Archive for the The Universe and Stuff Category

Reflections on a Bigoted Lecturer

Posted in Biographical, LGBTQ+, The Universe and Stuff with tags , , , on June 29, 2018 by telescoper

I heard yesterday that the Department of Applied Mathematics at the University of Cambridge has employed a new lecturer, Dr Aron Wall, whose research speciality is Black Hole Thermodynamics. Dr Wall also runs a blog in which he expresses outspokenly homophobic views. Take this piece for example, which included bigoted generalisations such as:

…the notoriously promiscuous, reckless, and obscene lifestyle characteristic of the cultural venues of the gay community.

It sounds like he knows a lot about these places. Does he visit them often?

You can read the whole piece for yourself and decide what you think. As a gay man I found it thoroughly offensive, but what I think is not as important as what effect this person’s presence in the teaching staff will mean for any LGBT+ students at DAMTP. I hope Dr Wall enjoys the compulsory Equality and Diversity Training he will be required to undergo as a new member of staff and that he does not let his extremist beliefs interfere with his responsibility as a lecturer to treat all staff and students with the respect they deserve.

The news about the appointment of Dr Wall, and some of the reaction to it, caused me to reflect on a few related issues.

The first is that some people have said that Dr Wall’s private beliefs are his own business, as long as he is good at his job. I agree with that. However his beliefs are no longer private, as he has chosen to make them public. I think that makes a big difference. His views are known publicly, and that does not help to provide a welcoming environment for LGBT+ students (which I would have thought was part of his job). You might say that `It’s OK. Just keep him away from LGBT+ students’. That seems to me a pathetic response, no different from saying that its acceptable to employ a serial sexual harasser as long as you keep him away from female students. The duty of a member of academic staff is to the entire academic community (staff and students), not just the fraction of it that the staff member isn’t bigoted against.

The second point that occurred to me relates to freedom of speech. Every now and then in universities there arises something that causes tension between the freedom to express (possibly extreme) opinions and the requirement to treat colleagues and students with civility and respect. One view that I have heard expressed from senior members of staff is that if what a member of staff says is not unlawful then they should be allowed to say it, providing that does not involve inappropriate use of, e.g., university email by which it might be construed that what is being said is official rather than person.

I don’t agree with this view, for a number of reasons. The law relating to these issues is a bit of a mess, to be honest, but it does for example include provisions that outlaws the the use of language that harasses or intimidates. If someone uses that sort of language in the workplace then they should feel the force of the law as well as facing disciplinary action which, depending on the severity of the offence, could lead to dismissal.

But is that it? I don’t think so. The law should set a minimum standard for behaviour, but it is perfectly reasonable for any employer, institution, club or other organisation to stipulate its own code of conduct either as part of an employment contract or as a set of membership rules. You can be thrown out of a sports ground for behaviour that violates ground rules but falls short of being unlawful, and you should face disciplinary action if you violate the standards of the academic community too.

The last point is a bit more personal. I have mentioned before that I found the blog post I linked to above very offensive, but freedom of speech must include the freedom to offend and I respect his right to express his opinions through his blog just as I assert my right to respond here on mine. I do wonder, however, what the reaction would be if a university lecturer wrote a blog post expressing other forms of prejudice, such as racism, or a post mocking disabled people. In UK law sexual orientation is a protected characteristic alongside gender, race, marital status, etc. A good test is therefore to read an anti-gay piece by substituting `black’ or `female’ for `gay’ and working out if it would be offensive then. I think this one would. My own personal experience tells me that universities are far less likely to react to homophobic language than racist or sexist expressions.

Coincidentally, I today received full details of the programme of events for LGBT+ STEM Day at Cardiff University. Here is an extract:

We’re getting involved because LGBTQ people in Science, Technology, Engineering and Mathematics (STEM) still struggle to be themselves at work and in their careers.

A lot of careers and workplaces are challenging for LGBTQ people. If we don’t feel comfortable or safe to be ‘out’ at work, we spend every moment monitoring what we say and how we say it. That takes its toll on a person’s mental health.

LGBTQ people working in STEM fields with better representation of women, for example, are more open about who they are – and so, biologists are more likely than engineers to be ‘out’ to their colleagues.

International research is giving us a sense of the challenges. In the US, LGB students are more likely to drop out of STEM degrees.

A few people have said to me that events like LGBT+ STEM Day are unnecessary because there is no longer any prejudice. Of course you won’t see prejudice if you turn a blind eye to it, but it is very much still around though usually not so obvious as the example I have discussed.

Chaotic Clouds on Jupiter

Posted in The Universe and Stuff with tags , , on June 23, 2018 by telescoper

I’ve been too busy today with Open Day business to do a proper post so I thought I’d just share this marvellous image from NASA’s Juno Mission.

The picture is like an extraordinary work

of abstract art, but it’s scientifically fascinating too:

The region seen here is somewhat chaotic and turbulent, given the various swirling cloud formations. In general, the darker cloud material is deeper in Jupiter’s atmosphere, while bright cloud material is high. The bright clouds are most likely ammonia or ammonia and water, mixed with a sprinkling of unknown chemical ingredients.

Why the Universe is extremely overrated.

Posted in Television, The Universe and Stuff with tags , , , , , , on June 19, 2018 by telescoper

A few weeks I read an article in Physics Today which prompted me to revise and resubmit an old post I cobbled together in response to the BBC television series Wonders of the Universe in which I argued that the title of that programme suggests that the Universe is wonder-ful, or even, in a word which has cropped up in the series a few times, `awesome’.  When you think about it the Universe is not really `awesome at all’. In fact it’s extremely overrated.

Take this thing, for example:

 

This is an example of a galaxy (the Andromeda Nebula, M31, to be precise). We live in a similar object. Of course it looks quite pretty on the surface but, when you look at it with a physicist’s eye, such a galaxy is really not as great as it’s cracked up to be, as I shall now explain.

We live in a relatively crowded part of our galaxy on a small planet orbiting a fairly insignificant star called the Sun. Now you’ve got me started on the Sun. I know it supplies the Earth with all its energy, but it does the job pretty badly, all things considered because the Sun only radiates a fraction of a milliwatt per kilogram. By comparison a human being radiates more than one watt per kilogram. Pound for pound, that’s more than a thousand times as much energy as a star.

So,  in reality, stars are bloated, wasteful, inefficient and not even slightly awesome. They’re only noticeable because they’re big. And we all know that size shouldn’t really matter. In short, stars are extremely overrated.

But even in what purports to be an interesting neighbourhood of our Galaxy, the nearest star is 4.5 light years from the Sun. To get that in perspective, imagine the Sun is the size of a golfball. On the same scale, where is the nearest star?

The answer to that will probably surprise you, as it does my students when I give this example in lectures. The answer is, in fact, on the order of a thousand kilometres away. That’s the distance from Cardiff to, say, Munich. What a dull landscape our Galaxy possesses. In between one little golf ball in Wales and another one in Germany there’s nothing of any interest at all, just a featureless incomprehensible void not worthy of the most perfunctory second thought.

So galaxies aren’t dazzlingly beautiful jewels of the heavens. They’re flimsy, insubstantial things more like the cheap tat you can find on QVC. What’s worse is that they’re also full of a grubby mixture of soot and dust. Indeed, some are so filthy that you can hardly see any stars at all. Somebody needs to give the Universe a good clean. I suppose you just can’t get the help these days.

And then to the Physics Today piece I mentioned at the start of this article. I quote:

Star formation is stupendously inefficient. Take the Milky Way. Our galaxy contains about a billion solar masses of fresh gas available to form stars—and yet it produces only one solar mass of new stars a year.

Hopeless! What a waste of space a galaxy is! As well as being oversized, vacuous and rather dirty, one is also pretty useless at making the very things it is supposed to be good at! What galaxies clearly need is some sort of a productivity drive or perhaps a complete redesign using more efficient technology.

So stars are overrated and galaxies are overrated, but surely the Universe as a whole is impressive?

No. Think about the Big Bang. Well, I don’t need to go on about that because I’ve already posted about it. Suffice to say that the Big Bang wasn’t anywhere near as Big as you’ve been led to believe: the volume was between about 115 and 120 decibels. Quite loud, to be sure, but many rock concerts are louder. To be honest it’s a bit of an anti-climax. If I’d been in charge (and given sufficient funding) I would have put on something much more spectacular.

In any case the Big Bang happened a very long time ago. Since then the Universe has been expanding, the space between galaxies getting emptier and emptier so there’s now less than one atom per cubic metre, and cooling down to the point where its temperature is lower than three degrees above absolute zero.

The Universe is a cold, desolate and very empty place, lit by a few feeble stars and warmed only by the fading glow of the heat left over from when it was all so much younger and more exciting. Here and there amid the cosmic void a few galaxies are dotted about, like cheap and rather tatty ornaments. It’s as if we inhabit a shabby downmarket retirement home, warmed only by the feeble radiation given off by a puny electric fire as we occupy ourselves as best we can until Armageddon comes.

In my opinion the Universe would have worked out better had it been entirely empty, instead of being contaminated with such detritus. I agree with Tennessee Williams:

BRICK: “Well, they say nature hates a vacuum, Big Daddy.
BIG DADDY: “That’s what they say, but sometimes I think that a vacuum is a hell of a lot better than some of the stuff that nature replaces it with.”

So no, the Universe isn’t wonderful. Not at all. In fact, it’s basically a bit rubbish. Again, it’s only superficially impressive because it’s quite large, and it doesn’t do to be impressed by things just because they are large. That would be vulgar.

Digression: I just remembered a story about a loudmouthed Texan who owned a big ranch and who was visiting the English countryside on holiday. Chatting to locals in the village pub he boasted that it took him several days to drive around his ranch. A farmer replied “Yes. I used to have a car like that.”

Ultimately, however, the fact is that whatever we think about the Universe and how badly constructed it it, we’re stuck with it. Just like the trains, the government and the weather. There’s nothing we can do about it, so we might as grin and bear it.

It’s being so cheerful that helps keep me going.

 

Euclid 2018: Day 3

Posted in Biographical, Euclid, The Universe and Stuff with tags , , on June 14, 2018 by telescoper

It’s the morning after the conference dinner the night before, so as Day 4 of the Euclid Consortium meeting gets under way I’ve just got the time and bandwidth to do a brief post about the events of yesterday. First of all, the conference photo arrived and is shown above. You’d be hard pressed to spot me in it, as there are a lot of people in it (and bear in mind that only about a quarter of the membership of the Euclid Consortium are actually present here in Bonn).

Yesterday I went to splinter meetings related to the working groups on cross-correlating Euclid with cosmic microwave background data (morning) and clusters of galaxies (afternoon). The latter session produced the following diagram, which makes everything clear:

After the day’s work was done I took a walk down to the western bank of the Rhine (just about 15 minutes’ walk from my hotel), on the way to the conference dinner at the . Sadly, I didn’t see any Rhine Maidens or find any gold to make into a ring.

Anyway, the dinner was at the splendid Rhein Hotel Dreesen and I had the good fortune to sit with some Italian friends from way back – by which I mean over 20 years!

Fortunately I didn’t have far to go to get back to my hotel after the festivities!

Euclid2018: Highlights of Day 2

Posted in Biographical, Euclid, The Universe and Stuff with tags , , , on June 13, 2018 by telescoper

I’ve just had my breakfast so I thought I’d do a quick post before the start of play at Day 3 of the 2018 Euclid Consortium Meeting in Bonn.

Day 2 was largely devoted to updates from the various Science Working Groups, but there was also an important presentation from Jason Rhodes about WFIRST, which is in some ways a rival to Euclid, or perhaps a complementary mission depending on how you look at it.


There was dismay in the global astronomy community last year when Donald Trump proposed taking the axe to WFIRST but it was good to hear that Congress not only reversed his decision but granted it additional funds over and above the original request.

Among the SWG updates was one by Alessandra Silvestri from the Theory Working Group concentrating on how Euclid could be used to test cosmology beyond the standard model. She focussed quite a lot on Horndeski Gravity, which is the most general four-dimensional scalar-tensor theory that leads to equations of motion that have the form of second-order differential equations.

Towards the end of the day there was a session devoted to the award of the Euclid Star Prizes.

The individual awards went to Micaela Bagley, Carmelita Carbone, Teake Nutma, Bertrand Morin, and Stefanie Wachter; more details on the winners and the awards they won will be posted here. The team award was given to the Flagship simulation team. Coincidentally, I posted about the Flagship simulations last year. Much of the preparation for Euclid would be impossible without these simulations, and the award of a prize to the team is very well justified.

The day finished with short talks from each of the prizewinners. That brought to the end two days of plenary sessions in the big hall of the Stadthalle. The next two days will be the `Splinter sessions’ which are held in parallel.

Oh, and one other thing: the 2019 Euclid Consortium Meeting will be held in Helsinki from June 4-7. Looks like I’ll be spending my birthday in Finland next year!

P.S. Previous Euclid Consortium meetings were: Bologna (2011);  Copenhagen (2012); Leiden (2013); Marseille (2014);  Lausanne (2015); Lisbon (2016); and London (2017).

Bad Godesberg Goody Bag

Posted in Biographical, The Universe and Stuff with tags , , , , on June 12, 2018 by telescoper

So here I am, then, at the start of Day 2 of Euclid 2018 in Bad Godesberg. The morning session contains a number of talks giving updates from the various Science Working Groups related to Euclid. After yesterday’s talks had finished I checked into my hotel which is nice, and then headed off via the Stadtbahn (local underground system) to a pleasant reception of drinks and nibbles in the University of Bonn. I’m very impressed with the local public transport, by the way. With my hotel booking I received a pass giving free unlimited on all buses, trams, overground and underground trains in the area. I’ll post more about the meeting later if I get time, but in the meantime I thought I’d show the contents of the conference Goody Bag: I’ve got quite a collection of conference bags that I’ve accumulated over the years, but this is the first one I’ve got that’s a lurid green colour. There’s a mug and a bag of Haribo sweets (which, I’m told, originate in Bonn). There is also a book which I looked at last night. I found it rather lacking in both plot and character development, but that is largely attributable to the fact that all the pages are blank. The final item, which I originally thought was some form of specimen jar, turns out to be a glass for Kölsch, a kind of beer brewed in Cologne.

 

News from Euclid 2018

Posted in Biographical, Euclid, The Universe and Stuff on June 11, 2018 by telescoper

At the second attempt I managed to check in for my flight to Cologne (which is apparently near a place called) en route to Bonn for the Euclid 2018 Consortium Meeting.

I was mightily relieved when a plane actually arrived this time.

We got to our destination just about on time. I bumped into fellow Euclidean Tom Kitching in the airport and we made it to the conference venue in time for a spot of lunch, after which the afternoon session was kicked off by Mark Cropper:

I missed the morning session, during which the most important piece of news was an official announcement that the launch date of Euclid has been moved back from 2020 until 2022. This was not unexpected, and is largely driven by problems with on-board electronic system, but it will obviously impact the timetable of the mission significantly.

Since the flight of Euclid will be delayed for two years, I wonder which hotel it will be staying in at ESA’s expense?

History of astronomy – reading the classics

Posted in History, The Universe and Stuff on June 7, 2018 by telescoper

I’m sharing this excellent blog post here on this blog for the edification and benefit of anyone interested in the history of astronomy as it contains a really useful list of references and comments related thereto!

thonyc's avatarThe Renaissance Mathematicus

Most non-specialists get their knowledge of the history of astronomy from general surveys of the subject or from even more general surveys of the history of science. The information contained in these on Ptolemaeus, Copernicus and the other boys in the history of astronomy band is often from secondary if not tertiary or even quaternary sources and as a result also often inaccurate if not completely false. The solution to this problem is of course to read the originals but not all of us are blessed with the linguistic abilities necessary to tackle second century Greek or Early Modern Latin, to say nothing of Galileo’s seventeenth century Tuscan. However, the current scholar interested in the classical texts from the history of astronomy is blessed with modern, annotated English translations of these and in this post I want to briefly present these and some secondary literature to assist in understanding them.

View original post 1,650 more words

A Mini-Introduction To Information Theory

Posted in The Universe and Stuff with tags , , , on June 5, 2018 by telescoper

The last link to an arXiv paper I posted here seems to have proved rather popular so here’s another that I think is well worth reading, this time by Ed Witten:

This article consists of a very short introduction to classical and quantum information theory. Basic properties of the classical Shannon entropy and the quantum von Neumann entropy are described, along with related concepts such as classical and quantum relative entropy, conditional entropy, and mutual information. A few more detailed topics are considered in the quantum case.

It’s not really `very short’ as it is nearly 40 pages long, but it does tackle a very big topic so I won’t quibble about that. You can download a PDF of the full paper here.

As always, comments are welcome through the comments box.

Does Physics need Philosophy (and vice versa)?

Posted in mathematics, The Universe and Stuff with tags , , on June 1, 2018 by telescoper

There’s a new paper on the arXiv by Carlo Rovelli entitled Physics Needs Philosophy. Philosophy Needs Physics. Here is the abstract:

Contrary to claims about the irrelevance of philosophy for science, I argue that philosophy has had, and still has, far more influence on physics than is commonly assumed. I maintain that the current anti-philosophical ideology has had damaging effects on the fertility of science. I also suggest that recent important empirical results, such as the detection of the Higgs particle and gravitational waves, and the failure to detect supersymmetry where many expected to find it, question the validity of certain philosophical assumptions common among theoretical physicists, inviting us to engage in a clearer philosophical reflection on scientific method.

Read and discuss.