Characteristics of a Compensatory Manual Control System with Electrocutaneous Feedback, (9999)
Tanie,Kazuo, Tachi,Susumu, Komoriya,Kiyoshi, Iguchi,Hideo, Takabe,Masao
Electrocutaneous stimulation using electric pulse trains is one of the most effective cutaneous displays for tactual communication systems. This paper deals with the human operator's characteristics...
Boosted Black Holes on Kaluza-Klein Bubbles (2007)
Iguchi, Hideo, Mishima, Takashi, Tomizawa, Shinya
We construct an exact stationary solution of black hole -- bubble sequence in the five dimensional Kaluza-Klein theory by using solitonic solution generating techniques. The solution describes two...
Rotating Black Holes on Kaluza-Klein Bubbles (2007)
Tomizawa, Shinya, Iguchi, Hideo, Mishima, Takashi
Using the solitonic solution generating techniques, we generate a new exact solution which describes a pair of rotating black holes on a Kaluza-Klein bubble as a vacuum solution in the...
Black diring and infinite nonuniqueness (2007)
Iguchi, Hideo, Mishima, Takashi
We show that the $S^1$-rotating black rings can be superposed by the solution generating technique. We analyze the black diring solution for the simplest case of multiple rings. There exists an...
Relationship Between Solitonic Solutions of Five-Dimensional Einstein Equations (2006)
Tomizawa, Shinya, Iguchi, Hideo, Mishima, Takashi
We give the relation between the solutions generated by the inverse scattering method and the B\"acklund transformation applied to the vacuum five-dimensional Einstein equations. In particular, we...
Solitonic generation of vacuum solutions in five-dimensional General Relativity (2006)
Iguchi, Hideo, Mishima, Takashi
We describe a solitonic solution-generating technique for the five-dimensional General Relativity. Reducing the five-dimensional problem to the four-dimensional one, we can systematically obtain...
Solitonic generation of five-dimensional black ring solution (2006)
Iguchi, Hideo, Mishima, Takashi
Using the solitonic solution-generating technique we rederived the one-rotational five-dimensional black ring solution found by Emparan and Reall. The seed solution is not the Minkowski metric, which...
Mishima, Takashi, Iguchi, Hideo
New axisymmetric stationary solutions of the vacuum Einstein equations in five-dimensional asymptotically flat spacetimes are obtained by using solitonic solution-generating techniques. The new...
Spherically symmetric perfect fluid in area-radial coordinates (2004)
Iguchi, Hideo, Harada, Tomohiro, Mena, Filipe C
We study the spherically symmetric collapse of a perfect fluid using area-radial coordinates. We show that analytic mass functions describe a static regular centre in these coordinates. In this case,...
Harada, Tomohiro, Iguchi, Hideo, Shibata, Masaru
Nonspherical stellar collapse to a black hole is one of the most promising gravitational wave sources for gravitational wave detectors. We numerically study gravitational waves from a slightly...
A Classification of Spherically Symmetric Kinematic Self-Similar Perfect-Fluid Solutions. II (2003)
Maeda, Hideki, Harada, Tomohiro, Iguchi, Hideo, Okuyama, Naoya
We give a classification of spherically symmetric kinematic self-similar solutions. This classification is complementary to that given in a previous work by the present authors [Prog. Theor. Phys....
A Classification of Spherically Symmetric Kinematic Self-Similar Perfect-Fluid Solutions (2002)
Maeda, Hideki, Harada, Tomohiro, Iguchi, Hideo, Okuyama, Naoya
We classify all spherically symmetric spacetimes admitting a kinematic self-similar vector of the second, zeroth or infinite kind. We assume that the perfect fluid obeys either a polytropic equation...
No Go Theorem for Kinematic Self-Similarity with A Polytropic Equation of State (2002)
Maeda, Hideki, Harada, Tomohiro, Iguchi, Hideo, Okuyama, Naoya
We have investigated spherically symmetric spacetimes which contain a perfect fluid obeying the polytropic equation of state and admit a kinematic self-similar vector of the second kind which is...
Physical Processes in Naked Singularity Formation (2002)
Harada, Tomohiro, Iguchi, Hideo, Nakao, Ken-ichi
Gravitational collapse is one of the most fruitful subjects in gravitational physics. It is well known that singularity formation is inevitable in complete gravitational collapse. It was conjectured...
Is dark energy the only solution to the apparent acceleration of the present universe? (2001)
Iguchi, Hideo, Nakamura, Takashi, Nakao, Ken-ichi
Even for the observed luminosity distance D_L(z), which suggests the existence of dark energy, we show that an inhomogeneous dust universe solution without dark energy is possible in general. Future...
Physical aspects of naked singularity explosion - How does a naked singularity explode? -- (2001)
Iguchi, Hideo, Harada, Tomohiro
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 radiation was predicted....
Naked singularities and quantum gravity (2000)
Harada, Tomohiro, Iguchi, Hideo, Nakao, Ken-ichi, Singh, T. P., Tanaka, Takahiro, Vaz, Cenalo
There are known models of spherical gravitational collapse in which the collapse ends in a naked shell-focusing singularity for some initial data. If a massless scalar field is quantized on the...
Power, energy, and spectrum of a naked singularity explosion (2000)
Harada, Tomohiro, Iguchi, Hideo, Nakao, Ken-ichi
Naked singularity occurs in the gravitational collapse of an inhomogeneous dust ball from an initial density profile which is physically reasonable. We show that explosive radiation is emitted during...
Naked Singularity Explosion (2000)
Harada, Tomohiro, Iguchi, Hideo, Nakao, Ken-ichi
It is known that the gravitational collapse of a dust ball results in naked singularity formation from an initial density profile which is physically reasonable. In this paper, we show that explosive...
Gravitational Radiation from a Naked Singularity. II - Even-Parity Perturbation - (1999)
Iguchi, Hideo, Harada, Tomohiro, Nakao, Ken-ichi
A naked singularity occurs in the generic collapse of an inhomogeneous dust ball. We study the even-parity mode of gravitational waves from a naked singularity of the Lema\^{\i}tre-Tolman-Bondi...
Harada, Tomohiro, Nakao, Ken-ichi, Iguchi, Hideo
It was recently shown that the metric functions which describe a spherically symmetric space-time with vanishing radial pressure can be explicitly integrated. We investigate the nakedness and...
Gravitational Radiation from a Naked Singularity -- Odd-Parity Perturbation -- (1999)
Iguchi, Hideo, Harada, Tomohiro, Nakao, Ken-ichi
It has been suggested that a naked singularity may be a good candidate for a strong gravitational wave burster. The naked singularity occurs in the generic collapse of an inhomogeneous dust ball. We...
Naked singularity formation in the collapse of a spherical cloud of counterrotating particles (1998)
Harada, Tomohiro, Iguchi, Hideo, Nakao, Ken-ichi
We investigate collapse of a spherical cloud of counter-rotating particles. An explicit solution is given using an elliptic integral. If the specific angular momentum $L(r)=O(r^2)$ at $r\to 0$, no...
Iguchi, Hideo, Nakao, Ken-ichi, Harada, Tomohiro
The motion of a spherical dust cloud is described by the Lemaitre-Tolman-Bondi solution and is completely specified by initial values of distributions of the rest mass density and specific energy of...