Niko

a man says it 's very refreshing while wearing a jacket ALT: a man says it 's very refreshing while wearing a jacket

I was in a clusters telecon today (not my usual working group) and am so beyond impressed by the quality of plots people were showing. I find it so refreshing to see there are people out there who care about communicating their research

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Impact and interplay of $Λ$CDM analysis choices for LSST cosmic shear. N. C. Robertson et. al. https://arxiv.org/abs/2602.21863

Will do!

It’s still cold here but expecting temps in the 80s this week and in here for it

Starting the day shearing dead weeds in the forest and cutting through mountain mint — that sharp minty scent mixed with damp, rotting leaves — pure peace for the soul 🌿

And catching up with the wonderful folks over at @DukeLemurCenter is just 👌chefs kiss

Also Derivkit assumes you have your model and covariance and if you have that (which you obviously do), you can go wild with forecasts (just choose your derivative method wisely — consult workflows page in the docs)

You are welcome! If you need any clarification please do not hesitate to contact me.

I’d start with either example pages (forecasting) or workflows page (that one has a FAQ and some decision guidance)

That’s one hella parameter space!

Btw if you wanna go down the quicker route do diagnostics (Fisher/DALI), you can do so with derivkit docs.derivkit.org/main/

(Plug but I’m not ashamed 😂)

Two more works on the @arxiv 🥳🥳🥳

arxiv.org/abs/2602.21863

arxiv.org/abs/2602.21280

Here docs.derivkit.org/main/index.h...

Btw @rjme.bsky.social did you see the work Matthijs, a CMB colleague and I put up on arXiv the other day? Perhaps your students might be interested in trying it out

Didnt*

I also don’t know what’s up with autocorrect

I don’t know that!!! I do indeed smile a lot. Here’s me smiling with one helluva guy (photo taken few years ago)

Aaaaaand it’s officially on @arxiv.bsky.social 🥳🥳

arxiv.org/abs/2602.08078

Wanna do Fisher, XY Fisher or DALI with a chosen derivative method backend in a simple sleek Python way? Look no further, my friend. We got you!

Simple examples here

docs.derivkit.org/main/example...

Ok, aside that this was ten years ago (wthhhhell 😱) and I now feel ancient, it is actually nice to be reminded of good times during masters in Göttingen: Thorsten was my lecturer in cosmology and string theory courses and was super encouraging. Made me fall in love with cosmo 🤩

a cartoon of a tiger and a snake with the words " i have no time for that sort of nonsense " ALT: a cartoon of a tiger and a snake with the words " i have no time for that sort of nonsense "

Rest? 🤣🤣

Hahah oh no, we’re on a winter break.

We’ve been working every single day every day on the thing you are pushing us for 🤣

Actually — the first burek in the states since I moved 😱

Found the ingredients at Whole Foods

Also a selfie just because

Guess what we have been up to this whole time? 👀

Happy New Year, Arun!

X marks the spot

Happy first day of 2026!
It’s cold here but nothing beats the Carolina blue 😍

There probably are a few things better than talking to Alan Heavens about a potential idea then heading to the woods and mulching sumac trees (for the lemurs!) with your best guy on a warm December morning but I can’t think of any right now.
I just love the 🇺🇸
🍂🛻🪏

IT IS INSANE

Man I’m so freaking tired of it

a man with a ring on his finger is clapping ALT: a man with a ring on his finger is clapping

We are also not mathematicians but we use the math. So Dave, are you saying we should not be mathematically rigorous? We are also not writers but we write papers.
Stop making excuses for shitty work.
Also being good at code is not “less”. Jesus the arrogance.

Dios mio man
2/

a woman in a black dress is sitting at a table with wine glasses ALT: a woman in a black dress is sitting at a table with wine glasses

I swear if I hear another physicist say “we are not software engineers and we should not try to be” I’ll flip the freaking table.

No, Dave, it exactly is our job. You need to know how to tell computer to do physics.
And you are doing it in a very bad way.

1/

last day of classes!

here's the collection of Jupyter notebooks illustrating stellar physics concepts I made for my grad Stars class this semester:
zingale.github.io/stars/notebo...

#astro

If you are around these parts, come and join us for a pint and a nice story about the Universe

🤣🤣🤣🤣🤣🤣

A colorful berry pie. The crust is painted to look like Kitt Peak National Observatory, scattered with small white telescopes and framed by colorful pie-crust stars.

Happy Thanksgiving :)
@desisurvey.bsky.social

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Investigating the Dark Energy Constraint from Strongly Lensed AGN at LSST-Scale. Sydney Erickson et. al. https://arxiv.org/abs/2511.13669