Tootfinder

Detecting and characterising the magnetic field of exoplanets
A. Strugarek, S. V. Berdyugina, V. Bourrier, J. A. Caballero, J. J. Chebly, R. Fares, A. Fludra, L. Fossati, A. Garc\'ia Mu\~noz, L. Gkouvelis, C. Gourv\`es, J. L. Grenfell, R. D. Kavanagh, K. G. Kislyakova, L. Lamy, A. F. Lanza, C. Moutou, D. Nandy, C. Neiner, A. Oklop\v{c}i\'c, A. Paul, V. R\'eville, D. Rodgers-Lee, E. L. Shkolnik, J. D. Turner, A. A. Vidotto, F. Yang, P. Zarka

Detecting and characterising the magnetic field of exoplanets
Magnetic fields play a crucial role in planetary evolution and habitability. While the intrinsic magnetic fields of solar system planets are relatively well understood, the magnetic properties of exoplanets remain largely unconstrained, despite their potential ubiquity. Detecting exoplanetary magnetic fields is essential to advancing our understanding of planetary habitability beyond the solar system. This paper focuses on two promising spectropolarimetric techniques for detecting magnetic fiel…

Computational Modelling of Thixotropic Multiphase Fluids
Andres Santiago Espinosa-Moreno, Nicol\'as Moreno, Marco Ellero
https://arxiv.org/abs/2507.02766

Computational Modelling of Thixotropic Multiphase Fluids
Multiphase systems are ubiquitous in engineering, biology, and materials science, where understanding their complex interactions and rheological behavior is crucial for advancing applications ranging from emulsion stability to cellular phase separation. This study presents a numerical methodology for modeling thixotropic multiphase fluids, emphasizing the transient behavior of viscosity and the intricate interactions between phases. The model incorporates phase-dependent viscosities, interfacia…

Probing aqueous interfaces with spin defects
Alfonso Castillo, Gustavo R. Perez-Lemus, Mykyta Onizhuk, Giulia Galli
https://arxiv.org/abs/2507.01220 https:…

Probing aqueous interfaces with spin defects
Understanding the physical and chemical properties of aqueous interfaces is important in diverse fields of science, ranging from biology and chemistry to materials science. In spite of crucial progress in surface sensitive spectroscopic techniques over the past decades, the microscopic properties of aqueous interfaces remain difficult to measure. Here we explore the use of noise spectroscopy to characterize interfacial properties, specifically of quantum sensors hosted in two-dimensional materi…

This https://arxiv.org/abs/2502.18262 has been replaced.
initial toot: https://mastoxiv.page/@a…

Analytic approach to creating homogeneous fields with finite-size magnets
Homogeneous magnetic fields can be generated through the strategic arrangement of permanent magnets. The Halbach array serves as a prominent example of an effective design following this principle. However, it is a two-dimensional approach because it is optimal when placing infinitely long magnets -- line dipoles -- on a circle. If shorter, more realistic magnets are to be used, the optimal arrangement of magnetic moments diverges from the classical Halbach geometry. This paper presents optimal…

Covariant Lie Derivatives and (Super-)Gravity
Grigorios Giotopoulos
https://arxiv.org/abs/2507.00140 https://arxiv.org/pdf/2507.00140…

Covariant Lie Derivatives and (Super-)Gravity
The slightly subtle notion of covariant Lie derivatives of \textit{bundle-valued} differential forms is crucial in many applications in physics, notably in the computation of conserved currents in gauge theories, and yet the literature on the topic has remained fragmentary. This note provides a complete and concise mathematical account of covariant Lie derivatives on a spacetime (super-)manifold $M,$ defined via choices of lifts of spacetime vector fields to principal $G$-bundles over it, or eq…

A lot of people are going to say things like: “that's it, it was never really viable anyway. we should just have highways and walking paths”.
But not only is the statement completely false, that's the attitude that got us here. That's the attitude that has brought us climate change. And worst of all, that's the defeatist and nihilistic attitude that will lead to the burning of not just more forest, but whole communities, and eventually, the likely collapse of our civilization.
After the 2021 November floods there was never a question about whether the government would spend (never accounted for!) billions on repairing the highways immediately.
The CN and CP Railways also rebuilt theirs that were heavily damaged, and did it a lot faster, because railways are a lot easier to build, and rebuild, than 4 lane, or 2 lane highways.
During the 2023 wildfire on the other side of Cameron Lake, the railway sat unused while the highway was closed for weeks, leading to massive economic losses for #PortAlberni #tofino and #Ucluelet and all the Nuchanulth Territories and huge social disconnection.
So rebuild it? Absolutely!
Electrify it? Darn right!
Run Freight and Passenger on it again for the benefit of all Islanders!? OF COURSE! It should have never been allowed to stop its 100 years of service to us in the first place!
#PortAlberni #ClimateChange #ClimateCatastrophe #EndFossilFuels #BCWildfire #WesleyRidgeFire #Railway #Transporation #Electrification
https://socialbc.ca/@vibyrail/114960246953397309

Riemannian Time Warping: Multiple Sequence Alignment in Curved Spaces
Julian Richter, Christopher Erd\"os, Christian Scheurer, Jochen J. Steil, Niels Dehio
https://arxiv.org/abs/2506.01635

Riemannian Time Warping: Multiple Sequence Alignment in Curved Spaces
Temporal alignment of multiple signals through time warping is crucial in many fields, such as classification within speech recognition or robot motion learning. Almost all related works are limited to data in Euclidean space. Although an attempt was made in 2011 to adapt this concept to unit quaternions, a general extension to Riemannian manifolds remains absent. Given its importance for numerous applications in robotics and beyond, we introduce Riemannian Time Warping~(RTW). This novel approa…

A Stable and Theoretically Grounded Gromov-Wasserstein Distance for Reeb Graph Comparison using Persistence Images
Erin W. Chambers, Guangyu Meng
https://arxiv.org/abs/2507.01171 …

A Stable and Theoretically Grounded Gromov-Wasserstein Distance for Reeb Graph Comparison using Persistence Images
Reeb graphs are a fundamental structure for analyzing the topological and geometric properties of scalar fields. Comparing Reeb graphs is crucial for advancing research in this domain, yet existing metrics are often computationally prohibitive or fail to capture essential topological features effectively. In this paper, we explore the application of the Gromov-Wasserstein distance, a versatile metric for comparing metric measure spaces, to Reeb graphs. We propose a framework integrating a symme…

Spectropolarimetric synthesis of forbidden lines in MHD models of coronal bright points
Ernest Alsina Ballester, Daniel N\'obrega-Siverio, Fernando Moreno-Insertis, Supriya Hebbur Dayananda
https://arxiv.org/abs/2506.23884

Spectropolarimetric synthesis of forbidden lines in MHD models of coronal bright points
The inference of the magnetic field vector from spectropolarimetric observations is crucial for understanding the physical processes governing the solar corona. We investigate which information on the magnetic fields of coronal bright points (CBP) can be gained from the intensity and polarization of the Fe XIII 10747 A, Fe XIV 5303 A, Si X 14301 A, and Si IX 39343 A forbidden lines. We apply the P-CORONA synthesis code to a CBP model in the very low corona, obtained with the Bifrost code, and t…

Influence of oxygen-defects on intraband terahertz conductivity of carbon nanotubes
Maksim Paukov, Shuang Sun, Dmitry Krasnikov, Arina Radivon, Gennady Komandin, Andrey Vyshnevyy, Emil Chiglintsev, Stanislav Colar, Kirill Brekhov, Kirill Zaytsev, Sergei Garnov, Nadzeya Valynets, Albert Nasibulin, Aleksey Arsenin, Valentyn Volkov, Alexander Chernov, Yan Zhang, Maria Burdanova

Influence of oxygen-defects on intraband terahertz conductivity of carbon nanotubes
The exceptional charge transport properties of single-walled carbon nanotubes (SWCNTs) enable numerous ultrafast optoelectronic applications. Modifying SWCNTs by introducing defects significantly impacts the performance of nanotube-based devices, making defect characterization crucial. This research tracked these effects in oxygen plasma-treated SWCNT thin films. Sub-picosecond electric fields of varying strengths and additional photoexcitation were used to assess how defects influence charge c…