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Ciaran O'Hare

@cajohare.bsky.social
325 followers 243 following 32 posts

senior lecturer in astroparticle physics at sydney uni. cajohare.com

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Ciaran O'Hare @cajohare.bsky.social · 25/11/2025
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
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Ciaran O'Hare @cajohare.bsky.social · 16/09/2025
Really enjoyed this talk by Raphael Buosso on the cosmological constant and why "dynamical dark energy" is very unlikely youtu.be/FvRcycZAPG8?...
youtu.be
Raphael Bousso: "Why it’s a cosmological constant?"
YouTube video by Galileo Galilei Institute (GGI)
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Ciaran O'Hare @cajohare.bsky.social · 10/09/2025
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
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Ciaran O'Hare @cajohare.bsky.social · 12/08/2025
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
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Ciaran O'Hare @cajohare.bsky.social · 15/01/2025
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...
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Reposted by Ciaran O'Hare
Fun Fact Science with Kovi @funfactscience.com · 07/11/2024
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...
open.spotify.com
Bah Bah Black Hole Have You Any Mass : Guest : Ciaran O'Hare
Science, Actually Presents : The Nerd and the Scientist · Episode
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Ciaran O'Hare @cajohare.bsky.social · 13/12/2024
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
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