Tootfinder

Ukraine receives $500 million in IMF funding, maintaining growth forecasts: https://benborges.xyz/2025/07/01/ukraine-receives-million-in-imf.html

A New Spectral Class of Brown Dwarfs at the Bottom of the IMF in IC 348
K. L. Luhman, C. Alves de Oliveira
https://arxiv.org/abs/2506.08969 https://…

A New Spectral Class of Brown Dwarfs at the Bottom of the IMF in IC 348
In a previous study, we used JWST to identify three new brown dwarfs in the center of a nearby star-forming cluster, IC 348. The faintest object had an estimated mass of 3-4 $M_{\rm Jup}$, making it a contender for the least massive brown dwarf confirmed with spectroscopy. Two of the new brown dwarfs also exhibited absorption features from an unidentified aliphatic hydrocarbon, which were not predicted by atmospheric models and were not previously detected in atmospheres outside of the solar sy…

If I chant "Death to the IMF", it doesn't mean I want to kill all bankers!
Maybe I do, maybe I don't, but that statement doesn't resolve it.
😆

Impact of initial mass function on the chemical evolution of high-redshift galaxies
Boyuan Liu, Michela Mapelli, Volker Bromm, Ralf S. Klessen, Lumen Boco, Tilman Hartwig, Simon C. O. Glover, Veronika Lipatova, Guglielmo Costa, Marco Dall'Amico, Giuliano Iorio, Kendall Shepherd, Alessandro Bressan
https://arxiv.org/abs/2506.…

Impact of initial mass function on the chemical evolution of high-redshift galaxies
Star formation and metal enrichment in galaxies are regulated by supernova (SN) explosions and metal yields from massive stars, which are sensitive to the high-mass end of the initial mass function (IMF). Recent JWST observations have reached a consensus on an invariant relation between stellar mass, metallicity, and star formation rate up to $z\sim 8$ and its breakdown at higher redshifts. It is crucial to understand the underlying physics, especially the role played by the IMF. We explore the…

Njoki Njoroge Njehû
Principal Political Advisor – Movement Building, Pan-African Fight Inequality Alliance.
Begins with a series of Qs on personal experience of poverty/wealth.
Live in Age of Multiple Crises fed by global capitalism. No accidents: deliberate policies from IMF/WB, extraction, sacrifice of communities, over-consumption: by design peoples pushed back. It's systemic, driving inequality and climate collapse.
Those responsible have names.

The Initial Mass Function of Stars and Brown Dwarfs in the Upper Sco Association
K. L. Luhman
https://arxiv.org/abs/2505.21747 https://

The Initial Mass Function of Stars and Brown Dwarfs in the Upper Sco Association
I present infrared spectroscopy of 37 brown dwarf candidates in the Upper Sco association, 35 of which are classified as young and cool, making them likely members. This sample includes many of the faintest spectroscopically confirmed members ($K=16$-17 mag), which should have masses down to $\sim0.007$-0.01 $M_\odot$ for the range of ages in Upper Sco (7-14 Myr). Using my updated membership catalog for Upper Sco, I have estimated the initial mass function (IMF) for a field in the center of the…

Schr\"odinger Bridge Matching for Tree-Structured Costs and Entropic Wasserstein Barycentres
Samuel Howard, Peter Potaptchik, George Deligiannidis
https://arxiv.org/abs/2506.17197

Schrödinger Bridge Matching for Tree-Structured Costs and Entropic Wasserstein Barycentres
Recent advances in flow-based generative modelling have provided scalable methods for computing the Schrödinger Bridge (SB) between distributions, a dynamic form of entropy-regularised Optimal Transport (OT) for the quadratic cost. The successful Iterative Markovian Fitting (IMF) procedure solves the SB problem via sequential bridge-matching steps, presenting an elegant and practical approach with many favourable properties over the more traditional Iterative Proportional Fitting (IPF) procedu…

Learning to Regulate: A New Event-Level Dataset of Capital Control Measures
Geyue Sun, Xiao Liu, Tomas Williams, Roberto Samaniego
https://arxiv.org/abs/2505.23025

Learning to Regulate: A New Event-Level Dataset of Capital Control Measures
We construct a novel event-level Capital Control Measures (CCM) dataset covering 196 countries from 1999 to 2023 by leveraging prompt-based large language models (LLMs). The dataset enables event study analysis and cross-country comparisons based on rich policy attributes, including action type, intensity, direction, implementing entity, and other multidimensional characteristics. Using a two-step prompt framework with GPT-4.1, we extract structured information from the IMF's Annual Report on E…

Variations of the Near-Surface Electric field measured at Aragats during Geomagnetic Storms
A. Chilingarian
https://arxiv.org/abs/2505.16271 https://

Variations of the Near-Surface Electric field measured at Aragats during Geomagnetic Storms
At least two mechanisms effectively transfer interplanetary magnetic field (IMF) disturbances into the atmosphere. First, the inflow of solar wind into the ionosphere at low latitudes significantly enhances the total vertical electron content, increasing atmospheric conductivity. Second, Forbush decreases (FD) reduce the cosmic ray flux by a few percent, lowering ionization levels at middle latitudes and decreasing conductivity. Changes in atmospheric conductivity affect the global electric cir…