63 citations · 493 across the 42 of their papers we have counts for
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Red and blue shift in spherical and axisymmetric spacetimes and astrophysical constraints
Roberto Giambò, Orlando Luongo, Lorenza Mauro
We compute the red and blue shifts for astrophysical and cosmological sources. In particular, we consider low, intermediate and high gravitational energy domains. Thereby, we handl…
Alleviating the cosmological constant problem from particle production
Alessio Belfiglio, Roberto Giambò, Orlando Luongo
We explore a toy model mechanism of geometric cancellation, alleviating the (classical) cosmological constant problem. To do so, we assume at primordial times that vacuum energy fu…
Constraining primordial black holes as a fraction of dark matter through accretion disk luminosity
Rocco D'Agostino, Roberto Giambò, Orlando Luongo
In this paper, we consider the hypothesis that fractions of dark matter could be constituted by primordial black holes (PBHs). To test this possibility, we work out the observation…