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5 papers · 2 filters
Einstein-Rosen waves and the self-similarity hypothesis in cylindrical symmetry
Tomohiro Harada, Ken-ichi Nakao, Brien C. Nolan
The self-similarity hypothesis claims that in classical general relativity, spherically symmetric solutions may naturally evolve to a self-similar form in certain circumstances. In…
High-Speed Collapse of a Hollow Sphere of Type I Matter
Zahid Ahmad, Tomohiro Harada, Ken-ichi Nakao +1
In this paper, we study the dynamics of a hollow spherical matter collapsing with very large initial velocity. The spacetime is initially very similar to the Vaidya solution, and t…
Revisiting chameleon gravity - thin-shells and no-shells with appropriate boundary conditions
Takashi Tamaki, Shinji Tsujikawa
We derive analytic solutions of a chameleon scalar field that couples to a non-relativistic matter in the weak gravitational background of a spherically symmetric body, paying…
Lemaitre-Tolman-Bondi collapse from the perspective of loop quantum gravity
Martin Bojowald, Tomohiro Harada, Rakesh Tibrewala
Lemaitre-Tolman-Bondi models as specific spherically symmetric solutions of general relativity simplify in their reduced form some of the mathematical ingredients of black hole or…
Asymptotically Friedmann self-similar scalar field solutions with potential
Masanori Kyo, Tomohiro Harada, Hideki Maeda
We investigate self-similar solutions which are asymptotic to the Friedmann universe at spatial infinity and contain a scalar field with potential. The potential is required to be…