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Nicolas Tessore @ntessore.bsky.social · 27/10/2025

Maybe not? But take BLAS: on my Mac, uv's numpy uses newaccelerate, which is significantly better than openblas, and also the best you can get from conda. But on this random Unix machine I'm connected to, uv's numpy uses scipy-openblas, and I can do better with a specialised implementation.

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Nicolas Tessore @ntessore.bsky.social · 26/10/2025

There are also packages where the conda version is significantly faster, due to better compiled dependencies. But uv is definitely a step in the right direction generally!

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Nicolas Tessore @ntessore.bsky.social · 21/10/2025

A new 2025.2 release of GLASS, working towards Array API compatibility (incl. jax). This release moves the GLASS to the Cosmology API. That means you can easily run with a background cosmology provided by CAMB, Astropy, or your own classes through a common API standard. github.com/glass-dev/gl...

github.com

Release glass 2025.2 · glass-dev/glass

Second 2025 release of GLASS. Release note Changelog Full list of commits

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Reposted by Nicolas Tessore

The Open Journal of Astrophysics @ojastro.bsky.social · 14/10/2025

New Publication at the Open Journal of Astrophysics: "Shot noise in clustering power spectra" by Nicolas Tessore (University College London, UK) and Alex Hall (University of Edinburgh, UK) doi.org/10.33232/001...

doi.org

Shot noise in clustering power spectra | Published in The Open Journal of Astrophysics

By Nicolas Tessore, Alex Hall. A discussion of the effects of 'shot noise', an additive contribution due to degenerate pairs of points, in angular galaxy clustering power spectra

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Nicolas Tessore @ntessore.bsky.social · 07/10/2025

Exactly right! The puzzle is to invent something that makes sense

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Nicolas Tessore @ntessore.bsky.social · 06/10/2025

This has been puzzling me. Given a set of redshift distributions nᵢ(z), i = 1, 2, ..., it's easy to work out the variance σᵢ² for each bin. How to fill in the rest of the "covariance matrix" so that it has intuitive properties? E.g. perfectly overlapping bins having σᵢⱼ = σᵢ² = σⱼ².

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Nicolas Tessore @ntessore.bsky.social · 04/08/2025

Play and score! (Bit unfair perhaps)

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Reposted by Nicolas Tessore

AstroArxiv @astroarxiv.bsky.social · 08/07/2025

Shot noise in clustering power spectra. Nicolas Tessore et. al. arxiv.org/abs/2507.03749

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Nicolas Tessore @ntessore.bsky.social · 02/04/2025

Separating the point made from the DESI results, I still think it’s good practice to test any such expansion against a higher-order one (like DESI effectively did with the GP). That could be as simple as a likelihood-ratio test or so.

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Nicolas Tessore @ntessore.bsky.social · 21/03/2025

Great results from DESI, but not nearly enough commentary about what phantom dark energy means in terms of GR

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Nicolas Tessore @ntessore.bsky.social · 13/03/2025

yeah, it’s an old-fashioned drain unblocker

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Nicolas Tessore @ntessore.bsky.social · 13/03/2025

aren't you supposed to add water, sugar, a few dashes of bitter, and an orange slice?

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Nicolas Tessore @ntessore.bsky.social · 09/03/2025

Fantastic little book for World Book Day from DK and Lego

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Nicolas Tessore @ntessore.bsky.social · 23/02/2025

First 2025 release of GLASS is out: github.com/glass-dev/gl... It comes with a big change that allows you to easily create FLASK-like simulations from a set of n(z) without simulating the entire lightcone. This isn’t usually the best way to go, but can sometimes be.

github.com

Release glass 2025.1 · glass-dev/glass

First 2025 release of GLASS. Release note Changelog Full list of commits

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Nicolas Tessore @ntessore.bsky.social · 20/01/2025

We’d probably just waste the money on postdocs’ livelihood instead

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Nicolas Tessore @ntessore.bsky.social · 09/01/2025

I feel like an idiot! Someone just showed there is a "web" tab for Google results that displays the plain old Google results from yesteryear!

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Nicolas Tessore @ntessore.bsky.social · 05/01/2025

BlueSky etc. are fine, but I wish we also had a dedicated space for professional discourse in Cosmology, Astrophysics, Astronomy, etc. Something like categorytheory.zulipchat.com, which seems phenomenally useful to me.

categorytheory.zulipchat.com

Public view of Category Theory | Zulip team chat

Browse the publicly accessible channels in Category Theory without logging in.

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Nicolas Tessore @ntessore.bsky.social · 09/12/2024

Is the Vatican City the country with the highest number of astronomy papers/capita?

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Nicolas Tessore @ntessore.bsky.social · 08/12/2024

That’s a shame. I’m not following social media all that much but I enjoy, for example, reading mathematical discussions over at mathstodon.xyz from time to time. I was hoping there’d be the equivalent for our field somewhere.

mathstodon.xyz

Mathstodon

A Mastodon instance for maths people. We have LaTeX rendering in the web interface!

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Nicolas Tessore @ntessore.bsky.social · 08/12/2024

Fair enough, I was hoping for science content from scientists!

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Nicolas Tessore @ntessore.bsky.social · 08/12/2024

Are there feeds with science content, instead of feeds with random content by scientists?

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Nicolas Tessore @ntessore.bsky.social · 03/12/2024

Hey @ojastro.bsky.social, do you accept "research notes" as understood by RNAAS? (short text, single figure or table, possibly no sections, etc.)

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Nicolas Tessore @ntessore.bsky.social · 03/12/2024

We need to go back to this plot style

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Nicolas Tessore @ntessore.bsky.social · 02/12/2024

Sad to see the state of Bluesky after a long hiatus. Far too much galaxies, not nearly enough cosmology.

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Nicolas Tessore @ntessore.bsky.social · 09/01/2024

PSA: Numpy is currently deprecating and planning to remove the trapz() function in v2.0, due to appear in a month or so. This sounds like utter madness to me, since it's probably one of the most common operations I use.

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Nicolas Tessore @ntessore.bsky.social · 20/11/2023

As it turns out, this mysterious undocumented 𝑀-inversion parameter is really a 𝚖𝚒𝚗𝚟𝚎𝚛𝚜𝚒𝚘𝚗 parameter.

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Nicolas Tessore @ntessore.bsky.social · 31/10/2023

I find it very interesting that the publications describing the famous Hershey fonts are fairly easy to find, but the original data files seem lost to time. I bet that it will be the same 40 years hence, and papers about code survive much longer than the codes themselves.

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Nicolas Tessore @ntessore.bsky.social · 25/10/2023

I finally had enough trying to homogenise BibTeX files from multiple authors, and started on a no-dependencies, pure Python formatter for BibTeX: pip install tidybib # requires python>=3.10 tidybib main.bib # reformats main.bib Next step: detect duplicate entries with different keys.

github.com

GitHub - ntessore/tidybib: BibTeX formatter, written in Python

BibTeX formatter, written in Python. Contribute to ntessore/tidybib development by creating an account on GitHub.

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Nicolas Tessore @ntessore.bsky.social · 13/10/2023

The macOS dictionary entry for "proposition" reads like someone talking from experience

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Reposted by Nicolas Tessore

Emily Hunt @emily.space · 07/10/2023

I just set up an automated way to send out invite codes to astro folk who request them 😁 I think I can send out about 100/day. 🔭 Donate any codes you have here: forms.gle/R35p4MRSwpk2... & please share this code request form with other astro folks: forms.gle/GggKAPv8Vcrv...

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Nicolas Tessore @ntessore.bsky.social · 21/09/2023

There seems to be broad consensus here, but I'm curious, why is it easier? (Honest question!) You cannot quickly comment out one of the settings, total number of characters to type is about the same, and black will put everything back onto a separate line.

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Nicolas Tessore @ntessore.bsky.social · 31/08/2023

Not many people seem to know about matplotlib's constrained layout mode. It makes life so much easier!

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Nicolas Tessore @ntessore.bsky.social · 16/08/2023

Be mindful of the monetary values you put down as well. We got hit with insane fees due to people not knowing the various limits for import duties

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Nicolas Tessore @ntessore.bsky.social · 01/08/2023

The caveat is that these thin, overlapping shells need an equally accurate method for computing angular matter power spectra.

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Nicolas Tessore @ntessore.bsky.social · 01/08/2023

I have just now released version 2023.7 of our cosmological simulation code GLASS. A pretty cool addition are window functions which correspond to linear and cubic spline interpolation, respectively, giving much better approximations of radial functions. glass.readthedocs.io

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Nicolas Tessore @ntessore.bsky.social · 25/07/2023

For a simple lower bound on the accuracy of angular power spectrum codes (non-Limber etc.), you can compare the sum of all tomographic C_ells of your survey and the non-tomographic C_ell.

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