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Gravitational-wave luminosity distance in quantum gravity

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arxiv 1904.00384 v3 pith:4WTLNP23 submitted 2019-03-31 gr-qc astro-ph.COhep-th

Gravitational-wave luminosity distance in quantum gravity

Gianluca Calcagni , Sachiko Kuroyanagi , Sylvain Marsat , Mairi Sakellariadou , Nicola Tamanini , Gianmassimo Tasinato This is my paper
classification gr-qc astro-ph.COhep-th
keywords quantumgravityboundsdimensionaldistanceflowgravitational-wavelisa
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Dimensional flow, the scale dependence of the dimensionality of spacetime, is a feature shared by many theories of quantum gravity (QG). We present the first study of the consequences of QG dimensional flow for the luminosity distance scaling of gravitational waves in the frequency ranges of LIGO and LISA. We find generic modifications with respect to the standard general-relativistic scaling, largely independent of specific QG proposals. We constrain these effects using two examples of multimessenger standard sirens, the binary neutron-star merger GW170817 and a simulated supermassive black-hole merger event detectable with LISA. We apply these constraints to various QG candidates, finding that the quantum geometries of group field theory, spin foams and loop quantum gravity can give rise to observable signals in the gravitational-wave spin-2 sector. Our results complement and improve GW propagation-speed bounds on modified dispersion relations. Under more model-dependent assumptions, we also show that bounds on quantum geometry can be strengthened by solar-system tests.

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