Spectral fringes in a few GRB observations indicate possible femtolensing by primordial black holes, providing upper limits on their fractional abundance as dark matter.
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Primordial Black Hole signatures from femtolensing and spectral fringe of Gamma Ray Bursts
Spectral fringes in a few GRB observations indicate possible femtolensing by primordial black holes, providing upper limits on their fractional abundance as dark matter.