**BSc (Hons), PhD **

**Professor of Mathematics and Chair of Department**

My teaching interests range from introductory statistics and linear algebra to 4th-year topology—with courses such as calculus and functions of complex variable in between. Most recently, I have been teaching:

- 62:171 Introduction to Statistics
- 62:172 Introduction to Statistical Inference
- 62:181 Calculus I
- 62:182 Linear Algebra I
- 62:363 Functions of a Complex Variable

For a whimsical view on mathematics see my Mathematics & Physics board on **Pinterest**.

My doctoral studies were at the University of Birmingham, in England, and were concerned with applying algebraic topology to a problem that arose from introducing quantum mechanical spin into nonlinear classical field theories. The ideas extend to Einstein’s theory of gravity, *General Relativity*, where the topological aspect comes from how light travels on the surface of a cone and from the fact that the axis of the cone can twist as one moves through spacetime—just as the rungs of a rope ladder can twist and point in various directions. In general relativity, these twists are called *kinks*. Their existence was first proposed by two Americans, David Finkelstein and Charles Misner.

In collaboration with Mount Saint Vincent University relativist, Tina Harriott, I studied the properties of relativistic kinks in a variety of spacetime dimensions, including the usual 3+1 (where 3 refers to the number of *space* dimensions, and 1 refers to the single* time* dimension) , and also simpler situations in 1+1 and 2+1 dimensions. Our work is summarized in our review paper titled ‘Degree of mapping for general relativistic kinks,’ *Nuovo Cimento B* **120**, 915–930 (2005).

One of the most exotic ideas in science—that of *time travel*—requires the light cone directions to undergo a twist that is in some ways similar to a *kink*. For a fun overview, see my article titled ‘Groundhogs, gravity, and loops through time,’ which appeared in the webzine *Ecclectica*.

Currently, my collaborator, Tina Harriott, and I are working on a new approach to general relativity that was pioneered by Ted Newman of the Pittsburgh relativity group.

In this approach, the usual spacetime metric is discarded and the theory is formulated in terms of the surfaces on which light itself is travelling. (Back to the idea of the light cones!). This way of doing general relativity is called the *Null Surface Formulation* (NSF).

We presented one of our solutions of the NSF equations at the conference *Relativity and Gravitation–100 Years after Einstein in Prague*, which was held in the Czech Republic. A printed version of the presentation is scheduled to appear in the proceedings. We have published a more general result titled ‘Solution for the null-surface formulation of general relativity in 2+1 dimensions,’ in the journal General Relativity and Gravitation, volume 46, issue 2 (2014).

Later, we found another, more complicated, solution that corresponded to a universe sourced by a scalar field (similar to the Higgs’ field). We published this solution under the title ‘Three-variable solution in the (2+1)-dimensional null-surface formulation,’ General Relativity and Gravitation, volume 50, issue 4 (2018).

We gave a talk on the above solution and on the (2+1)-dimensional null-surface formulation in general at the Joint Canada-Asia Pacific Conference on General Relativity and Relativistic Astrophysics, held at the University of Alberta in Edmonton, Alberta, Canada, 25–29 June 2018. See the photograph on the left.

Another solution soon followed. This one was the most complicated of the three and it described a spacetime with a curvature singularity, as would occur at the beginning of the universe or at the centre of a black hole. We published this solution under the title ‘Petrov type-N solution for the null-surface formulation in 2+1 dimensions,’ General Relativity and Gravitation, volume 51 (2019).

I am a member of the Winnipeg Institute for Theoretical Physics and of the International Society on General Relativity & Gravitation.

In the summer of 2024, during my recent visit to Halifax, Nova Scotia, my colleague, Tina Harriott, and I were interviewed by *A Conversation with a Scientist*—which is a new Science program that is becoming popular on the eastern seaboard. Notice how I am holding a light cone. (Don’t leave home without one!)

Hiking, travel, art, and anything connected with World War II, have always been my passion. I once combined all four when my wife and I visited the home—really a museum—of French sculptor Aristide Maillol. The old stone building sits in the foothills of the Pyrenees, astride the hiking trail that Spanish refugees used to escape the Franco regime in the late 1930s. In the early 1940s, it was used again by French refugees and Jewish families fleeing Nazi-occupied France.

Did I mention writing?

Brandon University has a creative writing program, and the city has been home to more than one creative writing club. The most recent was simply called *The Brandon Writers Club*.

I was a member of the latter, and on one occasion joined forces with an alumnus and a student from the general studies program to write a screenplay for a space-age TV mini-movie based loosely on *Macbeth*. The movie’s popularity fell short of *Star Wars*, but it aired throughout southwestern Manitoba and (because of the computer graphics) it saw several screenings as part of the first year course, 62.163 *Computers & the Modern World*.

As far as writing goes: I like* fiction*—both reading it and writing it. My latest short story **Coffee with Luna** struggles with the possibility of campus romance being derailed by social media. It was recently published by **Alfie Dog Limited** and is also available in paperback as part of the short story collection *Came as Me, Left as We*.

I am pursuing at least two longer projects. Of course, like every twenty-first-century writer, I have a **blog** and I am active on **Pinterest** and **twitter**, and **facebook** plus a **fb feature page**.

**Ph.D. University of Birmingham**

**B.Sc. (Hons) University of Birmingham**

**Brandon University**

Department of Mathematics and Computer Science

John R. Brodie Science Centre

270 18th Street

Brandon, Manitoba, Canada

R7A 6A9

**Phone:** (204) 727-7433

**Fax:** (204) 728-7346

**Email:** williams@brandonu.ca