This article will review quantum particle creation in expanding universes. The emphasis will
be on the basic physical principles and on selected applications to cosmological models …

We show that in large-field inflationary scenarios, superheavy (many orders of magnitude
larger than the weak scale) dark matter will be produced in cosmologically interesting …

There are many reasons to believe the present mass density of the universe is dominated by
a weakly interacting massive particle (wimp), a fossil relic of the early universe. Theoretical …

The production of electron-positron pairs from light is a famous prediction of quantum
electrodynamics. Yet it is often emphasized that the number of produced pairs has no …

Pair creation in a uniform classical electromagnetic field (Schwinger mechanism) is studied
focusing on the time evolution of the distribution of created particles. The time evolution of …

We calculate analytically and numerically the production of superheavy dark matter (scalar
field X) when it is coupled to the inflaton field φ within the context of a slow-roll m φ 2 φ 2/2 …

In this paper, we analyze the quantum vacuum in a radiation-dominated and CPT-invariant
universe by further imposing the quantum states to be ultraviolet regular ie, satisfying the …

Within a broad class of inflationary models we critically analyse the way initial quantum
fluctuations on a new-physics hypersurface (NPH) affect standard predictions for large-scale …

In this paper a quantum-mechanical phase-space picture is constructed for coarse-grained
free quantum fields in an inflationary universe. The appropriate stochastic quantum Liouville …

We discuss the problem of defining a preferred vacuum state at a given time for a quantized
scalar field in Friedmann, Lemaître, Robertson, Walker space-time. Among the infinitely …