Nicolas Tessore
@ntessore.bsky.social
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cosmology and spherical functions, “another gravitational lensing expert” – Daily Mail
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...
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Release glass 2025.2 · glass-dev/glass
Second 2025 release of GLASS. Release note Changelog Full list of commits
https://github.com/glass-dev/glass/releases/tag/v2025.2
3 months ago
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reposted by
Nicolas Tessore
The Open Journal of Astrophysics
4 months ago
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...
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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
https://doi.org/10.33232/001c.145919
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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.
4 months ago
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reposted by
Nicolas Tessore
AstroArxiv
7 months ago
Shot noise in clustering power spectra. Nicolas Tessore et. al. https://arxiv.org/abs/2507.03749
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Great results from DESI, but not nearly enough commentary about what phantom dark energy means in terms of GR
10 months ago
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Fantastic little book for World Book Day from DK and Lego
11 months ago
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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.
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Release glass 2025.1 · glass-dev/glass
First 2025 release of GLASS. Release note Changelog Full list of commits
https://github.com/glass-dev/glass/releases/tag/v2025.1
11 months ago
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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!
about 1 year ago
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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.
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Public view of Category Theory | Zulip team chat
Browse the publicly accessible channels in Category Theory without logging in.
https://categorytheory.zulipchat.com
about 1 year ago
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Is the Vatican City the country with the highest number of astronomy papers/capita?
add a skeleton here at some point
about 1 year ago
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Are there feeds with science content, instead of feeds with random content by scientists?
about 1 year ago
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Hey
@ojastro.bsky.social
, do you accept "research notes" as understood by RNAAS? (short text, single figure or table, possibly no sections, etc.)
about 1 year ago
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Sad to see the state of Bluesky after a long hiatus. Far too much galaxies, not nearly enough cosmology.
about 1 year ago
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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.
about 2 years ago
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As it turns out, this mysterious undocumented 𝑀-inversion parameter is really a 𝚖𝚒𝚗𝚟𝚎𝚛𝚜𝚒𝚘𝚗 parameter.
about 2 years ago
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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.
about 2 years ago
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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.
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GitHub - ntessore/tidybib: BibTeX formatter, written in Python
BibTeX formatter, written in Python. Contribute to ntessore/tidybib development by creating an account on GitHub.
https://github.com/ntessore/tidybib/
over 2 years ago
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reposted by
Nicolas Tessore
Emily Hunt
over 2 years ago
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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Not many people seem to know about matplotlib's constrained layout mode. It makes life so much easier!
over 2 years ago
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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.
https://glass.readthedocs.io
over 2 years ago
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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.
over 2 years ago
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