199 citations · 631 across the 22 of their papers we have counts for
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astro-ph.HE2012★ 7 cited
Quasiperiodic oscillations and Tomimatsu-Sato δ = 2 space-time
Ivan Zh. Stefanov, Galin G. Gyulchev, Stoytcho S. Yazadjiev
We model the spacetime of low-mass X-ray binaries with the Tomimatsu-Sato δ = 2 (TS2) metric and study the properties of the orbital and the epicyclic frequencies. The numerical an…
gr-qc2012★ 68 cited
Gravitational Lensing by Phantom Black holes
Galin N. Gyulchev, Ivan Zh. Stefanov
In some models dark energy is described by phantom scalar fields (scalar fields with "wrong" sign of the kinetic term in the lagrangian). In the current paper we study the effect o…