Peter Coles 🏳️‍🌈 🏳️‍⚧️

Black Holes, Hawking Radiation (and AI…) It seems to be a common misapprehension that the energy released by the supermassive black holes in, for example, active galactic nuclei is in the form of Hawking radiation. It isn't. Hawking radiation is only significant for black holes of very low mass. The radiation produced around supermassive black holes is due to the extremely high density and temperate of matter falling into the black hole through an accretion disk not due to the evaporation of the black hole itself.

Black Holes, Hawking Radiation (and AI…)

It seems to be a common misapprehension that the energy released by the supermassive black holes in, for example, active galactic nuclei is in the form of Hawking radiation. It isn't. Hawking radiation is only significant for black holes of very low mass.…

I have a name for people like her too...

Has it actually stopped raining, or is it some kind of a trap?

X axes European Commission’s ad account after €120M EU fine Nikita Bier, X’s head of product, accused the EU executive of trying to amplify its own social media post about the fine on X by trying “to take advantage of an exploit in our Ad Composer.”…

The true scandal here is that the @ec.europa.eu has an advertising account on X. Why are our taxes used to finance Nazi propaganda?
www.politico.eu/article/x-ax...

Black Holes, Hawking Radiation (and AI…) It seems to be a common misapprehension that the energy released by the supermassive black holes in, for example, active galactic nuclei is in the form of Hawking radiation. It isn't. Hawking radiation is only significant for black holes of very low mass. The radiation produced around supermassive black holes is due to the extremely high density and temperate of matter falling into the black hole through an accretion disk not due to the evaporation of the black hole itself.

Black Holes, Hawking Radiation (and AI…)

It seems to be a common misapprehension that the energy released by the supermassive black holes in, for example, active galactic nuclei is in the form of Hawking radiation. It isn't. Hawking radiation is only significant for black holes of very low mass.…

I see that Michael Neser took five wickets today. He's yet another Australian cricketer who has flourished since he stepped up to the Big Time to play for Glamorgan...

#TheAshes #Ashes

I expect that for the next Test England's cricketers will be replaced by ChatGPT.

There was, however, a brief glimmer of proper cricket in the first session. Perhaps they could try batting like that again sometime?

I see that #TheAshes series is developing in a manner not necessarily to the advantage of #England.

#cricket #Ashes

If we are all really just Stardust, does that mean the Universe was created by Hoagy Carmichael?

YouTube video by Charles Dundas "And Death Shall Have No Dominion" by Dylan Thomas

youtu.be/JQHPZUwYM84?...

Former Dulwich pupil says Farage told him: ‘That’s the way back to Africa’ Exclusive: Yinka Bankole says he felt compelled to speak out after Reform leader’s attempts to ‘dismiss’ hurt of alleged targets

This Is the one that really struck home to me. A 17 tear old bullying a 9 year old. Indicates a deeply troubling personality www.theguardian.com/politics/202...

Taking compromising amounts of money from dubious characters without any regard for their long-term goals or hidden agendas.

Is Nigel Farage a Premier League football club?

It's more than two years since I set up @ojastro.bsky.social on Bluesky, but only today did I add a link to the profile from astro.theoj.org.

I am old and forgetful.

Absolutely Mike Murphy! #OccupiedTerritoriesBill

The fact of the matter is that cranberries just aren't very nice.

This evening's Midlands derby between #Leeds and #Liverpool proved to be quite entertaining.

#LEELIV

Mozart and Bruckner at the National Concert Hall I worried I might have to miss last night's concert by National Symphony Orchestra Ireland conducted by Anja Bihlmaier at the National Concert Hall. I bought the ticket some weeks ago and was looking forward to it, but I had been a bit unwell earlier in the week and didn't want to go only to cough all the way through, possibly infecting others on the way.

Mozart and Bruckner at the National Concert Hall

I worried I might have to miss last night's concert by National Symphony Orchestra Ireland conducted by Anja Bihlmaier at the National Concert Hall. I bought the ticket some weeks ago and was looking forward to it, but I had been a bit unwell…

Suppose - purely hypothetically of course - that a University decides to include in all emails sent through its email system a footer forbidding the recipient from sharing the contents with any third party.

What then happens to a press release sent out by the University's Communications Department?

Weekly Update from the Open Journal of Astrophysics – 06/12/2025 Since the last update we have published a further six papers, which brings the number in Volume 8 (2025) up to 190, and the total so far published by OJAp up to 425.

Weekly Update from the Open Journal of Astrophysics – 06/12/2025

Since the last update we have published a further six papers, which brings the number in Volume 8 (2025) up to 190, and the total so far published by OJAp up to 425.

England in a spot of bother down under...

#TheAshes #AUSvENG #SecondTest

Since I got home I've been trying to find out what Boris Giltburg played for his encore. I finally found it: Robert Schumann's Arabeske in C.

I've always felt that the name #LateLateToyShow implies something quite different from what it actually is...

I'm glad I went. It was great. And I didn't cough or sneeze once!

Every now and then I am reminded that there are actual Dads with actual Sons...

As well as Bruckner 9 we have Mozart's Piano Concerto No. 15, written when the composer was a grand old man of 28.

🤮

Viva Chair

Yesterday afternoon I acted as Chair of the viva voce examination for a PhD degree in the Department of Mathematics & Statistics at Maynooth University. I have done this once before at Maynooth, in the Department of Biology, but had to look back through my archive of blog posts to find…

(I brought a face mask...)