iiinova — where your digital self keeps evolving

Gabe Lynch @gpxl.bsky.social · 11/10/2026

I know every fan of a losing team thinks this, but man could these announcers be any more in the bag for the Guardians? Yeesh!

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Gabe Lynch @gpxl.bsky.social · 09/10/2026

You might be wondering, how are Sox fans feeling right now? Well I can tell you. Nothing. Feel nothing.

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Gabe Lynch @gpxl.bsky.social · 09/10/2026

IT MUST BE THE SOX (I say as I nervously watch this game slip away…) I agree the rain delay was the moment of the jump.

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Gabe Lynch @gpxl.bsky.social · 09/10/2026

The Cubs winning in 2016 put us in this timeline and by god the Sox winning this year will take us out.

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Gabe Lynch @gpxl.bsky.social · 08/10/2026

Do we think Trump personally uses LLMs and if so how cooked are we?

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

I have a new paper out today that I've been working on for the past ~year, which I'm really proud of! We place limits on the small-scale electron power spectrum at early times using the CMB, including effects related to photon transport in a clumpy medium. arxiv.org/abs/2610.05147

arxiv.org

Limits on the size of electron density fluctuations in the early universe and implications for the Hubble tension

Little is known about the early universe on scales smaller than those resolved by the cosmic microwave background (CMB), where electron density fluctuations on kiloparsec to megaparsec scales are expe...

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Gabe Lynch @gpxl.bsky.social · 07/10/2026

Is the "i might have never known" beetlemoses comic the most uplifting comic on the internet? discuss

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

I'm very happy to answer any questions about the above! And very excited to continue building on the ideas that have come out of this project. First, I need someone to hire me... (I'm on the job market this year 😬)

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

We released the code used for these constraints here: github.com/gplynch619/c... If you have a model that predicts the variance and coherence scale of electron clumps, (mostly) regardless of mechanism, you can use this code to place constraints with the CMB just by writing a few Python functions.

github.com

GitHub - gplynch619/classito: Small-scale electron inhomogeneities in CLASS.

Small-scale electron inhomogeneities in CLASS. . Contribute to gplynch619/classito development by creating an account on GitHub.

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

On a broader note, this project taught me a lot: stochastic calculus for modeling the fluctuations, emulator accelerated inference, systematic error estimates, even details about the structure of the Einstein-Boltzmann system (check out the appendices...) It was a ton of work! But well worth it.

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

Clumpy scenarios like this have been proposed as a H0 tension resolution, so we revisit these scenarios with the new effect modeled. If we only had Planck data, then the CMB would be compatible with SH0ES assuming our model. (Un)Fortunately, we have data from ACT and SPT that heavily constrain us.

A plot showing the inferred value of H0 with different data combinations and for two different models. The upper panel shows a model where we only consider the effects of electron fluctuations on the mean recombination history. The second panel also includes a new modified photon transport effect, which opens new degeneracies and allows for higher H0.

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

For larger patch sizes, our upper limits are within a factor of 2 of BBN limits (but apply to any clumpiness generated between BBN and last-scattering of the CMB. More broadly) this is a demonstration of how we can use the CMB to learn about scales it does not directly resolve.

A plot showing upper limits on the electron density power spectrum from CMB data. The scales that are constrained are smaller than what are directly resolved by the CMB. At larger scales, the plot shows that the upper limits are more stringent, demonstrating sensitivity to the scale of fluctuations.

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

We model the fluctuations in terms of the field variance, and the coherence length of a typical fluctuation patch. The modified photon transport effect ends up looking like extra diffusion damping in the CMB, so despite these patches being very tiny, we are sensitive to how big they are.

A plot showing the changes in CMB power spectra due to clumpy electrons. The changes are broken into different channels: those due to the change in the mean recombination history, and those due the modified photon transport through a clumpy medium. The former have the same signatures as a shift in the acoustic peaks of the power spectra, whereas the later looks like extra diffusion damping.

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

The fluctuations we are interested in here could be generated by many beyond-LCDM models. Primordial magnetic fields, isocurvature perturbations, gravitational infall to early collapsed objects, local energy injection, etc. All of these could generate density fluctuations at 10kpc-1Mpc scales.

A figure from the paper, showing different time-profiles of the electron density over a 2 Mpc window, showing fluctuating patches. The top panel has a smaller typical patch size than the bottom. Both look like noisy, correlated stochastic processes.

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Gabe Lynch @gpxl.bsky.social · 06/10/2026

arxiv.org

Limits on the size of electron density fluctuations in the early universe and implications for the Hubble tension

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Paper and Ink @paperandink.bsky.social · 06/10/2026

Any one need a microfilm scanner? Our library will scrap one on Saturday. It works. All our stuff is digitized. You pay for shipping or come pick it up near Erie,PA.

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Gabe Lynch @gpxl.bsky.social · 04/10/2026

red cardigan photo has lived rent free in my head since the first time i saw you share it

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Gabe Lynch @gpxl.bsky.social · 04/10/2026

Thank you so much for all of these! Very much appreciated

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Gabe Lynch @gpxl.bsky.social · 04/10/2026

I’m a recent follower and interested in learning more about your perspective and what’s informing it, because I think I largely agree and that you are articulating something that I have not been able to! If you have a moment could you recommend any literature you’ve found useful? Thanks.

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Lyndie Chiou @lyndie.bsky.social · 03/10/2026

This nearby, faint galaxy helped prove that the universe is bigger than just our Milky Way. It has barely any heavy elements, so it looks a lot like galaxies from the early Universe. So fascinating!!! Image credit: ~11 hours on my tiny telescope #astrophotography #astronomy 👩‍🔬🔭

A diffuse blob that is actually millions of stars that are part of an irregular barred dwarf galaxy. There's a field of stars around it that are from our Milky Way galaxy

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Gabe Lynch @gpxl.bsky.social · 03/10/2026

I drove through here once and there was a dispensary with a giant T-Rex with a joint statue out front. It was awesome.

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Gabe Lynch @gpxl.bsky.social · 03/10/2026

this project rocks, these are so great

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Gabe Lynch @gpxl.bsky.social · 01/10/2026

The death penalty is cruel, sadistic, and immoral. The state should never have the authority to execute someone and it is enraging that far too many treat this as normal. Good God.

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The Great Pumpkin Papers 🎃🎃🎃 @professormusgrave.bsky.social · 30/09/2026

It certainly seems like material explanations can’t explain all of voters’ behaviors—but what if there were another motivation?

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John Hatch @johnhatch.bsky.social · 30/09/2026

White Sox have been blessed by the Pope. Astros quaking in their cleats.

A letter from the Pope to the Chicago White Sox.

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Gabe Lynch @gpxl.bsky.social · 28/09/2026

Fraternal and community orgs (e.g. Rotary) seemingly used to be more prominent.

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Gabe Lynch @gpxl.bsky.social · 21/09/2026

Great photos, thanks for sharing. Any rough estimate of when these would have been taken?

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Joe Mason @moreorloess.bsky.social · 21/09/2026

A couple of my dad's black and white photos of abandoned buildings and towns on the Great Plains. I don't have locations, except the one on the right looks like the Nebraska Sandhills.

Black and white photo of an abandoned main street in a small town, mostly brick commercial buildings, weeds coming up from the sidewalk.

An old car, a shed, and an abandoned house in a grassland setting, maybe the Nebraska Sandhills.

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Gabe Lynch @gpxl.bsky.social · 18/09/2026

context is countering the claim that "Anyone who has looked into this is freaked out", including people who are not obviously linked to weird AI cultish beliefs (e.g. journalists covering this)

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Gabe Lynch @gpxl.bsky.social · 18/09/2026

Does anyone have recommended reading on why AI doom is NOT the likely outcome, ideally from AI researchers? To be clear this is my belief (exceedingly unlikely) but given the flood of AI = skynet articles this past week, it would be good to have some references when this invariably comes up.

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Gabe Lynch @gpxl.bsky.social · 18/09/2026

Nothing Compares In Comparison 2 U

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Gabe Lynch @gpxl.bsky.social · 18/09/2026

I am curious: how do the following relations semantically differ to you when reading an academic paper (if they differ at all): 1. ~ 2. ≈ 3. ≃ 4. ≅

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Gabe Lynch @gpxl.bsky.social · 16/09/2026

just logged on, is there a specific reason everyone is talking about rationalist cults / aella / the insanity of the agentic class?

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Gabe Lynch @gpxl.bsky.social · 12/09/2026

Your title is admittedly far less shoe-horned than mine!

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Gabe Lynch @gpxl.bsky.social · 11/09/2026

I have never titled a paper in reference to the Beatles but did once give a talk with title

The text "Negative M_nu Mystery Tour" with the iconic Beatles rainbow lettering

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Terence Tao @teorth.bsky.social · 11/09/2026

A group of 25 Fields Medalists, including myself, have made a joint declaration on Math and AI: mathandai.org . We welcome additional signatories. See also this article in the Economist announcing the declaration: www.economist.com/science-and-...

mathandai.org

Declaration — Math and AI

Read the declaration and add your name.

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Gabe Lynch @gpxl.bsky.social · 11/09/2026

This is an interesting study but man it sucks always wondering, in the back of my mind, if people will ever mistake any of my writing for LLM produced stuff because it has the 'wrong words'.

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Ancient Egyptian Prayer Bot @egyptianprayerbot.bsky.social · 10/09/2026

I am Yesterday, I know Tomorrow. (BDB)

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Gabe Lynch @gpxl.bsky.social · 10/09/2026

if AGI superintelligence poses a threat to humanity, and most future intelligences are therefore artificial, then what are the odds that we are interacting with the very first few AGIs? The Bayesian priors are not very favorable.

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CosmicRami 🏳️‍🌈🏳️‍⚧️ @rami.spaceaustralia.com · 09/09/2026

The "$22M in computing power" is a metric. That kind of money, that these orgs have, could have been spent on 440 PhDs @ $50K each. If this truly was about solving a problem for maths, for humanity, for whatever, 440 PhDs would have had far greater scale of global impact.

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Gabe Lynch @gpxl.bsky.social · 09/09/2026

hit dog: and another thing: im not hollering. please dont put in the newspaper that i hollered.

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Gabe Lynch @gpxl.bsky.social · 08/09/2026

I think you are being less reasonable, and less charitable, than you think you are by assuming others aren’t as engaged as you on the reality of what AI can and cannot do, even within this thread.

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Gabe Lynch @gpxl.bsky.social · 08/09/2026

If it did not, their offer of authorship to Buckmaster on the condition that Alpöge be left off is extremely academically dishonest. I don't think it is an exaggeration to say that this is the type of thing that could leave to discipline in a normal academic setting.

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Gabe Lynch @gpxl.bsky.social · 08/09/2026

That is not my contention. My contentions are twofold: if it is the case that their model drew on the drafts Buckmaster and Alpöge had uploaded into codex, then their result does not give proper accreditation and amounts to stealing. By their own admission, they cannot rule this out.

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Gabe Lynch @gpxl.bsky.social · 08/09/2026

It would be without proper accreditation of prior work, even if that work had been communicated privately it is still expected to be cited. No such accreditation has happened here. Your version of “how math works” simply does not align with standard practice.

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Gabe Lynch @gpxl.bsky.social · 08/09/2026

Not only this, but according to Buckmaster’s statement on the sequence of events, they actually offered him authorship on this result if he agreed that Alpöge (anthropic employee) would be left off. That is highly suspicious, and academically dishonest on its own!

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