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2022

Effect of clustering on primordial black hole microlensing constraints

Gorton, Matthew, Green, Anne M.

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Stellar microlensing observations tightly constrain compact object dark matter in the mass range $(10^{-11} - 10^{3}) M_{\odot}$.

Primordial Black Holes (PBHs) form clusters, and it has been argued that these microlensing constraints are consequently weakened or evaded.
For the most commonly studied PBH formation mechanism, the collapse of large gaussian curvature perturbations generated by inflation, the clusters are sufficiently extended that the PBHs within them act as individual lenses.
We find that if the typical mass of the clusters is sufficiently large, $ \gtrsim 10^{6} M_{\odot}$, then the event duration distribution can deviate significantly from that produced by a smooth dark matter distribution, in particular at the shortest durations.

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2022

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