101 citations · 297 across the 30 of their papers we have counts for
31 papers
Black hole shadow and Maximal Black room
Masaru Siino
To comprehend the shadow of a black hole in a general spacetime, we have investigated the concept of the maximal black room (MBR). The boundary of the MBR is a non-spacelike hypers…
Black hole shadow and Wandering null geodesics
Masaru Siino
The role of the wandering null geodesic is studied in a black hole spacetime. Based on the continuity of the solution of the geodesic equation, the wandering null geodesics commonl…
Causal concept for black hole shadows
Masaru Siino
Causal concept for the general black hole shadow is investigated, instead of the photon sphere. We define several `wandering null geodesics' as complete null geodesics accompanied…
Dynamical deformation of 2+1 dimensional double torus universe
Masaru Siino
In (2+1)-dimensional pure gravity with cosmological constant, the dynamics of double torus universe with pinching parameter is investigated. Each mode of affine stretching deformat…
Dynamical degrees of freedom for higher genus Riemann surface in (2+1)-dimensional general relativity
Masaru Siino
A homogeneous two-dimensional metric including the degrees of freedom of Teichmüller deformation is developed. The Teichmüller deformation is incorporated by affine stretching of c…
Perturbations of Cosmological and Black Hole Solutions in Massive gravity and Bi-gravity
Tsutomu Kobayashi, Masaru Siino, Masahide Yamaguchi +1
We investigate perturbations of a class of spherically symmetric solutions in massive gravity and bi-gravity. The background equations of motion for the particular class of solutio…