My academic biography follows.

### Qualifications

- BMath (Hons I) with science faculty medal, University of Newcastle, NSW, 2004
- Grad Dip Theol, Avondale College, 2009
- MSc (Physics), University of Queensland, 2013 —

### Authorship

- MacLaurin & Robertson, “Euler Characteristic in Odd Dimensions“,
*Gazette of the Australian Mathematical Society*30:4 (2003), p195–199. [Past issues only go back to 2004, currently] - MacLaurin, “Expanding Space, Redshifts, and Rigidity: Conceptual Issues in Cosmology”. MSc thesis, 2015, unpublished

Website: ** ColinsCosmos.com**, about general relativity and related topics

YouTube videos on general relativity: in production…

### Presentations

#### Conference talks

- 2015, 2nd Dec, “Galaxy Cable”, Melbourne, Australasian Society for General Relativity and Gravitation conference (ASGRG8)
- 2016, 8th July, “Static vs Falling: Time slicings of Schwarzschild black holes”, Vancouver, 16th Canadian Conference on General Relativity and Relativistic Astrophysics (CCGRRA16)

#### Conference poster

- 2016, 14th July, “Static vs Falling: Time slicings of Schwarzschild black holes”, New York City, 21st International Conference on General Relativity and Gravitation (GR21). Download PDF

#### Faculty

- 4th June 2015, Master of Science thesis overview, physics faculty at University of Queensland (UQ)
- 3rd Sep 2015, “Spatial Metric and Spaghettification”, astrophysics group (plus a few quantum physics visitors!) at the University of Queensland. I introduced the spatial metric aka spatial projector tensor, and used it to show that for a Schwarzschild black hole, the radial distance is
*dL*=1/*e**dr*. - 17th Dec 2015, “Galaxy Cable”, astrophysics group at University of Queensland. This was a recap of my first conference presentation on the same topic.
- 26th April 2016, “Black holes: Static vs Falling perspectives”, astrophysics group at UQ. The usual descriptions of radial distance, curvature of 3-space (Flamm’s paraboloid), time at infinity, etc. are based on the Schwarzschild coordinate perspective, which corresponds to static observers (
*r*>2*M*) or*e*=0 observers (*r*<2*M*). We get different measurements under generalised Gullstrand-Painlevé coordinates, which correspond to radially moving observers of various energy per mass*e*. - 12th September 2016, “Energy conservation in the universe”. I overviewed standard concepts about energy in relativity, for instance the stress-energy tensor knows nothing of a gravitational field, and total energy density is not localisable. However the “rigid quasilocal frames” formulation concludes that total energy
*is*conserved in relativity.

### Memberships

- Australasian Society for General Relativity and Gravitation (ASGRG)
- Astronomical Society of Australia (ASA)

### Training

Media presentation training: by Peter Buckley; Dwayne Jeffries

### Research

- General relativity: distance measurement, rigidity, the “stretching” of space, interpretation of redshifts