Georgios Vernardos, Post-doc

I am mainly interested in data intensive scientific problems in physics and astrophysics.
I am working with large scale supercomputer simulations, data management, and interactive eTools and visualizations. I currently work on galaxy-galaxy lensing at the University of Groningen. I also continue to work on quasar microlensing (GERLUMPH). Both topics constitute data intensive problems of the upcoming survey era of astronomy.


Galaxy-Galaxy Lensing

Coming soon

Quasar Microlensing

A unique tool for probing the structure of quasar accretion discs is quasar microlensing: the effect of compact stellar-mass object close to the line of sight of a multiply imaged quasar. This is best described by a magnification map (see figure) of the quasar plane. Generating such maps is a computationally demanding task, to which Graphics Processing Units (GPU) come to the rescue. We are going to need thousands of such maps to study quasars in the survey era of astronomy. To this goal, I have been carrying out the GERLUMPH parameter survey.


In the peta-scale era of astronomy, the traditional picture of working with data locally on the desktop, or even on a supercomputer, will have to be abandoned. We will have to push the computations to the data. I have created a series of eTools for the GERLUMPH survey, one of which is the light curve tool (click on image).


The r-process of nucleosynthesis plays an important role in generating neutron rich elements in the Universe. Nevertheless, there is still a lot of uncertainty particularly regarding the astrophysical sites where it takes place. The movie (click to play) shows the abundance of the elements produced during a Supernova explosion. I produced this movie during my stay at ECT* in Trento, Italy, in spring of 2010.



Vohl, Fluke & Vernardos, Astronomy & Computing, 12, 200
 "Data compression in the petascale astronomy era: A GERLUMPH case study"
Vernardos, Fluke, Bate, Croton & Vohl, ApJSS, 217, 23
 "GERLUMPH Data Release 2: 2.5 billion simulated microlensing light curves"


Vernardos & Fluke, Astronomy & Computing, 6, 1
 "Adventures in the microlensing cloud: large datasets, eResearch tools, and GPUs"


Vernardos & Fluke, MNRAS, 434, 832
 "A new parameter space study of cosmological microlensing"


Kapteyn Astronomical Institute
University of Groningen
P.O. Box 800, 9700 AV Groningen, the Netherlands

Phone: +31 5 0363 4075
Email: gvernard at

Curriculum Vitae

A recent version of my CV can be found here.

(PDF format, updated on 23/04/2016)


The GERLUMPH project aims at preparing the theoretical ground for the data intensive era of quasar microlensing. The project is based at Swinburne University of Technology and its team members are:

Chris Fluke, Georgios Vernardos, Dany Vohl, Nick Bate, and Darren Croton

For (much) more information visit the GERLUMPH website: