Four seasons of TAIGA-HiSCORE data show no nanosecond optical transients, setting an upper limit of about 1e-3 events per steradian per hour.
Compact extra dimensions as the source of primordial black holes
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abstract
We discuss the model of the primordial black holes formation at the reheating stage. These small massive black holes appear due to specific properties of the compact extra dimensions. The latter gives rise the low energy model containing the effective scalar field potential capable for the domain walls production. Formed during inflation, these walls are quite dense so they collapse soon after inflation ends. The discussion is performed within the scope of multidimensional $f(R)$-gravity.
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Four years of wide-field search for nanosecond optical transients with the TAIGA-HiSCORE Cherenkov array
Four seasons of TAIGA-HiSCORE data show no nanosecond optical transients, setting an upper limit of about 1e-3 events per steradian per hour.