405 citations · 5.4k across the 143 of their papers we have counts for
7 papers · 1 filter
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…
Tolman-Bondi collapse in scalar-tensor theories as a probe of gravitational memory
T. Harada, C. Goymer, B. J. Carr
In cosmological models with a varying gravitational constant, it is not clear whether primordial black holes preserve the value of at their formation epoch. We investigate this…
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…
Reconstructing the equation of state for cold nuclear matter from the relationship of any two properties of neutron stars
Tomohiro Harada
A direct method is developed to reconstruct the equation of state for high-density nuclear matter from the relationship between any two properties of neutron stars, such as masses,…
Physical aspects of naked singularity explosion - How does a naked singularity explode? --
Hideo Iguchi, Tomohiro Harada
The behaviors of quantum stress tensor for the scalar field on the classical background of spherical dust collapse is studied. In the previous works diverging flux of quantum radia…