Phenomenological footprints of Lambda varying gravity theories inspired from quantum gravity models in the multi-messenger era

TL;DR

This paper explores how theories with a variable cosmological constant, inspired by quantum gravity, produce observable effects in astrophysics, especially in supernova luminosity distances, within the multi-messenger astronomy era.

Contribution

It introduces a general framework for Lambda varying gravity theories inspired by quantum gravity models, applicable to various actions and astrophysical systems.

Findings

Non-negligible corrections to luminosity distances in astrophysical objects.

Distinctive signatures in lensing measurements.

Potential observable footprints in multi-messenger data.

Abstract

An interesting phenomenological consequence of Lambda varying gravity theories inspired by quantum gravity models is reported. The treatment in the present work is quite general and applicable to several different actions with Lambda varying, especially those used in RG approaches to quantum gravity. An effective gravitational action with a scale varying cosmological constant, Lambda, which depends on the system's characteristics, like the length and the energy density, is the key feature. If the system is an astrophysical object, like a cluster of galaxies, a black hole, etc, non-negligible corrections arise to several observable quantities. Distinctive footprints could refer to luminosity distance and strong/weak lensing measurements, among others. The present study focuses on the SNIa luminosity distance observable.