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Probing gravity with spacetime sirens
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DOI：10.1086/522931.png)
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A gravitational observatory such as LISA will detect coalescing pairs of massive black holes, accurately measure their luminosity distance, and help identify a host galaxy or an electromagnetic counterpart. If dark energy is a manifestation of modified gravity on large scales, gravitational waves from cosmologically distant spacetime sirens are direct probes of this new physics. For example, a gravitational Hubble diagram based on black hole pair luminosity distances and host galaxy redshifts could reveal a large distance extradimensional leakage of gravity. Various additional signatures may be expected in a gravitational signal propagated over cosmological scales.
Keyword:
black hole physics
gravitation
gravitational waves
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5.4
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