"The evidence for dynamical dark energy relies too much on DESI's BAO, which is just one data set... " *Evidence for dynamical dark energy now seen with Dark Energy Survey BAO too* youtu.be/ukMQgHj6NMI

Can gravitational waves get gravitationally lensed? Yes! Have we observed any such events? Maybe!?😮😃 youtu.be/ZGqOpDTL8k4

Want to know how to get at the non-linear cosmological scales to test modified gravity, using future large scale structure observations? Cosmology Talks has your back: youtu.be/nIdCpcObSVU

Fantastic time discussing whether the latest blockbuster cosmology results really do show that Dark Energy is evolving! Brilliant explanations from @clairelamman.bsky.social , @tamarastro.bsky.social and @justshaun.bsky.social Check it out! Full talk: youtu.be/reNicLW2vpY?... 🧪⚛️

Unfortunately it was pretty cloud during #Sunset this year at the South Pole, but our winterover Sim managed to catch this picture just before the weather got bad, with the moon over SPT! #southpole #Antarctica

🥳 It's paper day for the completed #ESO Kilo-Degree Survey. We end our journey with a consistent picture of #cosmology 😲 I've been co-leading KiDS for 12yrs & I'm so proud of what the team's achieved. If you're at the #Euclid meet, go to Angus Wright's talk @10am today!🔭 ℹ️: arxiv.org/pdf/2503.19441

What if I told you there is no S8 tension? youtu.be/PIQKe-tW1xQ

Rather appropriately, given this proliferation of "from Home" events, the next one to announce is: Multiverse from Home! I suspect discussion won't be hard to come by in this one 😅. multiverse.cosmodiscussion.com

Another "from Home" conference has launched (complete with the *perfect* banner image)... *Tabletop Scale Cosmology* Register now to discuss, and hear about, how you don't need giant telescopes and colliders to learn about the cosmos! tabletop.cosmodiscussion.com

A nice blog post by Gillian Beltz-Mohrmann about the DESI "unblinding" event last year, the excitement and the reactions: www.desi.lbl.gov/2025/03/19/a...

DESI's DR2 BAO results are out!! TL;DR... 1/n @desisurvey.bsky.social

🔊 New BAO analysis from the 3-year observations (DR2). Long story short, as follows. 1. DESI alone is consistent with LCDM. 👉 Boring 2. DESI and Planck have a 2.3 discrepancy in Ωm-H0rd plane. 👉Interesting.

I find this four parameter binned w(z) plot from DESI tantalising... the preference for w0,wa isn't coming from one isolated redshift.

No more new Cosmology Talks *today*, I promise!

JUST RELEASED: DESI DR1 & BAO RESULTS FROM DR2🌌

This is starting to look believable (to me at least 😅) *Something* is certainly going on... Great work @desisurvey.bsky.social! youtu.be/YiRaDtslycE

Can't get enough of @ec-euclid.bsky.social? Here are three "key science areas" the consortium identified from the results today and wanted to talk more about: - Active Galactic Nuclei - Galaxy Morphology - Strong Lensing youtu.be/YGqaxDH00Yw

For an explainer on #Euclid's background and what's in the Q1 data release, here's a conversation between Shaun Hotchkiss (@justshaun.bsky.social), Guada Canas-Herrera (gcanasherrera.com) from @esa.int, and our Herve Aussel (@herveaussel.bsky.social). www.youtube.com/watch?v=DVlK... #space 🔭

With today’s #Q1Release, we get a preview of #ESAEuclid’s three Deep Fields: North, South and Fornax. 🤩 The location of the Deep Fields can be seen as the yellow patches on this all-sky view of ESA Gaia’s star map from its second data release in 2018, and ESA Planck’s dust map from 2014. (1/3)

27 @eucliduk.bsky.social papers too many to digest? Cosmology Talks has your back... (more to come later today too!) youtu.be/DVlKqFrvhRY

🚨 BIG NEWS ALERT! 🚨 We’re just 24 HOURS AWAY from a MAJOR DESI release! 🌉🔭 Tomorrow at 3 PM PT, DESI is unveiling DR1, our first official Data Release—the largest dataset of its kind, packed with information on 18.7 million galaxies, quasars, and stars! But that’s not all…

Some further context: cosmologists were anxiously awaiting updates on the Hubble tension. These results mostly close the window for something unexpected to have happened at early times that affects our estimates of the expansion rate of the Universe. 🧪

Although #ACT DR6s headline is that LCDM is still king, they do find a 2.5 sigma of an unexplained polarization angle (aka cosmic birefringence)! I am amazed that people are not more excited by this! Their beta = 0.20 \pm 0.08 is very consistent with our Planck+WMAP results! arxiv.org/abs/2205.13962

"DESI's latest results, which will be revealed on March 19" 😲

Exciting times in cosmology... it's certainly curious that any combination of two probes from CMB, BAO and Supernovae, seems to favour evolving dark energy. With all three combined it's very strong, but it's still there with any two And now, with these DES results, one doesn't even need DESI's BAO.

(This is not a formal announcement but...) Registration for @cosmofromhome this year is technically open (cosmologyfromhome.com/registration/) Bonus! If you register now you get to suggest plenary speakers/topics for us to invite😃. Formal announcements will come soon-ish O(weeks)...

The publicly available talks from Early Universe from Home are all now available here: www.youtube.com/watch?v=K2Cr...

Early Universe from Home's live discussions are starting in about five hours. There are many wonderful talks already being watched and discussed asynchronously. You can satiate your fear of missing out by registering here... earlyuniverse.cosmodiscussion.com/registration/

Registration for *Early Universe from Home 2025* is now open! (running 25-28 Feb) It will be the best place to learn about and discuss... - correlators - phase transitions - topological defects - primordial black holes - and other early structures. earlyuniverse.cosmodiscussion.com

If you need a Christmas-iish Cosmology fix, all the (publicly available) talks from Parity Violation from Home are now live!

We are excited to present the new power spectrum Full-Shape results on DESI DR1 data @desisurvey. Check all the new papers at data.desi.lbl.gov/doc/papers/. A thread🧵👇

Trying to digest the army of DESI papers on the arXiv today? Cosmology Talks has your back! youtu.be/-2mlU-YzEbw

The talks have been released, asynchronous discussion is underway, and the live discussions will start on Tuesday. You can sign up to watch the talks and discussions, until the event ends on Friday: parity.cosmodiscussion.com/registration/ Some random expected highlights...

The latest Cosmology Talk! Daniele Sorini updating us on how many stars would form over a universe's history with different values of Λ. There's the usual cosmological upper limit on Λ, but he also sees a *lower* limit where smaller Λ leads to fewer stars because of *astrophysics*!! Whaat?!

Is parity violated on cosmological scales in the universe? I don't know, but I do know where to go to find the latest expert opinions on the topic! Parity Violation from Home: parity.cosmodiscussion.com (The talk submission deadline is *technically* this Friday!!!)

What is this "JAGB" distance method that everyone is suddenly talking about? Look no further, Cosmology Talks has what you want... The latest talk, featuring JAGB expert, and lead author of the recent CCHP paper on the method, Abigail Lee youtu.be/mpSsmyInrEA

Timestamp links to key parts of this CCHP Cosmology Talk are now available - they're in the Comments section below the Description.

Want to hear about the recent Chicago-Carnegie Hubble Program (CCHP) results in the authors' own words? Here you go! (The latest Cosmology Talk featuring Wendy Freedman and Barry Madore) youtu.be/OkGUoKukwk8

My first paper is up on arXiv as of a week ago!!! We used the ~1500 Type Ia supernovae from the Dark Energy Survey to measure time dilation from the expansion of the Universe 🔭 arxiv.org/abs/2406.05050 1/4

There are many excellent Cosmology Talks out this week on the Dark Energy Supernovae data set and assoc cosmo results It's truly awesome new data, with 5x more SN at high redshift than other surveys combined (And hints of a non-ΛCDM expansion!) Video 1, introducing the data and key cosmo results:

The Dark Energy Survey has had a splash of supernova papers this week; a whole 6 papers on the same day! For a bunch of these, we have explainer videos with Cosmology Talks coming out each day. Here's the first one for the key paper with @tamarastro.bsky.social 🔭: www.youtube.com/watch?v=y9oc...

Want to watch the first Cosmology Talk that was delayed because of a patent application? Here you go... www.youtube.com/watch?v=1XAb...

If you have the time for it, here is a long video of my colleague Andreu Font-Ribera and me discussing the DESI results at a reasonably technical level in conversation with @justshaun.bsky.social for Cosmology Talks: youtu.be/9DsMphPfrjI

Maybe the observed parity violation signal in the large scale structure isn't systematics *or* new physics, but just not-fully-understood old physics? arxiv.org/abs/2402.16478

Want to come to an innovative and *good* online conference about Neutrinos at the interface of cosmology and particle physics? Neutrinos from Home is what you're looking for! Registration open... (tell your friends!) neutrinos.cosmodiscussion.com

2. In the latest Cosmology Talk we summarize the IA Guide and have a nice discussion with @justshaun about IA and modern surveys https://youtu.be/BlibRW4XpR8?si=S3YAMG3_ZqbmYtjF

The latest Cosmology Talk is a guide to Intrinsic Alignments. (IA are the tendency for galaxies near to each other to have aligned shapes & spins, due to their local potential) The speakers wrote a very nice written guide & now there is a video version! youtu.be/BlibRW4XpR8

Attn cosmologists and cosmo adjacent researchers! If you want to help make online conferences better (and/or just love Cosmology from Home) you should check out and sign up for this year's CosmoConβ... cosmologyfromhome.com/cosmoconbeta... (if you have any questions, feel free to ask!)

What is better than a 2.5σ tension with no working explanation? . . . . A 4.9σ tension with three working explanations! In this Cosmology Talk from December, Keir Rogers & Vivian Poulin talk about a tension in ΛCDM between Lyman Alpha data and Planck CMB. youtu.be/_cueUDEf6n4?...

Hello Cosmology World... What interesting observational and theoretical results should we anticipate in 2024? ... I know of: - ACT DR6 primary CMB - DESI's first cosmology results - BICEP measurement/non-measurement of birefringence