@Techmeme@techhub.social2026-05-20 06:35:55
An analysis based on current valuations of OpenAI and Anthropic suggests ~$370B of philanthropic assets tied to the two AI companies are poised to become liquid (Nan Ransohoff/Nan's Substack)
https://nanransohoff.substack.com/p/the-third-wave-of-american-phila…
@sakhavi@aoir.social2026-06-23 02:26:17
Do I wish we needed a subtler framework than “Superloser” to analyze our current “great power” leaders? Yes. Do I think “Superloser” just about covers it, though? Also yes.
https://snyder.substack.com/p/the-era-of-the-superlosers
@arXiv_astrophGA_bot@mastoxiv.page2026-07-22 08:12:01
Physical Properties of 6.7 Million Galaxies from the DESI Bright Galaxy Survey: Spectral Fitting and Systematic Tests with Mock Spectra
Niu Li, Hu Zou, Jinfu Gou, Weijian Guo, Wenxiong L, Haoming Song, Jipeng Sui, Xi Tan, Yunao Xiao, Jingyi Zhang
https://arxiv.org/abs/2607.19162 https://arxiv.org/pdf/2607.19162 https://arxiv.org/html/2607.19162
arXiv:2607.19162v1 Announce Type: new
Abstract: We present a comprehensive analysis of the physical properties of galaxies in the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) Bright Galaxy Survey (BGS), based on full spectral fitting of $\sim 6.7$ million galaxy spectra. Using a customized spectral fitting pipeline, we derive key physical parameters including stellar mass, stellar velocity dispersion, stellar population age, dust attenuation, and emission-line properties. To quantify the reliability and systematic uncertainties of our measurements, we construct a large set of mock spectra that closely reproduce the observed properties of DESI data, including realistic noise and spectral features. By comparing the recovered parameters with the known inputs, we assess the performance of the spectral fitting as a function of stellar continuum signal-to-noise ratio (S/N, defined as the ratio of the median continuum flux to its associated error) and redshift. We find that stellar masses can be robustly recovered with negligible bias for spectra with $\mathrm{S/N} \gtrsim 5$, while low-S/N spectra ($\mathrm{S/N} \lesssim 5$) show a mild systematic overestimation of $\sim 0.1$ dex and increased scatter. Similar trends are observed for stellar population parameters, while emission-line fluxes are recovered with high accuracy and minimal bias. We further validate our stellar mass estimates by comparison with independent measurements from photometric spectral energy distribution fitting, finding good overall consistency within the expected systematic uncertainties. The value-added catalog presented in this work enables a wide range of statistical studies of galaxy evolution with DESI, and provides a foundation for future analyses.
toXiv_bot_toot
@cdarwin@c.im2026-07-21 01:26:26
US Immigration and Customs Enforcement (ICE) has engaged in a deadly immigration crackdown that has trampled the constitutional rights of migrants and US citizens.
During the operation, there have been 28 incidents where immigration agents shot at people,
resulting in eight deaths,
according to an analysis by The Trace.
On July 13, an ICE officer fatally shot Joan Sebastian Duršn Guerrero,
a 25-year-old delivery driver from Colombia authorized to work in the US…
@anneroth@systemli.social2026-07-19 19:10:52
Vor 25 Jahren war in #Genua eine spektakulär großartige, riesige internationale Demo zuende gegangen, Thema waren Migration und offene Grenzen, Anlass der G8-Gipfel.
Wir ahnten, dass der nächste Tag anders werden würde, aber wir ahnten nicht, was dann kam.
@Dragofix@veganism.social2026-06-17 20:38:50
Millions of homes in London, Essex and Kent at risk of sinking as climate crisis worsens https://www.theguardian.com/environment/2026/jun/11/millions-homes-london-essex-and-kent-sinking-climate-crisis-subsidence
@Techmeme@techhub.social2026-07-19 06:01:26
Analysis: OpenAI and Anthropic employees are donating to campaigns more heavily and cohesively than Google, Meta, and Airbnb employees did post-IPO (Alexandra Lindsay/The San Francisco Standard)
https://sfstandard.com/2026/07/18/ai-s-…
@ErikJonker@mastodon.social2026-06-17 20:31:45
@arXiv_physicsaoph_bot@mastoxiv.page2026-05-22 08:16:20
Water vapor buoyancy and the African easterly jet
Heng Quan, Da Yang, William Boos, Tiffany Shaw, Huazhi Ge, Yaoxuan Zeng, Carly KleinStern
https://arxiv.org/abs/2605.21875 https://arxiv.org/pdf/2605.21875 https://arxiv.org/html/2605.21875
arXiv:2605.21875v1 Announce Type: new
Abstract: The African easterly jet (AEJ) is a prominent circulation feature in the tropical atmosphere. It transports mineral dust and generates easterly waves that serve as seeds for hurricanes. Conventional wisdom holds that the AEJ is in thermal wind balance with the positive meridional temperature gradient over North Africa. Here, using reanalysis data, we show that the negative meridional moisture gradient substantially counteracts the effect of the temperature gradient on density in that balance, diagnostically accounting for a 30\% reduction of the AEJ magnitude. Using CMIP6 data, we further show that this effect of vapor buoyancy on the AEJ strengthens under global warming, highlighting the critical role of the spatial distribution of moisture on large-scale circulation. Analysis of the AEJ in CMIP6 models confirms that some models do not include vapor buoyancy in their governing equations, raising questions about the relevance of their projections of climate change in that region.
toXiv_bot_toot
@Techmeme@techhub.social2026-07-20 08:11:04
Trial lawyers, with big liability litigation earnings, are among the most active lobbyists against autonomous vehicles, even as data shows clear safety benefits (Alex Tabarrok/Marginal Revolution)
https://marginalrevolution.com/margina
