Stimulated radar collider for testing a model of dark energy

TL;DR

This paper proposes a novel stimulated radar collider to test a dark energy model involving a light dilaton, extending photon-photon scattering theory and aiming to reach gravitationally weak couplings with existing technology.

Contribution

It introduces a stimulated pulsed-radar collider concept for dark energy testing and extends scattering formulae to asymmetric collisions in this context.

Findings

Potential to reach gravitationally weak coupling domains

Requires technological advances in pulse compression and single-photon detection

Could expand the experimental horizon of particle physics

Abstract

We propose a stimulated pulsed-radar collider for testing a dilaton model with the mass of $\sim 10^{-7}$ eV as a candidate of dark energy. We have extended formulae for stimulated resonant photon-photon scattering in a quasi-parallel collision system by including fully asymmetric collision cases. With a pulse energy of 100 J in the GHz-band, for instance, which is already achieved by an existing klystron, we expect that the sensitivity can reach gravitationally weak coupling domains, if two key technological issues are resolved: pulse compression in time reaching the Fourier transform limit, and single-photon counting for GHz-band photons. Such testing might extend the present horizon of particle physics.