Gabe Lynch
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gpxl.bsky.social
Gabe Lynch
@gpxl.bsky.social
440 followers 560 following 620 posts
cosmology phd student 🌳 | cmb and early universe cosmology @ UC Davis | East Bay
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gpxl.bsky.social
A zohran sign that says “Three Sheep for an ore” in reference to Catan
November 9, 2025 at 3:29 AM
gpxl.bsky.social
bring back this type of old guy
a black and white photo of william cullen bryant. he is old looking, mostly bald, with a bushy white beard a black and white photo of walt whitman. he has on a large brimmed hat and his face is partially obscured by a bushy white beard. he looks like a wizard. a black and white photo of charles darwin at age. he has a white beard, weathered face, and is wearing a black bowler hat
October 16, 2025 at 3:22 AM
gpxl.bsky.social
First time attempting a biggish climb and honestly, it was not as completely horrible as I expected. Definitely less intimidated by riding in the Berkeley hills now!
A photo of my bike near the Lawrence Science Center in the Berkeley hills. In the background is a view of Berkeley looking down towards the water.
August 31, 2025 at 7:45 PM
gpxl.bsky.social
Bela Fleck kinda looks like an aged Peter Gregory
Bela Fleck and the Flecktones
August 27, 2025 at 4:31 AM
gpxl.bsky.social
a pile of leaves
a single book leaf (that is, a page) among a pile of tree leaves
August 25, 2025 at 7:30 AM
gpxl.bsky.social
fiat soy milk
a pot containing bubbling, pureed soy bean, a step in the production of soy milk
August 19, 2025 at 5:13 AM
gpxl.bsky.social
no one wants to talk about this but Lego Island (1997) clearly endorsed Chicago deep dish pizza
A screenshot from Lego Island video game, showing a lego minifigure holding two pizzas, both of which have deep crusts.
August 18, 2025 at 8:28 PM
gpxl.bsky.social
bodega discourse has reached new heights, new yorkers are in awe of concrete mounds
A screenshot of a New York Times instagram post. The photo shows the entrance to a bodega along with a bright yellow concrete lamp sloping towards the door. The title reads “The Strange Beauty of New York’s Bodega Ramps”
August 18, 2025 at 7:06 PM
gpxl.bsky.social
Sunday night stock
A photo of a large blue stockpot filled with vegetables, like onions, carrots, and fennel, along with herbs on top. Everything is covered by water.
August 18, 2025 at 6:53 AM
gpxl.bsky.social
this is your brain on ChatGPT
a photo of grima wormtongue whispering evils into the ear of an old and weary theoden
August 13, 2025 at 3:46 PM
gpxl.bsky.social
I emailed to ask about artist information and this is the response I got. "Modern editing techniques" seems to imply AI generated to me. A shame too, since the idea is really cool!
A screenshot of an email inquiry about artist information for the posters linked to in OP. The text reads: "Thank you for your kind words about our new WPA-style series. We’ve loved bringing these to life as part of the celebration of 100 years of conservation in Illinois. All of the posters were designed in-house by ICF staff, using original photographs taken by ICF and Illinois Department of Natural Resources employees. Each one started with a place we know and love, then we used a variety of modern editing techniques to give it that vintage WPA look. It was created to be a single, cohesive series honoring our state parks. We hope to inspire people to get out and explore them. Proceeds from sales will go right back into conservation projects benefiting our parks and natural areas. All the best!"
August 11, 2025 at 8:33 PM
gpxl.bsky.social
If I could experience one location during its prime it would be Marshall Fields at christmas time
A black and white photo showing a christmas display at Marshall Fields, Chicago, circa 1960s
August 8, 2025 at 4:06 PM
gpxl.bsky.social
This is a stabilized version of the only actual footage of the atomic bombing of Hiroshima, recorded by Harold Agnew.
August 8, 2025 at 7:26 AM
gpxl.bsky.social
A three panel comic from @beetlemoses. The first panel shows a robot saying it is the most powerful computer in the world and can answer and question. In the second panel, a human says “who cares”. In the third panel, the robot is sad and emitting smoke.
August 7, 2025 at 7:15 PM
gpxl.bsky.social
okay okay the shinkansen is pretty sick! not that i wasn’t before but now Im fully high-speed-rail pilled, let’s get these in california! 🚅 🏙️
a picture of the japanese shinkansen pulling into tokyo station
July 28, 2025 at 5:03 AM
gpxl.bsky.social
... of CMB lensing constraints on m_nu, with a nice (imo) explanation of why primary CMB data, as well as primary+lensing, constrain the linear combinations of rho_cb and rho_nu that they do. #cosmology
Figure 2 from the linked paper. The x-axis is angular scale L, and the y-axis is a linear response factor. The plot shows a series of curves, color-coded by a third parameter "A", encoding how sensitive CMB lensing data is to neutrino mass. From the plot it is apparent that that sensitivity is a function of angular scale. Figure 4 from the linked paper. It shows constraints in the 2D plane spanned by the neutrino energy density and energy density in cold dark matter and baryons. There are a series of contours showing constraints from different datasets.
July 23, 2025 at 12:45 AM
gpxl.bsky.social
lotta talk about the drawing of the naked woman, and the sign-off of “may every day be a wonderful secret”, but wtaf is the rest of this
A screenshot of an excerpt from a recent Wall Street Journal article on Donald Trump and Jeffrey Epstein. The excerpt reads: “It isn’t clear how the letter with Trump’s signature was prepared. Inside the outline of the naked woman was a typewritten note styled as an imaginary conversation between Trump and Epstein, written in the third person. “Voice Over: There must be more to life than having everything,” the note began. Donald: Yes, there is, but I won’t tell you what it is. Jeffrey: Nor will I, since I also know what it is. Donald: We have certain things in common, Jeffrey. Jeffrey: Yes, we do, come to think of it. Donald: Enigmas never age, have you noticed that? Jeffrey: As a matter of fact, it was clear to me the last time I saw you. Donald: A pal is a wonderful thing. Happy Birthday — and may every day be another wonderful secret.”
July 18, 2025 at 12:17 AM
gpxl.bsky.social
to be honest this is way closer than I would have expected?
A two-paneled plot from the paper linked in the above post. The plot shows the power spectrum of density fluctuations for both the cosmic web, and for samples of brain tissue. There is a noticeable similarity between the two spectra, especially in comparison to other spectra that are shown, such as of clouds, tree branches, or turbulences.
July 15, 2025 at 11:59 PM
gpxl.bsky.social
every other month I discover a new (to me) John McPhee book. we are lucky he is so prolific
A photo of the John McPhee book “They’re in the River”. The cover has an illustration of a school of fish forming the shape of a larger fish.
July 5, 2025 at 2:36 AM
gpxl.bsky.social
chiCAHgo
a can of schlitz in a bowling alley
July 1, 2025 at 3:36 AM
gpxl.bsky.social
got an email from Box about some AI feature they have added / are adding. why does box need AI. it is essentially a folder. my folders don’t need to think
An email screenshot from the online storage company Box, showing some copy about AI integration
June 26, 2025 at 4:11 PM
gpxl.bsky.social
This tension projects differently into different LCDM extension model spaces, which manifest as preferences for non-LCDM parameter values. For example, increasing Alens to ~1.08 moves you in the right direction to get agreement between the two datasets.
A series of panels showing constraints in the Omega_m - omega_m rd squared planes, within Lambda CDM and some extensions, using CMB data, BAO data, and the combination. The combined constraints generally move away from the Lambda CDM value in the extension model spaces.
June 25, 2025 at 5:57 PM
gpxl.bsky.social
We see that there is a growing tension, within LCDM, between DESI and CMB data. We can see this in the Omega_m - hr_d plane, wherein the constraints from each do not overlap much. Using all CMB data, the tension is 2.8 σ, but using just ground-based CMB experiments it is 3.7 σ.

#cosmology
A corner plot showing constraints in the Omega_m - hr_d plane, from CMB and separately DESI BAO data. The constraints do not overlap much, indicating a tension between these datasets.
June 25, 2025 at 5:57 PM
gpxl.bsky.social
The new SPT-3G data allows for much sharper reconstructions of the recombination history due to the low noise, high resolution measurements of the CMB damping tail. Using CMB data alone we can reconstruct the ionization fraction across recombination to within ~40% of the standard value!

#cosmology
A plot showing the ionization fraction as a function of redshift during the era of cosmological recombination. There are shaded bands showing reconstruction uncertainties using different data sets. The Planck+SPT reconstruction is noticeable sharpened compared to the planck only reconstruction, reducing uncertainties by about a factor of 1.5-2.
June 25, 2025 at 5:57 PM
gpxl.bsky.social
SPT-3G D1 finds no evidence for excess lensing on its own, or in combination with other CMB datasets (all within 1.9 σ of Alens = 1). Is the lensing excess just a feature of the Planck data? It remains important to understand due to how it affects constraints on, e.g., neutrino mass.

#cosmology
A box and whisker plot showing values of the lensing parameter, A lens, coming from different data sets. All except the Planck values are consistent with the expected amount of lensing to within 2 sigma.
June 25, 2025 at 5:57 PM