Tootfinder

Cryogenic spin 3/2 nuclear quadrupole resonance: Spin relaxation and electric field gradient via Rabi frequency goniometry
Ritik R. Modi (Department of Physics and Astronomy, George Mason University, Fairfax, VA, USA), Karen L. Sauer (Department of Physics and Astronomy, George Mason University, Fairfax, VA, USA, Quantum Science and Engineering Center, George Mason University, Fairfax, VA, USA)

Cryogenic spin 3/2 nuclear quadrupole resonance: Spin relaxation and electric field gradient via Rabi frequency goniometry
A straightforward way to determine the electric field gradient $-$ principal axes frame (EFG-PAF) on single crystal samples with spin 3/2 nuclei is demonstrated. Nuclear quadrupole resonance (NQR) spectroscopy is used to determine the Rabi frequency for $^{35}$Cl in a single crystal of potassium chlorate (KClO$_3$) by comparing the NQR signal for powder and single crystal samples. By exploiting the geometrical dependence of the Rabi frequency with respect to the excitation direction, EFG-PAF is…

reading more about the energia rockets at https://russianspaceweb.com

Hawking Radiation Signatures from Primordial Black Holes Transiting the Inner Solar System: Prospects for Detection
Alexandra P. Klipfel, Peter Fisher, David I. Kaiser
https://arxiv.org/abs/2506.14041

Hawking Radiation Signatures from Primordial Black Holes Transiting the Inner Solar System: Prospects for Detection
Primordial black holes (PBHs) arise from the collapse of density perturbations in the early universe and serve as a dark matter (DM) candidate and a probe of fundamental physics. There remains an unconstrained ``asteroid-mass'' window where PBHs of masses $10^{17} {\rm g} \lesssim M \lesssim 10^{23} {\rm g}$ could comprise up to $100\%$ of the dark matter. Current $e^{\pm}$ Hawking radiation constraints on the DM fraction of PBHs are set by comparing observed spatial- and time-integrated cosmic…

Population III star formation near high-redshift active galactic nuclei
Ethan M. Fisk, Madeline A. Marshall, Phoebe R. Upton Sanderbeck, Jarrett L. Johnson
https://arxiv.org/abs/2508.10986

Population III star formation near high-redshift active galactic nuclei
Using cosmological radiation-hydrodynamical simulations, we study the effect of accreting supermassive black holes (SMBHs) on nearby dark-matter (DM) haloes in the very early universe. We find that an SMBH with a spectral energy distribution (SED) extending from the near-ultraviolet to hard X-rays, can produce a radiation background sufficient to delay gravitational collapse in surrounding DM haloes until up to $10^7$ M$_\odot$ of zero-metallicity gas is available for the formation of Populatio…

HPR3D: Hierarchical Proxy Representation for High-Fidelity 3D Reconstruction and Controllable Editing
Tielong Wang, Yuxuan Xiong, Jinfan Liu, Zhifan Zhang, Ye Chen, Yue Shi, Bingbing Ni
https://arxiv.org/abs/2507.11971

HPR3D: Hierarchical Proxy Representation for High-Fidelity 3D Reconstruction and Controllable Editing
Current 3D representations like meshes, voxels, point clouds, and NeRF-based neural implicit fields exhibit significant limitations: they are often task-specific, lacking universal applicability across reconstruction, generation, editing, and driving. While meshes offer high precision, their dense vertex data complicates editing; NeRFs deliver excellent rendering but suffer from structural ambiguity, hindering animation and manipulation; all representations inherently struggle with the trade-of…

Last Sunday, while sipping my morning brew, an impulsive light bulb went off in my head. It said, "You will ride a bike in Denmark; you will ride to three nearby cities."
I am not a sporty guy whatsoever, but it sounds fun… on paper.
I am unprepared to ride 150 km in a few days, and I expect to die 500 times an hour.
#coffee

Charged Particle Oscillations around a Black Hole Surrounded by CDM Halos
Zakaria Ahal, Hasan El Moumni, Karima Masmar
https://arxiv.org/abs/2507.11139 htt…

Charged Particle Oscillations around a Black Hole Surrounded by CDM Halos
HF QPOs are among the most intriguing phenomena observed in LMXBs containing BHs or neutron stars. In this work, we investigate charged particles' dynamics in the nearby of a Schwarzschild-like BH embedded in a uniform magnetic field and surrounded on all sides by CDM. Thereby gaining deeper insight into the influence of magnetic and DM distributions on observable phenomena near compact objects. We first present a modified metric, which incorporates the effects of a CDM ... We compute the fun…

🧑🏾‍⚕️ Primary care shortage affects 44% of Virginia's neighborhoods, almost 3.8 million residents, study finds
https://medicalxpress.com/news/2025-07-primary-shortage-affects-virginia-neighborhoods.html

Primary care shortage affects 44% of Virginia's neighborhoods, almost 3.8 million residents, study finds
Nearly half of Virginia's neighborhoods don't have enough nearby primary care physicians for their residents, with rural communities being hit hardest by workforce shortages, according to a new study led by researchers at Virginia Commonwealth University.

Forgotten treasures in the HST/FOC UV imaging polarimetric archives of active galactic nuclei -- IV. 5 Orphaned AGNs
Thibault Barnouin (Observatoire Astronomique de Strasbourg, Universit\'e de Strasbourg, France), Fr\'ed\'eric Marin (Observatoire Astronomique de Strasbourg, Universit\'e de Strasbourg, France), Enrique Lopez-Rodriguez (Department of Physics and Astronomy, University of South Carolina, USA, Kavli Institute for Particle Astrophysics and Cosmology, Stanford…

Forgotten treasures in the HST/FOC UV imaging polarimetric archives of active galactic nuclei -- IV. 5 Orphaned AGNs
The Faint Object Camera (FOC) onboard the Hubble Space Telescope (HST) acquired high-resolution, spatially resolved polarimetric images of nearby Active Galactic Nuclei (AGNs) in the near ultraviolet (near-UV) band. Among the 25 individual targets in the polarized archives, 8 had no published analysis until the beginning of this series of papers. We tackle the last 5 targets in the following. In this paper, we finalize the publication of near-UV imaging polarimetry of AGNs in the HST/FOC archiv…