Request to Iarnród Éireann to move from X

Posted in Uncategorized with tags , , , on January 28, 2026 by telescoper

I’ve posted a number of items recently (e.g. here) about why public institutions in Ireland (and anywhere else, for that matter) should not be using X. I noticed today a message on BlueSky containing the following clear and compelling letter from a number of commuter organizations to Irish Rail (Iarnród Éireann), which can be found here but which I’m taking the liberty of sharing in full here to amplify.

–o–

We are writing as rail and commuter advocacy groups across Ireland, to request that Iarnród Éireann move its real-time service updates regarding cancellations and delays from the social media platform X (formerly Twitter) to your own website and official channels.

Currently, passengers seeking up-to-date information about service disruptions must have an active X account to view these critical updates. This creates several significant problems:

Accessibility Concerns: Requiring passengers to maintain an account on a third-party social media platform to access essential public transport information creates an unnecessary barrier. Many passengers, particularly elderly travellers or those who choose not to use social media, are effectively excluded from receiving timely service updates.

Platform Concerns: Recent controversies surrounding X, including serious issues with child safety and content moderation failures involving Grok AI, make it an increasingly inappropriate platform for a state-owned public service to rely upon as its primary and in some cases, only communication channel. Iarnród Éireann should not require its customers to engage with a platform facing such significant ethical and safety concerns. Dublin City Council have this week stopped posting on the platform because of these concerns. 

Service Reliability: Relying on a third-party platform also creates vulnerability. Changes to X’s policies, accessibility, or availability are beyond Iarnród Éireann’s control and could impact passengers’ access to vital travel information. EU and Irish law limiting access to these platforms for under 16’s could be introduced in the coming years which would remove the ability for young people to receive up to date journey information.

I would respectfully suggest that Iarnród Éireann implement real-time service updates (including information on delays/cancellations/amendments) directly on irishrail.ie , along with TFI Live and the Irish Rail app, where they can be freely accessed by all passengers without requiring any third-party account. This information is essential public service data and should be universally accessible.

Recommendations for Improved Service Communication

Beyond relocating updates to your own platform, we would like to suggest several improvements to how disruption information is communicated to passengers:

Clear Alternative Transport Information: When disruptions occur, guidance on alternative transport options is often vague or incomplete. For example, announcements stating “Dublin Bus will accept tickets” leave passengers uncertain whether LUAS, Go-Ahead, or LocalLink services are also available. Clear, specific information about all accepted alternative services would significantly reduce passenger confusion and stress during disruptions. Additionally, when a delay does occur, stating ‘operational issues’ does not allow commuters to determine the length of disruption. Commuters could utilise alternate modes of transport in the event of disruption, but cannot make the decision on whether to do so or not without clear information from Iarnrod Éireann. Other international providers have recently switched to a more detailed information provision in the events of issues or delays. For example, Dutch Railways, instead of saying ‘operational reasons’ now say ‘a fallen wire, or broken down train’ that allow passengers to more accurately determine whether to find alternative transport or to wait. It may also be useful to include a scale, letting the customer know whether or not the incident is minor, notable, or major where possible. 

Visual Aids and Information Hierarchy: Reading lengthy blocks of text to understand service disruptions is inadequate, particularly for passengers trying to quickly assess their options whilst at stations or en route. Disruption information would benefit greatly from visual aids such as maps showing affected sections, clear headings, and structured information that allows passengers to quickly grasp the extent and nature of disruptions. A balance must be struck between providing sufficient detail and maintaining clarity.

Integration with Journey Planning Tools: Iarnród Éireann maintains a GTFS (General Transit Feed Specification) data feed that enables real-time information to be pushed to the TFI Live app and third-party applications such as Google Maps or Transit. We strongly encourage Iarnród Éireann to utilise this capability fully, ensuring that disruption information reaches passengers through the multiple platforms they already use for journey planning.

Location-Specific Disruption Guides: For locations where service disruptions occur regularly, Iarnród Éireann should provide dedicated journey planning resources. For instance, a guide explaining “My train has broken down in Greystones, what services can I access from here and where can I find further disruption information?” would be invaluable. Such resources would empower passengers to make informed decisions quickly during stressful situations.

We would appreciate your consideration of this matter and look forward to your response.

South East on Track, Cork Commuter Coalition, Dublin Commuter Coalition, Galway Commuter Coalition.

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Storm Chandra

Posted in Biographical, Maynooth with tags , , , on January 27, 2026 by telescoper

The Irish news today has been dominated by the arrival of Storm Chandra on these shores, accompanied by strong winds, heavy rain and widespread flooding. The whole country has been under a yellow alert, which will last until 11pm today.

The fact that it had been raining very heavily for days before the storm must have saturated the ground, which would have contributed to the flooding. Unusually, the worst has been on the East Coast, with Counties Wexford, Wicklow,  Carlow, and Dublin badly hit. Usually it’s the West of Ireland that bears the brunt of storms which typically come from across the Atlantic.

It’s been a strange day in Maynooth because, despite the storm, the weather hasn’t been too bad at all. There was a long window this morning during which it was actually quite sunny and pleasantly mild, though a bit breezy. The picture on the left shows the situation in mid-morning when the prevailing wind was southerly.

The main mass of raincloud to the North had passed over us by then, and the small but intense strip off the Louth/Dublin coast missed Maynooth entirely. You can see a big gap. Rain was heading towards us from the South, and did reach us in the afternoon, though it wasn’t particularly severe. It remained reasonably warm throughout the day, though it is much colder now (I’m writing this at about 7.30pm).

Dublin is only about 25km from Maynooth and it was a surprise to see major flooding, with parts of the M50 flooded for a time while we experienced nothing particularly severe. Not that I’m complaining!

For more about Storm Chandra, including animations of its progress can be found here. It seems that Great Britain had a lot of weather to contend with!

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The Next Semester

Posted in Artificial Intelligence, Education, mathematics, Maynooth with tags , , , , , , , on January 26, 2026 by telescoper

There’s just a week to go before the next Semester at Maynooth University so I’ve been looking at my calendar for the weeks ahead. Actually, I won’t start teaching again until Tuesday 3rd February, because Monday 2nd February is a national holiday. As it turns out, however, I don’t have any lectures, labs or tutorials on Mondays anyway so I won’t be missing a session either on February 2nd or on May 4th, another holiday. I will have to miss one on Friday 3rd April (Good Friday), though.

The Timetable has given me two 9 o’clock lectures a week for the forthcoming Semester, one on Tuesdays and the other on Thursdays. I don’t think the students like 9am lectures very much, but I don’t mind them at all. I find it quite agreeable to have accomplished something concrete by 10am, which I don’t always do. This schedule might mean that I defer publishing papers at the Open Journal of Astrophysics on those days. I usually do this before breakfast, but I might not have time if I have to be on campus and ready to teach for 9am.

As usual, Semester 2 is a stop-start affair. We have six weeks until the Study Break, which includes the St Patrick’s Day holiday, then we’re back for two weeks (minus Good Friday) before another week off for Easter. We return on Monday April 13th to complete the Semester; the last lectures are on Friday 8th May and exams start a week later. This arrangement creates no problems for lecture-based teaching, but it takes some planning to organize labs and project deadlines around the breaks. I’ll have to think about that for my Computational Physics module.

A more serious issue for Computational Physics is how to deal with the use of Generative AI. I’ve written about this before, in general terms, but now it’s time to write down some specific rules for a specific module. A default position favoured by some in the Department is that students should not use GenAI at all. I think that would be silly. Graduates will definitely be using CoPilot or equivalent if they write code in the world outside university so we should teach them how to use it properly and effectively.

In particular, such methods usually produce a plausible answer, but how can a student be sure it is correct? It seems to me that we should place an emphasis on what steps a student has taken to check an answer, which of course they should do whether they used GenAI or did it themselves. If it’s a piece of code to do a numerical integration of a differential equation, for example, the student should test it using known analytic solutions to check it gets them right. If it’s the answer to a mathematical problem, one can check whether it does indeed solve the original equation (with the appropriate boundary conditions).

If anyone out there reading this blog has any advice to share, or even a link to their own Department’s policy on the use of GenAI in computational physics for me to copy adapt for use in Maynooth, I’d be very grateful!

(My backup plan is to ask ChatGPT to generate an appropriate policy…)

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Man was Made to Mourn – Robert Burns

Posted in Poetry with tags , , , , on January 25, 2026 by telescoper 
When chill November's surly blast 
Made fields and forests bare, 
One ev'ning, as I wander'd forth 
Along the banks of Ayr, 
I spied a man, whose aged step 
Seem'd weary, worn with care; 
His face was furrow'd o'er with years, 
And hoary was his hair. 

"Young stranger, whither wand'rest thou?" 
Began the rev'rend sage; 
"Does thirst of wealth thy step constrain, 
Or youthful pleasure's rage? 
Or haply, prest with cares and woes, 
Too soon thou hast began 
To wander forth, with me to mourn 
The miseries of man. 

"The sun that overhangs yon moors, 
Out-spreading far and wide, 
Where hundreds labour to support 
A haughty lordling's pride; - 
I've seen yon weary winter-sun 
Twice forty times return; 
And ev'ry time has added proofs, 
That man was made to mourn. 

"O man! while in thy early years, 
How prodigal of time! 
Mis-spending all thy precious hours- 
Thy glorious, youthful prime! 
Alternate follies take the sway; 
Licentious passions burn; 
Which tenfold force gives Nature's law. 
That man was made to mourn. 

"Look not alone on youthful prime, 
Or manhood's active might; 
Man then is useful to his kind, 
Supported in his right: 
But see him on the edge of life, 
With cares and sorrows worn; 
Then Age and Want - oh! ill-match'd pair - 
Shew man was made to mourn. 

"A few seem favourites of fate, 
In pleasure's lap carest; 
Yet, think not all the rich and great 
Are likewise truly blest: 
But oh! what crowds in ev'ry land, 
All wretched and forlorn, 
Thro' weary life this lesson learn, 
That man was made to mourn. 

"Many and sharp the num'rous ills 
Inwoven with our frame! 
More pointed still we make ourselves, 
Regret, remorse, and shame! 
And man, whose heav'n-erected face 
The smiles of love adorn, - 
Man's inhumanity to man 
Makes countless thousands mourn! 

"See yonder poor, o'erlabour'd wight, 
So abject, mean, and vile, 
Who begs a brother of the earth 
To give him leave to toil; 
And see his lordly fellow-worm 
The poor petition spurn, 
Unmindful, tho' a weeping wife 
And helpless offspring mourn. 

"If I'm design'd yon lordling's slave, 
By Nature's law design'd, 
Why was an independent wish 
E'er planted in my mind? 
If not, why am I subject to 
His cruelty, or scorn? 
Or why has man the will and pow'r 
To make his fellow mourn? 

"Yet, let not this too much, my son, 
Disturb thy youthful breast: 
This partial view of human-kind 
Is surely not the last! 
The poor, oppressed, honest man 
Had never, sure, been born, 
Had there not been some recompense 
To comfort those that mourn! 

"O Death! the poor man's dearest friend, 
The kindest and the best! 
Welcome the hour my aged limbs 
Are laid with thee at rest! 
The great, the wealthy fear thy blow 
From pomp and pleasure torn; 
But, oh! a blest relief for those 
That weary-laden mourn!"

by Robert Burns (1759-1796); in case you hadn’t realised, tonight is Burns Night, marking the Poet’s birthday on 25th January 1759.

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Bologne, Mozart and Mendelssohn at the National Concert Hall

Posted in Music with tags , , , , , , , , , , on January 24, 2026 by telescoper

Last night I went to another concert by National Symphony Orchestra Ireland at the National Concert Hall in Dublin. This performance was conducted by NSOI’s new “Artistic Partner” Peter Whelan, shown on the programme cover above. The NCH was by no means full, which was a shame, but the concert was warmly appreciated by those of us there in the audience and no doubt by those listening on the radio.

The first item on the agenda was a new one to me, the overture to the Opera L’Amant Anonyme by Joseph Bologne who went by the title Chevalier de Saint-George. He was born in Guadeloupe; his father was a plantation owner and his mother a slave; Saint-George was the name of his father’s plantation. He became an accompished musician, composer and soldier and a member of the Louis XVI’s personal bodyguard. The music we heard is clearly of the same world as Mozart (of whom Bologne was a contemporary) and very enjoyable to listen to. I wonder if we’ll ever get the chance to hear the whole Opera?

After that – and a long pause before she came on stage, that made me worry that something was amiss – we heard Ellinor D’Melon playing the Violin Concerto No. 3 in G Major by Wolfgang Amadeus Mozart, written when Mozart was only 19. This is a lovely piece and was played very nicely by Ellinor D’Melon. Apparently Albert Einstein – himself a keen amateur violinist – said that the second movement Adagio “seems to have fallen straight from Heaven”. It is indeed beautiful to listen to, and does have a sense of unity about it that makes you think it must have been conceived and composed in one go. The play Amadeus seems to have been responsible for perpetuating the idea that Mozart often composed in his head, then wrote the results out without corrections or revisions. That is largely untrue, but it is true that he could construct complex sections in his mind’s ear before setting them down on paper. If he did ever compose a piece entirely from start to finish, then the 2nd movement of this Concerto would be it.

(I can’t resist adding an anecdote suggested by this. A while ago I had to arrange a special sitting of a class test for a student who, for good reasons, couldn’t take the assessment with the rest of the class. I wrote a different paper and invigilated the student myself; there were just the two of us in the room for the test, which was to last 50 minutes. Not anticipating any difficulties I sat at a table in the corner and got on with other stuff. About 15 minutes in, I was concerned that the student hadn’t written anything at all; he seemed just to be reading and re-reading the paper. The questions were not meant to be all that difficult, so it surprised me that the student appeared to be struggling. I didn’t interrupt though. Then, about 5 minutes later the student sat up, grabbed a pen and started to write. Not more that 10 minutes after that he announced he had finished and handed me his script. It contained a perfect answer to everything that had been asked, no corrections or crossings out, and it took up less than one page of A4. I was impressed.)

After the wine break we heard the Symphony No. 3 in A minor (“Scottish”) by Felix Mendelssohn. Inspired by a visit to Scotland in 1829 – the first movement was actually composed that year in Edinburgh – it wasn’t completed until over a decade later and should probably be No. 5, but who’s counting? I’ve never really found it very Scottish, actually, but that doesn’t matter either.

It’s a piece consisting of four movements, with little or no break between them. The first movement starts with a slow theme, like a hymn, but then becomes much more reminiscent of the Hebrides Overture Mendelssohn composed in 1830. The landscape of the other three movements is very varied, sometimes cheery, sometimes lush, sometimes tempestuous. The final movement Allegro Vivacissimo has a marking guerriro (“warlike”), which in parts it is, but it also has calmer and more reflective passages before the rumbustious finale. I suppose many people consider Mendelssohn a bit Middle-of-the-Road, but I always find his music very pleasurable and this was no exception.

I always enjoy watching the musicians in these concerts, and could see last night that they were all enjoying themselves hugely. I’d like to single out the sole member of the percussion section, Tom Pritchard on timpani. He had to work hard for nearly all of this performance, as the timpani are kept very busy this work, and did an excellent job.

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Weekly Update from the Open Journal of Astrophysics – 24/01/2026

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , , , , , , , , , , , on January 24, 2026 by telescoper

It’s Saturday once more so time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further three papers, bringing the number in Volume 9 (2026) to 14 and the total so far published by OJAp up to 462. This week was slightly affected by a Federal holiday in the USA on January 19th; there were no arXiv announcements the following day.

I will continue to include the posts made on our Mastodon account (on Fediscience) to encourage you to visit it. Mastodon is a really excellent service, and a more than adequate replacement for X/Twitter which nobody should be using.

The first paper to report this week is “The Properties of Little Red Dot Galaxies in the ASTRID Simulation” by Patrick LaChance, Rupert A. C. Croft, Tiziana Di Matteo & Yihao Zhou (Carnegie Mellon U.), Fabio Pacucci (Harvard-Smithsonian CfA), Yueying Ni (U. Michigan Ann Arbor), Nianyi Chen (Princeton U.) and Simeon Bird (UC Riverside), all based in the USA. This paper was published on Monday 19th January 2026 in the folder Cosmology and Nongalactic Astrophysics; the study analyses mock observations of “Little Red Dot” galaxies created from the ASTRID simulation, having high stellar masses and containing massive black holes; not all features match real observations.

The overlay is here:

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics; "The Properties of Little Red Dot Galaxies in the ASTRID Simulation" by Patrick LaChance, Rupert A. C. Croft, Tiziana Di Matteo & Yihao Zhou (Carnegie Mellon U.), Fabio Pacucci (Harvard-Smithsonian CfA), Yueying Ni (U. Michigan Ann Arbor), Nianyi Chen (Princeton U.) and Simeon Bird (UC Riverside), all based in the USA

doi.org/10.33232/001c.155493

January 19, 2026, 10:33 am 2 boosts 1 favorites

The second paper is “Angular bispectrum of matter number counts in cosmic structures” by Thomas Montandon (U. Montpellier, France), Enea Di Dio (U. Genève, Switzerland), Cornelius Rampf (Ruđer Bošković Institute, Croatia) and Julian Adamek (U. Zürich, Switzerland). This was published on Wednesday January 21st, also in the folder Cosmology and Nongalactic Astrophysics. This paper presents thee first full-sky computation of the angular bispectrum in second-order perturbation theory, offering insights into the Universe’s initial conditions, gravity, and cosmological parameters. The results align well with simulations.

The overlay for this one is here:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Angular bispectrum of matter number counts in cosmic structures" by Thomas Montandon (U. Montpellier, France), Enea Di Dio (U. Genève, Switzerland), Cornelius Rampf (Ruđer Bošković Institute, Croatia) and Julian Adamek (U. Zürich, Switzerland)

doi.org/10.33232/001c.155624

January 21, 2026, 9:30 am 1 boosts 0 favorites

Next, and last for this week, we have “The Kinematic Properties of TŻO Candidate HV 11417 with Gaia DR3” by Anna J. G. O’Grady (Carnegie Mellon University, USA). This was published on Wednesday 21st January 2026 in the folder Solar and Stellar Astrophysics. This work uses updated data to confirm that HV 11417, a potential Thorne-Żytkow Object, is probably part of the Small Magellanic Cloud and qualifies as a runaway star.

The overlay is here:

The official version can be found on arXiv here and the Fediverse announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "The Kinematic Properties of TŻO Candidate HV 11417 with Gaia DR3" by Anna J. G. O'Grady (Carnegie Mellon University, USA)

doi.org/10.33232/001c.155625

January 21, 2026, 9:45 am 1 boosts 1 favorites

That concludes the update for this week. I will do another next Saturday.

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The Kilmainham Gaol Scam: yet another Reason not to use Google

Posted in History, Television with tags , , , on January 23, 2026 by telescoper

Last night, while I was waiting for Derry Girls to come on, I watched a part of Prime Time on RTÉ, a segment about how many people intending to visit Kilmainham Gaol Museum in Dublin had bought tickets online only to find out they had been scammed and the tickets weren’t valid. Worse, having entered their credit card details into a phoney website they then either lost further money or had to cancel their compromised cards. You can read more about this scandal here.

A major part of the success of this scam is that Google search highlighted the fake sites – several of them – by ranking them above the official site in search results All you need to do to get your site promoted in this way is to pay money to Google. Although Google had been informed about this con, at least some of the sites concerned were still up and running when the programme went out last night. It seems to me that Google was and is a party to this fraudulent activity, but it’s unlikely to be prosecuted, presumably for the same reason that nobody is prosecuting X/Grok for its illegal production and distribution of child pornography: the Irish State is deep in the pockets of Big Tech and won’t stand up to it whatever crimes it commits.

Anyway, I have some recommendations. First, don’t use Google search. Second, if you do use Google search, then at least disable “sponsored” searches as these include fraudulent sites. There are various ways to do this but they depend on your browser and OS so you will have to find out. Finally, no tickets to Kilmainham Gaol are available from any third-party providers, so use the official site. The front page should look like this:

If it doesn’t look like that then you have landed in the wrong place and should leave.

Please don’t let this put you off visiting Kilmainham Gaol Museum. It’s an important part of Ireland’s story. It was, for example, where the leaders of the 1916 Easter Rising were executed by firing squad. It is very busy, though, so you will almost certainly have to buy tickets in advance; a small number are released each morning but they go very quickly.

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Dark Energy Survey Year Y6 Results Day!

Posted in The Universe and Stuff with tags , , , , , , on January 22, 2026 by telescoper

This morning’s arXiv announcement contained a number of papers related to the Dark Energy Survey Y6 analysis. There is also a Zoom webinar later today at 10.30 Central Time (16.30 GMT; 13.30 in Greenland). Details can be found here.

You can find links to and abstracts of all the papers here, but I thought it would be useful to provide arXiv links to the latest batch here.

  • arXiv:2601.14559 Dark Energy Survey Year 6 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing – this is the key summary paper.
  • arXiv:2601.14484 Dark Energy Survey Year 6 Results: MagLim++ Lens Sample Selection and Measurements of Galaxy Clustering
  • arXiv:2601.14864 Dark Energy Survey: DESI-Independent Angular BAO Measurement
  • arXiv:2601.15175 Dark Energy Survey Year 6 Results: Galaxy-galaxy lensing
  • arXiv:2601.14833 Dark Energy Survey Year 6 Results: Magnification modeling and its impact on galaxy clustering and galaxy-galaxy lensing cosmology
  • arXiv:2601.14859 Dark Energy Survey Year 6 Results: Weak Lensing and Galaxy Clustering Cosmological Analysis Framework

A number of DES Y6 papers already published – including several in the Open Journal of Astrophysics – are listed here.

I’ll just highlight a couple of points from the first paper listed above, which uses the now standard “3x2pt” analysis, which combines three complementary two-point correlation functions: cosmic shear; galaxy-galaxy lensing and galaxy clustering. The abstract of this paper is as follows:

A notable result is contained in the last sentence. The simplest interpretation of dark energy is that it is a cosmological constant (usually called Λ) which – as explained here – corresponds to a perfect fluid with an equation-of-state p=wρc2 with w=-1. In this case the effective mass density  ρ of the dark energy remains constant as the universe expands. To parametrise departures from this constant behaviour, cosmologists have replaced this form with the form w(a)=w0+wa(1-a) where a(t) is the cosmic scale factor. A cosmological constant Λ would correspond to a point (w0=-1, wa=0) in the plane defined by these parameters, but the only requirement for dark energy to result in cosmic acceleration is that w<-1/3, not that w=-1. Results last year from DESI suggested values of w0 ≠-1 and wa≠0 , but the current DES results are consistent with w=-1; they do not constrain w0 and wa jointly.

For reference on the left you can find the (w0, wa) plane from DESI.

I thought I’d add one of the other cosmological contraint plots:

The results look qualitatively similar to previous plots but the contours have shifted a bit.

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The growth of light seed black holes in the early Universe

Posted in Maynooth, The Universe and Stuff with tags , , , , , on January 21, 2026 by telescoper

Meanwhile, back in the world of research, I see that Maynooth University has issued a news item about a new paper by colleagues in the Department of Physics, Daxal H. Mehta, John A. Regan and Lewis Prole. The story has also been picked up by the Irish media, e.g. here.

You may find the paper behind a paywall, as it is published in Nature Astronomy, in which case you will just have to make do with the abstract:

And here’s a pretty picture from one of the simulations used in the paper:

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The Girl from Greenland – Chet Baker

Posted in Jazz with tags , , on January 20, 2026 by telescoper

One reason this track caught my eye is probably obvious given current events, but another is that the tune was written by another superbly individual yet largely forgotten pianist from the 1950s, Dick Twardzik. Sadly Twardzik died of a drug overdose just a few days after this was recorded, in October 1955 at the age of just 24. Chet Baker – who had his own share of problems with narcotics – became very popular for his very attractive singing voice as well as his “cool” trumpet tone, but this one is purely instrumental. The other members of the quartet are Peter Littman (drums) and Jimmy Bond (bass).

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