Archive for the Talks and Reviews Category

Cosmology beyond the Centenary of Λ

Posted in Talks and Reviews, The Universe and Stuff with tags , , on June 6, 2017 by telescoper

I didn’t expect to be doing anything other than listening to the talks and getting updated on the progress of the Euclid project at this meeting in London, but this morning I was roped in to introduce a public event tomorrow evening, called Cosmology beyond the Centenary of Λ:
ECSM_public_evening_event_2

 

This will take the form of a dialogue/discussion/debate between two leading cosmologists taking a `big picture’ view of the state of cosmology now and likely future developments. I’m sure it will be very friendly so I won’t use any form of language that suggests confrontation but it features, in the red corner, George Efstathiou of the University of Cambridge and, in the blue corner, Ofer Lahav of University College London.

Incidentally, I posted some months ago about the fact that this is the centenary year of Einstein’s introduction of the cosmological constant into the field equations of general relativity in this paper:

cosmo

I recommend anyone attending this Euclid meeting and indeed anyone with a passing interest in cosmology to read that paper – it’s very different from what you might probably imagine it to be!

The Cosmic Web – my Lincoln lecture slides…

Posted in Talks and Reviews, The Universe and Stuff with tags , on February 28, 2017 by telescoper

For those of you who are interested, here are the slides I used for the 1st Annual Robert Grosseteste Lecture on Astrophysics/Cosmology, given at the University of Lincoln on Thursday 23rd February 2017.

To Lincoln via Storm Doris

Posted in Biographical, Talks and Reviews, The Universe and Stuff with tags , on February 23, 2017 by telescoper

What a day!

This morning I set out from Cardiff to travel here to Lincoln for my public lecture. I took the 9.45 train via Birmingham which, after a change of trains in Nottingham, should have got me into Lincoln at 14.23, with plenty of time to have a look around and chat to people before the scheduled start of my talk at 18.00 hours.

That was the plan, but it omitted an important factor: Storm Doris. Fallen trees, broken down trains and general disorganisation meant that it took nine hours to get to Lincoln, even including getting a taxi from Nottingham because I missed my connection.

The strangest thing was that I never actually saw any particularly bad weather. In fact there was quite a lot of sunshine en route. All the chaos was caused elsewhere, apparently.

Anyway I finally turned up almost an hour late for my talk, but thankfully the audience had waited patiently so we went ahead with the lecture. I can’t say I was entirely unflustered after the journey but I hope at least some people found something of interest. There  certainly were some very nice and interesting questions at the end.

So now after a pleasant dinner with my host Andrei, I am safely installed in a charming guest house right beside Lincoln Cathedral. I certainly think I’ll sleep well tonight! 

Let’s hope my journey back to Cardiff is a bit less eventful. 

Cosmology: A Bayesian Perspective

Posted in Talks and Reviews, The Universe and Stuff with tags , , on July 14, 2016 by telescoper

For those of you who are interested, here are the slides I used in my invited talk at MaxEnt 2016 Maximum Entropy and Bayesian Methods in Science and Engineering, yesterday (13th July 2016) in Ghent (Belgium).

Cosmology at MaxEnt in Ghent

Posted in Talks and Reviews, The Universe and Stuff on March 3, 2016 by telescoper

It seems I am an invited speaker at MaxEnt 2016, the 36th Workshop on Bayesian Inference and Maximum Entropy Methods:

maxent

As well as talking about some of my own research I’ve been asked to include a bit of a review in my presentation. I haven’t quite decided what background stuff to include so thought a bit of crowdsourcing was called for. Anyone got any suggestions for important Bayesian/Maximum Entropy developments in cosmology?

If so, please offer them through the comments box!

P.S. Anyone know where Ghent is?

Deep in Thought

Posted in Biographical, Talks and Reviews on September 2, 2015 by telescoper

It’s very hard work attending scientific meetings. A colleague snapped this picture of me deep in thought at a fascinating talk this afternoon. It only looks like I was asleep.

2015-09-02%252017.08.18

Adventures with the One-Point Distribution Function

Posted in Bad Statistics, Books, Talks and Reviews, Talks and Reviews, The Universe and Stuff with tags , , on September 1, 2015 by telescoper

As I promised a few people, here are the slides I used for my talk earlier today at the meeting I am attending. Actually I was given only 30 minutes and used up a lot of that time on two things that haven’t got much to do with the title. One was a quiz to identify the six famous astronomers (or physicists) who had made important contributions to statistics (Slide 2) and the other was on some issues that arose during the discussion session yesterday evening. I didn’t in the end talk much about the topic given in the title, which was about how, despite learning a huge amount about certain aspects of galaxy clustering, we are still far from a good understanding of the one-point distribution of density fluctuations. I guess I’ll get the chance to talk more about that in the near future!

P.S. I think the six famous faces should be easy to identify, so there are no prizes but please feel free to guess through the comments box!