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13 papers · 2 filters
Have we already detected astrophysical symptoms of space-time noncommutativity ?
Takashi Tamaki, Tomohiro Harada, Umpei Miyamoto +1
We discuss astrophysical implications of -Minkowski space-time, in which there appears space-time noncommutativity. We first derive a velocity formula for particles based on the…
Conservation laws for collisions of branes (or shells) in general relativity
David Langlois, Kei-ichi Maeda, David Wands
We consider the collision of self-gravitating n-branes in a (n+2)-dimensional spacetime. We show that there is a geometrical constraint which can be expressed as a simple sum rule…
Adjusted ADM systems and their expected stability properties: constraint propagation analysis in Schwarzschild spacetime
Hisa-aki Shinkai, Gen Yoneda
In order to find a way to have a better formulation for numerical evolution of the Einstein equations, we study the propagation equations of the constraints based on the Arnowitt-D…
Stability criterion for self-similar solutions with perfect fluids in general relativity
Tomohiro Harada
A stability criterion is derived for self-similar solutions with perfect fluids which obey the equation of state in general relativity. A wide class of self-similar solution…
Critical phenomena in Newtonian gravity
Hideki Maeda, Tomohiro Harada
We investigate the stability of self-similar solutions for a gravitationally collapsing isothermal sphere in Newtonian gravity by means of a normal mode analysis. It is found that…
Density Discontinuity of a Neutron Star and Gravitational Waves
Hajime Sotani, Kazuhiro Tominaga, Kei-ichi Maeda
We calculate quasi-normal f- and g-modes of a neutron star with density discontinuity, which may appear in a phase transition at extreme high density. We find that discontinuity wi…