Next Generation Gravitational Wave Detectors Could Pin Down Dark Matter - by andytomaswick
Interferometers designed to detect gravitational ways could potentially pick up signals affected by particles that are heavy enough to fall into this category. In particular, those particles would affect three different characteristics of the gravitational wave, two of which the authors are calculating for the first time,
For a more nuanced look at dark matter may affect GWs, the authors look at the Shapiro and Einstein delay. The Shapiro delay is a change in how long it takes a signal to travel from one end of an interferometer to the other. This can be changed based on whether there is a compaction of space-time somewhere along the arm of the interferometer. On the other hand, the Einstein delay is an actual delay in the clock the interferometer uses to measure gravitational waves.
What the authors derive from all of this is that modern GW observatories that are expected to come online shortly, such as gravity from the Quantum Entanglement of Space-Time experiment at CalTech, should be able to detect transiting dark matter if it is large enough to be considered “ultra-heavy.
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