So we have arrived at October 31st, Hallowe’en or, in pagan terms, Samhain. This, a cross-quarter day – roughly halfway between the Autumnal Equinox and the Winter Solstice – represents the start of winter (“the dark half of the year“) in the Celtic calendar. Technically, Samhain is tomorrow, 1st November, but the Celtic practice of reckoning days from sunset to sunset makes this a moot point.
Samhain is pronounced something like “sowin”, with the “sow” as in a female pig. The h after the m denotes lenition of the consonant (which in older forms of Irish would have been denoted by a dot on top of the m) so, when followed by a broad vowel the m is pronounced like the English “w”; when followed by a slender vowel or none “mh” is pronounced “v” or in other words like the German “w” (which makes it easier to remember). The phrase Oíche Shamhna (the Eve of Samhain) is used for Hallowe’en; it contains the genitive form of Samhain.
Unfortunately I’m still struggling a bit with the after-effects of yesterday’s jab so have neither the time nor the energy for a long post today so instead, before I go for another nap, I’ll just share a a replica (from the National Museum) of an authentically carved turnip as was traditional in old times. I think it’s infinitely scarier than any of those namby-pamby pumpkins.
Just for the record, today I had my 5th Covid-19 vaccination booster. As an Old, I get prompted by the HSE to get free Covid-19 boosters and winter ‘flu jabs so I booked an appointment at a local pharmacist as I did last year. In fact I went into work this morning to say farewell to newly-doctored Aoibhinn Gallagher, and walked to the pharmacy afterwards. I didn’t have to wait long and the vaccination itself only took a matter of minutes.
That makes seven Covid-19 jabs altogether for me: the initial vaccination was in two stages, and I have since had five boosters. All but one of these have been Pfizer; the other was Moderna.
On previous occasions of this type I’ve usually managed to arrange an afternoon free afterwards in case of any adverse reactions. That was easy this time because it is Study Week at Maynooth University so there are no lectures. I did feel a bit tired after the jab, and had a short nap this afternoon. I also seem to have developed a runny nose, which may or may not be a reaction to the injection, but I don’t think it’s very serious.
Update: 24 hours on, I’m still feeling the after-effects. Hopefully, I’ll be better by the weekend.
from left to right: Dr Neil Trappe (HoD, Physics); Dr John Regan; Dr Aoibhinn Gallagher; Dr Matthew Birney; Dr Hannah O’Brennan; me; Dr Jonivar Skullerud
Yesterday I attended a conferring ceremony at Maynooth which was a very special occasion because it involved the formal award of the PhD degree to Aoibhinn Gallagher whom I supervised. Two other research students from the Department of Physics got their PhDs yesterday too; Matthew Birney and Hannah O’Brennan. Matthew (ESO Garching) and Aoibhinn (Bielefeld) both now have postdoctoral positions in Germany, incidentally.
These events are not actually called Graduation Ceremonies here in Ireland but Conferring Ceremonies. I was impressed that the local suppliers of academic dress, Phelan Conan were able to supply the correct 1989 vintage DPhil gown from Sussex University as opposed to the less interesting modern one. I would have worn it for the picture above, but by the time we found Hannah to take the photo I had already returned it to the supplier. Here are two more with myself in the gown and mortarboard:
left to right: Dr Emma Whelan; Dr Matthew Birney; Dr Aoibhinn Gallagher; meMyself and Aoibhinn
You can see a picture of me wearing the same sort of gown in Brighton back in 1989, when I was a skinny young queen, here. I’ll add more pictures from yesterday if and when I get them.
As well as the PhDs we also saw the entire class of our MSc in Theoretical Physics and Mathematics get their degrees. I haven’t got any photographs of them, but will add any that I find. Here is a photograph of them outside the TSI building, courtesy of Jonivar Skullerud.
After the ceremony, those who got their degrees went for dinner with their respective parents, siblings and others who had come to attend the ceremony. We did meet up later on, however, in a local pub for a drink or several. In among all that I didn’t have time to write a post, bringing to an end a blogging streak of 109 days.
Graduation ceremonies are funny things. With all their costumes and weird traditions, they even seem a bit absurd. On the other hand, even in these modern times, we live with all kinds of rituals and I don’t see why we shouldn’t celebrate academic achievement in this way.
I like graduation ceremonies, actually. As each person walks across to be presented with their scroll you realize that every one of them has a unique story to tell and a whole universe of possibilities in front of them. How their lives will unfold no-one can tell, but it’s a privilege to be there for one important milestone on their journey, even those from other departments with whom you have had no contact at all.
I always find these ceremonies bittersweet occasions, though. There’s joy and celebration, of course, but these are tempered by the realization that many of the young people whom you’ve seen around long enough to grow accustomed to their faces, will disappear into the big wide world, in some cases never to be seen again. Although everyone is rightly proud of the achievement – either their own in the case of the graduands or that of others in the case of the guests – there’s also a bit of sadness to go with the goodbyes. It always seems that as a lecturer you are only just getting to know students by the time they graduate, but that’s enough to miss them when they go.
Anyway, all this is a roundabout way of saying congratulations once more to everyone who graduated yesterday, including Matthew, Hannah and Aoibhinn, and I wish you all the very best for the future!
Every now and again I look at the latest particle physics literature on arXiv to see what’s going on. The other day I saw a preprint there which gives a review of the latest results on supersymmetry from the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider at CERN. I should explain that, in experimental particle physics, “compact” means “fucking enormous”.
Anyway, the abstract of the paper reads:
The Run 2 data-taking period of the CERN Large Hadron Collider during years 2015-2018 provided about 140 fb-1 of proton-proton collisions at 13 TeV, offering an unprecedented opportunity to explore supersymmetry (SUSY) across a wide range of experimental signatures. CMS responded with a broad and diverse search program, carrying out dozens of analyses that probed a multitude of final states and systematically explored different regions of the SUSY parameter space. No significant deviations from standard model predictions were observed, and the results were used for constraining the SUSY landscape. In this review, I provide a comprehensive account of the CMS Run 2 SUSY program, covering its strategy, targeted models, and analysis methods. I then present the full set of searches and conclude with their combined impact through simplified model and phenomenological MSSM interpretations.
arXiv:2510.17971
Here is one of the pretty pictures from the review. This one shows the constraints on the masses of any supersymmetric counterparts of the electroweak gauge bosons.
To summarize the evidence for supersymmetry from CMS, there is none, nil, nought, nada, zero, zilch, zip, sweet Fanny Adams, bugger-all and diddly-squat. I hope this clarifies the situation.
It’s Sunday 26th October 2025 and in the early hours of this morning the clocks went back, bidding goodbye to Summer Time. You can tell I’m an oldie because I have quite a lot of time-keeping devices around the house that need to be set by hand. My computer updates itself, of course, but I’m not sure if WordPress does. I’ll find out when I publish this post!
I’ve written before about the silly business of moving the clocks backwards and forwards (e.g. here) so I won’t repeat it all again. I will mention, however, that some time ago, before the Covid-19 Pandemic, the European Parliament approved a directive that would abolish `Daylight Saving Time’. Unfortunately that plan was ‘paused’ although Spain is apparently going to try to get it going again. I’ve long felt that the annual ritual of putting the clocks forward in the Spring and back again in the Autumn was a waste of time effort, so I’ll be glad if and when this silly practice is terminated. It would be far better in my view to stick with a single Mean Time throughout the year. I’m disappointed that this hasn’t already happened.
Anyway, talking of time, we have now completed five weeks of teaching in Semester 1 at Maynooth University. Tomorrow (Monday 27th October) is the October Bank Holiday and next week is Study Week so there are no lectures or tutorials. We do, however, have conferring (graduation) ceremonies including one that involves my recently-completed PhD student. Looking at my diary I notice also that I also have an appointment for my flu jab and Covid-19 booster, another sign that I’m an old codger.
Normally Study Break comes halfway through the 12-week teaching term but this year it splits 5-7. It did so last year too, actually. I am not unhappy to have an earlier break as I’m very tired, but I am conscious that this is going to make for a longer run-in to the Christmas holiday. We are supposed to teach up until Friday 19th December, but I don’t have any lectures on that day.
I’m not sure how much studying the students do during Study Week, but it’s not a holiday for academic staff even though there is no undergraduate teaching. Among other things we have examinations to write for the January examination period, which must be checked and printed well in advance. The deadline for these is November 3rd, so I have all week but I am planning to spend next weekend elsewhere so I need to get them done beforehand.
To nobody’s surprise, the winner of the Irish Presidential Election is Catherine Connolly. The official declaration of the results from the 43 constituencies of the Republic of Ireland was announced in Dublin Castle shortly after 7pm this evening, with an emphatic margin of victory for the Galway West TD. The total number of votes cast was 1,656,436, a turnout of just 45.8% (though that was a little higher than in 2018). The number of Invalid votes was 213,738.
Catherine Connolly was comfortably elected on the first count with 914,143 votes, more than half the number of valid votes. Heather Humphreys had 424,987 votes and Jim Gavin (who withdrew at the start) got 103,568 votes.
It is worth pointing out that the share of the vote (63%) and the number of votes cast in her favour are the largest for any President in the Republic’s history.
The large number of spoilt votes (13%) is probably attributable to the narrowness of the field, but those arguing that the nomination process should be changed need to remember that Article 12 of the Constitution of the Republic of Ireland stipulates how the process should occur so any change will need a referendum. People of course are entitled to spoil their paper if they wish, but I did read that one voter smearing their ballot paper with faeces, which is both disgusting and inexcusable.
I’ll repeat my view that the decision to hold the ballot on the Friday before a Bank Holiday long weekend probably contributed to the low turnout, as many people would have been planning to go away. I said the same last time, in 2018. The 2011 Presidential Election was held on a Thursday, which I think is a much better day to have an election.
Anyway, heartiest congratulations to Catherine Connolly, who won by a country mile, and will shortly become the next Uachtarán na hÉireann, the 10th person to hold that title.
It may be a Bank Holiday weekend here in Ireland, but it’s still time for the usual Saturday update of the week’s new papers at the Open Journal of Astrophysics (although a bit later in the day than usual). Since the last update we have published another five papers, which brings the number in Volume 8 (2025) up to 161, and the total so far published by OJAp up to 396.
This week’s update is rather unusual because there are four papers in a series (or, more precisely, mathematically speaking, a sequence) all published on the same day (Wednesday October 22nd 2025), in the same folder (Cosmology and NonGalactic Astrophysics), with the same first author (Dhayaa Anbajagane of the University of Chicago), with long author lists and many co-authors in common. These papers all relate to the DECADE cosmic shear project. Instead of doing them one by one, therefore, I’ve decided to put all four overlays together and provide links to all the papers afterwards. As I’m trying to encourage people to follow our feed on the Fediverse via Mastodon (where I announce papers as they are published, including the all-important DOI), I’ll include links to each announcement there too.
New Publication at the Open Journal of Astrophysics: "The DECADE cosmic shear project I: A new weak lensing shape catalog of 107 million galaxies" by Dhayaa Anbajagane (University of Chicago, USA) et al. (54 authors)
New Publication at the Open Journal of Astrophysics: "The DECADE cosmic shear project II: photometric redshift calibration of the source galaxy sample" by Dhayaa Anbajagane (University of Chicago, USA) et al. (53 authors)
New Publication at the Open Journal of Astrophysics: "The DECADE cosmic shear project III: validation of analysis pipeline using spatially inhomogeneous data" by Dhayaa Anbajagane (University of Chicago, USA) et al. (53 authors)
New Publication at the Open Journal of Astrophysics: "The DECADE cosmic shear project IV: cosmological constraints from 107 million galaxies across 5,400 deg^2 of the sky" by Dhayaa Anbajagane (University of Chicago, USA) et al. (75 authors)
The fifth and final paper for this week is “Clustering of DESI galaxies split by thermal Sunyaev-Zeldovich effect” by Michael Rashkovetskyi of the Harvard-Smithsonian Center for Astrophysics, or CfA for short, and 48 others. This one was published on Wednesday 23rd October in the folder Cosmology and NonGalactic Astrophysics. This paper explores how the clustering properties of galaxies mapped by the Dark energy Spectroscopic Instrument (DESI) relate to the local thermal Sunyaev-Zeldovich emission mapped by the Atacama Cosmology Telescope (ACT). The overlay is here:
The officially accepted version can be found on arXiv here, and the fediverse announcement is here:
New Publication at the Open Journal of Astrophysics: "Clustering of DESI galaxies split by thermal Sunyaev-Zeldovich effect" by Michael Rashkovetskyi (Cfa Harvard-Smithsonian, USA) et al. (49 authors)
So we come to it at last. After weeks of campaigning, today’s the day we get to cast our votes in the election of a new President of the Republic of Ireland. All the polls suggest that the winner will be Catherine Connolly, and indeed the only posters I have seen around my neighbourhood are for her.
The only message I got through the door was for her too:
I shall shortly be heading to the Presentation Girls National School in Maynooth, which is my polling station. I’ll be voting for Catherine Connolly, in case you want to know. She is clearly the better candidate; my opinion of Heather Humphreys went down every time I heard her speak. Anyway, we should know the result by tomorrow evening when we’ll find out whether the opinion polls are right.
Today also happens to be the last day before our study break in Maynooth University and the start of a long weekend. I did my last teaching session of the week yesterday, actually. That’s why I didn’t have to get up early to vote before work. It also means have research on the agenda for today. Monday 27th October is a Bank Holiday and there are no lectures for the rest of the week. There are conferring ceremonies, though, including one for my recently-completed PhD student on Wednesday.
Update: I voted as planned. The polling station was fairly busy.
It’s been a cool autumn day so this seems appropriate. It’s from the classic 1958 albumSomethin’ Else which was Cannonball Adderley’s first as a leader, and one of Miles Davis’s last as a sideman (also a rare recording for Miles on the Blue Note label). Adderley went on to play alto sax with the great Miles Davis sextet that recorded Kind of Blue, and Miles obviously influenced this album enormously, but the rhythm section here is different from that band’s – Art Blakey on drums, Hank Jones on piano, and Sam Jones on bass. Miles Davis was also responsible for this arrangement of the standard Autumn Leaves, which he based on a version by Ahmad Jamal.
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In the Dark 