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Ciaran O'Hare

@cajohare.bsky.social

senior lecturer in astroparticle physics at sydney uni. https://cajohare.com/

31 Posts320 Follower 243 Folgt

Ciaran O'Hare @cajohare.bsky.social · 8mo ago

The break down of a recent Australian Research Council grant scheme by field of research. How kind of them to allow a few non-engineering grants this year... And by the way: the ARC's Discovery program of grants is, according to them, intended to "fund fundamental, ‘blue sky’ research".

breakdown of ARC DECRA awards by field of research

ARC Tracker@arc-tracker.bsky.social · 8mo ago

🚨 #DECRA #DE26 announcement: ❗️Outcomes announced publicly for Discovery Early Career Researcher Award 2026❗️ See ARC's RMS for list ➡️ https://rms.arc.gov.au/RMS/Report/Download/Report/a3f6be6e-33f7-4fb5-98a6-7526aaa184cf/285 /bot

Ciaran O'Hare @cajohare.bsky.social · 11mo ago

Really enjoyed this talk by Raphael Buosso on the cosmological constant and why "dynamical dark energy" is very unlikely youtu.be/FvRcycZAPG8?...

Raphael Bousso: "Why it’s a cosmological constant?"

YouTube video by Galileo Galilei Institute (GGI)

youtu.be

Ciaran O'Hare @cajohare.bsky.social · 11mo ago

Are stellar-mass primordial black holes ruled out as dark matter? Hawkins and Garcia-Bellido launch a barrage of criticisms at the OGLE microlensing survey analysis. Some of the language used in this paper makes me wince... arxiv.org/abs/2509.05400

Exerpt from paper: This paper was prompted by a recent article in Nature (Mróz et al. 2024a), and an acompanying paper in Astrophysical Journal Supplement (Mróz et al. 2024b) which stated in strongly worded terms
that there are no massive black holes in the Milky Way halo. The
evidence to support this claim by the OGLE collaboration was at best
flimsy, and under normal circumstances could have been left to the
judgement of others. However, it soon became clear to us that in the absence of any critique of the arguments presented, the conclusions
of the paper were widely accepted. It is not a pleasant task to expose
the weakness of a publication from a well respected group such as the
OGLE collaboration, but the subject is of great topical importance
and we feel it is important that both sides of the argument are heard.

Title of paper: A critical analysis of the recent OGLE limits on stellar mass primordial black holes in the halo of the Milky Way

Ciaran O'Hare @cajohare.bsky.social · 12mo ago

For those in Sydney on Saturday afternoon, I will be speaking all about cosmology and the Big Bang at this event at the very nice Chau Chak Wing Museum

Sydney Mathematical Research Institute (SMRI)@sydmathinst.bsky.social · last yr.

Science at the Museum is happening at the Chau Chak Wing Museum on Saturday 16th and Sunday 17th August! Join us as we team up again with the museum for a program loaded with activities for the whole family! #MathSky #NationalScienceWeek mathematical-research-institute.sydney.edu.au/event/scienc...

Ciaran O'Hare @cajohare.bsky.social · 2y ago

2024 was yet another exhausting year keeping track of updates on our quest to find the axions. I have been trying my best to collect the exponentially growing literature on my GitHub AxionLimits: github.com/cajohare/Axi...

Fun Fact Science with Kovi @funfactscience.com · 2y ago

In our latest episode we chat with Ciaran O'Hare (University of Sydney) about #darkmatter, quarks, and the Venn diagram of #astronomy and particle #physics. If you watch closely you can see the exact moment @scienceactually.bsky.social mind gets blow open.spotify.com/episode/7dDO...

Bah Bah Black Hole Have You Any Mass : Guest : Ciaran O'Hare

Science, Actually Presents : The Nerd and the Scientist · Episode

open.spotify.com

Ciaran O'Hare @cajohare.bsky.social · 2y ago

I feel like I need to break the ice here somehow... I suppose I will just announce that I will be posting my annual AxionLimits yearly round-up on this account soon, so stay tuned i guess