Ronaldo V. Lobato

46 Followers
211 Following
218 Posts

Physicist, professor, research scientist at CBPF and GNU/Linux enthusiast / Paraense de Igarapé-Miri, físico, professor, pesquisador do CBPF e entusiasta GNU/Linux / Il segreto della vita è questa non è un'esercitazione.

• Working with #gravitation, modified #gravity, compact #stars, nuclear #physics, machine #learning, data #science

#OpenScience, #linux, #FOSS, #Decentralization, #DistributedSystems, #GNU advocate

• CC BY-NC-SA

Mastodonhttps://mastodon.social/@rvlobato
Websitehttps://www.rvlobato.com
PoliticsFreedom
Keyoxidehttps://keyoxide.org/0EDF0C53F7399B5F254EB3F94B3854817E8BF5C5

The Python Software Foundation shows more spine than every single tech giant in just one single decision.

> Diversity, equity, and inclusion are core to the PSF’s values

https://pyfound.blogspot.com/2025/10/NSF-funding-statement.html

The PSF has withdrawn a $1.5 million proposal to US government grant program

In January 2025, the PSF submitted a proposal to the US government National Science Foundation under the Safety, Security, and Privacy of Op...

👋 Hello! GNU Guix is on @hachyderm - yay!

If you haven't heard of #gnu #guix we're a free software project that's created a hosted package manager (think homebrew or flatpak) and a GNU/Linux distribution.

GNU Guix uses the functional packaging approach pioneered by #nix and adds a user-experience and system configuration system. It uses a DSL that's based on Guile Scheme. You can use it configure your home environment, dev environments or the entire system using a declarative and transactional definition.

We hope to tell people about the project and our latest news. We'd love to engage with people around #freesoftware #guile #scheme and more general #linux topics!

F-Droid and Google's Developer Registration Decree

https://f-droid.org/en/2025/09/29/google-developer-registration-decree.html

"If you own a computer, you should have the right to run whatever programs you want on it. This is just as true with the apps on your Android/iPhone mobile device as it is with the applications on your Linux/Mac/Windows desktop or server. Forcing software creators into a centralized registration scheme in order to publish and distribute their works is as egregious as forcing writers and artists to register with a central authority in order to be able to distribute their creative works. It is an offense to the core principles of free speech and thought that are central to the workings of democratic societies around the world."

#opensource #android #fdroid #freedom

F-Droid and Google's Developer Registration Decree | F-Droid - Free and Open Source Android App Repository

For the past 15 years, F-Droid has provided a safe and secure haven for Android users around the world to find and install free and open source apps. When co...

I enjoyed flipping through Havlevi et al.'s recent paper on arXiv, "A Black Hole is Born", and being reminded that everything about core-collapse supernovae is mind-bogglingly extreme:

https://arxiv.org/abs/2506.20837

As an example, the accretion rates onto the central object (initially a neutron star that collapses into a black hole) are measured in *solar masses per second*.

#astronomy #Astrodon

A Black Hole is Born: 3D GRMHD Simulation of Black Hole Formation from Core-Collapse

We present the first three-dimensional, fully general-relativistic magnetohydrodynamic (3D GRMHD) simulation of a black hole (BH) formed from the collapsed core of a massive star. The ability to self-consistently capture the birth of a compact remnant in 3D is crucial for modeling natal BH properties (including masses, spins, and kicks), which are of particular interest in the era of gravitational wave astronomy. However, such simulations have remained elusive due to extreme computational challenges and demands. We employ the GPU-accelerated dynamical-spacetime GRMHD code GRaM-X to follow the collapse, core-bounce, shock propagation, and eventual BH formation of a massive stellar progenitor in full 3D. We initialize our simulation by mapping a one-dimensional (1D) model of a star with a zero-age-main-sequence mass of $45 M_\odot$ to 3D. We use moderate rotation (consistent with expectations from stellar evolution modeling) and a relatively weak dipolar magnetic field. The collapsing core drives a shock that reaches a maximum radius of roughly 170 km before stalling and does not lead to a successful explosion. The proto-neutron star accretes matter before collapsing to form a BH $t_{BH} \approx 325$ ms after core-bounce. The time of BH formation and initial BH mass are remarkably similar to those obtained with GR1D, a 1D general-relativistic neutrino-hydrodynamics code, to which we compare our results. We track the horizon of the newborn BH after formation and calculate a steady kick velocity of $v_{kick} \approx 72$ km/s and a mass of $M_{BH} \approx 2.62 M_\odot$, which is still rising at the end of the simulation.

arXiv.org

It's official, GNOME Calendar and the Orca screen reader together agree about the trouble we find ourselves in with climate change: "Weather collapsed."

#GNOMECalendar #Orca #accessibility #a11y #climatechange #collapse #permacomputing #Linux #Piper #texttospeech #GNOME #weather

The current administration in the US has, through various funding agencies such as the NSF and NIH, has recently suspended virtually all federal grants to my home university, UCLA (including my own personal grant, although that is far from the most serious impact of this decision), on the grounds that UCLA was “failing to promote a research environment free of antisemitism and bias”. One can certainly debate whether these grounds were justified, or whether they merit the extremely draconian damage to the very research environment that this decision is claiming to protect, but if nothing else this unprecedented decision does not appear to have followed the usual standards of due process for actions of this nature; for instance, there appears to have been no good faith effort by the administration to receive a response from UCLA to its allegations before implementing its decision.

The suspension of my personal grant has a non-trivial impact on myself (in particular, my summer salary, which I had already deferred in order to allow the previously released NSF funds to support several of my graduate students over this period, is now in limbo), and now gives me almost no resources to support my graduate students going forward; but this is only a fraction of a percent of the entire amount being suspended. A far greater concern is the impact on the Institute for Pure and Applied Mathematics (IPAM) https://www.ipam.ucla.edu/, which despite receiving preliminary approval earlier this year for a new five-year round of funding (albeit at significantly reduced levels) from the NSF, now only has enough emergency funding for a few months of further operation at best if the suspension is not lifted. (1/4)

Look, speaking as a physicist, it is hard for me to put into words how batshit crazy this is.

https://gizmodo.com/billionaires-convince-themselves-ai-is-close-to-making-new-scientific-discoveries-2000629060

Billionaires Convince Themselves AI Chatbots Are Close to Making New Scientific Discoveries

"I'm doing the equivalent of vibe coding, except it's vibe physics."

Gizmodo
I am recruiting a postdoctoral researcher to work at Polytechnic Institute of Paris for 30 months, in the fields of #SoftwareEngineering and #Cybersecurity The recruited person will work on leveraging @swheritage as a knowledge base to improve the state of the art of (binary) software composition analysis (SCA), to detect the presence and details of #OpenSource software shipped within IT products. See https://institutminestelecom.recruitee.com/l/en/o/post-doctorante-ou-post-doctorant-en-genie-logiciel-et-cybersecurite-cdd-de-30-mois-2-5 for details and application instructions. #getfedihired
Institut Mines-Télécom - Post-doctoral fellow in software engineering and cybersecurity - 30 months contract

Who we are ?Télécom Paris, part of the IMT (Institut Mines-Télécom) and a founding member of the Institut Polytechnique de Paris, is one of France's top 5 general engineering schools.The mainspring of

Institut Mines-Télécom
It's not political to think people shouldn't be starved to death.

« Our small team vs millions of bots » by #FSF tech team

Aside the part about LLM crawlers which is scary! 😱

The post mentions:

« More recently, automated software build systems have become an issue for us. These usually go by the non-obvious term CI/CD, which stands for "continuous integration or continuous deployment." They send automated requests to check for new code on Savannah in order to rebuild their software. They often send far more requests than is necessary, which looks and acts like a DDoS attack even though it is not intended to be. »

🤔 Ah that’s annoying…

The time of the Voyager program seems as far as the Voyager spacecraft itself.

https://www.fsf.org/blogs/sysadmin/our-small-team-vs-millions-of-bots

Our small team vs millions of bots — Free Software Foundation — Working together for free software