11 citations · 21 across the 2 of their papers we have counts for
2 papers
gr-qc2015★ 10 cited
Spherical polytropic balls cannot mimic black holes
Hiromi Saida, Atsuhito Fujisawa, Chul-Moon Yoo +1
The so-called black hole shadow is a dark region which is expected to appear in a fine image of optical observation of black holes. It is essentially an absorption cross section of…
gr-qc2015★ 11 cited
Maximum mass of a barotropic spherical star
Atsuhito Fujisawa, Hiromi Saida, Chul-Moon Yoo +1
The ratio of total mass to surface radius of spherical perfect fluid ball has an upper bound, . Buchdahl obtained under the assumptions; non-increasing m…