Reissner–Nordström expansion

We propose a classical mechanism for the cosmic expansion during the radiation-dominated era. This mechanism assumes that the Universe is a two-component gas. The first component is a gas of ultra-relativistic “normal” particles described by an equation of state of an ideal quantum gas of massless particles. The second component consist of “unusual” charged particles (namely, either with ultra-high charge or with ultra-high mass) that provide the important mechanism of expansion due to their interaction with the “normal” component of the gas. This interaction is described by the Reissner–Nordström metric purely geometrically – the “unusual” particles are modeled as zero-dimensional naked singularities inside spheres of gravitational repulsion. The radius of a repulsive sphere is inversely proportional to the energy of an incoming particle or the temperature. The expansion mechanism is based on the inflating of the “unusual” particles (of charge Q) with the drop of the temperature – this drives apart all neutral particles and particles of specific charge q/m such that sign(Q)q/m ⩾ −1. The Reissner–Nordström expansion naturally ends at recombination. We discuss the range of model parameters within which the proposed expansion mechanism is consistent with the restrictions regarding quantum effects.