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Ronaldo V. Lobato

@rvlobato.com
248 followers 797 following 46 posts

Physicist, researcher @ CBPF, traveler and #FOSS advocate. Paraense de Igarapé-Miri, físico, pesquisador do CBPF, viajante e entusiasta GNU/Linux. Il segreto della vita è questa non è un'esercitazione. rvlobato.com mathstodon.xyz/@ronaldo

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Reposted by Ronaldo V. Lobato
Grupo de Astrofísica de Partículas do CBPF @astroparticulas.bsky.social · 08/10/2026
O Grupo de Astrofísica de Partículas do CBPF investiga o Universo em suas condições mais extremas, utilizando partículas de altíssima energia: raios gama, raios cósmicos, neutrinos e ondas gravitacionais. Mais informações -> astroparticulas.pages.cbpf.br/grupo-astro-...
astroparticulas.pages.cbpf.br
Grupo de Astrofísica de Partículas — CBPF
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Nobel Prize @nobelprize.org · 06/10/2026
Learn more about the 2026 Nobel Prize in Physics Press release: bit.ly/4yiVKzP Popular information: bit.ly/3V150cU Advanced information: bit.ly/4AeS03D
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Emil Jacobs - Collectifission @collectifission.greennuclear.online.ap.brid.gy · 08/10/2026
The @gentoo project is looking for hardware sponsors. Are you or your organisation interested in supporting Gentoo via an infrastructure sponsorship? Please reach out to them! www.gentoo.org/news/2026/10/07/infr…
gentoo.org
Gentoo infrastructure sponsors wanted! – Gentoo Linux
News and information from Gentoo Linux
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Grupo de Astrofísica de Partículas do CBPF @astroparticulas.bsky.social · 26/09/2026
Dois representantes do CLAF e diplomata brasileiro, foram a uma montanha de altura vertiginosa na Bolívia para lançar uma ideia tão desafiadora como importante: transformar um laboratório de física que resvala as nuvens em patrimônio cultural da humanidade. claffisica.org.br/news-item/cl...
claffisica.org.br
CLAF propõe que o Laboratório de Física Cósmica de Chacaltaya seja Patrimônio Cultural da Humanidade
[25/09/2026]. Dois representantes do Centro Latino-Americano de Física (CLAF), acompanhados de um diplomata brasileiro, foram a uma montanha de altura
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Prof Anna Watts @profannawatts.bsky.social · 02/09/2026
New NICER pulsar radius from the X-PSI team! For the gloriously chunky 1.9 solar mass pulsar PSR J1614-2230. Led by Lucien Mauviard, a finishing PhD student in Seb Guillot's group in Toulouse. #highenergyastro 🔭🧪 arxiv.org/abs/2609.00172
arxiv.org
A NICER view of PSR J1614$-$2230: a massive and compact millisecond pulsar
Using pulse profile modeling, we obtain the mass-radius measurement of a millisecond pulsar (MSP) with data from the Neutron Star Interior Composition ExploreR, XMM-Newton and the Chandra X-ray Observ...
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passagemath @passagemath.org · 30/08/2026
Release candidate 10.8.11.rc0 of 🐙passagemath, a comprehensive #OpenSource #Mathematics system in #Python, the pip-installable modularized portable compatible full-featured fork of #SageMath. New 3D graphics support w/ plain Python @jupyter.org kernels, e.g. Google Colab. github.com/passagemath/...
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Igalia @igalia.com · 19/08/2026
On 29 and 30 August, Igalians will be at FOSForums 2026 in Campinas, Brazil, presenting talks on ways to turn bug finds into kernel fixes and close-in memory profiling in Linux. If you will be nearby, don't miss them!
IGALIA @ FOSFORUMS 2026

From crash to upstream: transforming fuzzer reports into kernel patches
Heitor Alves de Siqueira

Linux page_owner: memory profiling at page granularity with stack traces
Mauricio Faria de Oliveira
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Firefox @firefox.com · 10/08/2026
Our support for uBlock Origin isn't going anywhere.
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Prof Heino Falcke @hfalcke.mastodon.social.ap.brid.gy · 13/07/2026
I see a lot of anti-AI-rhetoric here, but very little pragmatic ideas on how to change things. The answer here is „don’t touch it“, but that will not change the world, except that it makes you feel good and in a few years you can say „told you so“. It is not that AI does not work, as often said […]
mastodon.social
Original post on mastodon.social
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Sean Carroll @seanmcarroll.bsky.social · 12/07/2026
I'm sad to report that Mark Wise, theoretical physicist at Caltech, has passed away. He was my friend and collaborator, a giant of theoretical physics, and just one of my favorite people. RIP. www.pma.caltech.edu/people/mark-...
pma.caltech.edu
Mark B. Wise - Division of Physics, Mathematics and Astronomy
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Ronaldo V. Lobato @rvlobato.com · 29/06/2026
It was a day to test our hearts :p
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Prof Anna Watts @profannawatts.bsky.social · 19/05/2026
Also on arXiv today, a very cool paper led by Melissa Mendes and the TU Darmstadt team on improved dense matter equation of state constraints using our NICER mass-radius measurements. #highenergyastro #densematter 🔭🧪 arxiv.org/abs/2605.18560
arxiv.org
Astrophysics equation of state inference with Bayesian chiral effective field theory uncertainties
We investigate Bayesian chiral effective field theory ($χ$EFT) uncertainties, which assign a statistical interpretation to equation of state (EOS) distributions near nuclear saturation density, n$_0$,...
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CERN @cern.bsky.social · 19/06/2026
François Englert (1932 – 2026) It is with great sadness that we announce that Belgian theoretical physicist, François Englert, has passed away at the age of 93. Read more: home.cern/francois-eng...
François Englert during a visit to CERN in 2014 (Image: CERN)
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Tiago Peixoto @tiago.skewed.de · 11/06/2026
Periodic reminder that, contrary to widespread claims in recent years, it’s not true that graphs encode “pairwise” interactions. Graphs encode neighborhoods—sets of nodes incident to other nodes—on which multivariate interactions can be defined. skewed.de/lab/posts/hi... 1/2
skewed.de
Higher orders need higher standards – Inverse Complexity Lab
Research group on inverse problems in complex systems and network science.
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Ronaldo V. Lobato @ronaldo.mathstodon.xyz.ap.brid.gy · 29/05/2026
Crie um novo e eis que o Arviz instala a nova versão e quebra montes de apis e todo meu notebook. Fixo a versão que estava funcionando, mas as dependências não se acertam, começa a dar problema no scipy, resolve e começa no matplotlib, e começa dar conflito em outro lado. Bom desisto e decido […]
mathstodon.xyz
Original post on mathstodon.xyz
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Brandt Gaches @brandt-gaches.space · 20/03/2026
Apparently, arXiv has been looking into adding support for @typst.app! I had idle hands during a day off, so I wrote up a template for the Open Journal @ojastro.bsky.social that is fairly complete with features (see image). It can actually do a bit more than the LaTeX template, from Typst!
Screenshot of a new Typst template for the Open Journal of Astrophysics, highlighting the title block, abstract, and section headings.
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Ronaldo V. Lobato @rvlobato.com · 07/05/2026
Sagemath 10.9 was released on 05-04. www.sagemath.org/download-sou... It is developed by volunteers and combines hundreds of open source packages. 88 people contributed to this. Of those, 27 made their first contribution to Sage: #freesoftware, #opensource, #sagemath, #mathematics, #mathematica
sagemath.org
SageMath Mathematical Software System - Sage
SageMath is a free and open-source mathematical software system.
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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 20/04/2026
This person on Twitter is taking my threads and posts and presenting them verbatim as his own.
The profile reads:

Akshat @star_stufff
Follows you
theoretical physics
© earth
earth • Joined November 2023
985 Following 3,030 Followers
Followed by Martin Bauer, Ash Jogalekar, Greg Egan, and 7 othersThe post reads:

Tweet
Akshat •
@star_stufff
Albert Einstein passed away on this day in 1955, from complications associated with a ruptured abdominal aneurysm. His doctors recommended surgical intervention. Einstein replied "I have done my share; it is time to go. I will do it elegantly."
Image: R. Morse/LIFEIt reads:

Tweet
Akshat O @star_stufff
In 1978, Yau and Schoen used variational methods to give the first proof of the Positive Energy Conjecture in general relativity (Witten gave a separate proof two years later that used entirely different methods). The paper was submitted in September and appeared in print in February of the following year.
In general relativity, unlike in other classical field theories, there is no meaningful local notion of the energy density of the gravitational field. You can't just visit every point in a region, measure some quantity, add it to a running total, and then call that result the total energy of a gravitating system. One way to see the reason for this obstruction is to appeal to the
hinh imnlinethat
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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 03/03/2026
The spacing on the demo's "Outline" slide is like nails on a chalkboard, but I really like seeing folks center accessibility in LaTeX tools (this one uses LuaLaTeX). Historically they have not been good at this. 🧪 beameratelier.com/ltx-talk.html
beameratelier.com
ltx-talk — Beamer Atelier
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Christopher Berry @cplberry.bsky.social · 23/02/2026
I would like to see Altman's validation loss curve, as I suspect something may have gone wrong
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Peter Coles 🏳️‍🌈 🏳️‍⚧️ 🇮🇪 @telescoper.bsky.social · 22/02/2026
Call for Editors at the Open Journal of Astrophysics The number of papers submitted to the Open Journal of Astrophysics continues to rise, as demonstrated by this nice graphic which shows the stats for new submissions for the last five years: It's very clear that the thicket is getting thicker!…
telescoper.blog
Call for Editors at the Open Journal of Astrophysics
The number of papers submitted to the Open Journal of Astrophysics continues to rise, as demonstrated by this nice graphic which shows the stats for new submissions for the last five years: It's very clear that the thicket is getting thicker! The increasing number of articles is of course very welcome indeed, but it is increasing the load on our Editorial Board and that includes me!
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Prof Anna Watts @profannawatts.bsky.social · 02/01/2026
Sneaking in at the end of 2025, our Reviews of Modern Physics article on 'Neutron stars and the dense matter equation of state' is finally published! #highenergyastro 🔭⚛️ journals.aps.org/rmp/abstract...
journals.aps.org
Neutron stars and the dense matter equation of state
Neutron stars, the remnants of supernova explosions, are the densest objects in the Universe. A typical neutron star has a mass between one and two solar masses, and a radius of around 12 km. The dens...
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Daniel S. Katz @danielskatz.org · 09/12/2025
I've collected a set of papers and articles that discuss errors in research due to software errors, in a GitHub repo: github.com/danielskatz/.... I think this could be a useful resource for many purposes, and additional contributions are welcome.
github.com
GitHub - danielskatz/errors-due-to-research-software: This repo is a list of papers that discuss errors in research due to software errors
This repo is a list of papers that discuss errors in research due to software errors - danielskatz/errors-due-to-research-software
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Collabora @collabora.com · 13/11/2025
Rust in Android: move fast and fix things security.googleblog.com/2025/11/rust... #Rustlang #Tyr
security.googleblog.com
Rust in Android: move fast and fix things
Posted by Jeff Vander Stoep, Android Last year, we wrote about why a memory safety strategy that focuses on vulnerability prevention in ...
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Bahram Shakerin @bahramshakerin.bsky.social · 05/11/2025
[J. J. Sakurai Prize for Theoretical Particle Physics] www.aps.org/funding-reco...
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Python Software Foundation @python.org · 27/10/2025
TLDR; The PSF has made the decision to put our community and our shared diversity, equity, and inclusion values ahead of seeking $1.5M in new revenue. Please read and share. pyfound.blogspot.com/2025/10/NSF-... 🧵
python.org
The official home of the Python Programming Language
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Sean Carroll @seanmcarroll.bsky.social · 26/10/2025
Hilariously bad idea. In my subfield author lists are almost always alphabetical!
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daniel:// stenberg:// @bagder.mastodon.social.ap.brid.gy · 21/10/2025
I am awarded a gold medal by the Royal Swedish Academy of Sciences for my work on #curl daniel.haxx.se/blog/2025/10/21/a-ro…
daniel.haxx.se
A royal gold medal
_The Royal Swedish Academy of Sciences_ (IVA, the same org that selects winners for three of the Nobel prize categories) awards me a gold medal 2025 for my work on curl. This academy, established 1919 by the Swedish king Gustav V, has been awarding _great achievers_ for over one hundred years and the simple idea behind the awards is, as quoted from their website: > Gold medals are awarded every year to people who, through outstanding deeds, have contributed to creating a better society. I am of course humbled and greatly honored to have been selected as a receiver of said award this year. To be recognized as someone who **have contributed to creating a better society** , selected by top people in competition with persons of remarkable track records and achievements. Not too shabby for a wannabe-engineer like myself who did not even attend university. There have been several software and tech related awardees for this prize before, but from what I can tell I am the first Open Source person to receive this recognition by the academy. ## Justification The Academy’s justification is given in Swedish (see below) but it should be translated roughly like this: _System developer Daniel Stenberg is awarded the IVA Gold Medal for his contributions to software development, where he has been central to internet infrastructure and free software. Through his work with curl, the tool that is now used by billions of devices worldwide, he has enabled reliable and secure data transfer over the internet. Not just between programs in traditional computers, but everything from smartphones and cars, to satellites and spacecraft._ The original Swedish “motivering”: _Systemutvecklare Daniel Stenberg tilldelas IVAs Guldmedalj för sina insatser inom mjukvaruutveckling där han haft en central betydelse för internetinfrastruktur och fri programvara. Genom sitt arbete med curl, verktyget som i dag används av miljarder enheter världen över, har han möjliggjort tillförlitlig och säker dataöverföring över internet. Inte bara mellan program i traditionella datorer utan allt från smartphones och bilar, till satelliter och rymdfarkoster._ ## The ceremony The associated award ceremony when the physical medal is handed over happens this Friday at the Stockholm City Hall‘s Blue Hall, the same venue used for the annual Nobel Prize banquet. I have invited my wife and my two adult kids to participate in those festivities. ## A _second_ medal indeed Did I not already receive a gold medal? Why yes, I did eight years ago. Believe me, it does not _get old_. This is something I can get used to. But yes: it is beyond crazy to get one medal in your life. Getting _two_ is simply incomprehensible. This is also my _third_ award received within this calendar year so I completely understand if you already feel bored by my blog posts constantly banging my own drum. See European Open Source Achievement Award and Developer of the year for the two previous ones. ## The medal I wanted to include a fine high resolution image of the medal in this post, but I failed to fine one. I suppose I will just have to make a few shots by myself after Friday and do a follow-up post!
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Matthias Kirschner @kirschner.mastodon.social.ap.brid.gy · 14/10/2025
Today on the international e-waste day, do the final move to update your computer from Microsoft #Windows10 to an operating system that respects your freedom to use, study, share, and improve the software you use, like: @archlinux @debian @elementary @fedora @FreeBSDFoundation @gentoo […]
mastodon.social
Original post on mastodon.social
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CosmicRami 🏳️‍🌈🏳️‍⚧️ @rami.spaceaustralia.com · 14/10/2025
There are reasons* why radio astronomers are also cautious in publishing certain types of data ..... Let's just say that we see *a lot* of satellite transmissions in our observations ....
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Matthew Green @matthewdgreen.bsky.social · 07/10/2025
I hear that the EU ChatControl situation is going better today. I cannot believe how close the EU has gotten to passing this crazy regulation.
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Ronaldo V. Lobato @ronaldo.mathstodon.xyz.ap.brid.gy · 05/10/2025
F-Droid and Google's Developer Registration Decree f-droid.org/en/2025/09/29/google-de… "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 […]
mathstodon.xyz
Original post on mathstodon.xyz
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Astrobites @astrobites.bsky.social · 03/10/2025
From Brandon Pries: How does one prevent a black hole from growing in a tiny galaxy? Today’s authors investigate two potential mechanisms! 🔭✨☄️ astrobites.org/2025/10/03/b...
astrobites.org
Does Feedback Support Massive Black Hole Growth in Dwarf Galaxies?
How does one prevent a black hole from growing in a tiny galaxy? Today's authors investigate two potential mechanisms!
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Alexandre Oliva @lxo.snac.lx.oliva.nom.br.ap.brid.gy · 03/10/2025
congratulations and much gratitude to @iank@hostux.social for taking up the position of president of the Free Software Foundation. and happy 40th to the @fsf@hostux.social
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Science Explorer (SciX) @scixcommunity.bsky.social · 29/09/2025
A natural evolution of ADS, SciX brings its powerful capabilities into new domains. Expanded coverage, intuitive search, smart recommendations, and tools for collaboration. SciX makes research more discoverable, connected, and accessible than ever before. scixplorer.org/scixblog/scix-launch
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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 26/09/2025
Happy 120th birthday, special relativity! Albert Einstein introduced special relativity in the paper "On The Electrodynamics Of Moving Bodies," published in Annalen der Physik #OTD in 1905. 🧪 ⚛️ 🔭 Manuscript: onlinelibrary.wiley.com/doi/abs/10.1... English: www.fourmilab.ch/etexts/einst...
A black and white photo of Albert Einstein, around age 25, sitting at a desk. He is a wearing a flannel suit and resting his right arm on the desk. Einstein is looking to the left of the photographer in this posed photo.The first paragraph of the paper, in German. Translated to English is reads:

It is known that Maxwell's electrodynamics—as usually understood at the present time—when applied to moving bodies, leads to asymmetries which do not appear to be inherent in the phenomena. Take, for example, the reciprocal electrodynamic action of a magnet and a conductor. The observable phenomenon here depends only on the relative motion of the conductor and the magnet, whereas the customary view draws a sharp distinction between the two cases in which either the one or the other of these bodies is in motion. For if the magnet is in motion and the conductor at rest, there arises in the neighbourhood of the magnet an electric field with a certain definite energy, producing a current at the places where parts of the conductor are situated. But if the magnet is stationary and the conductor in motion, no electric field arises in the neighbourhood of the magnet...
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Jason Wright @astrowright.bsky.social · 25/09/2025
She basically invented astrophysics. She proved the laws of chemistry, quantum mechanics, and statistical mechanics, not just gravity, applied universally. She determined the composition of the sun and primacy of hydrogen in the universe. She advised the PhDs of Frank Drake and Frank Kameny.
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Chris Rackauckas @chrisrackauckas.bsky.social · 22/09/2025
Scientific Modeling Cheatsheet: #MATLAB vs #Python vs #Julialang Side-by-side comparison for: • Differential equations • Optimization • Automatic differentiation • Symbolic computing • More! Highlights ecosystem differences & best practices. sciml.github.io/Scientific_M...
sciml.github.io
Scientific Modeling Cheatsheet – MATLAB – Python – Julia Quick Reference
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Fedora Project @fedora.fosstodon.org.ap.brid.gy · 21/09/2025
Windows 10 support ends on October 14. Help the people around continue to be protected by helping them switch to Linux. They don't need to go buy a new computer just because Microsoft made a decision for them. Follow @Endof10 for success stories and resources for how to help people switch! […]
fosstodon.org
Original post on fosstodon.org
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Lukasz Olejnik @lukaszolejnik.bsky.social · 18/09/2025
DeepSeek R1 was trained at a cost of about $294,000 for the reinforcement-learning phase alone, and roughly $6 million including preparation of the base model—many times cheaper than projects by a U.S. company that exceed $100 million. The www.nature.com/articles/s41...
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Caltech IPAC @caltechipac.bsky.social · 18/09/2025
The official number of exoplanets has surpassed 6,000! And you can access data on all 6,007 of them right here at IPAC 📈 🪐 Watch the video & read all about the center of the exoplanet universe (also known as NExScI!) here: www.ipac.caltech.edu/news/the-nas...
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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 09/09/2025
This is exactly right, and students are often surprised to hear it. It’s one of the first things I explain in the “Should I use LLMs?” portion of my syllabus.
It reads “But that's not the only problem. Interactions with LLMs feel like a dialog, so it's natural to think the usual rules of conversation apply. You ask a question and expect the response will be an answer to that question. It's important to understand that this is not what's happening. An LLM is designed to generate statistically likely responses to the question "What would an answer to this query sound like?" This is not the same thing as answering the question. It might produce what you are looking for, or it might not. This is one reason why output from an LLM will sound authoritative even when it's wrong, and apologetic when mistakes are pointed out. It isn't authoritative or apologetic, and it isn't "thinking" about the question. These are just the sorts of responses that best fit a very complicated set of likelihood criteria.”
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Tiago Peixoto @tiago.skewed.de · 05/09/2025
The power law found is no different from the 1/r^a scaling present in the age-old and ubiquitous gravity law of mobility... It's literally the exact same thing. 🤷 But it's interesting that it seems to go all the way down to tens of meters.
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Dr Jan Eldridge @astro-jje.bsky.social · 05/09/2025
One of the awesome bits of supernova science I always love is when someone finds a new ancient record of a supernovae! In this case new Arabic records for SN1181 and SN1006 from poems! arxiv.org/abs/2509.04127
arxiv.org
New Arabic records from Cairo on supernovae 1181 and 1006
The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000-5000 yr), the unusual star IRAS 00500+6713 with a surroundin...
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passagemath @passagemath.org · 30/08/2025
Just released: passagemath-10.6.12 github.com/passagemath/... #Python #SageMath #FOSS #MathSky
github.com
Release passagemath-10.6.12 · passagemath/passagemath
New pip-installable packages for mathematical databases passagemath-database-stein-watkins (sdist only) passagemath-database-stein-watkins-mini All databases that were available as Sage packages ...
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Dan Yocum. Ugh. @yocum137.bsky.social · 29/08/2025
🧪 Scientists, even if the paper you wrote was paid for by government grant dollars and is essentially in the public domain, Anthropic isn’t giving you credit for your work. File a claim and be named on the class action lawsuit.
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Ars Technica @arstechnica.com · 27/08/2025
arstechnica.com
More scientists choose Bluesky over Twitter
It’s not just you. Survey says: “Twitter sucks now and all the cool kids are moving to Bluesky”…
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John Scalzi @scalzi.com · 27/08/2025
FUCK YEAH SCIENCE arstechnica.com/science/2025...
arstechnica.com
Bluesky now platform of choice for science community
It’s not just you. Survey says: “Twitter sucks now and all the cool kids are moving to Bluesky”…
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