No torque mechanism studied supplies enough angular momentum for the innermost light-PBH shells around a heavy seed, so the spike core is swallowed and far less dense than a WIMP spike.
AMPM I. A Targeted Search for Asteroid Mass Primordial Black Hole Microlenses
2 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
Gravitational microlensing is a powerful technique for constraining the abundance of dark matter in asteroid mass to supermassive primordial black holes at masses of $-11 \lesssim \log M/\mathrm{M}_\odot \lesssim 5$. In this work, we introduce a new high-cadence stellar microlensing survey in the Large Magellanic Cloud, AMPM. The primary goal of AMPM is to place constraints in the asteroid-to-planetary-mass regime of primordial black hole dark matter. We present the five nights of survey data, the microlensing detection pipeline, and the microlensing efficiency of AMPM. We explore the impact of the stellar distribution in the Large Magellanic Cloud on the microlensing detection efficiency and conduct a detailed analysis of second-order microlensing effects and the impact on the primordial black hole dark matter constraints. Our findings indicate that these second-order effects shift the maximum sensitivity of AMPM toward the lunar-mass black hole regime at $10^{-8} - 10^{-6} \, M_{\odot}$. From the five nights of data, we detect a single microlensing candidate and find that AMPM can constrain at the 95\% C.L up to 30\% of the Galactic primordial black hole dark matter distribution.
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2026 2verdicts
ACCEPT 2representative citing papers
Phoebe is an intrinsically variable star whose multiple brightenings, including the 2019 event claimed as a microlensing signal, rule out the lunar-mass primordial black hole interpretation.
citing papers explorer
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The swallowed spike: the formation of light primordial black hole structures around heavy seeds
No torque mechanism studied supplies enough angular momentum for the innermost light-PBH shells around a heavy seed, so the spike core is swallowed and far less dense than a WIMP spike.
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Eppur non si trovano Vol. 3: Phoebe -- a Mirage of a Primordial Black Hole
Phoebe is an intrinsically variable star whose multiple brightenings, including the 2019 event claimed as a microlensing signal, rule out the lunar-mass primordial black hole interpretation.