Non-Abelian gauge preheating

We study preheating in models where a scalar inflaton is directly coupled to a non-Abelian SU(2) gauge field. In particular, we examine m(2)phi(2) inflation with a conformal, dilatonlike coupling to the non-Abelian sector. We describe a numerical scheme that combines lattice gauge theory with standard finite difference methods applied to the scalar field. We show that a significant tachyonic instability allows for efficient preheating, which is parametrically suppressed by increasing the non-Abelian self-coupling. Additionally, we comment on the technical implementation of the evolution scheme and setting initial conditions.