Associate Professor

Physics Department

California Polytechnic State University

San Luis Obispo, CA 93407

Ph.D. Indiana University

B.A. Concordia College

My research involves theoretical studies
of fundamental spacetime symmetries.
Most of my attention has been directed
towards high-precision tests of Lorentz invariance,
the symmetry principle behind special relativity.
Lorentz invariance is the notion that
physics does not depend on the orientation
or velocity of a system.
So, Lorentz symmetry is the symmetry under
rotations (changes in orientation)
and boosts (changes in velocity).
A breakdown of these symmetries, Lorentz violation,
would point to new and interesting physics.
Background information Lorentz and CPT violation can be found
here.
Papers I have written can be found
here.

Below are some animations illustrating some of the consequences of Lorentz violation. Click on the image to view the animation. All animations are .mpg files. Most are designed to be played in loop mode.

Below are some graphical representation of the E-parity and B-parity components of some spin-weighted spherical harmonics up to j=2. Spin-weighted spherical harmonics are a form of tensor spherical harmonics. Tensor objects (e.g. scalars, vectors, matrices) can be written as sums of spin-weighted spherical harmonics in the same way a scalar function can be written in terms of the usual spherical harmonics. For more discussion, see

0E00 |
0E10 |
0E11 |
0E20 |
0E21 |
0E22 |

1E10 |
1E11 |
1E20 | 1E21 |
1E22 |

1B10 | 1B11 | 1B20 | 1B21 | 1B22 |

2E20 | 2E21 |
2E22 |

2B20 | 2B21 | 2B22 |