Spacetime foam induced collective bundling of intense fields

TL;DR

This paper explores how spacetime foam affects bosonic fields, revealing a novel collective anti-dissipation effect that causes particles to bundle together in momentum space, with implications for quantum gravity and field coherence.

Contribution

It introduces a new collective anti-dissipation mechanism caused by spacetime foam, leading to particle bundling in momentum space, and analyzes its effects on scalar bosons under quantum gravitational influences.

Findings

Decoherence and dissipation are suppressed for free bosons over long times.

A new collective anti-dissipation effect causes particles to bundle in momentum space.

The bundling width scales inversely with particle number or as its square root.

Abstract

The influence of spacetime foam on a broad class of bosonic fields with arbitrary numbers of particles in the low energy regime is investigated. Based on recently formulated general description of open quantum gravitational systems, we analyse the propagation of scalar, electromagnetic, and gravitational waves on both long and short time scales with respect to their mean frequencies. For the long time propagation, the Markov approximation is employed that neglects the effects of initial conditions of these waves. In this case, despite intuitively expected decoherence and dissipation from the noisy spacetime, we show that such phenomena turn out to be completely suppressed for scalar bosons, photons, and gravitons, which are coupled to gravity but otherwise free. The short time effects are then recovered through the transient non-Markovian evolution. Focusing on scalar bosons in initially incoherent states, we find that the resulting quantum dissipation depend strongly on the distribution of the particle momentum states. We further identify a hitherto undiscovered collective anti-dissipation mechanism for a large number of particles. The surprising new effect tends to "bundle" identical particles within a sharply distributed momentum states having a width inversely proportional to the particle number due to the thermal fluctuations, or its square root due to the vacuum fluctuations of spacetime.