Possible existence of viable models of bi-gravity with detectable graviton oscillations by gravitational wave detectors

TL;DR

This paper explores the potential for detecting graviton oscillations predicted by ghost-free bi-gravity theories through gravitational wave observations, highlighting feasible parameter ranges not ruled out by solar system tests.

Contribution

It demonstrates that bi-gravity models can produce observable graviton oscillations with parameters compatible with existing constraints, suggesting new targets for gravitational wave detectors.

Findings

Viable bi-gravity models can produce detectable graviton oscillations.

Parameter ranges for graviton mass are consistent with solar system constraints.

Gravitational wave detectors could observe inverse chirp signals from graviton oscillations.

Abstract

We discuss graviton oscillations based on the ghost free bi-gravity theory. We point out that this theory possesses a natural cosmological background solution which is very close to the case of general relativity. Furthermore, interesting parameter range of the graviton mass, which can be explored by the observations of gravitational waves, is not at all excluded by the constraint from the solar system tests. Therefore the graviton oscillation with possible inverse chirp signal would be an interesting scientific target of KAGRA, adv LIGO, adv Virgo and GEO.