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7 papers · 2 filters
The Constancy of the Constants of Nature: Updates
Takeshi Chiba
The current observational and experimental bounds on the time variation of the constants of nature (the fine structure constant , the gravitational constant and the proton-e…
What are universal features of gravitating Q-balls?
Takashi Tamaki, Nobuyuki Sakai
We investigate how gravity affects Q-balls by exemplifying the case of the Affleck-Dine potential . Surprisingly, stable Q-balls with arbitrarily…
Shadows of Colliding Black Holes
Daisuke Nitta, Takeshi Chiba, Naoshi Sugiyama
We compute the shadows of colliding black holes using the Kastor-Traschen cosmological multiblack hole solution that is an exact solution describing the collision of maximally char…
Systematic solution-generation of five-dimensional black holes
Hideo Iguchi, Keisuke Izumi, Takashi Mishima
Solitonic solution-generating methods are powerful tools to construct nontrivial black hole solutions of the higher-dimensional Einstein equations systematically. In five dimension…
Gravitating Q-balls in the Affleck-Dine mechanism
Takashi Tamaki, Nobuyuki Sakai
We investigate how gravity affects "Q-balls" with the Affleck-Dine potential . Contrary to the flat case, in which equilibrium s…
How does gravity save or kill Q-balls?
Takashi Tamaki, Nobuyuki Sakai
We explore stability of gravitating Q-balls with potential via catastrophe theory, as an extension of our previous work on Q-balls with…