Academic bio

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 MSc thesis, 2015, unpublished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>2M) or e=0 observers (r<2M). 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