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10 papers · 2 filters
Semiclassical Instability of the Cauchy Horizon in Self-Similar Collapse
Umpei Miyamoto, Tomohiro Harada
Generic spherically symmetric self-similar collapse results in strong naked-singularity formation. In this paper we are concerned with particle creation during a naked-singularity…
Stability criterion for self-similar solutions with a scalar field and those with a stiff fluid in general relativity
Tomohiro Harada, Hideki Maeda
A stability criterion is derived in general relativity for self-similar solutions with a scalar field and those with a stiff fluid, which is a perfect fluid with the equation of st…
Astrophysical Implications of Higher-Dimensional Gravity
Tomas Liko, James M. Overduin, Paul S. Wesson
We review the implications of modern higher-dimensional theories of gravity for astrophysics and cosmology. In particular, we discuss the latest developments of space-time-matter t…
Restricting quark matter models by gravitational wave observation
Hajime Sotani, Kazunori Kohri, Tomohiro Harada
We consider the possibilities for obtaining information about the equation of state for quark matter by using future direct observational data on gravitational waves. We study the…
Kinematical bound in asymptotically translationally invariant spacetimes
Tetsuya Shiromizu, Daisuke Ida, Shinya Tomizawa
We present positive energy theorems in asymptotically translationally invariant spacetimes which can be applicable to black strings and charged branes. We also address the bound pr…
Nonradial oscillations of quark stars
Hajime Sotani, Tomohiro Harada
Recently, it has been reported that a candidate for a quark star may have been observed. In this article, we pay attention to quark stars with radiation radii in the reported range…