12 citations · 32 across the 3 of their papers we have counts for
3 papers
gr-qc2022★ 12 cited
Conformally Schwarzschild cosmological black holes
Takuma Sato, Hideki Maeda, Tomohiro Harada
We thoroughly investigate conformally Schwarzschild spacetimes in different coordinate systems to seek for physically reasonable models of a cosmological black hole. We assume that…
gr-qc2021★ 10 cited
Complete classification of Friedmann-Lemaître-Robertson-Walker solutions with linear equation of state: parallelly propagated curvature singularities for general geodesics
Tomohiro Harada, Takahisa Igata, Takuma Sato +1
We completely classify the Friedmann-Lemaître-Robertson-Walker solutions with spatial curvature for perfect fluids with linear equation of state , where and $…
gr-qc2021★ 10 cited
Thakurta metric does not describe a cosmological black hole
Tomohiro Harada, Hideki Maeda, Takuma Sato
Recently, the Thakurta metric has been adopted as a model of primordial black holes. We show that the spacetime described by this metric has neither black-hole event horizon nor bl…