Tootfinder

IIb or not IIb: A Catalog of ZTF Kilonova Imposters
Tyler Barna, Christoffer Fremling, Tomas Ahumada, Igor Andreoni, Smaranika Banerjee, Joshua S. Bloom, Mattia Bulla, Tracy X. Chen, Michael W. Coughlin, Tim Dietrich, Xander J. Hall, Alexandra Junell, Ben Rusholme, Jesper Sollerman, Niharika Sravan
https://arxiv.org/abs/2506.159…

IIb or not IIb: A Catalog of ZTF Kilonova Imposters
Among the various classes of fast optical transients (FOTs), kilonovae (KNe), which can emerge as a result of neutron star mergers, are extremely challenging to observe because of not only the rapid timescale on which they fade (on the order of days), but also due to the relative scarcity of their occurrence. This scarcity is compounded by the large number of other FOTs that may initially resemble the characteristic rise of a KNe. While these objects can be ruled out as candidate KNe by taking …

Anti-Sisyphus driving in a matter-wave swing
Wen L. Liu, Jun Jian, Ning X. Zheng, Hui Tang, Ji Z. Wu, Yu Q. Li, Wen X. Zhang, Jie Ma, Suo T. Jia
https://arxiv.org/abs/2506.16019

Anti-Sisyphus driving in a matter-wave swing
Dilute-gas Bose-Einstein condensates are an exceptionally versatile testbed for the investigation of physics phenomenon especially the well-known classical system. Here we use a degenerate Bose gas of sodium atoms confined in an optical dipole trap to simulate the matter-wave on the swing. Under the driving of Anti-Sisyphus process, the swing was excited successfully. Moreover, the spin echo like behavior and collective-mode excitation appear during the oscillation of matter-wave swing, manifes…

Intelligent Automation for FDI Facilitation: Optimizing Tariff Exemption Processes with OCR And Large Language Models
Muhammad Sukri Bin Ramli
https://arxiv.org/abs/2506.12093

Intelligent Automation for FDI Facilitation: Optimizing Tariff Exemption Processes with OCR And Large Language Models
Tariff exemptions are fundamental to attracting Foreign Direct Investment (FDI) into the manufacturing sector, though the associated administrative processes present areas for optimization for both investing entities and the national tax authority. This paper proposes a conceptual framework to empower tax administration by leveraging a synergistic integration of Optical Character Recognition (OCR) and Large Language Model (LLM) technologies. The proposed system is designed to first utilize OCR …

All-optical control of antiferromagnetic domains via an inverse optical magnetoelectric effect
Shingo Toyoda, Vilmos Kocsis, Yusuke Tokunaga, Istv\'an K\'ezsm\'arki, Yasujiro Taguchi, Taka-hisa Arima, Yoshinori Tokura, Naoki Ogawa
https://arxiv.org/abs/2506.07051

All-optical control of antiferromagnetic domains via an inverse optical magnetoelectric effect
Antiferromagnets are a promising platform for next-generation spintronics due to their ultrafast spin dynamics and robustness to external fields. All-optical control of antiferromagnetic order is essential to fully exploit their potential in energy-efficient and high-speed spintronic and memory applications. However, optical writing of antiferromagnetic domains remains a fundamental challenge, as conventional magneto-optical techniques rely on net magnetization, which is absent in antiferromagn…

Continuing the series #Bochum, Germany, #sunset, from 11 June: long picture series - with #sunspots, identified in https://www.facebook.com/photo/?fbid=1120784560089937, and atmospheric optics ... and common swifts galore - in https://www.facebook.com/dan.fischer.393/posts/pfbid0m3ZmXb1CoX1JnekSsGCiAEELvkSHoFZMudTSU4YNQQv5h6MQibeRMGJydjaGhojTl

🇺🇦 Auf radioeins läuft...
Gorillaz feat. Bootie Brown:
🎵 Dirty Harry
#NowPlaying #Gorillaz #BootieBrown
https://open.spotify.com/track/5oPetiXxyczinXVQrhTIxQ

The optical constants and grain sizes of interstellar dust measured directly using the dust scattered x-ray halo of GRB 221009A
Albert Sneppen, Darach Watson
https://arxiv.org/abs/2506.12125

The optical constants and grain sizes of interstellar dust measured directly using the dust scattered x-ray halo of GRB 221009A
X-ray scattering is a powerful probe of the optical constants and grain size distribution of interstellar dust. Bright, transient sources are excellent tools for this, since they fade rapidly, leaving only the expanding scattered x-ray halo. Here, we analyse the dust-scattered x-ray halo data of the unprecedentedly bright $γ$-ray burst, GRB 221009A, using anomalous diffraction theory to measure the grain size distribution of dust in the Galaxy as well as the complex refractive index, $m$, and …

Quasi-Periodic Optical Key-Enabled Hybrid Cryptography: Merging Diffractive Physics and Deep Learning for High-Dimensional Security
Haiqi Gao, Yu Shao, Jiaming Liang, Xuehui Wang, Junren Wen, Yuchuan Shao, Yueguang Zhang, Weidong Shen, Chenying Yang
https://arxiv.org/abs/2505.23479

Quasi-Periodic Optical Key-Enabled Hybrid Cryptography: Merging Diffractive Physics and Deep Learning for High-Dimensional Security
Optical encryption inherently provides strong security advantages, with hybrid optoelectronic systems offering additional degrees of freedom by integrating optical and algorithmic domains. However, existing optical encryption schemes heavily rely on electronic computation, limiting overall efficiency, while the physical keys are susceptible to damage, compromising both security and system stability. To overcome these challenges, we introduce the Quasi Periodic Optical Key (QPOK), which combines…

Modeling the Optical Properties of Biological Structures using Symbolic Regression
Julian Sierra-Velez, Alexandre Vial, Marina Inchaussandague, Diana Skigin, Demetrio Mac\'ias
https://arxiv.org/abs/2506.01862

Modeling the Optical Properties of Biological Structures using Symbolic Regression
We present a Machine Learning approach based on Symbolic Regression to derive, from either numerically generated or experimentally measured spectral data, closed-form expressions that model the optical properties of biological materials. To evaluate the performance of our approach, we consider three case studies with the aim of retrieving the refractive index of the materials that constitute the biological structures considered. The results obtained show that, in addition to retrieving readable…

Optical Photometric Monitoring of the Blazar OT 355 and Local Standard Stars' Calibration
R. Bachev, Tushar Tripathi, Alok C. Gupta, A. Kurtenkov, Y. Nikolov, A. Strigachev, S. Boeva, G. Latev, B. Spassov, M. Minev, E. Ovcharov, W. -X. Yang, Yi Liu, J. -H. Fan
https://arxiv.org/abs/2505.23677…

Optical Photometric Monitoring of the Blazar OT 355 and Local Standard Stars' Calibration
OT 355 (4FGL J1734.3 + 3858) is a relatively rarely studied but highly variable, moderate-redshift (z = 0.975) flat-spectrum radio quasar (blazar). With this work, we aim to study its optical variability on different timescales, which can help us to better understand the physical processes in relativistic jets operating in blazar-type active galactic nuclei. OT 355 was observed in four colors (BVRI) during 41 nights between 2017 and 2023 using three 1 and 2 m class telescopes. The object was al…