Exploring Cosmic Origins with CORE: Cosmological Parameters [CEA]

Posted in The Universe and Stuff on January 3, 2017 by telescoper

Here’s an arXiver post I missed before Christmas about CORE – an exciting proposed for new CMB mission with a focus on polarization

arxiver's avatararXiver

http://arxiv.org/abs/1612.00021

We forecast the main cosmological parameter constraints achievable with the CORE space mission which is dedicated to mapping the polarisation of the Cosmic Microwave Background (CMB). CORE was recently submitted in response to ESA’s fifth call for medium-sized mission proposals (M5). Here we report the results from our pre-submission study of the impact of various instrumental options, in particular the telescope size and sensitivity level, and review the great, transformative potential of the mission as proposed. Specifically, we assess the impact on a broad range of fundamental parameters of our Universe as a function of the expected CMB characteristics, with other papers in the series focusing on controlling astrophysical and instrumental residual systematics. In this paper, we assume that only a few central CORE frequency channels are usable for our purpose, all others being devoted to the cleaning of astrophysical contaminants. On the theoretical side, we assume LCDM as…

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The problem with experts

Posted in Uncategorized on January 1, 2017 by telescoper

A thoughtful piece, well worth a reblog. Especially for the quote from Swift:

“Reasoning will never make a man correct an ill opinion, which by reasoning he never acquired.”

Jolyon Maugham's avatarWaiting for Godot

Among my New Year’s Eve companions was a bow-tied academic sociologist specialising in game theory.

The fun we had.

He told me about his use of the Monty Hall problem with his students. You probably know it but (from wikipedia):

Suppose you’re on a game show, and you’re given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what’s behind the doors, opens another door, say No. 3, which has a goat. He then says to you, “Do you want to pick door No. 2?” Is it to your advantage to switch your choice?

The answer, for those who don’t know the problem, is that by switching you double your chances of winning the car. And you can prove it mathematically.

When Marilyn vos Savant, who originally publicised the problem, gave that answer he was beseiged…

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Happy New Year!

Posted in Biographical on January 1, 2017 by telescoper

I was waiting for WordPress to publish the annual statistical summary page for this blog, like it has every year since I started here in 2008 but they seem to have discontinued that practice so I’ll just post the following message instead:

On this I occasion I am reminded of the following reassuring words from the diary of Tsar Nicholas II:

“The year 1916 was cursed; 1917 will surely be better!”

PS. I checked the blog stats myself. I got about 375,000 hits this year, just over a thousand a day, with just under 200,000 unique views. That’s a bit down on last year but that’s not surprsing as I’ve had more gaps in transmission than in previous years.

In 2016 there were 2427 comments on this blog, up about 10% on last year.

Altogether since this blog started in 2008, it has been viewed 2,958,117 times so I should get to 3 million by February!

Scientific Breakthrough of the Year 2016

Posted in The Universe and Stuff with tags , , on December 31, 2016 by telescoper

The year 2016 is almost over and there are just few hours left  until a 2017 begins. Looking back over the scientific discoveries of the last 12 months, I expect you think I would choose the discovery of gravitational waves by the LIGO consortium as my “Scientific Breakthrough of the Year”.

Wonderful achievement though that was, I have, after due reflection, decided to award the accolade to something else which has even more profound implications for the human race and its place in the Universe.

So without further ado, I hereby announce that the In The Dark award for Scientific Breakthrough Of The Year 2016 goes to Donald Trump,  for providing us at last with a definitive resolution of the Fermi Paradox.

 

I hope this clarifies the Apocalypse.

My 2016 Review of the Year

Posted in Uncategorized on December 30, 2016 by telescoper

Butetown’s Baltic Missions

Posted in Uncategorized on December 29, 2016 by telescoper

More on Cardiff history, this time the Baltic connections..

A Nordic Beacon

Posted in Uncategorized on December 29, 2016 by telescoper

Cardiff’s Norwegian connection. The Norwegian Church in Cardiff Bay is still an important landmark.

The Eastern Cross

Posted in Uncategorized on December 29, 2016 by telescoper

Fascinating insight into Cardiff’s international heritage..

Cyfarchion yr Ŵyl

Posted in Uncategorized on December 23, 2016 by telescoper

Well, Cardiff University is about to close down for the Christmas break, and I’ll also be going offline for a while from this afternoon.

I’d just like to take this opportunity to thank everyone who has taken the trouble to read, comment on, correct, and otherwise engage with this blog over the past year.

I can’t say it’s been a great year, but let’s cling to the hope that 2017 will be better than 2016 however unlikely that may seem at the moment.

Anyway, I hope you have a peaceful and enjoyable festive season!

Cyfarchion yr Ŵyl i chi gyd!

(That’s Welsh..)

 

The Young Charlie Parker plays Cherokee

Posted in Jazz with tags , , , , on December 22, 2016 by telescoper

I came across this rare treasure on Youtube and couldn’t resist sharing it here. It features a very young Charlie Parker, with the relatively unknown Efferge Ware on guitar and Little Phil Phillips on drums, playing the jazz standard Cherokee. This track was recorded in 1941 (when he was only 21 years old) in Bird’s home town of Kansas City. There is a gap in Charlie Parker’s discography between 1942 and 1944, which was when the American Musicians Union called a strike which led to a ban on all commercial recordings. When the ban game to an end Charlie Parker’s recordings with Dizzy Gillespie, Max Roach, Bud Powell and others unleashed the new harmonic language of bebop on the general public from New York City where it had been incubating during the strike. Parker’s style had evolved greatly in the intervening two years which no doubt made his playing sound all the more revolutionary when the ban was lifted. Although this version of Cherokee is to some extent a pre-bebop recording, you can hear the originality and beauty of Bird’s improvisation (complete with cheeky quotation from the “Popeye” theme) and it’s clear where he was heading.

The sophisticated and complex chord sequence of Cherokee (with its trademark ii-7–V7–I progressions) made it a firm favourite with bop musicians who tended to play it even faster than this earlier version.
In 1945, during what was arguably the first ever bebop recording session, Charlie Parker and Dizzy Gillespie decided to play a variation of Cherokee using the same chords but a different head. During the first take the musicians absent-mindedly played the theme from Cherokee at which point there was a cry of anguish from the control room uttered by a producer, who obviously had hoped that if they stayed off the actual tune he wouldn’t have to pay composer’s royalties. They started again, made another take, called it Ko-Ko, and it became one of the classics.

The 1941 version is valuable from a historical perspective but you don’t have to be interested in that to enjoy the wonderful fluidity and invention of Bird’s playing. Happy Christmas!