Ultralight (or fuzzy) dark matter (ULDM) is an alternative to cold dark
matter. A key feature of ULDM is the presence of solitonic cores at the centers
of collapsed halos. These would potentially increase the drag experienced by
supermassive black hole (SMBH) binaries, changing their merger dynamics and the
resulting gravitational wave background. We perform detailed simulations of
high-mass SMBH binaries in the soliton of a massive halo. We find more rapid
decay than previous simulations and semi-analytic approximations. We confirm
expectations that the drag depends strongly on the ULDM particle mass, finding
masses greater than $10^{-21}$ eV could potentially alleviate the final parsec
problem and that ULDM may even suppress gravitational wave production at lower
frequencies in the pulsar timing band.

Este artículo explora los viajes en el tiempo y sus implicaciones.

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