Physics beyond the standard model. Constructing extensions of the standard model and examining their consequences for terrestrial experiments such as those at the LHC, for early universe cosmology, and for high-energy astrophysics. Current specific research interests are: Particle physics models of dark matter, especially "asymmetric" dark matter; The dynamics of, and models for, baryogenesis; Theories for generating neutrino masses and mixings, especially radiative neutrino mass models and their phenomenology; New approaches to constructing technically-natural theories; Extra-dimensional models using domain-wall branes.

Awards: Fellow of the Australian Academy of Science.

**Particle-antiparticle asymmetries from annihilations**

I. Baldes, N.F. Bell, K. Petraki and R.R. Volkas

Phys. Rev. Lett. 113 (2014) 181601

**Phenomenology of a very light scalar (100 MeV < $m_h$ < 10 GeV) mixing with the SM Higgs**

J.D. Clarke, R. Foot and R.R. Volkas

JHEP 1402 (2014) 123

**Poincare\'{e} protection for a natural electroweak scale**

R. Foot, A. Kobakhidze, K.L. McDonald and R.R. Volkas

Phys. Rev. D89 (2014) 11, 115018

**Testable two-loop radiative neutrino mass model based on an $LLQd^cQd^c$ effective operator**

P.W. Angel, Y. Cai, N.L. Rodd, M.A. Schmidt and R.R. Volkas

JHEP 1310 (2013) 118, Erratum-ibid. 1411 (2014) 092

**Solutions for intersecting domain walls with internal structure in six dimensions from a $Z_2 \times Z_2$-invariant action**

B.D. Callen and R.R. Volkas

Phys.Rev. D87 (2013) 11, 116002