Tootfinder

Weekend #Plankton Factoid 🦠🦐
Mating by copepods is a complicated process since they are always at risk of predation by other plankton or fishes. Male #copepods carefully mechanically and chemically track a receptive female, capture them, and deposit an adhesive spermatophore near the genital open…

Fifty Years of CAK
Jorick S. Vink (Armagh Observatory,Planetarium)
https://arxiv.org/abs/2506.06421 https://arxiv.org/pdf/2506.06421

Fifty Years of CAK
We present a new framework for massive star evolution that is no longer driven by Dutch or other mass-loss rate Recipes, but which take the physics of Gamma or L/M dependent mass loss consistently into account. We first discuss the hot-star mass-loss kink and the transition mass loss rate between optically thin and thick winds, before discussing vertical stellar evolution, mass evaporation, and the maximum black hole (BH) mass. We end with a suggestion that a recently uncovered red supergiant (…

Kink Dynamics in a Non-Autonomous Sine-Gordon Model
Tomasz Dobrowolski, Jacek Gatlik, Zofia Bry{\l}owska, Panayotis G. Kevrekidis
https://arxiv.org/abs/2506.03055

Kink Dynamics in a Non-Autonomous Sine-Gordon Model
The sine-Gordon model with space- and time-dependent parameters is considered. A highly accurate effective model with two degrees of freedom is constructed, allowing the description of the kink movement in this model even for extremely long times and nontrivial trajectories of the coherent structure. As a stringent test of the reduced order model, the case of a temporal drive leading to extremely complex kink motion is studied. The two-degree-of-freedom approximation is found to faithfully repr…

Confining kinks. $\zeta$-regularized one-loop kink mass shifts in exotic field theories
Luis Inzunza, Juan Mateos Guilarte, Pablo Pais
https://arxiv.org/abs/2506.20440

Confining kinks. $ζ$-regularized one-loop kink mass shifts in exotic field theories
By combining stability analysis of scalar field theories with the Darboux transformation technique, we create models featuring kink-like solutions whose quantum perturbations are all bounded. On the one hand, the stability analysis relates scalar theories with Schrödinger equations, whose solutions serve as quantum perturbation modes. On the other hand, the Darboux transformation allows for constructing new exotic but solvable Schrödinger equations. This framework relates the quantum harmonic…

Happy Pride! Everyone deserves dignity and respect at every stage of their life - including end of life. Help your loved ones and community celebrate you properly and appropriately by doing all your advance planning now -just think of how hard you'll party when it's done 🎉🌈
Got questions? I'm here to help and I am an ally and safe space for everyone in the LGBTIQA community and the kink community.

Identification and Inference of Partial Effects in Sharp Regression Kink Designs
Zhixin Wang, Zhengyu Zhang
https://arxiv.org/abs/2506.11663 https://

Identification and Inference of Partial Effects in Sharp Regression Kink Designs
The partial effect refers to the impact of a change in a target variable D on the distribution of an outcome variable Y . This study examines the identification and inference of a wide range of partial effects at the threshold in the sharp regression kink (RK) design under general policy interventions. We establish a unifying framework for conducting inference on the effect of an infinitesimal change in D on smooth functionals of the distribution of Y, particularly when D is endogenous and inst…

Movable Dirac Points with Ferroelectrics: Kink States and Berry Curvature Dipoles
Konstantin S. Denisov, Yuntian Liu, Igor \v{Z}uti\'c
https://arxiv.org/abs/2506.13960

Movable Dirac Points with Ferroelectrics: Kink States and Berry Curvature Dipoles
Two-dimensional (2D) Dirac states and Dirac points with linear dispersion are the hallmark of graphene, topological insulators, semimetals, and superconductors. Lowering a symmetry by the ferroelectric polarization opens the gap in Dirac points and introduces finite Berry curvature. Combining this with Dirac points detached from high symmetry points of the Brillouin zone offers additional ways to tailor topological properties. We explore this concept by studying topological phenomena emerging i…

Classical string profile for a class of DDF amplitudes
Diptarka Das, Santanu Mandal, Anurag Sarkar
https://arxiv.org/abs/2506.23974 https://

Classical string profile for a class of DDF amplitudes
In the critical bosonic string theory, we explicitly evaluate the three point scattering amplitude at tree level, of a photon with two massive higher spins. The massive excitations belong to states of the form $A_{-r_1}^{s_1} A_{-r_2}^{s_2}$ where $A_{-n}$ is a DDF creation operator. Next, we take the infinite ``spin'' limit to arrive at the classical string dynamics. We find a rotating ``floppy'' string lying mostly on a plane which develops a transverse kink.