Tootfinder

The atomic gas properties of Green Pea galaxies: Connections to Lyman continuum leakage
Archishman Khasnovis (National Centre for Radio Astrophysics, India), Nissim Kanekar (National Centre for Radio Astrophysics, India), Sangeeta Malhotra (NASA Goddard Space Flight Center, USA), James Rhoads (NASA Goddard Space Flight Center, USA)
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The atomic gas properties of Green Pea galaxies: Connections to Lyman continuum leakage
We have used the Green Bank Telescope to search for H{\sc{i}} 21\,cm emission from 30 Green Pea galaxies (GPs) at $z\approx0.012-0.045$, obtaining 7 detections of H{\sc{i}} 21\,cm emission and 17 upper limits on the H{\sc{i}} mass. Including GPs from the literature, we obtain a sample of 60 GPs at $z<0.05$, with 19 detections and 41 non-detections of H{\sc{i}} 21\,cm emission, and with stellar masses in the range $10^6-10^9\,\rm{M_{\odot}}$. We use the line luminosity ratio O32~$\equiv$~[O{\sc …

A Multi-Level Monte Carlo Tree Search Method for Configuration Generation in Crystalline Systems
Xiaoxu Li, Ge Xu, Huajie Chen, Xingyu Gao, Haifeng Song
https://arxiv.org/abs/2507.02509

A Multi-Level Monte Carlo Tree Search Method for Configuration Generation in Crystalline Systems
In this paper, we study the construction of structural models for the description of substitutional defects in crystalline materials. Predicting and designing the atomic structures in such systems is highly challenging due to the combinatorial growth of atomic arrangements and the ruggedness of the associated landscape. We develop a multi-level Monte Carlo tree search algorithm to generate the "optimal" configuration within a supercell. Our method explores the configuration space with an expand…

In search of exotic pairing in the Hubbard model: many-body computation and quantum gas microscopy
Chunhan Feng, Thomas Hartke, Yuan-Yao He, Botond Oreg, Carter Turnbaugh, Ningyuan Jia, Martin Zwierlein, Shiwei Zhang
https://arxiv.org/abs/2509.02688

In search of exotic pairing in the Hubbard model: many-body computation and quantum gas microscopy
Pair density waves and exotic superconductivity have long been of strong interest, and have attracted much recent attention. We present a joint theoretical and experimental exploration of possible signatures of fermion pairing with finite center-of-mass momentum, or the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) order. Experimentally a doped and spin-imbalanced attractive two-dimensional Hubbard model is realized with a cold atomic gas in an optical lattice, and quantum gas microscopy is used to p…

Information encoding in spherical DFT
Sol Samuels, Chance M. Baxter, Susan R. Atlas
https://arxiv.org/abs/2507.00987 https://arxiv.or…

Information encoding in spherical DFT
Spherical density functional theory (DFT) [Theophilou, J. Chem. Phys. 149, 074104 (2018)] is a reformulation of the classic theorems of DFT, in which the role of the total density of a many-electron system is replaced by a set of sphericalized densities, constructed by spherically-averaging the total electron density about each atomic nucleus. In Hohenberg-Kohn DFT and its constrained-search generalization, the electron density suffices to reconstruct the spatial locations and atomic numbers of…

Atom-Searcher: Enhancing Agentic Deep Research via Fine-Grained Atomic Thought Reward
Yong Deng, Guoqing Wang, Zhenzhe Ying, Xiaofeng Wu, Jinzhen Lin, Wenwen Xiong, Yuqin Dai, Shuo Yang, Zhanwei Zhang, Qiwen Wang, Yang Qin, Changhua Meng
https://arxiv.org/abs/2508.12800

Atom-Searcher: Enhancing Agentic Deep Research via Fine-Grained Atomic Thought Reward
Large language models (LLMs) exhibit remarkable problem-solving abilities, but struggle with complex tasks due to static internal knowledge. Retrieval-Augmented Generation (RAG) enhances access to external information, yet remains limited in multi-hop reasoning and strategic search due to rigid workflows. Recent advancements in agentic deep research empower LLMs to autonomously reason, search, and synthesize information. However, current approaches relying on outcome-based reinforcement learnin…

Search for Light Dark Matter with 259-day data in PandaX-4T
Minzhen Zhang, Zihao Bo, Wei Chen, Xun Chen, Yunhua Chen, Chen Cheng, Xiangyi Cui, Manna Deng, Yingjie Fan, Deqing Fang, Xuanye Fu, Zhixing Gao, Yujie Ge, Lisheng Geng, Karl Giboni, Xunan Guo, Xuyuan Guo, Zichao Guo, Chencheng Han, Ke Han, Changda He, Jinrong He, Houqi Huang, Junting Huang, Yule Huang, Ruquan Hou, Xiangdong Ji, Yonglin Ju, Xiaorun Lan, Chenxiang Li, Jiafu Li, Mingchuan Li, Peiyuan Li, Shuaijie Li, Tao Li, Yang…

Search for Light Dark Matter with 259-day data in PandaX-4T
We present a search for light dark matter particles through their interactions with atomic electrons and nucleons, utilizing PandaX-4T data with an effective exposure of 1.04 tonne$\cdot$year for ionization-only data and 1.20 tonne$\cdot$year for paired data. Our analysis focuses on the energy range (efficiency$>$0.01) of approximately 0.33 to 3 keV for nuclear recoils, and from 0.04 to 0.39 keV for electronic recoils. We establish the most stringent constraints on spin-independent dark matter-…

Study of thorium in hypersonic gas jets: Ionization potentials of Th and Th$^ $
A. Claessens, F. Ivandikov, M. Brasseur, A. Dragoun, Ch. E. D\"ullmann, R. Ferrer, Yu. Kudryavtsev, P. Palmeri, P. Quinet, S. Raeder, D. Renisch, P. Van den Bergh, P. Van Duppen
https://arxiv.org/abs/2507.21946 https://arxiv.org/pdf/2507.21946 https://arxiv.org/html/2507.21946
arXiv:2507.21946v1 Announce Type: new
Abstract: Laser ionization spectroscopy was performed on both neutral and singly ionized $^{232}$Th with the aim of identifying the nuclear-clock isomer in the singly charged ionic state of $^{229}$Th. A search for an efficient laser ionization scheme of $^{232}$Th$^ $ was conducted in an argon-filled gas cell. This revealed a congested spectrum due to collisional quenching effects and the presence of several auto-ionizing states, one of which has a laser ionization efficiency of at least $1.2 \%$. Using a threshold approach, the second ionization potential was determined to be $12.300(9)\,$eV. The subsequent study on atomic $^{232}$Th validated the threshold approach. Conducting spectroscopy in a hypersonic gas jet, suppressed the gas-collision-induced quenching, revealing a Rydberg series that converges to the first ionization potential, determined to be $6.306879(14)\,$eV. The gas jet also cools down the thorium, allowing for high-resolution laser spectroscopy with a resolution of $240(30)\,$MHz. Using the Multiconfigurational Dirac-Hartree-Fock (MCDHF) method, the ionization potentials were computed, showing a relative difference of 0.06\% and 0.19\% between theory and our experimental values for the ionization potentials of Th and Th$^ $ respectively. Further calculations using a pseudo-relativistic Hartree-Fock method reveal strong mixing in the used intermediate state at $26113.27\,$cm$^{-1}$ of Th. A dedicated fast-extraction gas cell with $^{233}$U recoil sources was used to study $^{229}$Th$^ $ but no photo-ionization signal could be observed.
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MIGHTEE-HI: The direct detection of neutral hydrogen in galaxies at $z>0.25$
Matt J. Jarvis, Madalina N. Tudorache, I. Heywood, Anastasia A. Ponomareva, M. Baes, Natasha Maddox, Kristine Spekkens, Andreea Varasteanu, C. L. Hale, Mario G. Santos, R. G. Varadaraj, Elizabeth A. K. Adams, Alessandro Bianchetti, Barbara Catinella, Jacinta Delhaize, M. Maksymowicz-Maciata, Pavel E. Mancera Pi\~na, Hengxing Pan, Am\'elie Saintonge, Gauri Sharma, O. Ivy Wong

MIGHTEE-HI: The direct detection of neutral hydrogen in galaxies at $z>0.25$
Atomic hydrogen constitutes the gas reservoir from which molecular gas and star formation in galaxies emerges. However, the weakness of the line means it has been difficult to directly detect in all but the very local Universe. Here we present results from the first search using the MeerKAT International Tiered Extragalactic Exploration (MIGHTEE) Survey for high-redshift ($z>0.25$) H{\sc i} emission from individual galaxies. By searching for 21-cm emission centered on the position and redshift …