A Higher Probability of Detecting Lensed Supermassive Black Hole Binaries by LISA

Abstract

Gravitational lensing of gravitational waves (GWs) is a powerful probe of the matter distribution in the universe. Here we revisit the wave-optics effects induced by dark matter (DM) halos on the GW signals of merging massive black hole binaries (MBHBs), and we study the possibility of discerning these effects using the Laser Interferometer Space Antenna (LISA). In particular, we include the halos in the low-mass range of $10^5-10^8{\mathrm{M}}_{\odot }$ since they are the most numerous according to the cold DM model. We simulate the lensed signals corresponding to a wide range of impact parameters, and we find distinguishable deviation from the standard best-fit GW templates even when the impact parameter is as large $y\simeq 50$. Consequently, we estimate that over $(0.1-1.6)\%$ of the MBHBs in the mass range of $10^{5.0}-10^{6.5}{\mathrm{M}}_{\odot }$ and the redshift range of $4-10$ should show detectable wave-optics effects. This probability is one order of magnitude higher than that derived in previous works. The uncertainty comes mainly from the mass function of the DM halos. Not detecting any signal during the LISA mission would imply that DM halos with $10^5-10^8{\mathrm{M}}_{\odot }$ are less numerous than what the cold DM model predicts.

arXiv comment10 pages, 14 figures, accepted for publication in MNRAS

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