Des Johnston
School of Mathematical and Computer Sciences
Maxwell Institute for Mathematical Sciences
Heriot-Watt University
Riccarton, Edinburgh EH14 4AS

Email: D.A.Johnston -at-
Office: CMS.04
Phone: +44 (0)131 4513255
Fax: +44 (0)131 4513249
Anti-Social Networks: Facebook, Twitter, Google+, Linkedin

e-prints: ArXiv, PURE
Bibliometrics: Google Scholar, Scopus, Mendeley, INSPIRE, ORCID, ResearchGate, ReseacherID

History: Maths department history

Peering into the sun at AIMS-Senegal 2017

Word cloud of research interests from using ArXiv

Once upon a time there was a nicer looking page but then all the style sheets got broken, so this is just an ugly page of lists on a pale grey background. However, you are a click away from a (slightly) better typeset Academic CV.

(Fairly) Current Research Interests: First Order Phase Transitions

    To some extent first-order phase transitions, that is transitions where there are discontinuities (latent heat and jumps in density or volume) have been the poor cousins of continuous transitions (where there are no such jumps) when it comes to numerical investigations, in spite of their prevalence in nature. There are various reasons for this - they are harder to simulate, for instance, and there appear to be fewer distinct quantities to measure for the first order transitions compared with continuous transitions.

    Recent research work along with Marco Mueller and Wolfhard Janke of Leipzig University has concentrated on several aspects of such first order transitions, in particular non-standard scaling behaviour at first order transitions when the low temperature phases are highly degenerate. As luck would have it, an old favorite - the Gonihedric Ising model - provides an example of this.

    Collaborations with colleagues at Coventry University and a visitor from Sri Lanka, R.P.K.C.M. Ranasinghe, have also investigated the phase transitions of Potts models with so-called invisible states, which display unexpected first order transitions, clarifying why they occur.

(Fairly) Recent Papers

Not So Current Research Interests: Nielsen Identities etc

What a preprint (my first...) used to look like in those prehistoric days before TeX (1984): Nielsen Identities in the 't Hooft Gauge

What a thesis (my only...) used to look like in those prehistoric days before TeX (1986): Gauge Properties and Convexity of the Effective Potential

Some Associated Published Papers

(Fairly) Recent Research Talks/Posters

Heriot-Watt Lectures

Heriot-Watt courses:
Maths Masterclass (schools talk):

AIMS Lectures

AIMS Ghana course:
AIMS South Africa course:
AIMS Senegal course:
  • March/April 2017, 2018: Quantum Mechanics and Quantum Computing

Various Links (Current)

Various Links (Historical)

(Fairly) Current Computers/Software

(Fairly) Current Tablets/Phones