Author Archive

Weird Matter at MU!

Posted in Maynooth, Talks and Reviews, The Universe and Stuff with tags , on August 19, 2023 by telescoper

I mentioned a while ago that Maynooth University is hosting a theoretical physics meeting early next month, from September 6th to 8th; for details see here. It has been decided that there will be a couple of public evening lectures as a double-header on the first night of the conference. One of the speakers is me. Technically I’ll be on sabbatical from September 1st but I’ve delayed my travels to allow me to ive this talk. Anyway, the advert is here:

You can join us for this “evening of science celebrating the weird and wonderful ways that matter can manifest in our universe” by getting a ticket at Eventbrite below.

Tickets are free but you do need to register in advance!

Changes to the IAU Code of Conduct on Harassment

Posted in Harassment Bullying etc with tags , , on August 18, 2023 by telescoper

An email was sent on Wednesday from the President of the International Astronomical Union (IAU), Debra Elmegreen, to all members of that organization (which includes me). Part of that email has caused a considerable negative reaction among astronomers on social media, so I’m taking the liberty of posting the offending section here and commenting on it below.

This is what sparked the reaction:

The Executive Committee modified further details in the Code of Conduct. On p. 6 in the Harassment Policy, a link is given to UN definitions of harassment in different countries.

The most substantive change is on p. 7: “It is a form of harassment to physically or verbally abuse or discriminate against alleged offenders of IAU’s policies, or if such policies are found to have been breached, inflict (or pressure others to inflict) punishments besides those officially sanctioned. In addition, the physical or verbal abuse or discrimination of those who work or have worked with the alleged or sanctioned perpetrator, simply because of their scientific collaboration, is also a form of harassment and as such is covered by this policy.”

(I’ve added the link to the full code of conduct myself).

The first point to make is that the Code of Conduct here can and does apply only to specific IAU activities and meetings, which strictly limits its scope. It is mostly about behaviour during meetings, in fact. I also think much of the reaction to this change has resulted from reading that paragraph in isolation. It does make more sense when read in the context of the whole document. In particular, the paragraph alone says little about other victims of harassment but that is covered in the rest of the document, which runs to 13 pages.

Now to the amended text.

I think everyone agrees that physical or verbal abuse should never be condoned, but (a) that is covered by the Code of Conduct generally so there is no need to repeat it here, and (b) the addition of the word “discriminate” here is troublesome because it is so vague. The first sentence treats those against whom allegations have been made and those against allegations have been upheld in exactly the same way. I think that is fine for the “physically or verbally abuse” part, but extending it to “discriminate” is deeply problematic, depending on how one interprets the word. Is it now harassment for the organizers of a meeting to fail to invite to a meeting someone who has a track-record of sexual harassment? Or for a victim of harassment to refuse to work with a known harasser? Is it not up to individuals to decide with whom they want to work? Should anyone be immune from criticism of their choices?

One could take the view that anyone against whom serious allegations have been upheld should not be welcome at IAU meetings, and probably no longer be a member of the organization, so this situation should not arise within the scope of the Code of Conduct:

The IAU Executive Committee may decide on further disciplinary action for repeat or serious
offenders, such as being banned from participating in future IAU meetings or other IAU related
activities for a period of time, or even having the offender’s IAU membership revoked in
serious cases.

IUA Code of Conduct, p 10.

This of course depends on the interpretation of what “serious” means. Aren’t all examples of harassment to be taken seriously?

In any case I’m bound to say that if I were expelled from the IAU, it would have precisely zero effect on my life, career, or anything else.

The next clause is even worse: apparently it is harassment to “inflict (or pressure others to inflict) punishments besides those officially sanctioned.” Suppose then that a victim of harassment tries to take disciplinary action against the perpetrator through a mechanism outside the IAU (i.e. through the harasser’s employer). Is the victim then guilty of harassment? If a victim of harassment informs an early career researcher about their potential PI’s past behaviour, is that “pressure”?

The second sentence must have been introduced to protect those who may have experienced negative reactions as a result of working with a known harasser; an example testimony of such alleged “guilt by association” is given here; though see here for another view of the same event. Bearing in mind that early career researchers often have no choice with whom they work anyway, this change has some sense to it though one can hardly expect a decision to work with someone with a track-record of bad behaviour to pass without comment from people who have been victims of such behaviour.

My overall reaction to this change, giving the benefit of the doubt to its creators, is that it is badly worded and so muddled that it gives the impression of treating a history of harassment as a protected characteristic which cannot be the intention. I’d suggest getting someone with legal competence to rewrite this part of the changed policy. I’d also encourage other IAU members to write directly to the President if they feel strongly about this change.

P.S. On a procedural point, note that the preamble to the amendment quoted above states “The Executive Committee modified further details in the Code of Conduct.” Such a change is not within the scope of the Executive Committee as defined by the IAU Statutes. Statute 18:

The Officers of the Union are the President, the General Secretary, the President-Elect, and the Assistant General Secretary. The Officers decide short-term policy issues within the general policies of the Union as decided by the General Assembly and interpreted by the Executive Committee.

IAU Statute 18

So it is the job of the Executive Committee to interpret policies, not to create them. I think we need to know who changed what and for what purpose.

Update: An email in response to the criticism has been sent out by IAU President, Debra Elmegreen. It’s not very satisfactory, but at least it includes: “We… will consider suggestions for improved wording to the Code of Conduct to clarify possible misunderstandings”.

Another Update: Physics World has run a story on this (which links to this post).

R.I.P. Michael Parkinson (1935-2023)

Posted in Jazz, R.I.P., Television with tags , , , on August 17, 2023 by telescoper

More sad news today. Chat show host and journalist Michael Parkinson has passed away at the age of 88. I watched his show very frequently on Saturday nights during its first run (from 1971 and 1982) and remember many great interviews he did, especially with wonderful raconteurs such as Peter Ustinov and Kenneth Williams.

I can’t add much to the extensive obituaries you can find in the regular media except to say that Parky was a big fan of jazz, as am I, and he often got jazz musicians on his show. One example I remember vividly watching 50 years ago (!) in 1973 was Duke Ellington. I remember the interview very well, but what I remember even better was the impromptu postscript. As they were wrapping up the recording, Ellington said he wanted to play a number with the resident band (led by Harry Stoneham on the organ), who I’m sure were absolutely thrilled at the prospect. What followed was this version of Ellington’s own tune Satin Doll. Parky’s show had its own signature tune, but I don’t think he’d mind being played out with this…

R.I.P. Michael Parkinson (1935-2023)

R.I.P. Mark Birkinshaw (1954-2023)

Posted in Biographical, R.I.P., The Universe and Stuff with tags , , , , on August 17, 2023 by telescoper

I just heard this morning of the passing of Mark Birkinshaw (left) who was, since 1992, William P. Coldrick Professor of Cosmology and Astrophysics at the University of Bristol. Before that he held positions in Cambridge and Harvard.

I’m told that he died in hospital of a “short but serious illness”.

Among other important contributions to cosmology and astrophysics, in 1984, along with Steve Gull of Cambridge and Harry Hardebeck of the Owens Valley Observatory, was the first to measure experimentally the Sunyaev-Zel’dovich effect in a galaxy cluster; the reference is here.

It was in Cambridge as an undergraduate that I first met Mark Birkinshaw. He taught the long vacation course on Physical Applications of Complex Variables that I took in the summer of 1984. It was a tough course but he was an excellent teacher. All these years later I still have my handwritten notes for that course as well as the handouts. I still use them too.

After that I saw him regularly at conferences and seminars and on various committees for PPARC and then STFC. He was extremely diligent in such “community service” roles and was an invaluable contributor owing to his wide range of knowledge beyond his own speciality.

Having been a mainstay of astrophysics research at Bristol University for over thirty years, Mark will be greatly missed. I send condolences to his friends and colleagues at Bristol and elsewhere in the world, and especially to Diana. You can send thoughts, tributes and condolences and/or make a charitable donation in Mark’s memory here, where there are also details of the funeral arrangements.

Winding Up

Posted in Biographical, Education, Maynooth with tags , , , on August 16, 2023 by telescoper

This morning, we held the last meeting this academic year of the Departmental Examination Board to look over the results of the recent repeat examinations ahead of the final upload this afternoon. That having been satisfactorily completed, I have now finished my teaching-related duties for this academic year. I start a year’s sabbatical on 1st September, so I won’t be attending more Exam Boards for a while!

Another loose end to be dealt with was the Departmental Twitter account, which I have been running. Twitter is really terrible these days and I have decided to deactivate my own personal account entirely on 31st August. The departmental account probably should stay open, so this afternoon I transferred its controls to our Departmental Adminstrator. Just before doing so, I realised that the password was a bit rude, so I quickly changed it to something more presentable before handing it over to avoid embarrassment.

If you want to follow that account, by the way, you can!

All I have left to do now is remove a few personal things from my office for whoever uses it next academic year. I’ve got plenty of time to do that, although I will be away for part of next week (way down South, in Cork).

Tonight, however, although it’s a school night, I think I’ll celebrate by having a little drink and watching the Super Cup Final between Man City and Sevilla the telly box. Cheers!

Euclid Update

Posted in Euclid with tags , , , , , on August 15, 2023 by telescoper
ESA/Euclid/Euclid Consortium/NASA. Background galaxies: NASA, ESA, and S. Beckwith (STScI) and the HUDF Team.

Since I’ve been working today on stuff related to ESA’s Euclid mission, I thought I would post a brief update on the mission status before I go home. The official channel to which I refer you for full updates is here.

A message was sent out on Saturday to member of the Euclid Consortium indicating that the commissioning phase of the Euclid satellite was essentially completed, although with some issues still to be fixed. In particular, as has previously been reported, there is an issue with stray light in the VIS instrument, which will have to be coped with. To prevent stray sunlight getting onto VIS detectors, Euclid will be configured to operate at a range of specific angles with respect to the Sun. This means that the survey strategy will have to be adapted in order to be as optimal as possible with this new constraint.

The next phase after the commissioning phase is called performance verification, for which control switches over to the science ground segment. The operations team will then operate the spacecraft in the same way as required for the full survey in order to assess the performance of the instruments and obtain calibration data ahead of the start of the full survey.

Blues for the Fisherman

Posted in Biographical, Jazz with tags , on August 15, 2023 by telescoper

I had a pleasant surprise when I switched on the radio last night to listen to The Blue of the Night in that the presenter Bernard Clarke not only played a lot of music by the late great Art Pepper but also mentioned my name on air for having pointed him at the particular session from which he chose the tracks. I think he mistakes me for some sort of expert!

Anyway, listening last night brought back a lot of memories of hearing Art Pepper play in the flesh and many nights I spent in Ronnie Scott’s club during the 1990s when I lived in London. I thought I’d share here one of the tracks played last night.

The performance in question was recorded live at Ronnie Scott’s Club in London in June 1980 and first released on the small British record label Mole Jazz, an offshoot of the famous (sadly now defunct) record shop of the same name that used to be on Gray’s Inn Road. It’s a brilliant, brilliant album, with the intense atmosphere of a live performance adding to the superb playing of the musicians. It’s also extremely well recorded – so much so that you feel you are on stage with the musicians!

The band is listed as the “Milcho Leviev Quartet featuring Art Pepper”, although that was probably for contractual reasons, as this was the same band that toured extensively as “The Art Pepper Quartet”: Art Pepper on alto saxophone, Milcho Leviev on piano, Tony Dumas on bass and Carl Burnett on drums. I was also lucky enough to see this band play live at the Newcastle Jazz festival in 1981, not long after this recording, and they were great then too although that was in a concert hall so had a much less intense atmosphere. Art Pepper sadly passed away in 1982 and Milcho Leviev in 2019.

As far as I’m aware this record wasn’t released on CD until relatively recently, but now a whole lot of extra tracks recorded during Art Pepper’s residency in Frith Street are also available. There’s so much to enjoy in these recordings, including the superb drumming of Carl Burnett and virtuosic piano of Milcho Leviev, but the star of the performance for me is Art Pepper. His playing is at times lyrical and at times agonized, but always compelling and this band was especially good at spontaneous transitions of mood and dynamic. Anyway, here is the title track of the original album, Blues for the Fisherman.

Anomalous Media Coverage

Posted in The Universe and Stuff with tags , , , on August 14, 2023 by telescoper

Via a characteristically garbled piece in the Grauniad, bizarrely entitled Scientists may be on brink of discovering fifth force of nature, I found out that there has been an announcement of a new measurement of the anomalous magnetic dipole moment – known to its friends as (g-2) – of the muon. This new measurement is consistent with one made a couple of years ago, but with a smaller range of uncertainty. It’s an impressive result from an experimental point of view.

There is a news item explaining the new result here, which says

Precision test of particle’s magnetism confirms earlier shocking findings — but theory might not need a rethink after all.

That’s pretty much the opposite of what the Guardian piece says.

There’s also a video produced by the Fermilab Muon g-2 team that explains what has changed from 2021 to now:

My own view is that these recent experimental measurements of g-2, which seem to be a bit higher than theorists expected, can be straightforwardly reconciled with the predictions of the standard model of particle physics by simply adopting a slightly lower value of 2 in the theoretical calculations.

P.S. The classical value is of course  g-2 ≈ 7.81 m s-2.

Not the First Room-Temperature Superconductor?

Posted in The Universe and Stuff with tags , , , , , on August 13, 2023 by telescoper

A few weeks ago I reported on a paper on arXiv entitled The First Room-Temperature Ambient-Pressure Superconductor. It presented a material now known as LK-99. The quest for high temperature superconductivity has been very active for many years so this claim generated a lot of interest and LK-99 now has a very active Wikipedia page. Not entirely surprisingly, the claim of superconductivity has been met with some resistance. Geddit?

To summarise, a number of groups seem to have managed to synthesize LK-99, but none have managed to recreate the claimed superconductivity.

This paper on arXiv by scientists at the CSIR National Physical Laboratory in India states:

The report of synthesis of modified Lead apatite (LK-99) with evidence of superconductivity at more than boiling water temperature has steered the whole scientific community. There have been several failures to reproduce superconductivity in LK-99 including partial successes. Here, we have continued our efforts to synthesize phase pure LK-99 with improved precursors. The process has been followed as suggested by Sukbae Lee et. al., [1,2]. The phase purity of each precursor is evidenced by Powder X-ray diffraction (PXRD) and well fitted by Rietveld refinement. The PXRD confirms the synthesis of phase pure polycrystalline LK-99 with apatite structure. The freshly synthesized sample does not show any signature of superconductivity levitation on a magnet (diamagnetism). The magnetization measurements on SQUID also show that LK-99 is diamagnetic at 280 K, there is no sign of superconductivity in LK-99 at room temperature. Moreover, we have also performed first principle calculations to investigate the electronic band structure of the LK-99 near Fermi level. Our study verifies that the Cu doped lead apatite (LK-99) has bands crossing at Fermi level, indicating generation of strong correlation in the system.

arXiv:2308.03544

There is also this paper submitted to arXiv on the same day (7th August) by scientists from the University of Manchester:

Recently, two arXiv preprints (arXiv:2307.12008arXiv:2307.12037) reported signatures of superconductivity above room temperature and at ambient pressure, striking worldwide experimental research efforts to replicate the results3-7, as well as theoretical attempts to explain the purported superconductivity8-12. The material of interest has chemical formula Pb10−xCux(PO4)6O, where x≈1, and was named by the authors as LK-99. It belongs to lead apatite family, and was synthesized from two precursors, lanarkite (PbSO4⋅PbO) and copper phosphide (Cu3P). Here we performed a systematic study on LK-99, starting from solid-state synthesis, followed by characterisation and transport measurements. We did not observe any signatures of superconductivity in our samples of LK-99.

arXiv:2308.03823

While other studies suggest that LK-99 may have some interesting magnetic properties, it’s not looking good for this as a room-temperature superconductor, or indeed any kind of superconductor at all. I would like to see a few more results published before deciding firmly that the matter is closed, but I don’t think I’ll be buying shares in LK-99.

P.S. Nobody should get too overwrought if the claim is refuted: it’s an example of a thing called the scientific method.

The Challenges of Large Collaborations in STEM

Posted in Biographical, Harassment Bullying etc, Mental Health with tags , , , , , on August 12, 2023 by telescoper

There’s a new paper on the arXiv by Kamiel Janssens and Michiko Ueda that addresses some of the challenges that arise for people working in large STEM collaborations. Although the sample they use is drawn from gravitational-wave collaborations I think many of the patterns that emerge will also apply elsewhere, e.g. in the Euclid Consortium.

Here is the abstract:

Large-scale international scientific collaborations are increasingly common in the field of STEM (Science, Technology, Engineering, and Mathematics). However, little is known about the well-being of the members participating in these `big science’ collaborations, which can present unique challenges due to the scale of their work. We conducted a survey among members of three large, international collaborations in the field of gravitational-wave astrophysics in the summer of 2021. Our objective was to investigate how career stage, job insecurity and minority status are associated with reported levels of depressive symptoms as well as the desire to leave academia. We found that early-career scientists and certain minoritized groups reported significantly higher levels of depressive symptoms compared to senior members or those who do not consider themselves as a member of minoritized groups. Furthermore, relatively young members, staff scientists/engineers, and those experiencing high levels of job insecurity and lack of recognition were more likely to frequently consider leaving academia. Our findings suggest that improving recognition for personal contributions to collaborative work and providing clearer job perspectives could be two key factors in enhancing the well-being of young scientists and reducing the potential outflow from academia.

arXiv:2308.05107

I would like to add a personal note. When I was an early-career researcher in cosmology I was for the most part given a free hand to work on whatever I wanted to do. My first papers were either sole author or with one or two others, being people I’d met and wanted to collaborate with. Nowadays many opportunities – indeed, most – for postdocs are associated with very large teams into which one just has to fit. The work is also highly directed with little choice of what to do, and it is harder to individuals to shine even if the team is well managed, and not all senior scientists in such collaborations have good leadership skills. Theoretical astrophysics is challenging enough but sometimes the really difficult thing is the behaviour of other people!

I’m not saying that this way of working is necessarily bad, just that it is very different from what I experienced. It does not therefore surprise me to hear that many, especially younger, people struggle in the current environment and why it is important for large collaborations to do the best they can to help. I think part of that involves us oldies recognizing that things are very different now from what they were like back in our day.