Archive for September 28, 2016

Relocation, Relocation, Relocation

Posted in Biographical, Uncategorized with tags , on September 28, 2016 by telescoper

It seems my relocation to Cardiff is now more-or-less complete. The boxes of stuff from my old office at the University of Sussex arrived on Monday and I’ve been gradually stacking the books on the shelves in the rather large office to which I’ve been assigned:


In fact the removals people caught me on the hop, as they said they would phone me about an hour before they were due to arrive but didn’t do so. I was quite surprised to see all the boxes already there when I came in on Monday!

I was planning to have all this delivered a while ago to my house, because I didn’t think I was going to be given an office big enough to accommodate much of it. But then I had to delay the removal because my visit to hospital was put back so I wouldn’t have been able to receive it. Then I found out I had plenty of space at the University so I decided to have it all moved here.



I’ll be sharing this space with other members of the Data Innovation Research Institute, but for the time being I’m here on my own. The books make it look a bit more “lived-in” than it did when I arrived, though the mini-bar still hasn’t arrived yet.

It’s actually about four years since I was appointed to my previous job at Sussex; I moved there from Cardiff in early 2013. It’s a bit strange being back. I didn’t imagine when I started at Sussex that I would be returning relatively soon, but then I didn’t imagine a lot of the things that would lead to my resignation. From what I’ve heard, many of those things have been getting even worse since I left. I think I’ll keep a discussion of all that to myself, though, at least until I write my memoirs!




Formation of black holes in the dark [HEAP]

Posted in The Universe and Stuff with tags , on September 28, 2016 by telescoper

Given the title of my website I could hardly resist reblogging this arXiver post. I’m not an expert on Black Hole (BH) formation, so would be interested to hear opinions on how plausible is this idea that massive BHs might form via implosion rather than following a Supernova explosion.


A binary black hole (BBH) with components of 30-40 solar masses as the source of gravitational waves GW150914 can be formed from a relatively isolated binary of massive stars if both BHs are formed by implosion, namely, by complete or almost complete collapse of massive stars with no energetic SNe accompanied by a sudden mass loss that would significantly reduce the mass of the compact objects, and in most cases unbind the binary system. BBHs can also be formed by dynamical interactions in globular clusters, if the BHs are formed with no energetic SNe that would kick the BHs out from the cluster before BBH formation. Besides, if BHs of ~10 solar masses as in the source GW151226 are formed by implosion, the formation of BBHs would be prolific, and their fusion would make an important contribution to a stochastic gravitational wave background. Theoretical models set mass ranges for…

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Aurora over Reykjavik

Posted in Uncategorized with tags , on September 28, 2016 by telescoper

If you had been in Reykjavik on Sunday evening, 25th September 2016, this is what you would have seen:

Credit: Sævar Helgi Bragason & Snorri Þór Tryggvason.

Music by Wolfgang Amadeus Mozart (2nd Movement, Clarinet Concerto in A major K622).