Admissions

Posted in Education with tags , , on February 11, 2011 by telescoper

Busy day today, necessitating an early start and a packed morning followed by a trip to the Big Smoke later on.

I thought I’d use my daily post to try a little experiment.

Yesterday I mentioned that applications to do Physics courses in the School of Physics & Astronomy at Cardiff University had increased enormously since last year. That prompted a couple of people to contact me, via email and Twitter, to admit that the same thing is happening at their institutions. With UCAS reporting that applications nationwide are up by only about 4%, I’m a bit confused as to what is going on.

I don’t know how many of my (1000+) daily readers work in UK universities, let alone which ones or whether they’re in a position to know what undergraduate applications are doing, but I would be very interested to hear whether this pattern is being repeated and whether it’s just physics that’s booming.

So, in lieu of a proper blog post for today, let me invite you to take part in a straw poll through the comments box. Where are you? What’s your subject? Are your applications up?

Do tell.


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The Bull’s-Eye Effect

Posted in The Universe and Stuff with tags , , , , on February 10, 2011 by telescoper

What a day.

For a start we had another manic UCAS admissions event. Applications to study physics here have rocketed, by more than 50% compared to last year, so it’s all hands on deck on days like this. Next weekend we have our first Saturday event of the year, and that promises to be even more popular. Still, it’s good to be busy. Without the students, we’d all be on Her Majesty’s Dole. At least some of our advertising is hitting the target.

After that it was back to the business of handing out 1st Semester examination results to my tutees – the Exam Board met yesterday but I skived off because I wasn’t involved in any exams last semester. Then a couple of undergraduate project meetings and a few matters related to postgraduate admissions that needed sorting out.

Finally, being a member of our esteemed Course Committee, I spent a little bit of time trying to assemble some new syllabuses. All our Physics (and Astrophysics) courses are changing next year, so this is a good chance to update the content and generally freshen up some of the material we teach.

In the course of thinking about this, I dug about among some of my old course notes from here there and everywhere, some of which I’ve kept on an old laptop. I chanced upon this cute little graphic, which I don’t think I’ve ever used in a lecture, but I thought I’d put it up here because it’s pretty. Sort of.

What it shows is a simulation of the large-scale structure of the Universe as might be mapped out using a galaxy redshift survey. The observer is in the centre of the picture (which a two-dimensional section through the Universe); the position of each galaxy is plotted by assuming that the apparent recession velocity (which is what a redshift survey measures) is related to the distance from the observer by Hubble’s Law:

V\simeq cz =H_0 R

where V  is the recession velocity, z  is the redshift, H_0 is Hubble’s constant  and R is the radial distance of the galaxy. However, this only applies exactly in a completely homogeneous Universe. In reality the various inhomogeneities (galaxies, clusters and superclusters) introduce distortions into the Hubble Law by generating peculiar velocities

V=H_0 R+ V_p

These distort the pattern seen in redshift space compared to real space. In real space the pattern is statistically isotropic, but in redshift space things look different along the line of sight from the observer compared to the directions at right angles as described quite nicely by this slide from a nice web page on redshift-space distortions.

There are two effects. One is that galaxies in tightly bound clusters have high-speed disordered motions. This means that each cluster is smeared out along the line of sight in redshift space, producing artefacts sometimes called “Fingers of God” – elongated structures that always point ominously at the observer. The other effect caused by large-scale coherent motions as matter flows into structures that are just forming, which squashes large-scale features in the redshift direction more-or-less opposite to the first.

These distortions don’t simply screw up our attempts to map the Universe. In fact they help us figure out how much matter might pulling the galaxies about. The number in the upper left of the first (animated) figure is the density parameter, \Omega. The higher this number is, the more matter there is to generate peculiar motions so the more pronounced the alteration; in a low density universe, real and redshift space look rather similar.

Notice that in the high-density universe the wall-like structures look thicker (owing to the large peculiar velocities within them) but that they are also larger than in the low-density universe. In a paper a while ago, together with Adrian Melott and others, we investigated  the dynamical origin of this phenomenon, which we called the Bull’s-Eye Effect because it forms prominent rings around the central point. It turns out to be Quite Interesting, because the merging of structures in redshift-space to create larger ones is entirely analogous the growth of structure by hierarchical merging in real space, and can be described by the same techniques. In effect, looking in redshift space gives you a sneak preview of how the stucture will subsequently evolve in real space…


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Our Place in the Universe

Posted in Television, The Universe and Stuff with tags , , , on February 9, 2011 by telescoper

I suspect I’m not the only person working in astronomy who found inspiration in Carl Sagan‘s epic TV series Cosmos, which was broadcast on British television when I was at Secondary School. Although the graphics are a bit dated now, and the language perhaps a bit florid for modern tastes, it has lost nothing of its splendour or profundity which is largely due to the charisma (and beautiful writing) of the presenter. It’s also in stark contrast to the simple-minded stuff served up by modern so-called science programmes. Here’s a little taster, which brought back happy memories to me, and I hope will do the same for fellow astronomers-of-a-certain-age.

We live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a Universe in which there are far more galaxies than people. We make our World significant by the courage of our questions, and by the depth of our answers.


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Children’s Song

Posted in Poetry with tags , , on February 9, 2011 by telescoper

We live in our own world,
A world that is too small
For you to stoop and enter
Even on hands and knees,
The adult subterfuge.
And though you probe and pry
With analytic eye,
And eavesdrop all our talk
With an amused look,
You cannot find the centre
Where we dance, where we play,
Where life is still asleep
Under the closed flower,
Under the smooth shell
Of eggs in the cupped nest
That mock the faded blue
Of your remoter heaven.

by R.S. Thomas (1913-2000)


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Hell hath no Fury…

Posted in Uncategorized with tags , on February 8, 2011 by telescoper

…like a little old lady with a handbag.

According to the BBC, one of the potential robbers was detained at the scene by members of the public and another three arrested by the Police shortly afterwards.

There are many things about this country that are in decline, but I firmly believe that our Little Old Ladies are the finest in the world.


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Decline and Fall

Posted in Education, Science Politics with tags , , , , , , , , on February 7, 2011 by telescoper

There’s an interesting discussion going on over at the e-Astronomer Andy Lawrence’s blog about truth, lies and astronomy grant funding.

The centrepiece of Andy’s post is the following graph, which is based on the most accurate available figures, showing how the number of postdoctoral research associate (postdoc) positions funded (first by SERC, then by PPARC, and then by STFC) in Astronomy has evolved over the last couple of decades, along with the number of permanent academic staff employed in UK universities.

To be precise it shows the number of new postdoc posts funded each year; since a postdoc position typically lasts 3 years, the total number of postdocs at ay time is roughly 3 times the number shown.

A few things are immediately clear. One is that both the number of academics and the number of postdocs grew steadily over the period covered by the graph, until 2006 after which there was a steep decline in the number of postdocs to a level substantially lower than the number funded in 2000. It’s not a coincidence that STFC was created in 2007.

The numerical growth of the UK astronomical community coincided with a  general expansion of the number of academics in the University resulting from the growth of funded student  numbers, but it also was also accompanied by improved access to large facilities. It also happened to be a time of high achievement by British astronomers, who played major roles in large projects that uncovered many deep secrets of the Universe, such as the existence of cosmological dark matter and dark energy.

Further details of the achievements of UK Astronomy over the last decade are given by our own Bill Frindall, Paul Crowther (see his page for references):

Astrophysics: UK space science (astrophysics) is ranked 2nd in citations (1999-2009), while UK physics ranks 5th internationally (1997-2007). According to Section 3 of the RCUK Review of Physics, combining these two categories places the UK 2nd to the USA overall – see bibliometric analysis. According to the IoP Survey of Academic Appointments in Physics, the UK astronomy academic community grew by 14 per cent in the 5 years leading up to 2008, compared with 12% for physics overall. From 2003/04 to 2007/08 physics departments expanded by 14%, equal to the wider UK average for all disciplines (see Sustainability of the UK research workforce report from RCUK. Undergraduate applications (admissions) to physics grew by 19% (11%) between 2002-2007 according to the DIUS Research Report 08-21. Astrophysics formed one of the case studies for a CSHE (UC Berkeley) science communication report from Jan 2010.

All this expansion didn’t come cheap, of course, but in my view  it was entirely justified on the grounds of scientific excellence. That used to count for something among the science policy makers, but those times seem to have gone. Not that the collateral benefits were negligible, as you can see from the above.

I’ll grant that it is not easy to establish what fraction of STFC’s budget should be spent on its “core” science and how much on managing facilities, but I think the balance has obviously gone way too far in one direction. I’m not the only one to think so. The probably deliberate decision to clobber astronomy grants flies in the face of the Institute of Physics Review of International Perceptions of UK Physics, carried out in 2005, which says

In summary, the state of astrophysics and solar system physics is relatively healthy at this time. Morale is good in the research community, particularly among the young, and wise investments seem to have been made since the 2000 review. Attention will need to be paid over the next five years to foster the astronomical observing community so as to recoup the investment in large telescope access.

STFC has done many things since its creation in 2007, but fostering the astronomical observing community is definitely not amongst them. Instead it has slashed the postdocs needed to collect, reduce and analyse the data coming from the facilities we paid so much to access.

I still don’t know what UK astronomy did to deserve the kick in the teeth it received in 2006 which precipitated the steep decline shown in the graph. Remember that this was before the credit crunch, which really took hold in 2008, so the cuts imposed STFC were clearly not in response to that. The message consistently being put out by the STFC Executive at the time was that it was spending “too much on science exploitation”, i.e. on doing science, and that a larger slice of the cake needed to be devoted to facilities and operations.

I suspect that the backlash against astronomy was led by senior figures in the Treasury who did not, still do not, and probably never will, see science as worth doing for its own sake rather than as a way of subsidising industry. I suspect also some senior figures in  UK Physics were not sorry to see the astronomical arrivistes get their comeuppance. I have encountered a number of distinguished physicists – usually of the condensed matter persuasion – who clearly resented the new wave of astronomers arriving in their departments. As long as they bring in more students, take on heavy teaching loads and don’t ask for expensive equipment then astronomers are fine, but what they do isn’t really proper physics is it?

But precisely who it was that was behind the strange demise of British astronomy is now not the main issue. The real question is what can be done about it starting from where we are now.

As things stand under the current STFC leadership, the grant line will stay roughly level in cash terms for the next three years. Adding in the effect of inflation that means the number of postdoc grants will slowly dwindle. Better than the last few years, but hardly grounds for celebration. The steady attrition of grant funding will eventually push many excellent university research groups over the edge and prematurely terminate many promising scientific careers.

STFC will be looking for a new Chief Executive very soon, and that raises at  the admittedly faint hope that some things might change for the better. What we need is a someone  who is prepared to champion fundamental research because he or she actually believes in it;  the  bedgrudging attempts of the current Chief Executive simply don’t convince in this regard.

Whether we get someone who fits the bill remains to be seen. If we don’t the future for UK astronomy looks very bleak.


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Number 8

Posted in Poetry, Rugby with tags , , , on February 6, 2011 by telescoper

I was tidying up this morning. During this rare episode of fastidiousness, I picked up a book of poetry called A Recipe for Water by Gillian Clarke. Among the lovely poems in this collection are a few inspired by Wales’ Grand Slam in the 2005 Six Nations Rugby. This is one of them, called Number 8. For those of you who aren’t rugby fans, the Number 8 is one of the forwards, the one who plays at the back of the scrum. In fact, it’s the only position that doesn’t have a name (other than “Number 8”); Numbers 1 and 3 are the props, 2 is the hooker, 4 & 5 are the locks, 6 and 7 are the flankers, 9 is the scrum-half, 10 the fly-half, 12 and 13 the inside- and outside-centres respectively, 11 and 14 the wingers and 15 the full-back. But the Number 8 is just the Number 8…

The poem is beautifully descriptive of the classic “pick-and-go” move from a set scrum during which, instead of channelling the ball to the scrum-half, the Number 8 unbinds, picks up the ball and surges forward (usually on the blind side, away from the backs in the three-quarter line).

And sometimes he’ll slip the knot of the scrum
with the ball on his palm, and run with it
hand on heart, out of the mud and bone,

the way a lovely muscle of river
will loosen the branchy tangle
that blocks its way,

and making a break for it flow,
sleek and dangerous
over the weir.


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Mystery Objects

Posted in Uncategorized on February 6, 2011 by telescoper

Yesterday one of my thousands of hundreds of dozens of several readers drew my attention to the fact that the following frightening vision appeared on my blog, courtesy of Google adverts.

These apparently edible objects are enough to give anyone nightmares, even without eating them. Does anyone know what on Earth they are? Are they indigenous to Newcastle? That wouldn’t surprise me..


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Soave sia il vento

Posted in Opera with tags , , on February 5, 2011 by telescoper

I don’t know what it’s been like down your way over the past couple of days but it’s been very windy around these parts. In fact I had to spend a couple of hours this afternoon repairing the damage done to my garden by a lump of a tree that fell down during Friday on account of the gales. If you’ve been affected by the stormy weather yourself I offer you this beautiful performance of the trio Soave sia il vento from Mozart’s Cosi fan Tutte as compensation.

Soave sia il vento,
Tranquilla sia l’onda,
Ed ogni elemento
Benigno risponda
Ai nostri  desir

Hoping I’ve got the subjunctives right I’ll translate this as

May the wind be gentle,
may the waves be calm,
and may every one of the elements
respond warmly
to our desire


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Portrait in Jazz

Posted in Jazz with tags , , , , , on February 5, 2011 by telescoper

At the end of a very busy week (during which I haven’t had much time to post), I decided to relax a bit this morning by listening to some old favourite Jazz CDs. When I got to this one, Portrait in Jazz, by the Bill Evans Trio I couldn’t understand why I hadn’t played it for so long. Surely I can’t have forgotten such a masterpiece? Anyway, I decided to write a post about this wonderful album. If it helps just one person discover this timeless music then it will have been worth it.

Bill Evans was one of the greatest, if not the greatest, Jazz pianists of all time. Among other things he practically created the modern piano trio, converting it from what it had been before – a pianist with bass and drum backing – to an equal partnership of these three very diverse instruments. To make the format work required partners of equal brilliance and compatibility and it was a while before Bill Evans found the right musicians to join him. Eventually he formed his first regular trio with the superb Scott La Faro on bass and Paul Motian on drums.

Innovations based on collective endeavour rarely succeed immediately, however. It took Evans and La Faro a long time, and two or three albums, before the latter was able to work out how his bass lines might comment on and blend with the piano improvisations instead of merely underpinning them. As their relationship changed and matured, Evans’ contributions actually became a bit more fragmented, so as to leave room for the bass to burst through, and increasingly their performances became like dialogues for piano and bass. Not that we should ignore the contribution of the drummer Paul Motian either; he does far more than just keep time in the way old-fashioned drummers when playing in a trio format.

But on Portrait in Jazz, their first album together, the accent was still predominantly on Evans the soloist and because his playing here is so entrancing one has to acknowledge that the eventual change of emphasis, however justified from an artistic point of view, was in some ways a mixed blessing.

What characterises this album is Evans’ lyricism and lightness of touch. He doesn’t try to overwhelm with virtuosic flourishes. Each phrase and indeed each note is finely shaded. Confidence in his timing enables him to make subtle use of the space between phrases and bring off the most dazzling rhythmic displacements, almost casually.

I’ve picked one track to give as an example. It wasn’t an easy choice but I think this – the standard Autumn Leaves – is the best track on the album. After the opening statement there’s a fine example of the interplay between the three members of the trio that was to become more prominent on later albums, but eventually (about two minutes) they kick into tempo and Evans launches into a stunningly beautiful solo improvisation in which every note sings with a sustained emotional intensity few, if any, pianists have ever achieved in any idiom. As Miles Davis once said of Bill Evans “He plays the piano the way it should be played.” Amen.