Tootfinder

There seem to be constant reminders of the disastrous mistakes that led up to the most catastrophic American foreign policy decision in recent memory -- the war on Iraq.
Despite the costly lessons of the past and the flashing warning signs before us today,
Trump seems poised to press the button on joining Israel’s attack on Iran.
Doing so could be an even bigger mistake.
The echoes are numerous:
A complete disregard for international law and diplomatic alternativ…

Can the United States Really Be Marching Toward This Madness Again?
The eerie echoes of Iraq and 2003 are numerous. But there are some key differences—and they make going into Iran an even greater act of folly.

The spectra of $bc\bar{b}\bar{c}$ tetraquark states from a diquark-antidiquark perspective
Zhen-Yang Wang, Jing-Juan Qi, Zhen-Hua Zhang, Xin-Heng Guo
https://arxiv.org/abs/2508.12366

The spectra of $bc\bar{b}\bar{c}$ tetraquark states from a diquark-antidiquark perspective
Within the diquark-antidiquark framework, this study investigates the masses of ground-state tetraquarks composed of heavy charm ($c$) and bottom ($b$) quarks and antiquarks, using the Bethe-Salpeter formalism. We establish the Bethe-Salpeter equations for the fully heavy $bc\bar{b}\bar{c}$ tetraquarks to the leading order in $1/m_Q$ expansion. These equations are subsequently solved numerically under the covariant instantaneous approximation with kernels containing scalar confinement and one-g…

Advanced Langevin thermostats: Properties, extensions to rheology, and a lean momentum-conserving approach
Shubham Agarwal, Sergey V. Sukhomlinov, Marc Honecker, Martin H. M\"user
https://arxiv.org/abs/2506.15579

Advanced Langevin thermostats: Properties, extensions to rheology, and a lean momentum-conserving approach
The Langevin equation accounts for unresolved bath degrees of freedom driving the system toward the bath temperature. Because of this, numerical solutions of the Langevin equation have a long history. Here, we recapitulate, combine, and extend existing Langevin-equation based thermostats, scrutinize their properties and demonstrate their superiority over global kinetic-energy controls. Our work includes compact, asymptotic-analysis based derivations of stochastic thermostats, including the high…

Modeling wind farm noise emission and propagation: effects of flow layout
J. Colas, A. Emmanuelli, D. Dragna, R. J. A. M. Stevens
https://arxiv.org/abs/2508.13128 https://

Modeling wind farm noise emission and propagation: effects of flow layout
This study demonstrates how wind farm flow physics influence noise generation and downstream propagation through numerical simulations. The flow field is modeled using large-eddy simulations (LES), and the time-averaged output serves as input to acoustic models that predict wind turbine noise. In the first turbine row, turbulence-induced noise (TIN) and trailing edge noise (TEN) contribute equally, with TIN dominating at low frequencies and TEN at higher frequencies. Downstream, TEN decreases d…

Two-loop BSM contributions to Higgs pair production in the aligned THDM
Giuseppe Degrassi, Ramona Gr\"ober, Pietro Slavich
https://arxiv.org/abs/2508.11539 https://

Two-loop BSM contributions to Higgs pair production in the aligned THDM
We study the impact of the two-loop corrections controlled by the BSM Higgs couplings on the cross section for the production of a pair of SM-like Higgs bosons via gluon fusion in the aligned THDM. To this aim, we reassess the two-loop calculation of $λ_{hhh}$, we compute for the first time the two-loop corrections to $λ_{hhH}$, and we include the relevant corrections to the Higgs-gluon couplings and to the s-channel propagators entering the $gg \rightarrow hh$ amplitude. We discuss the numer…

Linear and Numerical SDoF Bounds of Active RIS-Assisted MIMO Wiretap Interference Channel
Su Linfan, Miao Yuhang, Song Yuxuan, Zheng Shuo, Zhang Tong, Xu Yinfei, Wang Shuai, Li Na
https://arxiv.org/abs/2506.15073

Linear and Numerical SDoF Bounds of Active RIS-Assisted MIMO Wiretap Interference Channel
The multiple-input multiple-output (MIMO) wiretap interference channel (IC) serves as a canonical model for information-theoretic security, where a multiple-antenna eavesdropper attempts to intercept communications in a two-user MIMO IC system. The secure degrees-of-freedom (SDoF) of an active reconfigurable intelligent surface (RIS)-assisted MIMO wiretap IC is with practical interests but remains unexplored. In this paper, we establish both sum-SDoF lower and upper bounds through linear beamfo…

Pulsar Sparking: What if mountains on the surface?
Zi-Hao Xu, Wei-Yang Wang, Ren-Xin Xu
https://arxiv.org/abs/2506.12305 https://arxi…

Pulsar Sparking: What if mountains on the surface?
A numerical framework to calculate the height and potential of the vacuum inner gap is proposed here. The results show that small mountains on a pulsar's polar cap tend to significantly influence the properties of the inner vacuum gap, making it easier for sparks to form. In this scenario, the magnetospheric activity observed from the pulsars PSR J0250$+$5854 and PSR J2144$-$3933, which lie below the pulsar death line, would be reproduced, and the irregular discharge behaviour in other polar ca…

Inertia Tames Fluctuations in Autonomous Stationary Heat Engines
Enrique P. Cital, Viktor Holubec
https://arxiv.org/abs/2508.12936 https://arxiv.org/pdf/25…

Inertia Tames Fluctuations in Autonomous Stationary Heat Engines
Thermodynamic uncertainty relations (TURs) provide fundamental constraints on the interplay between power fluctuations, entropy production, and efficiency in overdamped stationary autonomous heat engines. However, their validity in underdamped regimes remains limited and less explored. Here, we analytically and numerically study a physically realizable autonomous heat engine composed of two underdamped continuous degrees of freedom coupled to a two-level system. We show that this nonlinear setu…

Lyapunov analysis for FISTA under strong convexity
Luis M. Brice\~no-Arias
https://arxiv.org/abs/2506.11785 https://arxiv.org/pdf/250…

Lyapunov analysis for FISTA under strong convexity
In this paper, we conduct a theoretical and numerical study of the Fast Iterative Shrinkage-Thresholding Algorithm (FISTA) under strong convexity assumptions. We propose an autonomous Lyapunov function that reflects the strong convexity of the objective function, whether it arises from the smooth or non-smooth component. This Lyapunov function decreases monotonically at a linear rate along the iterations of the algorithm for a fixed inertial parameter. Our analysis demonstrates that the best th…

A continuous-time model to interpolate between speed and function value restart in accelerated first order methods
Juan Jos\'e Maul\'en, Huiyuan Guo, Juan Peypouquet
https://arxiv.org/abs/2506.11267

A continuous-time model to interpolate between speed and function value restart in accelerated first order methods
We introduce a new restarting scheme for a continuous inertial dynamics with Hessian driven-damping, and establish a linear convergence rate for the function values along the restarted trajectories. The proposed routine is a generalization of existing speed restart schemes, and interpolates between speed and function value restarts, considerably delaying the restarting time, while preserving the function value decrease. Numerical experiments show an improvement in the convergence rates for both…