A Dyson sphere around a black hole
Sign Up to like & getrecommendations! Published in 2021 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stab1832
Abstract: The search for extraterrestrial intelligence (SETI) has been conducted for nearly 60 yr. A Dyson sphere, a spherical structure that surrounds a star and transports its radiative energy outwards as an energy source for an advanced… read more here.
Keywords: sphere around; energy; black hole; dyson sphere ... See more keywords
Retrolensing by light rays slightly inside and outside of a photon sphere around a Reissner-Nordström naked singularity
Sign Up to like & getrecommendations! Published in 2022 at "Physical Review D"
DOI: 10.1103/physrevd.105.024009
Abstract: We investigate retrolensing of sun lights reflected by a photon sphere around a Reissner-Nordström naked singularity. We apply the deflection angles of light rays reflected by slightly outside the photon sphere and rays reflected by… read more here.
Keywords: sphere around; around reissner; photon sphere; naked singularity ... See more keywords