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Non Sum Qualis Eram Bonae Sub Regno Cynarae

Posted in Poetry with tags , , , , on April 9, 2014 by telescoper

Frederick Delius is by no means my favourite composer, but when I heard yesterday of the death of the fine English baritone John Shirley-Quirk, I immediately decided to post this piece as a tribute. It’s a sumptuous setting, by Delius, of Ernest Dowson‘s sensual and languid poem Non Sum Qualis Eram Bonae Sub Regno Cynarae which is named after a phrase from Horace but is actually, obviously, about the poet’s obsession with a lost love. I probably shouldn’t mention that the lost love in question was an eleven year old girl and he was 24.  Dowson pursued her unsuccessfully for eight years. When eventually, at the age of 19, she married someone else he drank himself to death at the age of 32. Oscar Wilde said of Dowson:

Poor wounded wonderful fellow that he was, a tragic reproduction of all tragic poetry, like a symbol, or a scene. I hope bay leaves will be laid on his tomb and rue and myrtle too for he knew what love was.

Anyway, the music and words are beautifully woven together and also beautifully sung.  RIP John Shirley-Quirk.

Here’s the text of the poem

Last night, ah, yesternight, betwixt her lips and mine
There fell thy shadow, Cynara! thy breath was shed
Upon my soul between the kisses and the wine;
And I was desolate and sick of an old passion,
Yea, I was desolate and bowed my head:
I have been faithful to thee, Cynara! in my fashion.

All night upon mine heart I felt her warm heart beat,
Night-long within mine arms in love and sleep she lay;
Surely the kisses of her bought red mouth were sweet;
But I was desolate and sick of an old passion,
When I awoke and found the dawn was grey:
I have been faithful to thee, Cynara! in my fashion.

I have forgot much, Cynara! gone with the wind,
Flung roses, roses riotously with the throng,
Dancing, to put thy pale, lost lilies out of mind,
But I was desolate and sick of an old passion,
Yea, all the time, because the dance was long:
I have been faithful to thee, Cynara! in my fashion.

I cried for madder music and for stronger wine,
But when the feast is finished and the lamps expire,
Then falls thy shadow, Cynara! the night is thine;
And I am desolate and sick of an old passion,
Yea, hungry for the lips of my desire:
I have been faithful to thee, Cynara! in my fashion.

Galactic Loops as Sources of Polarized Emission

Posted in The Universe and Stuff with tags , , , , , on April 8, 2014 by telescoper

Since I seem to have established myself as an arch-sceptic concerning the cosmological interpretation of the the BICEP2 measurement of the polarization of the cosmic microwave background (CMB), I couldn’t resist posting a link to an interesting paper by Liu et al. that has just appeared on the arXiv.

The abstract is:

We investigate possible imprints of galactic foreground structures such as the `radio loops’ in the derived maps of the cosmic microwave background. Surprisingly there is evidence for these not only at radio frequencies through their synchrotron radiation, but also at microwave frequencies where emission by dust dominates. This suggests the mechanism is magnetic dipole radiation from dust grains enriched by metallic iron, or ferrimagnetic molecules. This new foreground we have identified is present at high galactic latitudes, and potentially dominates over the expected B-mode polarisation signal due to primordial gravitational waves from inflation.

The authors argue that foreground emission from our own Galaxy has not been fully subtracted from maps of the cosmic microwave background. This emission could result in significant contamination of the CMB polarization if it is associated with dust grains aligned with the Galaxy’s magnetic field.

I’m grateful to one of the authors of the paper, Philip Mertsch, for sending me this map of the Galactic Loops with the BICEP2 region superimposed on it, demonstrating that there is potential for a contribution…

bicep2_loops

 

 

This paper is likely to provoke quite a discussion, so I thought I’d suggest one possible way of testing it, namely by updating the analysis presented by myself and Patrick Dineen in 2003 with new data. Here’s the abstract of our old paper:

We present a diagnostic test of possible Galactic contamination of cosmic microwave background sky maps designed to provide an independent check on the methods used to compile these maps. The method involves a non-parametric measurement of cross-correlation between the Faraday rotation measure (RM) of extragalactic sources and the measured microwave signal at the same angular position. We argue that statistical properties of the observed distribution of rotation measures are consistent with a Galactic origin, an argument reinforced by a direct measurement of cross-correlation between dust, free-free and synchrotron foreground maps and RM values with the strongest correlation being for dust and free-free. We do not find any statistically compelling evidence for correlations between the RM values and the COBE DMR maps at any frequency, so there is no evidence of residual contamination in these CMB maps. On the other hand, there is a statistically significant correlation of RM with the preliminary WMAP individual frequency maps which remains significant in the Tegmark et al. Wiener-filtered map but not in the Internal Linear Combination map produced by the WMAP team.

The idea is that cross-correlating the CMB pattern with Faraday rotation measures should provide an independent diagnostic of the effect of magnetic fields. Our analysis was based on old CMB data, so there’s an interesting project to be done updating it with, e.g., Planck CMB data and a larger set of rotation measures. See the comment below for a reference to more recent work along these lines, but still not including Planck.

Anyway, this all goes to show that there’s one question you can always ask about an astrophysics result: have you considered the possible role of magnetic fields?

Death and Other Inconveniences

Posted in Biographical, Brighton with tags , , , on April 7, 2014 by telescoper

It would be an exaggeration to say that this has been a good day. It started in Cardiff when I got to the Central Station and discovered that my train was late. It was only 12 minutes late, in fact, which isn’t at all unsurprising for Late Western. Nevertheless I was a bit annoyed that the 12 minutes turned into 20 minutes and that the Train Manager never once offered an explanation or apology on the entire journey into Paddington.

I did eventually find out the reason for the initial delay via Twitter. Earlier there had been a “person hit by a train”. My irritation turned to deep sadness, at hearing yet again that coded message indicating a death by suicide.

Sitting on the train I remembered seeing fallen cherry blossom in Bute Park. The morning rain had brought it down. That would provide a much more poetic excuse for late running than the usual “leaves on the line”, a poignant reminder of our mortality and all that. I didn’t realize how apt that would turn out to be.

After arriving into Paddington I took the tube to Victoria and had only a short wait for a train to Brighton. All went well until we reached Gatwick Airport at which point we were held at a signal for some time. The train manager then announced that the train would be diverted via Lewes and would therefore be late. The reason? Unbelievably, another “person hit by a train”, this time near Hassocks. Two in one day. Grim.

The train reached Lewes but didn’t stop at a platform but up a branch line some distance from the station. The driver changed ends and we went through Lewes station again without stopping, this time on the branch line to Brighton. We then passed Falmer (my intended destination) without stopping too.

Soon we arrived in Brighton, and I had to get another, stopping, train back to Falmer. I got on the next one, which sat for 20 minutes without moving. Diversion of all the mainline trains onto the Lewes line was causing congestion. As time ticked away I was starting to worry I would miss my 5pm lecture. I decided to give up on the train, left the station and proceeded to take the Number 25 bus to Falmer from the nearest stop.

That turned out not to be a wise move. The bus managed to travel a few hundred yards only before the driver announced that the Lewes Road had been closed by the Police owing to an “incident” at the gyratory system beside Sainsbury’s. We sat on the bus for a while just south of the area that had been cordoned off and then the driver told us the inevitable news that the bus was terminating and we all had to get off.

The main bus garage lies on the Lewes Road just north of the gyratory system, so I thought there was a chance some buses might be operating the other side of the blockage. I went to investigate.

As I skirted round the police cordon I counted at least ten police cars scattered about, along with two large vans. Armed officers were swarming around, and some were on the top of the Sainsbury’s building. There was also a uniformed officer with a loud hailer. Apparently someone, apparently armed, was inside one of the nearby flats. I didn’t hang about to find out more.

There were no buses northbound that I could see, and by now it was pouring with rain. I couldn’t see any possibility of getting to campus with my luggage, so decided to give up and go to my flat. By now my phone battery was nearly flat so all I could so was leave quick messages on Twitter and Facebook, before it croaked, to say
I was cancelling my lecture.

As I write the incident at Lewes road appears to be continuing, but at least nobody seems to have been seriously hurt.

I’m of course very disappointed at having had to miss a lecture, and some other things I wanted to do this afternoon but the three events that impinged on my journey are of far greater consequence for the people affected than my own inconvenience. It’s no doubt been a rougher day than I can possibly imagine for a great many people today.

Stanzas – April 1814

Posted in Poetry with tags , on April 7, 2014 by telescoper

Away! the moor is dark beneath the moon,
Rapid clouds have drank the last pale beam of even:
Away! the gathering winds will call the darkness soon,
And profoundest midnight shroud the serene lights of heaven.

Pause not! The time is past! Every voice cries, Away!
Tempt not with one last tear thy friend’s ungentle mood:
Thy lover’s eye, so glazed and cold, dares not entreat thy stay:
Duty and dereliction guide thee back to solitude.

Away, away! to thy sad and silent home;
Pour bitter tears on its desolated hearth;
Watch the dim shades as like ghosts they go and come,
And complicate strange webs of melancholy mirth.

The leaves of wasted autumn woods shall float around thine head:
The blooms of dewy spring shall gleam beneath thy feet:
But thy soul or this world must fade in the frost that binds the dead,
Ere midnight’s frown and morning’s smile, ere thou and peace may meet.

The cloud shadows of midnight possess their own repose,
For the weary winds are silent, or the moon is in the deep:
Some respite to its turbulence unresting ocean knows;
Whatever moves, or toils, or grieves, hath its appointed sleep.

Thou in the grave shalt rest—yet till the phantoms flee
Which that house and heath and garden made dear to thee erewhile,
Thy remembrance, and repentance, and deep musings are not free
From the music of two voices and the light of one sweet smile.

by Percy Bysshe Shelley (1792-1822); posted to mark the 200th anniversary of the poem’s composition.

 

Jermain Jackman & Urban Cheesemaker complete Beard of Spring shortlist

Posted in Beards, Biographical with tags , on April 6, 2014 by telescoper

Well, wonders never cease! I’ve made it onto the ballot form for the 2014 Beard of the Year! I’m only in third place at the moment, though, and already a very long way behind the leader, Oliver Duff (whoever he is). Would you vote for me? Please. Pretty please!

kmflett's avatarKmflett's Blog

Beard Liberation Front
PRESS RELEASE 6th April
Contact Keith Flett 07803 167266

Jermain Jackman & Urban Cheesemaker complete Beard of Spring shortlist

The Beard Liberation Front, the network of beard wearers that campaigns against beardism, has said that the final list for the Beard of Spring 2014 Award is now complete with the winner of the Voice Jermain Jackman and urban cheesemaker Philip Wilton from Wildes Cheese.

Both men have distinguished chin beards and both come from north-east London- Jackman from Hackney and Wilton from Tottenham

The poll is now open and the winner will be announced on 19th April.
The Award, one of four seasonal hirsute accolades that lead to the Beard of the Year in December, celebrates the coming of Spring and the growth of beards new and old.

BLF Organiser Keith Flett said the list contains several names who have never been honoured because of their beard…

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Apostrophe Catastrophe…

Posted in Literature with tags , on April 6, 2014 by telescoper

..and a First Edition too!

Apostrophe

After the Chaos Ball

Posted in Biographical, Football on April 5, 2014 by telescoper

I’ve been taking it easy today, recovering from a late night which involved attending the Annual Ball of the Chaos Society (that’s the Cardiff University Physics and Astronomy staff-student society). It was a grand affair, held in the National Museum of Wales and beginning with a drinks reception among the splendid Impressionist paintings and sculptures and continuing downstairs with a dinner dance, as shown in the picture. A few of us older reprobates then adjourned to a bar for a nightcap or several, all of which left me nursing a hangover this morning, although it was nice to see so many familiar faces again.

I’d like to thank the Chaos Society for inviting me and also send my condolences to the new boss of my old Department, Matt Griffin, on Cardiff City’s home defeat by Crystal Palace this afternoon. It looks pretty certain now that Cardiff will be playing Brighton in the Championship next season..

P.S. In the interest of balance I should point out that Newcastle got thrashed too, 4-0 at home to Manchester United. Their poor run continues against teams from the Midlands.

Another Travelblog

Posted in Biographical on April 4, 2014 by telescoper

Once again I find myself on a Late Western train from Paddington to Cardiff. I was going to travel after work yesterday, but it was such a busy day that when I finished all I had to do about 6.30pm I was too tired to face the four-hour-plus journey. I hadn’t had time to stop for lunch either, so decided dinner in Brighton followed by an early night was a better plan.

Anyway so ends the penultimate week of teaching term; one final push and we’ll be into the Easter holidays, at which point I’ll actually be taking a short break myself, despite the apparently widespread belief that a Head of School is not allowed to take a holiday.

Twelve-week teaching terms are a hard slog, but on balance I much prefer not having to take a break part-way through, which tends to happen when Easter happens earlier in the year.

On Wednesday this week we had the termly meeting of Senate; next week there’s a cluster of end-of-term events, including two staff-student balls (one for Mathematics and one for Physics & Astronomy; naturally I have to attend both). There’s also our final UCAS Applicant Visit Day on Saturday 12th, which promises to be very busy especially if the weather stays fine…

This weekend, before all that, I’ll be relaxing in Cardiff and possibly recovering from the event I’ll be attending tonight at which I hope to see quite a few old friends. More of that anon, perhaps.

In the meantime, as the train trundles towards South Wales, I think I’ll have a short snooze. I hope I don’t miss my stop!

An Inspirational Photograph..

Posted in Biographical on April 3, 2014 by telescoper

Getting home and feeling a little jaded after a very long day, I saw this photograph and decided to post it here because I think it’s inspirational.

The picture shows a visiting group of A-level physics students being given a guided tour of the Sussex University campus by Daniel, one of our first-year Theoretical Physics students.

You can see Daniel on the right of the photograph, with the white stick. He’s blind.

A Problem of Capacitors

Posted in Cute Problems, The Universe and Stuff with tags , , on April 3, 2014 by telescoper

Time for another entry in the Cute Problems  category. I’ve been teaching a course module  in theoretical physics this term so here’s one that my students should find a doddle…

A spherical capacitor consists of an outer conducting sphere of fixed radius b and a concentric inner conducting sphere whose radius a can be varied. The space between the spheres is filled with air which has a breakdown electric field strength E0. What are the greatest achievable values for (i) the potential difference between the spheres, and (ii) the electrostatic energy stored in the capacitor?

Answers via the comments box please.