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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 · 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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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 · 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 · 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 · 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

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 · 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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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 · 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 · 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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