# Constraints on hidden gravitons from fifth-force experiments and stellar energy loss

## TL;DR

This paper investigates the phenomenology of hidden spin-2 particles called hidden gravitons, deriving constraints from fifth-force experiments and stellar energy loss to limit their mass and coupling strength.

## Contribution

It provides a comprehensive analysis of constraints on hidden gravitons from both laboratory and astrophysical observations, extending previous bounds to new regimes.

## Key findings

- Constraints on hidden graviton mass and coupling strength derived from fifth-force experiments.
- Stellar energy loss processes impose additional bounds on hidden graviton properties.
- Potential deviations from Newtonian gravity at various scales are analyzed.

## Abstract

We study different phenomenological signatures associated with new spin-2 particles. These new degrees of freedom, that we call hidden gravitons, arise in different high-energy theories such as extra-dimensional models or extensions of General Relativity. At low energies, hidden gravitons can be generally described by the Fierz-Pauli Lagrangian. Their phenomenology is parameterized by two dimensionful constants: their mass and their coupling strength. In this work, we analyze two different sets of constraints. On the one hand, we study potential deviations from the inverse-square law on solar-system and laboratory scales. To extend the constraints to scales where the laboratory probes are not competitive, we also study consequences on astrophysical objects. We analyze in detail the processes that may take place in stellar interiors and lead to emission of hidden gravitons, acting like an additional source of energy loss.