We reconsider the old problem of the dynamics of spontaneous symmetry breaking (SSB)
using 3D lattice simulations. We develop a theory of tachyonic preheating, which occurs due to …

We consider preheating in the theory 1 4 λ φ 4+ 1 2 g 2 φ 2 χ 2, where the classical oscillating
inflaton field φ (t) decays into χ particles and φ particles. The parametric resonance which …

In inflationary cosmology, the particles constituting the Universe are created after inflation in
the process of reheating due to their interaction with the oscillating inflaton field. In the …

Large scale structure introduces two different kinds of errors in the luminosity distance
estimates from standardizable candles such as supernovae Ia (SNe)—a Poissonian scatter for …

In inflationary cosmology, the particles constituting the universe are created after inflation
due to their interaction with moving inflaton field (s) in the process of preheating. In the …

We consider toy cosmological models in which a classical, homogeneous, spinor field
provides a dominant or sub-dominant contribution to the energy-momentum tensor of a flat …

A variety of observations indicate that the Universe is dominated by “dark energy” with
negative pressure, one possibility for which is a cosmological constant. If the dark energy is a …

ALE3D is a multi-physics numerical simulation software tool utilizing arbitrary-Lagrangian-
Eulerian (ALE) techniques. The code is written to address both two-dimensional (2D plane …

Boundary-layer flow over a concave wall is subject to the Görtler instability, which is typically
manifested in the form of counter-rotating pairs of stationary streamwise vortices. Regions of …

We consider the instability of fluctuations in an oscillating scalar field which obeys the sine-Gordon
equation. We present simple closed-form analytic solutions describing the parametric …