We review results of a numerical study of resonant inflaton decay in a wide range of realistic models and parameters. Wide enough parametric resonance can withstand the expansion of the Universe, though account for the expansion is very important for determining precisely how wide it should be. For example, the effective production of particles with mass ten times that of the inflaton requires ...

Abstract. A brief overview of selected topics in the theory and phenomenology of neutrino oscillations is given. These include: oscillations in vacuum and in matter; phenomenology of 3-flavour neutrino oscillations and effective 2-flavour approximations; CP and T violation in neutrino oscillations in vacuum and in matter; matter effects on νμ ↔ ντ oscillations; parametric resonance in neutrino ...

If one changes the control parameter of a chaotic system proportionally to the distance between an arbitrary point on the strange attractor and the actual trajectory, the lifetime t of the most stable unstable periodic orbit in the vicinity of this point starts to diverge with a power law. The volume in parameter space where t becomes infinite is finite and from its nonfractal boundaries one ca...

For investigation and developing fundamental knowledge about how and why ships and structures behave in an ocean environment Norway started the Centre for Ships and Ocean Structures. One of the research topics of this centre of excellence is parametric roll resonance. Parametric roll resonance is a phenomenon that causes a roll motion to a ship due to longitudinal waves. This roll motion can be...

This paper presents a further development of the mechanism for the detection of weak magnetic fields proposed by [Lednev (1991): Bioelectromagnetics 12:71-75]. The fraction of excited oscillator states of an unhydrated ion is studied in a dynamic model driven by the predicted (time-varying) transition probability in the presence of thermal noise and an unspecified excitation mechanism. The main...

A parametric model of the vocaf tract is developed based on an inventory of area functions ~quired for one male subject with Magnetic Resonance Imaging (MRI). The model is then used to synthesize a sentence recorded from the same sub ject. AREA FUNCTION MODEL OF THE VOCAL TRACT The question that is addressed in this paper is whether an inventory of vocal tract area functions, which represent on...

A new theory of thermal history after inflation is outlined by taking into account the effect of parametric resonance caused by inflaton oscillation. A typical outcome is existence of a high temperature phase, that makes possible GUT baryogenesis consistently with low enough gravitino abundance.

It has recently been suggested that the baryon washout problem of the standard electroweak baryogenesis scenario could be avoided if inflation ends with a period of parametric resonance at a low enough energy density. I present results of numerical simulations in which this process was studied in the Abelian Higgs model. Our results show that because of the masslessness of the gauge field, the ...