Tanaka Takahiro TANAKA Takahiro

Articles:  1-20 of 23

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  • Adiabatic Evolution of Three 'Constants' of Motion for Greatly Inclined Orbits in Kerr Spacetime

    GANZ Katsuhiko , HIKIDA Wataru , NAKANO Hiroyuki , SAGO Norichika , TANAKA Takahiro , Department of Physics Graduate School of Science Kyoto University , Department of Earth and Space Science Graduate School of Science Osaka University , Department of Physics and Astronomy and Center for Gravitational Wave Astronomy The University of Texas at Brownsville , School of Mathematics University of Southampton , Department of Physics Graduate School of Science Kyoto University

    General orbits of a particle of small mass μ around a Kerr black hole of mass M are characterized by three parameters: the energy, the angular momentum and the Carter constant. The time-averaged rates …

    Progress of Theoretical Physics 117(6), 1041-1066, 2007-06-25

    DOI  References (45)

  • Adiabatic Evolution of Orbital Parameters in Kerr Spacetime

    SAGO Norichika , TANAKA Takahiro , HIKIDA Wataru , GANZ Katsuhiko , NAKANO Hiroyuki , Department of Earth and Space Science Graduate School of Science Osaka University , Department of Physics Graduate School of Science Kyoto University , Yukawa Institute for Theoretical Physics Kyoto University , Department of Physics Graduate School of Science Kyoto University , Department of Mathematics and Physics Graduate School of Science Osaka City University

    We investigate the adiabatic orbital evolution of a point particle in Kerr spacetime due to the emission of gravitational waves. In the case that the timescale of the orbital evolution is sufficiently …

    Progress of Theoretical Physics 115(5), 873-907, 2006-05-25

    DOI  References (30)

  • Adiabatic Radiation Reaction to Orbits in Kerr Spacetime

    SAGO N. , Takahiro TANAKA , Wataru HIKIDA , Hiroyuki NAKANO , Department of Earth and Space Science Graduate School of Science Osaka University , Department of Physics Graduate School of Science Kyoto University , Yukawa Institute for Theoretical Physics Kyoto University , Department of Mathematics and Physics Graduate School of Science Osaka City University

    The geodesic motion of a point particle in Kerr geometry has three constants of motion, the energy E, the azimuthal angular momentum L, and the Carter constant Q. Under the adiabatic approximation, th …

    Progress of Theoretical Physics 114(2), 509-514, 2005-08

    DOI  Cited by (4)

  • A New Analytical Method for Self-Force Regularization. II : Testing the Efficiency for Circular Orbits

    HIKIDA Wataru , JHINGAN Sanjay , NAKANO Hiroyuki , SAGO Norichika , SASAKI Misao , TANAKA Takahiro , Yukawa Institute for Theoretical Physics Kyoto University:Department of Physics Graduate School of Science Kyoto University , Departamento de Fisica Teorica Universidad del Pais Vasco , Department of Mathematics and Physics Graduate School of Science Osaka City University , Department of Earth and Space Science Graduate School of Science Osaka University , Yukawa Institute for Theoretical Physics Kyoto University , Department of Physics Graduate School of Science Kyoto University

    In a previous paper, based on the black hole perturbation approach, we formulated a new analytical method for regularizing the self-force acting on a particle of small mass μ orbiting a Schwarzschild …

    Progress of Theoretical Physics 113(2), 283-303, 2005-02-25

    DOI  References (40)

  • A New Analytical Method for Self-Force Regularization. I : Charged Scalar Particles in Schwarzschild Spacetime

    HIKIDA Wataru , JHINGAN Sanjay , NAKANO Hiroyuki , SAGO Norichika , SASAKI Misao , TANAKA Takahiro , Yukawa Institute for Theoretical Physics Kyoto University , Departamento de Fisica Teorica Universidad del Pais Vasco , Department of Mathematics and Physics Graduate School of Science Osaka City University , Department of Physics Graduate School of Science Kyoto University:Department of Earth and Space Science Graduate School of Science Osaka University , Yukawa Institute for Theoretical Physics Kyoto University , Department of Physics Graduate School of Science Kyoto University

    We formulate a new analytical method for regularizing the self-force acting on a particle of small mass μ orbiting a black hole of mass M, where μ ≪ M. At first order in μ, the geometry is perturbed a …

    Progress of Theoretical Physics 111(6), 821-840, 2004-06-25

    DOI  References (38)

  • Classical Black Hole Evaporation in Randall-Sundrum Infinite Braneworld

    TANAKA Takahiro

    After the gravity induced on the brane in the Randall-Sundrum (RS) infinite braneworld is briefly reviewed, we discuss the possibility that black holes evaporate as a result of classical evolution in …

    Progress of Theoretical Physics (148), 307-316, 2003-03-28

    DOI  NDL Digital Collections  References (23) Cited by (5)

  • Gravitation in the Codimension Two Brane World

    HAYAKAWA Shoko , IDA Daisuke , SHIROMIZU Tetsuya , TANAKA Takahiro

    We derive the gravitational field equations on the three-brane in six dimensions. In a covariant manner, we show how Einstein gravity is recovered in the low energy limit. The Einstein equations are m …

    Progress of Theoretical Physics (148), 128-135, 2003-03-28

    DOI  NDL Digital Collections  References (32)

  • Brane Collisions and Braneworld Cosmology (Brane World: New Perspective in Cosmology)

    Gen Uchida , Ishibashi Akihiro , Tanaka Takahiro

    Progress of Theoretical Physics [109](-), 267-275, 2002

    DOI 

  • Anti-Parallel Spin Pairing in Color Superconductivity

    IWASAKI Masaharu , ISHIKAWA Satoshi , TANAKA Take-aki , Physics Department Kochi University , Physics Department Kochi University , Physics Department Kochi University

    We investigate helicity states of Cooper pairs in quark matter on the basis of a QCD-like theory. The Cooper pair consists of spin-triplet states with one-flavor quark matter if an s-wave and a color- …

    Progress of Theoretical Physics 104(5), 1041-1051, 2000-11-25

    DOI  References (20)

  • Thermodynamic Properties of Color Superconducting Quark Matter

    IWASAKI Masaharu , TANAKA Take-aki , ISHIKAWA Satoshi , Physics Department Kochi University , Physics Department Kochi University , Physics Department Kochi University

    Thermodynamics for color superconducting quark matter is investigated on the basis of the one-gluon-exchange model. Thermodynamic quantities are calculated by using a mean field (BCS) approximation. I …

    Progress of Theoretical Physics 104(4), 777-783, 2000-10-25

    DOI  References (13)

  • Asymptotic Behavior of Perturbations in Randall-Sundrum Brane-World

    TANAKA Takahiro , Yukawa Institute for Theoretical Physics Kyoto University

    The asymptotic behavior of metric perturbations in the Randall-Sundrum infinite brane world is carefully investigated, Perturbations generated by matter fields on the brane are shown to be regular eve …

    Progress of Theoretical Physics 104(3), 545-554, 2000-09-25

    DOI  References (29)

  • Super-Horizon Scale Dynamics of Multi-Scalar Inflation

    SASAKI Misao , TANAKA Takahiro , Department of Earth and Space Science Graduate School of Science Osaka University , Department of Earth and Space Science Graduate School of Science Osaka University

    We consider the dynamics of a multi-component scalar field on super-horizon scales in the context of inflationary cosmology. We present a method to solve the perturbation equations on super-horizon sc …

    Progress of Theoretical Physics 99(5), 763-781, 1998-05-25

    J-STAGE  References (23)

  • Gravitational Radiation Reaction

    MINO Yasushi , SASAKI Misao , TANAKA Takahiro

    In this chapter, we consider the radiation reaction to the motion of a point-like particle of mass m and specific spin S traveling on a curved background. Assuming S=O(Gm) and Gm ≪ L where L is the le …

    Progress of theoretical physics 128, 373-406, 1997-12-26

    DOI  NDL Digital Collections  References (15) Cited by (4)

  • Black Hole Perturbation

    MINO Yasushi , SASAKI Misao , SHIBATA Masaru , TAGOSHI Hideyuki , TANAKA Takahiro

    In this chapter, we present analytic calculations of gravitational waves from a particle orbiting a black hole. We first review the Teukolsky formalism for dealing with the gravitational perturbation …

    Progress of theoretical physics 128, 1-121, 1997-12-26

    DOI  NDL Digital Collections  References (62)

  • The Spectrum of Gravitational Wave Perturbations in the One-Bubble Open Inflationary Universe

    TANAKA Takahiro , SASAKI Misao , Department of Earth and Space Science Osaka University , Department of Earth and Space Science Osaka University

    We give the initial spectrum of quantized gravitational waves in the context of the one-bubble open inflationary universe scenario. In determining the quantum state after the bubble nucleation, we ado …

    Progress of Theoretical Physics 97(2), 243-262, 1997-02-25

    J-STAGE  References (24)

  • Gravitational Waves by a Particle in Circular Orbits around a Schwarzschild Black Hole : 5.5 Post-Newtonian Formula

    TANAKA Takahiro , TAGOSHI Hideyuki , SASAKI Misao , Department of Earth and Space Science Osaka University , National Astronomical Observator , Department of Earth and Space Science Osaka University

    Using the post-Newtonian (PN) expansion technique of the gravitational wave perturbation around a Schwarzschild black hole, we calculate analytically the energy flux of gravitational waves induced by …

    Progress of Theoretical Physics 96(6), 1087-1101, 1996-12-25

    J-STAGE  References (15)

  • Decoherence on Quantum Tunneling in the Multi-Dimensional Wave Function Approach

    TANAKA Takahiro , Department of Physics Kyoto University

    We consider fundamental problems on the understanding of the tunneling phenomena in the context of the multi-dimensional wave function. In this paper, we reconsider the quantum state after tunneling a …

    Progress of Theoretical Physics 93(1), 67-85, 1995-01-25

    DOI  References (19)

  • Probability Distribution of Primordial Angular Momentum and Formation of Massive Black Holes

    Hajime SUSA , Misao SASAKI , Takahiro TANAKA , Department of Physics Kyoto University , Department of Physics Kyoto University , Department of Physics Kyoto University

    We consider the joint probability distribution function for the mass contrast and angular momentum of over-density regions on the protogalactic scale and investigate the formation of massive black hol …

    Progress of Theoretical Physics 92(5), p961-974, 1994-11

    DOI 

  • Disorder Entropy at the Phase Transition of AgI and Ag2S (Foundations and Applications of Cluster Variation Method and Path Probability Method) -- (Applications of Cluster Variation Method)

    TANAKA Tomoyasu , MIYAZIMA Sasuke , KAKIUCHI Takahiro , OOTA Yasuhito

    AgI and Ag_2S are well studied superionic conductors which undergo a first order phase transition. By comparing the theoretical and experimental values of the discontinuous entropy change at the trans …

    Progress of theoretical physics (Suppl 115), p185-194, 1994-05

    DOI  NDL Digital Collections 

  • Structure of the Density Matrices in the Cluster Variation Method--Choices between Local Fields and Correlation Functions (Foundations and Applications of Cluster Variation Method and Path Probability Method) -- (Foundations of Cluster Variation Method)

    TANAKA Tomoyasu , HIROSE Kouzi , KURATI Kenpou

    Two of the formulations of the cluster variation method are compared. The Heisenberg model of ferromagnetism in four-spin approximation is used as a working example. The numerical results obtained are …

    Progress of theoretical physics (Suppl 115), p41-58, 1994-05

    DOI  NDL Digital Collections  Cited by (1)

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