Geraint Harker

Who I am

I'm a Marie Curie fellow in the astrophysics group at University College London. I'm working mainly on studying the early Universe (the cosmic dawn and the epoch of reionization) with the highly-redshifted 21-cm line of hydrogen, and I'm interested more generally in statistics and inference problems in cosmology, as well as galaxy formation and the large-scale structure of the Universe.

Most of this work is as part of the LOFAR Epoch of Reionization (EoR) project, along with other UCL astrophysics group members Filipe Abdalla and Emma Chapman, and the rest of the LOFAR EoR team. I originally joined LOFAR as a postdoc at the Kapteyn Institute in Groningen, working with Saleem Zaroubi.

In between, I was a postdoc at the Center for Astrophysics and Space Astronomy, part of the University of Colorado Boulder, working with Jack Burns. I was part of the Lunar University Network for Astrophysics Research (LUNAR), a node of the NASA Lunar Science Institute (NLSI), which has since morphed into SSERVI. I mainly worked on foreground removal and signal extraction for sky-averaged 21-cm experiments to probe the cosmic dawn, in particular the Dark Ages Radio Explorer (DARE).

My PhD work, on galaxy formation and large scale structure, was conducted at Durham University under the supervision of Shaun Cole.

Before that, I studied maths at Fitzwilliam College, Cambridge, as an undergraduate and for Part III.

Everywhere I've been, I've played the fabulous game of contract bridge.

       Geraint in Croatia

 

Publications (see also on Google Scholar)

First-author papers

Co-authored papers

Conference Proceedings

 

Talks and posters

Talks

Invited

Contributed

Webinars
  • I delivered a LUNAR webinar in combination with a CASA/JILA Friday lunch talk. A recording is available online here. Or, you can just look at the slides. This was part of the LUNAR webinar series which I organized.

Posters

Internal talks and seminars

Lectures

 

Other documents

  • CV.
  • My PhD thesis is titled Connecting Galaxy Formation and Galaxy Clustering (see also scanned version at Durham University library). Chapters 2 and 4 are mostly reproduced in (or superseded by) the papers above, but Chapter 3 contains some results about the effect of environmental dependence on clustering statistics which can't be found elsewhere.
  • Notes on a limited implementation of Wp smoothing (Martin Mächler's page on the real deal may be found here).
  • Technical stuff (basically the appendix to my thesis) on rescaling N-body simulations.

 

Some results (not of general interest)


Geraint Harker
g.harker@ucl.ac.uk