One Page Research Interests
Completed Ph.D. 1998 with Dick Bond
Where the baryons are: (20 Mpc Box, Gas simulation with cooling)
I am investigating the high redshift universe, linking observations of
Lyman alpha clouds and
Large scale structure to theory
via SPH cosmological simulations.
I have strong interests in Galaxy Formation and MHD.
Recently I have been writing parallel hydrodynamics
Below is a 1.6 million particle gasdynamical super cluster simulation
in a universe with non-negligible vaccuum energy (Lambda). It took 35
days on an SGI Origin single processor. The box shown is 100 Mpc
(3x10^21 km) at z=0 and scaled to match the expansion at other
redshifts. The colours indicate density going from blue through green
and yellow to red at higher densities.
There are 4 major clusters and 13 smaller clusters
providing the contraints that define this region. In a Lambda
dominated universe cluster scale structures are present at z=1.5 (9
billion years ago). The parameters are Omega=0.35, Lambda=0.65 and
H0=70 km/s/Mpc. The redshifts shown are z=0, 0.1, 0.2, 0.5, 0.7, 1.0,
1.5, 3.0 and 8.0 corresponding to universe ages 13 (now), 11.8,
10.6, 8.1, 6.9, 5.5, 4.0, 2.0 and 0.6 billion years.
The background is a pseudo-ray traced image of a Lyman alpha
simulation. Shown is 5 Mpc box containing a few Lyman Alpha cloud
producing filaments and dwarf galaxies at z ~ 3. Higher Brightness
and opacity indicate higher density. Colours indicate temperature. Red
is 4,000,000K, Blue is 10,000K and purples represent intermediate
temperatures. Note that the cores of the knots are cool and thus
blue. Through the red hot gas around them they appear purple.