# Frans Pretorius

Department of Physics | Office: Jadwin 262 |

Princeton University | Phone: 609 258 5858 |

Princeton, NJ 08544 | Email: fpretori@princeton.edu |

### Research Interests

My primary field of research is
Einstein's theory of general
relativity, and I specialize in numerical solution of the field
equations. Some of my current projects include: understanding the
nature of binary compact object (black hole and neutron star) mergers and
the
gravitational waves emitted during the collision, critical phenomena at
the threshold of gravitational collapse, the stability and dynamics of
higher dimensional black holes, and the nature of singularities that
generically appear in black hole and cosmological spacetimes. The
non-linearity and complexity of Einstein's equations make it
challenging to solve even numerically, and some portion of my
time is spent designing algorithms to efficiently
solve the equations in parallel on large computer clusters, and
software to manipulate and visualize the simulation results.

(a) | (b) | (c) | (d) | (e) | (f) | (g) |

Animations: (a) gravitational waves
and (b) lapse function from an equal mass binary black hole merger, (c)
apparent horizon embedding diagram of an unstable 5 dimensional black
string, (d) spherically symmetric and (e) prolate scalar field critical
collapse (in spherical polar coordinates with logarithmic radial and
time coordinates), the latter showing what may be an instability of the
scalar field threshold solution, (f) complex scalar field critical
collapse with angular momentum, prolate initial data, again exhibiting
similar unstable behavior as the real field (g) fluid rest-mass density
from a black hole-neutron star merger.

*Publications:*gr-qc listing

### Group

PersonnelTutorials, Projects, Software, Hardware, and other useful links

### Other Affiliations

Director, The Princeton Gravity Initiative

Distinguished Research Chair, Perimeter Institute

Simons Investigator

Associated Faculty in Department of Astrophysical Sciences, Department of Mathematics, and Program in Applied and Computational Mathematics, Princeton University

Associate, Canadian Institute for Advanced Research (CIfAR) Cosmology and Gravity Program

Simons Investigator

Associated Faculty in Department of Astrophysical Sciences, Department of Mathematics, and Program in Applied and Computational Mathematics, Princeton University

Associate, Canadian Institute for Advanced Research (CIfAR) Cosmology and Gravity Program

### Non-physics Links

local weather, NJ Transit, gym calender, Hawaii*Some of the material presented here is based upon work supported
in part by
the National Science Foundation*

*last updated: September 2018*