Tootfinder

Scaling the memory wall using mixed-precision -- HPG-MxP on an exascale machine
Aditya Kashi, Nicholson Koukpaizan, Hao Lu, Michael Matheson, Sarp Oral, Feiyi Wang
https://arxiv.org/abs/2507.11512

Scaling the memory wall using mixed-precision -- HPG-MxP on an exascale machine
Mixed-precision algorithms have been proposed as a way for scientific computing to benefit from some of the gains seen for artificial intelligence (AI) on recent high performance computing (HPC) platforms. A few applications dominated by dense matrix operations have seen substantial speedups by utilizing low precision formats such as FP16. However, a majority of scientific simulation applications are memory bandwidth limited. Beyond preliminary studies, the practical gain from using mixed-preci…

Down But Not Out: The Case of Long-Period Comet C/2021 O3 (Panstarrs)
David Jewitt. Jing Li, Michael Jaeger, Yoonyoung Kim
https://arxiv.org/abs/2506.09263

Down But Not Out: The Case of Long-Period Comet C/2021 O3 (Panstarrs)
We combine ground- and space-based observations of long-period comet C/2021 O3 (Panstarrs) (perihelion distance 0.287 au) in order to investigate its reported near-perihelion destruction. Pre-perihelion photometric observations show a remarkably small heliocentric dependence of the scattered light, $\propto r_H^{-s}$ with $s = 2.59\pm0.21$, distinct from values reported in other long-period comets, for which $s$ = 4 is the canonical standard. The index is smaller than expected of coma productio…

The Emergence of Abstract Thought in Large Language Models Beyond Any Language
Yuxin Chen, Yiran Zhao, Yang Zhang, An Zhang, Kenji Kawaguchi, Shafiq Joty, Junnan Li, Tat-Seng Chua, Michael Qizhe Shieh, Wenxuan Zhang
https://arxiv.org/abs/2506.09890

The Emergence of Abstract Thought in Large Language Models Beyond Any Language
As large language models (LLMs) continue to advance, their capacity to function effectively across a diverse range of languages has shown marked improvement. Preliminary studies observe that the hidden activations of LLMs often resemble English, even when responding to non-English prompts. This has led to the widespread assumption that LLMs may "think" in English. However, more recent results showing strong multilingual performance, even surpassing English performance on specific tasks in other…

Considerations on Everett J. Nelson's connexive logic
Davide Fazio, Raffaele Mascella
https://arxiv.org/abs/2506.10893 https://ar…

Considerations on Everett J. Nelson's connexive logic
This work explores Everett John Nelson's connexive logic, outlined in his PhD thesis and partially summarized in his 1930 paper \emph{Intensional Relations}, which is obtained by extending the system $\mathsf{NL}$ (reconstructed by E. Mares and F. Paoli) with a weak conjunction elimination rule explicitly assumed in the former but not in the latter. After a preliminary analysis of Nelson's philosophical ideas, we provide an algebraic-relational semantics for his logic and we investigate possibl…

"#Menschenwürde ist kein Konjunktiv.
#Hoffnung ist ein Muskel.
Nazis raus aus den Parlamenten – Nazis raus aus den Talkshows – zurück in die Geschichtsbücher!"
–#EnnoBunger

Discovery and Localization of the Swift-Observed FRB 20241228A in a Star-forming Host Galaxy
Alice P. Curtin, Shion Andrew, Sunil Simha, Alice Cai, Kenzie Nimmo, Shami Chatterjee, Amanda M. Cook, Fengqiu Adam Dong, Yuxin Dong, Tarraneh Eftekhari, Wen-fai Fong, Emmanuel Fonseca, Jason W. T. Hessels, Ronniy C. Joseph, Victoria Kaspi, Calvin Leung, Robert Main, Kiyoshi W. Masui, Ryan Mckinven, Daniele Michilli, Mason Ng, Ayush Pandhi, Aaron B. Pearlman, Ziggy Pleunis, Mawson W. Sammons, K…

Discovery and Localization of the Swift-Observed FRB 20241228A in a Star-forming Host Galaxy
On 2024 December 28, CHIME/FRB detected the thus-far non-repeating FRB 20241228A with a real-time signal-to-noise ratio of $>50$. Approximately 112~s later, the X-ray Telescope onboard the Neil Gehrels Swift Observatory was on source, the fastest follow-up to-date of a non-repeating FRB (Tohuvavohu et al. in prep.). Using CHIME/FRB and two of the three CHIME/FRB Outriggers, we obtained a Very Long Baseline Interferometry localization for FRB 20241228A with a 1$σ$ confidence ellipse of 11$^{\pr…

Quantitative multi-metabolite imaging of Parkinson's disease using AI boosted molecular MRI
Hagar Shmuely (School of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel), Michal Rivlin (School of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel), Or Perlman (School of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel, Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel)

Quantitative multi-metabolite imaging of Parkinson's disease using AI boosted molecular MRI
Traditional approaches for molecular imaging of Parkinson's disease (PD) in vivo require radioactive isotopes, lengthy scan times, or deliver only low spatial resolution. Recent advances in saturation transfer-based PD magnetic resonance imaging (MRI) have provided biochemical insights, although the image contrast is semi-quantitative and nonspecific. Here, we combined a rapid molecular MRI acquisition paradigm with deep learning based reconstruction for multi-metabolite quantification of gluta…

A portrait throughout perihelion of the NH$_2$-rich interstellar comet 2I/Borisov
Sophie E. Deam, Michele T. Bannister, Cyrielle Opitom, Matthew M. Knight, Ryan Ridden-Harper, Darryl Z. Seligman, Alan Fitzsimmons, Aur\'elie Guilbert-Lepoutre, Emmanuel Jehin, Laurent Jorda, Michael Marsset, Youssef Moulane, Philippe Rousselot, Pierre Vernazza, Bin Yang

A portrait throughout perihelion of the NH$_2$-rich interstellar comet 2I/Borisov
The interstellar comet 2I/Borisov is the first interstellar object where compositional characterisation was possible throughout its entire perihelion passage. We report all 16 epochs of a comprehensive optical observation campaign with ESO VLT's integral field spectrograph MUSE, spanning 126 days from 2019 November 14 to 2020 March 19. The spatial dust emission of 2I/Borisov was predominantly smooth, with no seasonal effect. A jet-like feature was consistently visible. The gas production morpho…

Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS
Darryl Z. Seligman, Marco Micheli, Davide Farnocchia, Larry Denneau, John W. Noonan, Toni Santana-Ros, Luca Conversi, Maxime Devog\`ele, Laura Faggioli, Adina D. Feinstein, Marco Fenucci, Tessa Frincke, Olivier R. Hainaut, Willem B. Hoogendam, Henry H. Hsieh, Theodore Kareta, Michael S. P. Kelley, Tim Lister, Du\v{s}an Mar\v{c}eta, Karen J. Meech, Francisco Oca\~na, Eloy Pe\~na-Asensio, Benjamin J. Shap…

Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS
We report initial observations aimed at the characterization of a third interstellar object candidate. This object, 3I/ATLAS -- also C/2025 N1 (ATLAS) -- , was discovered on 2025 July 1 UT and has an orbital eccentricity of $e\sim6.2$, perihelion of $q\sim 1.35$ au, inclination of $\sim175^\circ$, and hyperbolic velocity of $V_\infty\sim 60$ km s$^{-1}$. 3I/ATLAS has an absolute magnitude of $H_V\sim12$, which corresponds to a nuclear radius of $\sim10\text{ km}$, assuming an asteroid-like albe…

Searching for Historical Extragalactic Optical Transients Associated with Fast Radio Bursts
Y. Dong (Northwestern/CIERA), C. D. Kilpatrick, W. Fong, A. P. Curtin, S. Opoku, B. C. Andersen, A. M. Cook, T. Eftekhari, E. Fonseca, B. M. Gaensler, R. C. Joseph, J. F. Kaczmarek, L. A. Kahinga, V. Kaspi, A. E. Lanman, M. Lazda, C. Leung, K. W. Masui, D. Michilli, K. Nimmo, A. Pandhi, A. B. Pearlman, M. Sammons, P. Scholz, V. Shah, K. Shin, K. Smith

Searching for Historical Extragalactic Optical Transients Associated with Fast Radio Bursts
We present a systematic search for past supernovae (SNe) and other historical optical transients at the positions of fast radio burst (FRB) sources to test FRB progenitor systems. Our sample comprises 83 FRBs detected by the Canadian Hydrogen Intensity Mapping Experiment (CHIME) and its KKO Outrigger, along with 93 literature FRBs representing all known well-localized FRBs. We search for optical transients coincident in position and redshift with FRBs and find no significant associations within…