4 July 2019 Quantum gravity and gravitational-wave astronomy Gianluca Calcagni,a Sachiko Kuroyanagi,b;c Sylvain Marsat,d Mairi Sakellariadou,e Nicola Tamanini,f Gianmassimo Tasinatog aInstituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid, Spain bDepartment of Physics, Nagoya University, Chikusa, Nagoya 464-8602, Japan cInstituto de F´ısicaTe´oricaUAM-CSIC, Universidad Auton´omade Madrid, Cantoblanco, 28049 Madrid, Spain dAPC, AstroParticule et Cosmologie, Universit´eParis Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cit´e,10, rue Alice Domon et L´eonieDuquet 75205 PARIS Cedex 13, France eTheoretical Particle Physics and Cosmology Group, Physics Department, King's College London, University of London, Strand, London WC2R 2LS, United Kingdom f Max-Planck-Institut f¨urGravitationsphysik, Albert-Einstein-Institut, Am M¨uhlenberg 1, 14476 Potsdam-Golm, Germany gDepartment of Physics, Swansea University, Swansea, SA2 8PP, UK E-mail:
[email protected],
[email protected],
[email protected],
[email protected],
[email protected], g.tasinato2208gmail.com Abstract. We investigate possible signatures of quantum gravity which could be tested with current and future gravitational-wave (GW) observations. In particular, we analyze how quantum gravity can influence the GW luminosity distance, the time dependence of the effective Planck mass and the instrumental strain noise of interferometers. Using both model-dependent and model-independent formulæ, we show that these quantities can encode a non-perturbative effect typical of all quantum-gravity theories, namely the way the dimen- sion of spacetime changes with the probed scale. Effects associated with such dimensional arXiv:1907.02489v1 [gr-qc] 4 Jul 2019 flow might be tested with GW observations and constrained significantly in theories with a microscopically discrete spacetime geometry, more strongly than from propagation-speed constraints.