Archive for July, 2025

How to Hold your Hurley

Posted in Cricket, GAA, Maynooth with tags , , , , , on July 6, 2025 by telescoper

This is a big weekend for fans of hurling, as we have reached the semi-final stage of the All Ireland Senior Hurling Championship. Yesterday Cork trounced Dublin by 7-26 to 2-21. I’ve never seen such a high scoring game at the top level, nor a margin as large as 20 points (a goal is worth 3 points)! Though not expected by many to progress, Dublin had deservedly beaten Limerick in the quarter-finals but they were never in the game yesterday.

The other semi-final takes place this afternoon at 4pm, and is between Kilkenny and Tipperary. Which of these will meet Cork in the Final? We’ll soon find out!

Update: it was another high scoring match, finishing Kilkenny 0-30 to Tipperary’s 4-20, so Tipperary won by 2 points (with a goal in the last minute). The All Ireland Final will therefore be between Cork and Tipperary.

Both semi-finals are held at Croke Park, as is the final. Many supporters come through Maynooth on their way to these matches, as we’re on the train line that goes into Dublin Connolly via Drumcondra (the nearest station to Croke Park). There is an arrangement by which supporters can park their cars at the GAA ground in Maynooth and take the train, as there is no chance of parking near Croke Park.

Yesterday evening I needed to do a quick trip to the shops and ran into a crowd of returning Cork supporters who had just arrived by train. Most fans were in very good humour (unsurprisingly) but a few were very much the worse for drink: one young lad had passed out on the footpath and concerned pedestrians called an ambulance; over the road at the bus terminus Gardaí were dealing with a drunk and aggressive person; and in Supervalu a hopelessly inebriated bloke staggered into the off-licence part to get more booze but ended up falling over and dropping the cans he had picked up, with one bursting and making a mess all over the floor.

Anyway, none of this is to do with the intended subject of this post. Cork’s victory yesterday reminded me of a little bit of hurling information that I found interesting, concerning the way to hold the hurley. Having been brought up on a different bat-and-ball game (cricket), I was surprised to learn that in hurling you are supposed to hold the bat the wrong way round! What I mean by that is that in cricket the batter holds the bat with the dominant hand at the bottom of the handle near the blade and the other hand at the top. For illustration, here’s a forward defensive shot played by a right-hander:

For illustration, on the left, there’s a forward defensive shot played by a right-hander. You can see the left hand at the top of the handle and the right hand near the bottom. Shots like this are played predominatly with the bat moving in a vertical plane, guided by the left hand with the right hand guiding the direction. A hook or pull shot is played with the same grip but swinging the bat across the body from right to left with more bottom hand.

When I was at school I tried batting left-handed in the nets. It was quite interesting. I found I could play defensive shots equally well that way as with my usual right-handed stance, but I couldn’t play attacking shots very well at all.

It’s the same arrangement in baseball (or rounders, as we call it on this side of the Atlantic). The batter will hold the bat with their weaker hand nearer the end of the handle, i.e. towards the thin end.

On the other hand (!), a hurler holds the hurley the other way round. On the right you can see a hurler at the ready position, with his right hand at the top of the handle and the left hand near the blade. When striking the sliotar (ball), the hands are moved closer together. Holding the end of the hurley in the dominant hand means that more strength can be applied when reaching away from the body with one hand, something that isn’t really done in cricket. The typical long-range strike of the sliotar is rather like a hook shot in cricket, except it’s played the opposite way across the body.

Here’s a video:

This seems very unnatural if you have been brought up to use the opposite basic grip, which explains why so many struggled even to hit the sliotar at the practice at the EAS Social Dinner in Cork a couple of weeks ago. In Ireland, however, kids learn to play hurling when they’re still in kindergarten so this is instilled at a very early age.

Weekly Update from the Open Journal of Astrophysics: 05/07/2025

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , , , , , , , , , , , on July 5, 2025 by telescoper

It’s Saturday so, once again, it’s time for the weekly update of papers published at the Open Journal of Astrophysics. Since the last update we have published three new papers, which brings the number in Volume 8 (2025) up to 85, and the total so far published by OJAp  up to 320.

The three papers published this week, with their overlays, are as follows. You can click on the images of the overlays to make them larger should you wish to do so.

The first paper to report is “Stellar reddening map from DESI imaging and spectroscopy” by Rongpu Zhou (Lawrence Berkeley National Laboratory, USA) and an international case of 56 others too numerous to mention individually. This paper was published on 1st July 2025 in the folder marked Astrophysics of Galaxies. It describes maps of stellar reddening by Galactic dust inferred from observations obtained using the Dark Energy Spectroscopic Instrument, and a comparison with previous such maps. The overlay is here:

You can find the final, accepted, version on arXiv here.

Next one up is “On inertial forces (indirect terms) in problems with a central body” by Aurélien Crida (Université Côte d’Azur, France) and 17 others – again too numerous to be listed individually – based in France, Italy, Germany, Mexico and the USA. This paper discusses the indirect terms that arise the Newtonian dynamics of multi-body systems dominated by a central massive body, upon which other bodies exert a gravitational pull, when the massive body is treated as the origin of the coordinate system. This one, also published on July 1st 2025, is in the folder marked Earth and Planetary Astrophysics.

The overlay is here:

You can find the officially accepted version on arXiv here.

The last paper of this batch is “Stellar ejection velocities from the binary supernova scenario: A comparison across population synthesis codes” by Tom Wagg (U. Washington, USA), David D. Hendriks (U. Surrey, UK), Mathieu Renzo (U. Arizona, USA) and Katelyn Breivik (Carnegie Mellon U., USA). It was published on July 2nd 2025 in the folder Solar and Stellar Astrophysics and it presents comparison of the ejection velocities of stars ejected from binary systems by supernova explosions predicted in three different population synthesis codes.

The overlay is here:

You can read the final accepted version on arXiv here.

That’s all the papers for this week. I’ll post another update next weekend.

40 Years a Graduate

Posted in Biographical, Education, Maynooth with tags , on July 4, 2025 by telescoper

The summer examinations at Maynooth being over and the finalists having received their degree results I was reminded that I’d missed the anniversary of my own graduation. The main reason for that is that I couldn’t remember the date. I thought it was in July, actually, but rummaging through my files reminded me that it was on Saturday 22nd June 1985. Maynooth graduands will have to wait until September at the earliest for their conferring ceremony.

The degree certificate, incidentally, is not at all fancy. The only thing that surprised me about it was that it’s not in Latin!

The Stiff Ticket for my Degree

The one I got when I collected my DPhil from Sussex University is far more elaborate. It’s also worth mentioning that although I did Natural Sciences (specialising in Theoretical Physics), the degree I got was Bachelor of Arts.

I don’t remember much about the Cambridge graduation, perhaps because the previous evening (Friday 21st June) we were plied with alcohol at the MacFarlarne-Grieve Dinner (a special event for graduands), then finished up in The Pickerel, the closest pub to the College. Our ceremony started at 9.15am and I wasn’t the only person graduating with a hangover.

The whole ceremony was dpme in Latin (or was when I graduated) and involved each graduand holding a finger held out by their College’s Praelector and then kneeling down in front of the presiding dignitary, i.e. either the Vice-Chancellor or Deputy Vice-Chancellor. I can’t remember which.  The magic formula that turns a graduand into a graduate is:

Auctoritate mihi commissa admitto te ad gradum Baccalaurei in Artibus, in nomine Patris et Filii at Spiritus Sanctii

Other than that, and the fact that the graduands had to walk to the Senate House from their College through the streets of Cambridge,  I don’t remember much about the actual ceremony.

After the ceremony we returned to Magdalene College for a garden party. I found this quite stressful, because my parents had divorced some years before and my Mum had re-married. My Dad wouldn’t speak to her or her second husband. At the garden party, the two parts of my family occupied positions at opposite corners of the lawn and I scuttled between them trying to keep everyone happy. It was like that for the rest of the day and I was glad when it was all over.

Anyway, the following October I started as a research student at the University of Sussex doing a Doctorate in Philosophy. I finished my thesis in 1988. Those three years were hard work but, on the whole, very enjoyable. I have a similar length of time in front of me before I retire. By the end I’ll have had 40 years in higher education (29 in the UK and 11 in Ireland). Hopefully, by then I’ll have figured out what to do when I leave University.

A Trip to Trim

Posted in Biographical, Maynooth with tags , , , on July 3, 2025 by telescoper

This morning I took an impromptu trip to Trim, which is situated in the Boyne Valley in County Meath. There has been a small astrophysics workshop going on there this week, attended by some people I know including a couple of old friends from Nottingham, Frazer and Meghan. Trim is less than 30km from Maynooth as the crow flies. Unfortunately I couldn’t find a crow willing to offer me a lift, public transport from Maynooth to Trim is difficult, and I don’t drive, so it wasn’t easy to arrange to meet up. Fortunately this morning one of our postdocs was driving up for the morning session of the meeting so I cadged a lift and and stayed until lunch before getting a lift back to Maynooth.

It was a nice trip. An added bonus was that the workshop venue was just a few metres away from the historic Trim Castle, which was built in the early 13th Century. We had time for a quick walk around before leaving to return to Maynooth.

As you can see, it’s a standard model Norman castle. The Keep, though not entirely intact is pretty well preserved; there’s certainly a lot more left than in the case of Maynooth castle. Quite a lot of the curtain wall and the gates have survived quite well too. In order to get inside the Keep (and climb to the top) you have to take an official tour, but we didn’t have time for that.

A Stiff Ticket

Posted in Biographical with tags , , on July 2, 2025 by telescoper

I got this – an example of what my Dad used to call a “Stiff Ticket” – via email today.

I suppose I’m supposed to show it to my superiors to prove that I wasn’t just on holiday in Cork last week. I think I’ll print it out and put in on the wall of my office, alongside the certificate for my Cycling Proficiency Award (Bronze).

MSc in Theoretical Physics & Mathematics at Maynooth

Posted in Education, Maynooth, The Universe and Stuff with tags , , on July 1, 2025 by telescoper

Today is Consultation Day here at Maynooth University and, in the course of being consulted, I was reminded that this period, being immediately after undergraduate final results are released to students, is a potentially a good time to advertise our local postgraduate course to prospective applicants.

I therefore decided o use the medium of this blog to advertise the fact that the MSc in Theoretical Physics & Mathematics at Maynooth University is open to applications for entry in September 2025.

This postgraduate course is run jointly between the Departments of Physics and Mathematics & Statistics, with each contributing about half the material. The duration is one calendar year (full-time) or two years (part-time) and consists of 90 credits in the European Credit Transfer System (ECTS). This is split into 60 credits of taught material (split roughly 50-50 between Theoretical Physics and Mathematics) and a research project of 30 credits, supervised by a member of staff in a relevant area from either Department.

This course is a kind of follow-up to the existing undergraduate BSc Theoretical Physics & Mathematics at Maynooth, also run jointly. We think the postgraduate course will appeal to many of the students on that programme who wish to continue their education to postgraduate level, though applications are very welcome from suitably qualified candidates who did their first degree elsewhere.

You can register your interest by scanning the QR code above or, if you prefer, simply following the link here. You can apply directly to the postgraduate application portal here.

The Mystery Mushroom

Posted in Maynooth with tags , , , , on July 1, 2025 by telescoper

I saw this on my way into work this morning. I wonder if anyone can identify it? I don’t know fungi.

My PictureThis app could only identify it as some form of Agaricus, i.e. one of the Agaricaceae. I know it has a fly on it, but that doesn’t mean it is Fly Agaricbut it has also been suggested to me that it might be Amanita Strobiliformis. I’m not convinced by either of these. Does anyone have any suggestions?

Update: a day later, it has evolved!

It’s now starting to look very much like it is indeed Macrolepiota Procera (the Parasol Mushroom), and it is now opening its parasol. I expect tomorrow it will be even flatter.

Update: it is indeed looking flatter, but not in the way I imagined. Somebody squished it.