Four New Publications at the Open Journal of Astrophysics

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , , , , , , on September 29, 2024 by telescoper

A day later than has been usual for such things, it’s now time for a quick update of activity at the Open Journal of Astrophysics. This week we have published another batch of four papers which takes the count in Volume 7 (2024) up to 81 and the total published altogether by OJAp up to 196. I think there may come a week in we publish papers on every day of that week, but it was not this week…

In chronological order, the four 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.

First one up is “Finding the unusual red giant remnants of cataclysmic variable mergers” by Nicholas Z. Rui and Jim Fuller of California Institute of Technology (Caltech), USA. It presents a discussion of the possible photometric, astroseismological, and surface abundance signatures of red giants formed by mergers of cataclysmic variable stars. It was published on 23rd September 2024 and is in the folder marked Solar and Stellar Astrophysics.

Here is a screen grab of the overlay, which includes the abstract:

 

 

You can find the officially accepted version of the paper on the arXiv here.

The second paper to announce, also published on 23rd September 2024, is “Notes on the Practical Application of Nested Sampling: MultiNest, (Non)convergence, and Rectification” by Alexander Dittmann (U. Maryland, USA). A critical analysis of the MultiNest algorithm together with suggestions for approving its applicability. It is in the folder Instrumentation and Methods for Astrophysics.

You can see the overlay here:

 

 

The accepted version of this paper can be found on the arXiv here.

The third paper, published on 24th September 2024 in the folder marked High-Energy Astrophysical Phenomena, is called  “Merger Precursor: Year-long Transients Preceding Mergers of Low-mass Stripped Stars with Compact Objects” and is by Daichi Tsuna, Samantha Wu & Jim Fuller (Caltech), Yize Dong (UCLA) and Anthony Piro (Carnegie Observatories), all based in the USA.

Here is the overlay

 

 

The final version accepted on arXiv is here.

Last in this batch is “Spectroscopic Observations of the GALEX Nearby Young Star Survey Sample. I. Nearby Moving Group Candidates” by Navya Nagananda (Rochester, NY, USA), Laura Vican (UCLA), Ben Zuckerman (UCLA), David Rodriguez (STScI), Alexander Binks (Tübingen, Germany) & Joel Kastner (Rochester). It describes investigations of the spectra of the GALNYSS sample of over 2000 young stars and the assignment of these stars into moving groups. It is is in the folder marked Solar and Stellar Astrophysics, and was published on 25th September 2024 with this overlay:

 

You can find the official accepted version on the arXiv here.

That’s all for now. I will post another update in a week.

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R.I.P. Maggie Smith (1934-2024)

Posted in Film, R.I.P., Television with tags , , , , , , , , , on September 28, 2024 by telescoper

I heard yesterday of the death at the age of 89 of the great Maggie Smith. Tributes have been appearing around the world at the loss of such a great talent and wonderful personality. I can’t add anything to these except to say that I adored her.

I guess many people will be most familiar her through the work she did in later life, such as the Harry Potter franchise and Downtown Abbey but as an oldie I will always think of her as the eponymous Edinburgh schoolteacher in the 1969 film The Prime of Miss Jean Brodie, based on the Muriel Spark novel of the same name, for which she deservedly won an Oscar as Best Actress for her portrayal of Jean Brodie, an over-zealous teacher with a soft spot for Mussolini’s Fascisti. Here’s the original trailer.

I do hope this film gets shown again soon as a tribute, as it is really superb.

Maggie Smith as Lady Constance Trentham in Gosford Park (2001)

Other roles I particularly remember Maggie Smith for are in are California Suite (for which she also won an Oscar, as Best Supporting Actress). She was absolutely hilarious in Murder by Death, her perfect sense of comic timing generating numerous laugh-out-loud moments in that film.

Maggie Smith with David Niven in Murder by Death (1976)

Maggie Smith was also memorable as the splendidly rude Lady Constance in Gosford Park, a role you might think of as a sort of prelude to her part in Downton Abbey. There are countless other performances I could mention too, on TV, on Film and in the Theatre. She was tremendously versatile and talented, as well as extremely funny. She admitted having learnt a great deal about comedy from Kenneth Williams, with whom she was great friends for a long time.

Rest in peace, Maggie Smith. You’ll be missed so much.

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Leonard Slatkin at 80

Posted in Biographical, Music with tags , , , , , , on September 28, 2024 by telescoper

Last night found me once again at the National Concert Hall in Dublin for a concert by the National Symphony Orchestra conducted this time by Leonard Slatkin, who has a long association with the NSO and who was 80 years old on 1st September. I must say he looked very sprightly for a man eighty years of age!

To start the programme we had the world premiere of a piece by Leonard Slatkin’s son, Daniel. Voyager 130 was inspired by the Voyager space mission, and especially by the Golden Records carried by the Voyager probes. Among the pieces of music included on those records is the exquisite Cavatina from Beethoven’s String Quartet No. 13 (Opus 130) from which the composer borrows thematic material for this piece. Daniel Slatkin was actually in the audience for this – in fact he was sitting just two rows in front of me – and went up on stage after the very enjoyable performance.

After that, and some rearranging on stage, we had a performance of Beethoven’s Piano Concerto No. 4 with Dublin-born soloist Hugh Tinney. Although for its time it was very unconventional in structure, this is now a very familiar piece in the concert hall. For the most part it was played very well but I did think the orchestra were a bit stiff and lacking in expression in places. The performance was warmly received by the NCH audience, and Hugh Tinney received a standing ovation at the end.

After the wine break we had another familiar work, the Symphony No. 3 by Johannes Brahms, which Leonard Slatkin conducted without a score. I’m persevering with Brahms. I still don’t find that he moves me as much as many other composers and so many people rave about him that I think I must be missing something. The 3rd Symphony is a very fine work, offering lots of variety across its four movements while maintaining a strong sense of coherence and remaining relatively concise – it lasts about 33 minutes in performance. I’m no expert on Brahms but it seems to me that the 3rd Symphony is where he really found his voice as a symphonic composer and stepped out from the shadow of Beethoven.

Apart from the first piece, it was a very conventional programme but I enjoyed it as did the audience. It’s a pity there weren’t more people there, though. I’d guess that the NCH was about 2/3 full at most.

P.S. Last night Leinster rugby were playing a match at Landsdowne Road (beating the Dragons 34-6) and Shelbourne were playing Sligo Rovers at home in the League of Ireland (a 0-0 draw) so the train home was a bit busier than last time but still uneventful. When I got home later I decided to listen to a recording of the Beethoven Strong Quartet No. 13 before bed…

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Dark Matter from Primordial Black Holes?

Posted in The Universe and Stuff with tags , , , , , , , , , on September 27, 2024 by telescoper

We live in a cyclic universe of a sort because every few years somebody tries to resurrect the idea that dark matter is somehow related to primordial black holes, i.e. black holes formed in the very early stages of the history of the Universe so that they have masses much smaller than black holes formed more recently by the collapse of stars or the merger of other black holes. If it forms very early the mass of a PBH could in principle be very small, much less than a star or a planet. The problem with very small black holes is that they evaporate very quickly via Hawking Radiation so would not survive the 14 billion years or so needed to still be in existence today and able to be dark matter.

An idea that was used in the past to circumvent this issue was that something might stop Hawking Radiation proceeding to reduce the mass of a PBH to zero, leaving a relic of finite mass usually taken to be the Planck mass. The suggestion has returned in different (but still speculative) guise recently, fueling a number of media articles of varying degrees of comprehensibility, e.g. here. The technical papers on which these articles are based can be found here and here.

Fortunately, there is now one of those excellent Cosmology Talks explaining the latest idea of how Hawking Radiation might break down and what the consequences are for Primordial Black Holes as a form of Dark Matter.

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Keeping one’s head above water..

Posted in Biographical, Education, Maynooth on September 26, 2024 by telescoper

I had two teaching sessions today, on two different modules, both of which I’m teaching for the first time, and also had to prepare the first assignments for both sets of students, so I thought it might be a difficult challenge, metaphorically speaking, to keep my head above water. What I hadn’t expected, however, was that the rain would be bucketing down all day, making it almost literally difficult to keep above water. Now that I’ve done what I planned to do at work I have to make my way home through the deluge. At least I remembered to bring a brolly…

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The Case Against Academic Publishers

Posted in Open Access with tags , , , , , on September 25, 2024 by telescoper

It seems appropriate to pass on news of a federal antitrust lawsuit being brought in the United States against six commercial academic publishers, including the “Big Four” (Elsevier, Springer Nature, Taylor & Francis and Wiley). The case is filed by lawyers Lieff Cabraser Heimann and Bernstein. The plaintiff is Lucina Uddin, Professor of Psychology at UCLA.

I suggest you read the full document linked to above for details, but in a nutshell the case alleges three anticompetitive practices:

  1. agreeing to “fix the price..at zero” for the labour of authors and peer reviewers;
  2. agreeing not to compete for manuscripts by forcing authors to submit to one journal at a time;
  3. agreeing to prohibit authors from sharing their work while under peer review, “a process that often takes over a year”

I’ve spoken to a few people who know a bit about US law on such matters and they all say that the plaintiff’s legal representatives have a good track record on antitrust litigation. Nevertheless, there is some doubt about whether the case is winnable but at the very least it will bring a lot of attention to the Academic Journal Racket, so is probably a good move even if it doesn’t succeed. If it does succeed, however, it might blow a hole in the entire commercial publishing industry, which would be an even better move…

As an interesting postscript (found here) is that, in 2002, the UK Office of Fair Trading reviewed complaints about anticompetitive practices in academic publishing; see here. It found market distortions but decided not to act because of the recent rise of Open Access. I quote

It is too early to assess what will be the impact of this … but there is a possibility that it will be a powerful restraint on exploiting positional advantage in the STM journals market.

Now that 22 years have passed, is it still too early?

P.S. Comments from legal experts would be especially welcome!

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Back to Teaching

Posted in Education, mathematics, Maynooth with tags , , on September 24, 2024 by telescoper

So, after an absence from teaching of over a year, this afternoon I returned to the lecture theatre to give a double session on the module EE206 Differential Equations and Transform Methods. I was a bit apprehensive about having a two-hour slot and it is fair to say that I felt a bit knackered after it, but `then I am getting on a bit. I did have time for a ten-minute break in the middle during which the students could relax and stretch their legs a little. Some of them even came back afterwards.

This module is meant for students on two courses, Electronic Engineering and Robotics and Intelligent Devices, so I will have to think of relevant examples. I’ve got the RLC circuit, of course, but I’ll have to more than that!

If you’re interested you can find an old summary of the module here to see what topics are covered.

The good news from my point of view is that I have a decent room to teach in – complete with chalk boards – and the students seemed pleasant and engaged. I always like to get some interaction going in my classes so it was good to find a reasonable number of people willing to offer answers to questions I asked and indeed willing to ask me questions or request clarification. Overall, I was quite pleased with how it went. You will have to ask the students to see if they agree. At any rate I did manage to get through everything I planned to cover. The class size is about 55, incidentally.

Anyway, today I just warmed up for the module with some revision of basic calculus. I had pessimistically imagined that the students would have forgotten what they did in the first year about this, but in fact quite a few of them remembered quite a lot. I have my second session with this group on Thursday, though that should be a bit easier as it is only one hour instead of two. I will start differential equations proper then.

My remaining teaching sessions this week are all in the Arts Building. I have been quite worried that the rooms I am supposed to use would not be ready in time, but I took a walk around yesterday morning and they are ready (although construction work is going on elsewhere in the block). I was thinking I might have to give these lectures via a remote connection from home as in the old days of the pandemic, but that fortunately is not the case.

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The Opening of the Fifth Seal

Posted in Art with tags , , , on September 23, 2024 by telescoper

I was trying to find a work of art with which to illustrate the start of teaching term and decided on this remarkable painting by El Greco, usually called The Opening of the Fifth Seal though it has been given other names. Actually it’s only part of the original painting – the upper section was destroyed in 1880 – which at least partly accounts for the unusual balance of the composition. What I find astonishing about this work, though, is that at first sight it looks for all the world like an early 20th Century expressionist work, complete with distorted figures and vivid colour palette. It’s very hard to believe that it was painted in the early years of the 17th Century! El Greco was 300 years ahead of his time.

by Doménikos Theotokópoulos (“El Greco“), painted between 1608 and 1614, 224.8 cm × 199.4 cm, oil on canvas, The Metropolitan Museum of Art, New York.

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Autumnal Equinox 2024

Posted in Biographical, Education, Maynooth, The Universe and Stuff with tags on September 22, 2024 by telescoper

The Autumnal Equinox (in the Northern hemisphere) takes place this afternoon (Sunday 22nd September 2024)  at 13.44 Irish Summer Time (12.44 UT).

Although  the term `equinox’  refers to a situation in which day and night are of equal length, which implies that it’s a day rather than a specific time, the astronomical equinox is more accurately defined by a specific event, i.e. when the plane defined by Earth’s equator passes through the centre of the Sun’s disk (or, if you prefer, when the centre of the Sun passes through the plane defined by Earth’s equator). Day and night are not necessarily exactly equal on the equinox, but they’re the closest they get. From now on days in the Northern hemisphere will be shorter than nights and they’ll get shorter still until the Winter Solstice on 21st December 2024 at 9.21am Irish Time.

Many people take the autumnal equinox to be the end of summer. There is a saying around these parts, however, that `Summer is Summer to Michaelmas Day’ (September 29th), which is not until next week. I must say, though, though it doesn’t feel particularly summery this morning although we did have good weather for most of last week. Looking back over my posts on past occurrences of the Autumnal Equinox, it is notable how many talk about a period of good weather around this time of year. The Welsh phrase Haf Bach Mihangel (Michael’s Little Summer) refers to this kind of spell.

I’ve often remarked how the academic year at Maynooth is largely defined by the astronomical phenomena of the equinoxes and solstices. This year demonstrates this perfectly: Semester 1 lectures for undergraduates begin tomorrow (23rd September), the day after the Autumnal equinox; they end on 20th December, the day before the Winter Solstice. The half-term study break coincides with Samhain, a cross-quarter day. It’s all refreshingly pagan.

This time last year I was getting ready to travel to Barcelona. My sabbatical started on 1st September but I didn’t actually leave for Spain until 24th September. That all seems a very long time ago now, and my sabbatical is well and truly over. I resume teaching next week, though my first lectures (a double session of Engineering Mathematics) are not until Tuesday. I hope I can remember how to teach! I’m also doing Differential Equations and Complex Analysis for 4th Year Mathematical Physics students, but the lectures for that are a bit later (Thursday and Friday). I have taught neither of these modules before, so I am a bit apprehensive.

I now know what I’ll be teaching next Semester too. I’m returning to Computational Physics 1, which I taught for 5 years before my sabbatical, so that’s a familiar one. I’m also doing Particle Physics for 4th year students. I taught a full module in that at Nottingham and a half-module in Cardiff so it’s not exactly new but I haven’t lectured in the subject since about 2010. Has anything important happened in that field since then? I assume that had there been, for example, any new boson discovered I would have heard about it…

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Random Gallery

Posted in Biographical, Maynooth with tags on September 21, 2024 by telescoper
A cloudy day on campus
A sunny day on campus
It seems I’ve been demoted as well as elevated…
They’ve changed the signs already!
remains of a dead pigeon
Not to mention the entropy!
I found this in my office. I don’t know what it is but apparently it belongs to someone called Jack Splitter

In the absence of anything better to post, I thought I’d share a few random pictures I’ve taken around Maynooth University campus since I moved into my new office.

Oh, I’ll just add this little anecdote. I was away from campus on Thursday and after I had done the necessary I was required to take a taxi home. The taxi driver asked me what I did for a living and when I told him he said he was fascinated interested in nuclear physics and proceeded to ask me a series of questions including what heavy water is, whether plutonium occurs naturally, and what is measured in röntgen. It’s always nice when a member of the public shows an interest in physics.

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