishizuka, Masashi Tokunaga, Masaki Uchida
https://arxiv.org/abs/2507.21458

Magneto-cubic and magneto-linear dependence observed in an in-plane anomalous Hall magnet
The Hall effect, particularly that arising from in-plane magnetic field, has recently emerged as a sensitive probe of quantum geometric properties in solids. Especially in trigonal systems, in-plane anomalous Hall effect (AHE) can be explicitly induced by nontrivial off-diagonal coupling between the magnetic field and the Hall vector on the principal plane. Here we elucidate multipolar dependence of the off-diagonal coupling in the in-plane AHE, by systematically measuring on the (001) principa…

From weakly interacting spinons to tightly bound triplons in the frustrated quantum spin-Peierls chain
Pyeongjae Park, Bo Xiao, Karolina G\'ornicka, Andrew F. May, Jiaqiang Yan, Ryoichi Kajimoto, Mitsutaka Nakamura, Matthew B. Stone, G\'abor B. Hal\'asz, Andrew D. Christianson
https://arxiv.org/abs/2507.19412

From weakly interacting spinons to tightly bound triplons in the frustrated quantum spin-Peierls chain
Fractionalized quasiparticles and their confinement into emergent bound states lie at the heart of modern quantum magnetism. While the evolution into magnonic bound states has been well characterized, experimental insight into the analogous transition to triplons remains limited. Here, using high-resolution neutron spectroscopy and state-of-the-art spin dynamics simulations, we uncover the transformation from weakly interacting spinons to tightly bound triplons in the spin-Peierls compound CuGe…