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Archive for May, 2014

More on the controversy over the BICEP2 results which claimed back in March to have discovered the B-mode polarisation due to gravitational waves in the very very early Universe. It seems others claim that BICEP2 did not correctly subtract the polarisation signal from dust in our own Milky Way.

Of Particular Significance

The controversy continues to develop over the interpretation of the results from BICEP2, the experiment that detected “B-mode” polarization in the sky, and was hailed as potential evidence of gravitational waves from the early universe, presumably generated during cosmic inflation. [Here’s some background info about the measurement].

Two papers this week (here and here) gave more detailed voice to the opinion that the BICEP2 team may have systematically underestimated the possible impact of polarized dust on their measurement.  These papers raise (but cannot settle) the question as to whether the B-mode polarization seen by BICEP2 might be entirely due to this dust — dust which is found throughout our galaxy, but is rather tenuous in the direction of the sky in which BICEP2 was looking.

I’m not going to drag my readers into the mud of the current discussion, both because it’s very technical and because it’s rather…

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Well, it would seem it was all a false alarm. For one of the best and most detailed explanations of why the false detection happened, check out this link.



20140530-200010-72010991.jpg

So, no spectacular supernova in Messier 31 yet. But we can live in hope.

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Today I thought I would share this beautiful song by R.E.M. “Everybody Hurts” was released as a single in 1993 and is from their 1992 album “Automatic For the People”. It reached number 7 in the Disunited Kingdom singles charts, and got to number 29 in the US.



R.E.M._-_Everybody_Hurts

The song was composed by all four of the band’s members, although the drummer Bill Berry wrote most of it. Here are the lyrics.


When your day is long
And the night, the night is yours alone
When you’re sure you’ve had enough
Of this life, well hang on

Don’t let yourself go
‘Cause everybody cries
And everybody hurts sometimes

Sometimes everything is wrong
Now it’s time to sing along
When your day is night alone (Hold on, hold on)
If you feel like letting go (Hold on)
If you think you’ve had too much
Of this life, well hang on

Everybody hurts
Take comfort in your friends
Everybody hurts
Don’t throw your hand, oh no

Don’t throw your hand
If you feel like you’re alone
No, no, no, you are not alone

If you’re on your own in this life
The days and nights are long
When you think you’ve had too much of this life to hang on

Well, everybody hurts sometimes
Everybody cries
Everybody hurts sometimes
And everybody hurts sometimes

So hold on, hold on
Hold on, hold on, hold on, hold on, hold on, hold on
Everybody hurts



Enjoy!



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A few days ago news broke that NASA’s gamma ray satellite called Swift had detected what was possibly a burst of powerful gamma rays coming from the Andromeda galaxy (Messier 31), the closest large galaxy to our Milky Way galaxy.



This is how NBC were covering the story as of Wednesday (28/05/2014)

This is how NBC were covering the story as of Wednesday (28/05/2014)



This story still seems to be in the early stages, so I have not been able to find too much information as of yet, except that it has happened. Further analysis should show whether it was really a gamma ray burst, or a high energy x-ray event. Also, within the next few days, we should be able to detect an optical counterpart to this event, which will enable us to not only determine its precise location but also determine the nature of the object which has caused the burst.



The story as it appears on the Universe Today website

The story as it appears on the Universe Today website



If it is a gamma ray burst then this is tremendously exciting. There has not been a gamma ray burst anywhere like as close to us anytime in the 50-odd years that we’ve had the ability to detect them. Gamma ray bursts are amongst the most energetic phenomena in the Universe, and are thought to be associated with such cataclysmic events such as the explosion of a star (a supernova), the formation of a black hole or the merging of e.g. two neutron stars. I am crossing my fingers that this event is related to a supernova, because if it is it should be close enough to see very easily with the naked eye. However, although I haven’t looked into this, it would seem to me that a supernova would also have led to a huge flux of neutrinos, and to my knowledge no such neutrino flux has been detected, so maybe it isn’t a supernova. We shall have to wait and see.

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At number 9 in Rolling Stone Magazine’s 10 best Bob Dylan songs is “Visions of Johanna” from his seminal 1966 album Blonde on Blonde. I blogged about this album and this song here, so I won’t add much here except to re-post the lyrics to this incredible song. You can find the link to this song on Bob Dylan’s official website here, which not only includes the lyrics but also various audio clips including the original studio version and a couple of live versions.



At number 9 in Rolling Stone Magazine's 10 greatest Bob Dylan songs is "Visions of Johanna"

At number 9 in Rolling Stone Magazine’s 10 greatest Bob Dylan songs is “Visions of Johanna”



Ain’t it just like the night to play tricks when you’re tryin’ to be so quiet?
We sit here stranded, though we’re all doin’ our best to deny it
And Louise holds a handful of rain, temptin’ you to defy it
Lights flicker from the opposite loft
In this room the heat pipes just cough
The country music station plays soft
But there’s nothing, really nothing to turn off
Just Louise and her lover so entwined
And these visions of Johanna that conquer my mind

In the empty lot where the ladies play blindman’s bluff with the key chain
And the all-night girls they whisper of escapades out on the “D” train
We can hear the night watchman click his flashlight
Ask himself if it’s him or them that’s really insane
Louise, she’s all right, she’s just near
She’s delicate and seems like the mirror
But she just makes it all too concise and too clear
That Johanna’s not here
The ghost of ’lectricity howls in the bones of her face
Where these visions of Johanna have now taken my place

Now, little boy lost, he takes himself so seriously
He brags of his misery, he likes to live dangerously
And when bringing her name up
He speaks of a farewell kiss to me
He’s sure got a lotta gall to be so useless and all
Muttering small talk at the wall while I’m in the hall
How can I explain?
Oh, it’s so hard to get on
And these visions of Johanna, they kept me up past the dawn

Inside the museums, Infinity goes up on trial
Voices echo this is what salvation must be like after a while
But Mona Lisa musta had the highway blues
You can tell by the way she smiles
See the primitive wallflower freeze
When the jelly-faced women all sneeze
Hear the one with the mustache say, “Jeeze
I can’t find my knees”
Oh, jewels and binoculars hang from the head of the mule
But these visions of Johanna, they make it all seem so cruel

The peddler now speaks to the countess who’s pretending to care for him
Sayin’, “Name me someone that’s not a parasite and I’ll go out and say a prayer for him”
But like Louise always says
“Ya can’t look at much, can ya man?”
As she, herself, prepares for him
And Madonna, she still has not showed
We see this empty cage now corrode
Where her cape of the stage once had flowed
The fiddler, he now steps to the road
He writes ev’rything’s been returned which was owed
On the back of the fish truck that loads
While my conscience explodes
The harmonicas play the skeleton keys and the rain
And these visions of Johanna are now all that remain


I have hunted down this live version of Visions which is from one of Dylan’s concerts in 1966, the tour where he was roundly booed during each performance when he played the second half of his act as an “electric” set, with a backing band, instead of his acoustic folk style that many of his fans had come to hear.






Enjoy!

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Dark Matter Debates

A very interesting summary of a recent conference on our current understanding of dark matter…….

Of Particular Significance

Last week I attended the Eighth Harvard-Smithsonian Conference on Theoretical Astrophysics, entitled “Debates on the Nature of Dark Matter”, which brought together leading figures in astronomy, astrophysics, cosmology and particle physics. Although there wasn’t much that was particularly new, it was a very useful conference for taking stock of where we are. I thought I’d bring you a few selected highlights that particularly caught my eye.

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Last week I stumbled across this wonderful link on the National Geographic website, a travel photography competition. There are dozens and dozens of wonderful photographs here, and I highly recommend following the link and spending a few tens of minutes taking a good browse, but here are (only) some of my favourites.



A mother's smile, Namibia

A mother’s smile, Namibia




Enjoy!





Which are your favourites?

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