Tootfinder

Rolling into Friday like...
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X-Shooting ULLYSES: Massive stars at low metallicity. XIII. Putting the bi-stability jump to the test in the LMC
T. Alkousa (Astrophysics Research Cluster, School of Mathematical and Physical Sciences, University of Sheffield), P. A. Crowther (Astrophysics Research Cluster, School of Mathematical and Physical Sciences, University of Sheffield), J. M. Bestenlehner (Astrophysics Research Cluster, School of Mathematical and Physical Sciences, University of Sheffield, School of Chemical, M…

X-Shooting ULLYSES: Massive stars at low metallicity. XIII. Putting the bi-stability jump to the test in the LMC
We aim to investigate the theoretical bi-stability jump, which predicts an increase in mass-loss rates below 21 kK. We further aim to constrain the photospheric and wind parameters of a sample of 16 LMC late-O and B supergiants. We utilise the 1D, non-LTE radiative transfer model CMFGEN in a grid-based approach and subsequent fine-tuned spectroscopic fitting procedure to determine the stellar and wind parameters of each star. We apply this method to ultra-violet data from the ULLYSES programme …

On the new BC Ferries being built in China.
Do we all remember the last time the BC NDP went down the road of “building a shipbuilding industry to build ferries”?
It has its own Wiki, of course.
"In addition to major delays and cost overruns, the ferries never fully met their original specifications, and only operated briefly in a reduced capacity, before being auctioned off at a substantial loss by the subsequently elected BC Liberal Party government.”
No, I'm not thrilled that China, an authoritarian state, is going to be building these ferries. But no BC or Canadian firms bid on the contract. And right now, the expertise in ship building is in China and Europe (the Island and Salish class vessels were built in Europe).
I don't blame the NDP for not repeating the same mistake 30 years later.
And the ferries will still be refit and maintained for their full service life within BC.
#BCPoli #BCNDP #FastFerry #Shipbuilding.
https://en.wikipedia.org/wiki/Fast_ferry_scandal

On gluing and splitting series invariants of plumbed 3-manifolds
Allison H. Moore, Nicola Tarasca
https://arxiv.org/abs/2506.06515 https://

On gluing and splitting series invariants of plumbed 3-manifolds
We study series invariants for plumbed 3-manifolds and knot complements twisted by a root lattice. Our series recover recent results of Gukov-Pei-Putrov-Vafa, Gukov-Manolescu, Park, and Ri and apply more generally to 3-manifolds which are not necessarily negative definite. We show that our series verify certain gluing and splitting properties related to the corresponding operations on 3-manifolds. We conclude with an explicit description of the case of lens spaces and Brieskorn spheres.

This https://arxiv.org/abs/2405.08485 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Doubly relaxed forward-Douglas--Rachford splitting for the sum of two nonconvex and a DC function
In this paper, we consider a class of structured nonconvex nonsmooth optimization problems whose objective function is the sum of three nonconvex functions, one of which is expressed in a difference-of-convex (DC) form. This problem class covers several important structures in the literature including the sum of three functions and the general DC program. We propose a splitting algorithm and prove the subsequential convergence to a stationary point of the problem. The full sequential convergenc…

This https://arxiv.org/abs/2505.00968 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csLG_…

Tree-Sliced Wasserstein Distance with Nonlinear Projection
Tree-Sliced methods have recently emerged as an alternative to the traditional Sliced Wasserstein (SW) distance, replacing one-dimensional lines with tree-based metric spaces and incorporating a splitting mechanism for projecting measures. This approach enhances the ability to capture the topological structures of integration domains in Sliced Optimal Transport while maintaining low computational costs. Building on this foundation, we propose a novel nonlinear projectional framework for the Tre…

Sharp estimates of quantum covering problems via a novel trace inequality
Hao-Chung Cheng, Li Gao, Christoph Hirche, Hao-Wei Huang, Po-Chieh Liu
https://arxiv.org/abs/2507.07961

Sharp estimates of quantum covering problems via a novel trace inequality
In this paper, we prove a novel trace inequality involving two operators. As applications, we sharpen the one-shot achievability bound on the relative entropy error in a wealth of quantum covering-type problems, such as soft covering, privacy amplification, convex splitting, quantum information decoupling, and quantum channel simulation by removing some dimension-dependent factors. Moreover, the established one-shot bounds extend to infinite-dimensional separable Hilbert spaces as well. The pro…

Removal of spallation-induced tritium from silicon through diffusion
R. Saldanha, D. Reading, P. E. Warwick, A. E. Chavarria, B. Loer, P. Mitra, L. Pagani, P. Privitera
https://arxiv.org/abs/2506.06568

Removal of spallation-induced tritium from silicon through diffusion
Tritium, predominantly produced through spallation reactions caused by cosmic ray interactions, is a significant radioactive background for silicon-based rare event detection experiments, such as dark matter searches. We have investigated the feasibility of removing cosmogenic tritium from high-purity silicon intended for use in low-background experiments. We demonstrate that significant tritium removal is possible through diffusion by subjecting silicon to high-temperature (> 400C) baking. Usi…

Fast Coherent Splitting of Bose-Einstein Condensates
Yevhenii Kuriatnikov, Nikolaus W\"urkner, Karthikeyan Kumaran, Tiantian Zhang, M. Venkat Ramana, Andreas Kugi, J\"org Schmiedmayer, Andreas Deutschmann-Olek, Maximilian Pr\"ufer
https://arxiv.org/abs/2507.06799

Fast Coherent Splitting of Bose-Einstein Condensates
Preparation of non-trivial quantum states without introducing unwanted excitations or decoherence remains a central challenge in utilizing ultracold atomic systems for quantum simulation. We employ optimal control methods to realize fast, coherent splitting of a one-dimensional Bose-Einstein condensate, achieving minimal classical excitations while preserving quantum correlations. Furthermore, we explore two-step protocols in which controlled classical motion is first induced and subsequently s…

An inexact inertial projective splitting algorithm with strong convergence
M. Marques Alves, J. E. Navarro Caballero, R. T. Marcavillaca
https://arxiv.org/abs/2507.05382

An inexact inertial projective splitting algorithm with strong convergence
We propose and study a strongly convergent inexact inertial projective splitting (PS) algorithm for finding zeros of composite monotone inclusion problems involving the sum of finitely many maximal monotone operators. Strong convergence of the iterates is ensured by projections onto the intersection of appropriately defined half-spaces, even in the absence of inertial effects. We also establish iteration-complexity results for the proposed PS method, which likewise hold without requiring inerti…