f(R) Gravity, relic coherent gravitons and optical chaos

TL;DR

This paper explores how relic massive gravitons from f(R) gravity could influence the universe's structure and cosmic microwave background through gravitational lensing and optical chaos, linking string theory, early universe physics, and observable cosmological effects.

Contribution

It introduces a novel mechanism where relic gravitons from f(R) gravity cause lensing effects that produce optical chaos and structural features in the universe.

Findings

Relic gravitons can focus radiation, creating filamentary structures.

Gravitational lensing by relic GWs affects CMB photon trajectories.

Optical chaos may amplify observable effects in the universe.

Abstract

We discuss the production of massive relic coherent gravitons in a particular class of f(R) gravity which arises from string theory and their possible imprint in Cosmic Microwave Background. In fact, in the very early universe these relic gravitons could have acted as slow gravity waves. They may have then acted to focus the geodesics of radiation and matter. Therefore, their imprint on the later evolution of the universe could appear as filaments and domain wall in the Universe today. In that case, the effect on Cosmic Microwave Background should be analogous to the effect of water waves, which, in focusing light, create optical caustics which are commonly seen on the bottom of swimming pools. We analyze this important issue by showing how relic massive GWs perturb the trajectories of Cosmic Microwave Background photons (gravitational lensing by relic GWs). The consequence of the type of physics discussed is outlined by illustrating an amplification of what might be called optical chaos.