Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The University of TokyoJP4.5k papers
- Yukawa Institute for Theoretical PhysicsJP2.7k papers
- The University of OsakaJP2.3k papers
- Nagoya UniversityJP2.2k papers
- High Energy Accelerator Research OrganizationJP2.2k papers
- Centre National de la Recherche ScientifiqueFR2.1k papers
- Tokyo Institute of TechnologyJP2k papers
- University of TsukubaJP1.7k papers
- Brookhaven National LaboratoryUS1.6k papers
- Stony Brook UniversityUS1.5k papers
- Waseda UniversityJP1.5k papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR1.5k papers
23 papers · 2 filters
The First Search for Gravitational Waves from Inspiraling Compact Binaries using TAMA300 data
Hideyuki Tagoshi, Nobuyuki Kanda, Takahiro Tanaka +2
We analyzed 6 hours of data from the TAMA300 detector by matched filtering, searching for gravitational waves from inspiraling compact binaries. We incorporated a two-step hierarch…
The Isotropy of Compact Universes
John D. Barrow, Hideo Kodama
We discuss the problem of the stability of the isotropy of the universe in the space of ever-expanding spatially homogeneous universes with a compact spatial topology. The anisotro…
Convex Functions and Spacetime Geometry
Gary W. Gibbons, Akihiro Ishibashi
Convexity and convex functions play an important role in theoretical physics. To initiate a study of the possible uses of convex functions in General Relativity, we discuss the con…
Analytic derivation of the map of null rays passing near a naked singularity
Takahiro Tanaka, T. P. Singh
Recently the energy emission from a naked singularity forming in spherical dust collapse has been investigated. This radiation is due to the particle creation in a curved spacetime…
Gravitational field and equations of motion of spinning compact binaries to 2.5 post-Newtonian order
Hideyuki Tagoshi, Akira Ohashi, Benjamin J. Owen
We derive spin-orbit coupling effects on the gravitational field and equations of motion of compact binaries in the 2.5 post-Newtonian approximation to general relativity, one PN o…
Naked singularities and quantum gravity
Tomohiro Harada, Hideo Iguchi, Ken-ichi Nakao +3
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 qua…
Instability of a membrane intersecting a black hole
Susumu Higaki, Akihiro Ishibashi, Daisuke Ida
The stability of a Nambu-Goto membrane at the equatorial plane of the Reissner-Nordstrøm-de Sitter spacetime is studied. The covariant perturbation formalism is applied to study th…
An asymptotic analysis of spherically symmetric perfect fluid self-similar solutions
B. J. Carr, A. A. Coley
The asymptotic properties of self-similar spherically symmetric perfect fluid solutions with equation of state p=alpha mu (-1<alpha<1) are described. We prove that for large and sm…
Birth of timelike naked singularity
H. Kudoh, T. Harada, H. Iguchi
We investigate the causal structure of the Harada-Iguchi-Nakao (HIN)'s exact solution in detail, which describes the dynamical formation of naked singularity in the collapse of a r…
Response of Interferometric Detectors to Scalar Gravitational Waves
Ken-ichi Nakao, Tomohiro Harada, Masaru Shibata +2
We rigorously analyze the frequency response functions and antenna sensitivity patterns of three types of interferometric detectors to scalar mode of gravitational waves which is p…
Black holes and a scalar field in an expanding universe
Hiromi Saida, Jiro Soda
We consider a model of an inhomogeneous universe including a massless scalar field, where the inhomogeneity is assumed to consist of many black holes. This model can be constructed…
Excitation of Kaluza-Klein modes of U(1) field by parametric resonance
Yoshiyuki Morisawa, Kunihito Uzawa, Shinji Mukohyama
In this paper, based on the theory of parametric resonance, we propose a cosmological criterion on ways of compactification: we rule out such a model of compactification that there…
Thick Domain Walls Intersecting a Black Hole
Yoshiyuki Morisawa, Ryo Yamazaki, Daisuke Ida +2
We discuss the gravitationally interacting system of a thick domain wall and a black hole. We numerically solve the scalar field equation in the Schwarzschild spacetime and show th…
No Black Hole Theorem in Three-Dimensional Gravity
Daisuke Ida
A common property of known black hole solutions in (2+1)-dimensional gravity is that they require a negative cosmological constant. In this letter, it is shown that a (2+1)-dimensi…
Spectral Evolution of the Universe
Masafumi Seriu
We derive the evolution equations for the spectra of the Universe. Here "spectra" means the eigenvalues of the Laplacian defined on a space, which contain the geometrical informati…
Naked Singularity Explosion
Tomohiro Harada, Hideo Iguchi, Ken-ichi Nakao
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…
A classification of spherically symmetric self-similar dust models
B. J. Carr
We classify all spherically symmetric dust solutions of Einstein's equations which are self-similar in the sense that all dimensionless variables depend only upon . We…
Locally U(1)*U(1) Symmetric Cosmological Models: Topology and Dynamics
Masayuki Tanimoto
We show examples which reveal influences of spatial topologies to dynamics, using a class of spatially {\it closed} inhomogeneous cosmological models. The models, called the {\it l…
The use of new coordinates for the template space in hierarchical search for gravitational waves from inspiraling binaries
Takahiro Tanaka, Hideyuki Tagoshi
We discuss a method to analyze data from interferometric gravitational wave detectors focusing on the technique of hierarchical search to detect gravitational waves from inspiralin…
Spectral Representation and the Averaging Problem in Cosmology
Masafumi Seriu
We investigate the averaging problem in cosmology as the problem of introducing a distance between spaces. We first introduce the spectral distance, which is a measure of closeness…
On cosmological perturbations in FRW model with scalar field and false vacuum decay
Arsen Khvedelidze, George Lavrelashvili, Takahiro Tanaka
The unconstrained reduced action corresponding to the dynamics of scalar fluctuations about the Friedmann-Robertson-Walker (FRW) background is derived using Dirac's method of descr…
Birth of the Brane World
Kazuya Koyama, Jiro Soda
Birth of the brane world is studied using the Hamiltonian approach. It is shown that an inflating brane world can be created from nothing. The wave function of the universe obtaine…
Dynamics of a string coupled to gravitational waves - Gravitational wave scattering by a Nambu-Goto straight string
Kouji Nakamura, Akihiro Ishibashi, Hideki Ishihara
We study the perturbative dynamics of an infinite gravitating Nambu-Goto string within the general-relativistic perturbation framework. We develop the gauge invariant metric pertur…