Archive for Cosmology

New Publication at the Open Journal of Astrophysics

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , on December 17, 2021 by telescoper

It’s nice to be able to announce another publication in the Open Journal of Astrophysics before the Christmas break. This one was published yesterday, actually, but I didn’t get time to post about it until just now. It is the 17th paper in Volume 4 (2021) and the 48th in all.

The latest publication is entitled Mapping Spatially Varying Additive Biases in Cosmic Shear Data and is written by Tom Kitching and Anurag Deshpande of the Mullard Space Science Laboratory (UCL) and Peter Taylor of the Jet Propulsion Laboratory (Caltech).

Here is a screen grab of the overlay which includes the abstract:

You can click on the image to make it larger should you wish to do so. You can find the arXiv version of the paper here. This is another one for the Cosmology and Nongalactic Astrophysics folder, which is the most popular category so far on the Open Journal of Astrophysics site.

P. S. Let me apologise for any inconvenience caused by a recent temporary outage on our Scholastica platform overnight between 16th & 17th December (US time). Normal service has now been restored.

Yet another Hubble Constant Update

Posted in The Universe and Stuff with tags , , , , on December 13, 2021 by telescoper

The latest contribution to the ongoing debate about the Hubble constant is a new paper by Adam Riess and collaborators which you can find on the arXiv here. The abstract reads:

As you can see, this group is doubling down up on a high value for the Hubble constant. This longstanding discrepancy gives me an excuse to post my longstanding opinion polls on the topic.

First, would you go for a “high” (73-ish) or “low” (68-ish) value:

Second, do you think the discrepancy or tension is anything to get excited or even tense about?

New Publication at the Open Journal of Astrophysics

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , on December 10, 2021 by telescoper

Time to announce yet another publication in the Open Journal of Astrophysics. This one was published yesterday, actually, but I didn’t get time to post about it until just now. It is the 16th paper in Volume 4 (2021) and the 47th in all.

The latest publication is entitled MCMC generation of cosmological fields far beyond Gaussianity and is written by Joey Braspenning and Elena Sellentin, both of Leiden University.

Here is a screen grab of the overlay which includes the abstract:

 

You can click on the image to make it larger should you wish to do so. You can find the arXiv version of the paper here. This is another one for the Cosmology and Nongalactic Astrophysics folder.

New Publication at the Open Journal of Astrophysics

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , on December 6, 2021 by telescoper

Time to announce yet another publication in the Open Journal of Astrophysics. This one is the 15th paper in Volume 4 (2021) and the 46th in all.

The latest publication is entitled  Interplanetary Dust as a Foreground for the LiteBIRD CMB Satellite Mission by Ken Ganga (Paris), Michele Maris (Trieste) and Mathieu Remazeilles (Santander) on behalf of the LiteBIRD collaboration. For information about the LiteBIRD mission see here.

Here is a screen grab of the overlay which includes the abstract:

You can find the paper on the Open Journal of Astrophysics site here and can also read it directly on the arXiv here.

Great News for Astrophysics & Cosmology at Maynooth!

Posted in Education, Maynooth, Science Politics, The Universe and Stuff with tags , , , on November 29, 2021 by telescoper

I couldn’t resist a quick post in reaction to the announcement by the Irish Government of ten new senior professorial positions under the Strategic Academic Leadership Initiative (SALI). I blogged about this scheme here. Among the positions just announced is a new Chair in Observational Astrophysics or Cosmology at Maynooth University. You can find Maynooth University’s official response to the announcement here.

The pandemic has played havoc with my sense of the passage of time so I had to check my documents folder to see when we completed the application. It turns out to have been January this year; the deadline was 29th January 2021. It has taken much longer than expected to for the outcome of this, the second, round to emerge but I suppose it’s better late than never!

The key rationale for these SALI positions is clear from the statement from Simon Harris, the Minister responsible for Third Level education in Ireland:

“Championing equality and diversity is one of the key goals of my department. The Senior Academic Leadership Initiative (SALI) is an important initiative aimed at advancing gender equality and the representation of women at the highest levels in our higher education institutions.

We have a particular problem with gender balance among the staff in Physics in Maynooth, especially un Theoretical Physics where all the permanent staff are male, and the lack of role models has a clear effect on our ability to encourage more female students to study with us.

The wider strategic case for this Chair revolves around broader developments in the area of astrophysics and cosmology at Maynooth. Currently there are two groups active in research in these areas, one in the Department of Experimental Physics (which is largely focussed on astronomical instrumentation) and the other, in the Department of Theoretical Physics, which is theoretical and computational. We want to promote closer collaboration between these research strands. The idea with the new position is that the holder will nucleate and lead a new research programme in the area between these existing groups as well as getting involved in outreach and public engagement.

The next step will be to launch a recruitment campaign, and more details will be available when the position is formally advertised. Let me just say for now that we intend the position to appeal not only to people who have their own observational programmes (e.g. using facilities provided by ESO, which Ireland recently joined) but also working on data from space missions, multi-messenger astrophysics, gravitational waves, and so on.

A Free Online Course in Cosmology from SISSA

Posted in Education, The Universe and Stuff with tags , , , , on November 25, 2021 by telescoper

The nice people at the Scuola Internazionale Superiore di Studi Avanzati (known to its friends as SISSA for short) have made available a free online course in cosmology. You can get all of it on Youtube.

The course comprises 16 professionally edited video-lectures delivered by lecturers of the SISSA Astrophysical and Cosmology and Astroparticle PhD Programs and some of their collaborators. I know some of the participants personally, including Paulo Salucci (who introduces the course though I haven’t met him in person for ages so it was nice to see him on camera.

Cosmology is a big subject, of course, and a short-ish course can’t cover everything so there is an emphasis on the research topics covered by SISSA scientists. I haven’t watched all the videos but those I have seen are pretty good. There are actually 17 videos in the playlist below but that includes a very short prelude to introduce the series. The others are between about 25 and 45 minutes in length so you probably don’t want to watch them all in one sitting!

Astrophysics & Cosmology Masterclass – The Video!

Posted in Education, Maynooth, The Universe and Stuff, YouTube with tags , , , on November 15, 2021 by telescoper

As promised here is the video recording of the Astrophysics & Cosmology Masterclass we held by Zoom last Friday.

That Was The Masterclass That Was

Posted in Education, Maynooth, The Universe and Stuff with tags , , , on November 12, 2021 by telescoper

This morning we did the Astrophysics and Cosmology Masterclass advertised here. I think it went quite well. Apparently we had over sixty schools registered – at least one in every County – about a 1,000 schoolkids altogether. Certainly there were lots and lots of questions, which is a good sign!

Here is a screen grab of part of the event. I didn’t realize my camera was a bit wonky!

In case anyone is interested here are the slides I used for my part of the talk:

I’ll post a recording of the whole event when it becomes available. Here is the recording of the workshop:

I had to leave before the end to go to a vector calculus lecture that was interrupted by the arrival of the Power Rangers, but that’s a different story…

Astrophysics & Cosmology Masterclass at Maynooth!

Posted in Biographical, Education, Maynooth, The Universe and Stuff with tags , , on November 4, 2021 by telescoper

Regular readers of the blog – both of them – may remember that, after a couple of postponements due to Covid-19, we presented a Masterclass in Astrophysics & Cosmology in Maynooth on March 25th 2021. Well, owing to popular demand, we’ve decided to do a re-run of the event on Friday 12th November 2021 ahead of the forthcoming CAO cycle. That’s a week tomorrow!

This will be a half-day virtual event via Zoom. It’s meant for school students in their 5th or 6th year of the Irish system. There might be a few of them or their teachers who see this blog so I thought I’d share the news here. You can find more information, including instructions on how to book a place, here.

Here is the updated official poster and the programme:

I’ll be talking about cosmology early on, while John Regan will talk about black holes. After the coffee break one of our PhD students will talk about why they wanted to study astrophysics. Then I’ll say something about our degree programmes for those students who might be interested in studying astrophysics and/or cosmology as part of a science course. We’ll finish with questions either about the science or the study!

I’m told that with a week still to go we already have over 750 science students based in schools from An Daingean to Arranmore Island, from Monaghan to Mayo and many counties in-between. Fortunately it is online so no travelling is involved. Unfortunately the participants don’t get to see the wonderful campus so here’s a gratuitous picture!

(And at 12 noon I don’t turn into a pumpkin but do have to run off to give a lecture on vector calculus..)

New Publication at the Open Journal of Astrophysics

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , on October 20, 2021 by telescoper

Time to announce another publication in the Open Journal of Astrophysics. This one is the 13th paper in Volume 4 (2021) and the 44th in all.

The latest publication is entitled  The LSST-DESC 3x2pt Tomography Optimization Challengeand is in the folder marked Instrumentation and Methods for Astrophysics, and is especially relevant for cosmology. The paper is led by Joe Zuntz of the University of Edinburgh, and there are 27 authors altogether, scattered across the globe, representing the LSST Dark Energy Science Collaboration.

Here is a screen grab of the overlay which includes the abstract:

You can find the paper on the Open Journal of Astrophysics site here and can also read it directly on the arXiv here.