Quantum gravitational signatures in next-generation gravitational wave detectors

TL;DR

This paper explores how quantum gravity effects, modeled via the Generalized Uncertainty Principle, could influence inflationary cosmology and be detectable with future gravitational wave observatories.

Contribution

It establishes a link between GUP and modified gravity theories, and evaluates their impact on primordial gravitational wave signals for upcoming detectors.

Findings

GUP parameter $oldsymbol{\gamma_0}$ constrained by PLANCK data

Predictions for quantum gravity effects on primordial gravitational wave spectrum

Assessment of detectability prospects with next-generation detectors

Abstract

A recent study established a correspondence between the Generalized Uncertainty Principle (GUP) and Modified theories of gravity, particularly Stelle gravity. We investigate the consequences of this correspondence for inflation and cosmological observables by evaluating the power spectrum of the scalar and tensor perturbations using two distinct methods. First, we employ PLANCK observations to determine the GUP parameter $\gamma_0$. Then, we use the value of $\gamma_0$ to investigate the implications of quantum gravity on the power spectrum of primordial gravitational waves and their possible detectability in the next-generation detectors, like Einstein Telescope and Cosmic explorer.