Tootfinder

Delayed transitions, promoted states and multistability in a pressure-driven nematic under an electric field
G. McKay, N. J. Mottram
https://arxiv.org/abs/2508.14826 https://

Delayed transitions, promoted states and multistability in a pressure-driven nematic under an electric field
We consider the effects of an applied pressure gradient on the classical Freedericksz transition, finding a delayed transition, the promotion of particular director configurations and even pressure-induced multistability. Using the theoretical framework developed by Ericksen and Leslie, we find that the applied pressure gradient adapts the normal pitchfork bifurcation at critical applied voltage, leading to both a delayed bifurcation to higher voltages and a transformation from a supercritical …

Near-resonant nuclear spin detection with megahertz mechanical resonators
Diego A. Visani, Letizia Catalini, Christian L. Degen, Alexander Eichler, Javier del Pino
https://arxiv.org/abs/2508.14754

Near-resonant nuclear spin detection with megahertz mechanical resonators
Mechanical resonators operating in the megahertz range have become a versatile platform for fundamental and applied quantum research. Their exceptional properties, such as low mass and high quality factor, make them also appealing for force sensing experiments. In this work, we propose a method for detecting, and ultimately controlling, nuclear spins by coupling them to megahertz resonators via a magnetic field gradient. Dynamical backaction between the sensor and an ensemble of $N$ nuclear spi…

‘Extremely disturbing and unethical’: new rules allow VA doctors to refuse to treat Democrats, unmarried veterans | Trump administration | The Guardian https://www.theguardian.com/us-news/2025/jun/16/va-doctors-refuse-treat-patients

Musk and Trump are enemies made for each other - united in their ability to trash their own brands (Jonathan Freedland/The Guardian)
https://www.theguardian.com/commentisfree/2025/jun/06/donald-trump-elon-musk-enemies-trash-twitter-tesla
http://www.memeorandum.com/250607/p1#a250607p1

Sub-supersolutions method for singular quasilinear systems involving gradient terms
Abdelkrim Moussaoui
https://arxiv.org/abs/2508.06359 https://arxiv.org/…

Sub-supersolutions method for singular quasilinear systems involving gradient terms
Existence, regularity and location of solutions to quasilinear singular elliptic systems with general gradient dependence are established developing a method of sub-supersolution. The abstract theorems involving sub-supersolutions are applied to prove the existence of positive solutions for convective and absorption singular systems.

A comprehensive Darcy-type law for viscoplastic fluids: I. Framework
Emad Chaparian
https://arxiv.org/abs/2506.06184 https://arxiv.or…

A comprehensive Darcy-type law for viscoplastic fluids: I. Framework
A comprehensive Darcy-type law for viscoplastic fluids is proposed. Different regimes of yield-stress fluid flow in porous media can be categorised based on the Bingham number (i.e. the ratio of the yield stress to the characteristic viscous stress). In a recent study (Chaparian, J. Fluid Mech., vol. 980, A14, 2024), we addressed the yield/plastic limit (infinitely large Bingham number), namely, the onset of percolation when the applied pressure gradient is just sufficient to overcome the yield…

Characterization of the Cherenkov Photon Background for Low-Noise Silicon Detectors in Space
Manuel E. Gaido, Javier Tiffenberg, Alex Drlica-Wagner, Guillermo Fernandez-Moroni, Bernard J. Rauscher, Fernando Chierchie, Dario Rodrigues, Lucas Giardino, Juan Estrada, Agustin J. Lapi
https://arxiv.org/abs/2507.00226

Characterization of the Cherenkov Photon Background for Low-Noise Silicon Detectors in Space
Future space observatories that seek to perform imaging and spectroscopy of faint astronomical sources will require ultra-low-noise detectors that are sensitive over a broad wavelength range. Silicon charge-coupled devices (CCDs), such as EMCCDs, skipper CCDs, multi-amplifier sensing (MAS) CCDs, and single-electron sensitive read out (SiSeRO) CCDs have demonstrated the ability to detect and measure single photons from X-ray energies to near the silicon band gap (~1.1 $μ$m), making them candida…

Experimental Multiport-Network Parameter Estimation and Optimization for Multi-Bit RIS
Philipp del Hougne
https://arxiv.org/abs/2507.02168 https://

Experimental Multiport-Network Parameter Estimation and Optimization for Multi-Bit RIS
Physics-consistent theoretical studies on RIS-parametrized wireless channels use models from multiport-network theory (MNT) to capture mutual-coupling (MC) effects. However, in practice, RIS design and radio environment are partially or completely unknown. We fill a research gap on how to estimate the MNT model parameters in such experimentally relevant scenarios. Our technique efficiently combines closed-form and gradient-descent steps, and it can be applied to multi-bit-programmable RIS eleme…

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