Publication List

• Takeshi Chiba, Hiroki Matsui, Keiju Murata, Singularity avoidance in black hole interiors by quantum gravity effects, to appear in Phys.Rev.D

• Takeshi Chiba and Tsuyoshi Houri, Eisenhart Lift for Scalar Fields in the FLRW Universe, Class. Quantum Grav., 42, 055003 (2025).

• Takeshi Chiba and Tsuyoshi Houri, Hidden Symmetries of Power-law Inflation, Class. Quantum Grav., 41, 19LT01 (2024).

• Takeshi Chiba and Shunichiro Kinoshita, Note on the Time Dilation of Charged Quantum Clocks, Phys. Rev. D108, 044036 (2023).

• Takeshi Chiba and Shunichiro Kinoshita, Quantum Clocks, Gravitational Time Dilation, and Quantum Interference, Phys. Rev. D106, 124035 (2022).

• Takeshi Chiba, Spontaneous Scalarization in Scalar-Tensor Theories with Conformal Symmetry as an Attractor, Prog.Theor.Exp.Phys., 2022, 013E01 (2022).

• Seiji Kawamura et al., Current status of space gravitational wave antenna DECIGO and B-DECIGO, Prog.Theor.Exp.Phys., 2021, 05A105 (2021).

• Takeshi Chiba, Fabio Chibana, Masahide Yamaguchi, Disformal Invariance of Cosmological Observables, JCAP, 06 (2020) 003.

• Takuya Inoue, Eiichiro Komatsu, Wako Aoki, Takeshi Chiba, Toru Misawa, Tomonori Usuda, The effect of our local motion on the Sandage-Loeb test of the cosmic expansion, Publ.Astron.Soc.Japan., 72, L1 (2020).

• Seiji Kawamura et al., Space Gravitational Wave Antenna DECIGO and B-DECIGO, International Journal of Modern Physics D28, 1845001 (2019).

• Sachiko Kuroyanagi, Takeshi Chiba, Tomo Takahashi, Probing the Universe through the Stochastic Gravitational Wave Background, JCAP, 11 (2018) 038.

• Takeshi Chiba, Reconstructing f(R) Gravity from the Spectral Index, Prog.Theor.Exp.Phys., 2018, 113E01 (2018).

• Takeshi Chiba, Shuichiro Yokoyama, Spin Distribution of Primordial Black Holes, Prog.Theor.Exp.Phys., 2017, 083E01 (2017).

• Shuichi Sato et al., The status of DECIGO, J.Phys.Conf.Ser. 840, 012010 (2017).

• Junpei Ooba, Kiyotomo Ichiki, Takeshi Chiba, Naoshi Sugiyama, Cosmological Constraints on Scalar-Tensor Gravity and the Variation of the Gravitational Constant, Prog.Theor.Exp.Phys., 2017, 043E03 (2017).

• Takeshi Chiba and Masashi Kimura, A Note on Geodecis in the Hayward Metric, Prog.Theor.Exp.Phys., 2017, 043E01 (2017).

• Junpei Ooba, Kiyotomo Ichiki, Takeshi Chiba, Naoshi Sugiyama, Planck Constraints on Scalar-Tensor Cosmology and the Variation of the Gravitational Constant, Phys. Rev. D93, 122002 (2016).

• Takeshi Chiba, Reconstructing the Inflaton Potential from the Spectral Index, Prog.Theor.Exp.Phys., 2015, 073E02 (2015).

• Takeshi Chiba, Kazunori Kohri, Consistency Relations for Large Field Inflation: Nonminimal coupling, Prog.Theor.Exp.Phys., 2015, 023E01 (2015).

• Ryo Shiose, Masashi Kimura, Takeshi Chiba, Motion of Charged Particles around a Weakly Magnetized Rotating Black Hole, Phys. Rev. D90, 124016 (2014).

• Takeshi Chiba, Kazunori Kohri, Consistency Relations for Large Field Inflation, Prog.Theor.Exp.Phys. 2014, 093E01 (2014).

• Sachiko Kuroyanagi, Shinji Tsujikawa, Takeshi Chiba, Naoshi Sugiyama, Implication of the B-mode Polarization Measurement for Direct Detection of Inflationary Gravitationary Waves, Phys. Rev. D90, 063513 (2014).

• Takeshi Chiba, Antonio De Felice, Shinji Tsujikawa, Cosmological Scaling Solutions for Multiple Scalar Fields, Phys. Rev. D90, 023516 (2014).

• Takeshi Chiba, Masahide Yamaguchi, Conformal-Frame (In)dependence of Cosmological Observations in Scalar-Tensor Theory, JCAP, 10 (2013) 040.

• Takeshi Chiba, Antonio De Felice, Shinji Tsujikawa, Observational Constraints on Quintessence: Thawing, Tracker, and Scaling Models, Phys. Rev. D87, 083505 (2013).

• Akifumi Yumoto, Daisuke Nitta, Takeshi Chiba, Naoshi Sugiyama, Shadows of Multi-Black Holes: Analytic Exploration, Phys. Rev. D86, 103001 (2012).

• Takeshi Chiba, The Constancy of the Constants of Nature: Updates, Prog. Theor. Phys. 126, 993 (2011).

• Daisuke Nitta, Takeshi Chiba, Naoshi Sugiyama, Shadows of Colliding Black Holes, Phys. Rev. D84, 063008 (2011).

• Takeshi Chiba, Masahide Yamaguchi, Runaway Domain Wall and Space-time Varying alpha, JCAP, 03 (2011) 044.

• Seiji Kawamura et al., The Japanese Space Gravitational Wave Antenna: DECIGO, Class. Quantum Grav., 28, 094011 (2011).

• Sachiko Kuroyanagi, Takeshi Chiba, Naoshi Sugiyama, Prospects for Direct Detection of Inflationary Gravitational Waves by Next Generation Inteferometric Detectors, Phys. Rev. D83, 043514 (2011).

• Takeshi Chiba, Kohei Kamada, Shinta Kasuya, Masahide Yamaguchi, Fate of Thermal Log Type Q Balls, Phys. Rev. D82, 103534 (2010).

• Takeshi Chiba, Masaru Siino, Masahide Yamaguchi, Slow-roll Extended Quintessence, Phys. Rev. D81, 083530 (2010).

• Takeshi Chiba, Kohei Kamada, Masahide Yamaguchi, Gravitational Waves from Q-ball Formation, Phys. Rev. D81, 083503 (2010).

• Masaki Ando et al., DECIGO and DECIGO Pathfinder, Class. Quantum Grav., 27, 084010 (2010).

• Takeshi Chiba, The Equation of State of Tracker Fields, Phys. Rev. D81, 023515 (2010).

• Takeshi Chiba, Sourish Dutta, Robert J. Scherrer, Slow-roll k-essence, Phys. Rev. D80, 043517 (2009).

• Sachiko Kuroyanagi, Takeshi Chiba and Naoshi Sugiyama, Precision Calculations of the Gravitational Wave Background Spectrum from Inflation, Phys. Rev. D79, 103501 (2009).

• Takeshi Chiba, Slow-Roll Thawing Quintessence, Phys. Rev. D79, 083517 (2009).

• Masaki Ando et al., DECIGO Pathfinder, Class. Quantum Grav., 26, 094019 (2009).

• Shuichi Sato et al., DECIGO: The Japanese Space Gravitational Wave Antenna, J.Phys.Conf.Ser. 154, 012040 (2009).

• Takeshi Chiba and Masahide Yamaguchi, Extended Slow-Roll Conditions and Primordial Fluctuations: Multiple Scalar Fields and Generalized Gravity, JCAP, 01 (2009) 019.

• Takeshi Chiba and Masahide Yamaguchi, Extended Slow-Roll Conditions and Rapid-Roll Conditions, JCAP, 10 (2008) 021.

• T. Akutsu et al., Development of a detector pair for very high frequency gravitational waves, J.Phys.Conf.Ser. 122, 012007 (2008).

• Seiji Kawamura et al., The Japanese Space Gravitational Wave Antenna - DECIGO, J.Phys.Conf.Ser. 122, 012006 (2008).

• Masaki Ando et al., DECIGO Pathfinder, J.Phys.Conf.Ser. 120, 032005 (2008).

• Seiji Kawamura et al., The Japanese Space Gravitational Wave Antenna; DECIGO, J.Phys.Conf.Ser. 120, 032004 (2008).

• Takeshi Chiba, Initial Conditions for Vector Inflation, JCAP, 08(2008)004.

• Tomotada Akutsu et al., Search for a Stochastic Background of 100 MHz Gravitational Waves with Laser Interferometers, Phys. Rev. Lett. 101, 101101 (2008).

• Takeshi Chiba, Tristan L. Smith and Adrienne L. Erickcek, Reply to "Comments on 'Solar System constraints to general f(R) gravity'", Phys. Rev. D77, 108502 (2008).

• Atsushi Nishizawa et al., Optimal Location of Two Laser-interferometric Detectors for Gravitational Wave Backgrounds at 100 MHz, Class. Quantum Grav., 25, 225011 (2008).

• Atsushi Nishizawa et al., Laser-interferometric Detectors for Gravitational Wave Background at 100 MHz: Detector Design and Sensitivity, Phys. Rev. D77, 022002 (2008).

• Takeshi Chiba and Takashi Nakamura, A Null Test of the Cosmological Constant, Prog. Theor. Phys. 118, 815-819 (2007).

• Takeshi Chiba, Yoshiaki Himemoto, Masahide Yamaguchi, Jun'ichi Yokoyama, Effective Search Templates for a Primordial Stochastic Gravitational Wave Background, Phys. Rev. D76, 043516 (2007).

• Takeshi Chiba and Ryuichi Takahashi, Consistency Relation in Cosmology, Phys. Rev. D75, 101301(R) (2007).

• Ryuichi Takahashi and Takeshi Chiba, Weak Lensing of Galaxy Clusters in MOND, Astrophys.J. 671, 45-52 (2007).

• Takeshi Chiba, Tristan L. Smith and Adrienne L. Erickcek, Solar System Constraints to General f(R) Gravity, Phys. Rev. D75, 124014 (2007).

• Takeshi Chiba, Tatsuo Kobayashi, Masahide Yamaguchi, and Jun'ichi Yokoyama, Time Variation of the Proton-electron Mass Ratio and the Fine Structure Constant with a Runaway Dilaton, Phys. Rev. D75, 043516 (2007).

• Seiji Kawamura et al., The Japanese space gravitational wave antenna-DECIGO, Class. Quantum Grav., 23, S125-S131 (2006).

• Takeshi Chiba, w and w' of Scalar Field Models of Dark Energy, Phys. Rev. D73, 063501 (2006).

• Takeshi Chiba, Generalized Gravity and Ghost, JCAP,03(2005)008.

• Takeshi Chiba, Ryuichi Takahashi and Naoshi Sugiyama, Classifying the Future of Universes with Dark Energy, Class. Quantum Grav., 22, 3745-3758 (2005).

• Satsuki Shimono, Takeshi Chiba, Numerical Solutions of Inflating Higher Dimensional Global Defects, Physical Review D71, 084002 (2005).

• Takeshi Chiba and Naoshi Sugiyama, Does Positronium Form in the Universe?, JCAP,06(2004)003.

• Ryo Nagata, Takeshi Chiba, Naoshi Sugiyama, WMAP Constraints on Scalar-Tensor Cosmology and the Variation of the Gravitational Constant, Physical Review D69, 083512 (2004).

• Hiroyuki Tashiro, Takeshi Chiba, Misao Sasaki, Reheating After Quintessential Inflation and Gravitational Waves, Class. Quantum Grav., 21, 1761-1771 (2004).

• Takeshi Chiba, Fuminobu Takahashi, Masahide Yamaguchi, Baryogenesis in a Flat Direction with Neither Baryon nor Lepton Charge, Phys. Rev. Lett., 92, 011301 (2004)

• Takeshi Chiba, 1/R Gravity and Scalar-Tensor Gravity, Physics Letters B, 575, 1-3 (2003).

• Takeshi Chiba and Kazunori Kohri, Supernova Cosmology and the Fine Structure Constant, Progress of Theoretical Physics, 110, 195-199 (2003).

• Ryo Nagata, Takeshi Chiba, Naoshi Sugiyama, Observational Consequences of Evolution of Primordial Fluctuations in Scalar-Tensor Cosmology, Physical Review D66, 103510 (2002).

• Takeshi Chiba, Tracking k-essence, Physical Review D66, 063514 (2002).

• Takeshi Chiba and Kazunori Kohri, Quintessence Cosmology and Varying alpha, Progress of Theoretical Physics, 107, 631-636 (2002).

• Takeshi Chiba and Ryuichi Takahashi, Lens Model Degeneracy and Cosmological Tests by Strong Gravitational Lensing, Progress of Theoretical Physics, 107, 625-630 (2002).

• Takeshi Chiba, Constancy of the Constants of Nature, In the Proceedings of Frontier of Cosmology and Gravitation, (YITP, Kyoto, April 25-27, 2001).(gr-qc/0110118)

• Ryuichi Takahashi and Takeshi Chiba, Gravitational Lens Statistics and Density Profile of Dark Halos, The Astrophysical Journal, 563, 489-496 (2001).

• Takeshi Chiba, Extended Quintessence and its Late-time Domination, Physical Review D64, 103503 (2001).

• Takashi Nakamura and Takeshi Chiba, Determining the Equation of State of the Expanding Universe Using a New Independent Variable, The Astrophysical Journal, 550, 1-6 (2001).

• Takeshi Chiba and Takashi Nakamura, Feasibility of Reconstructing the Quintessential Potential Using SNIa Data, Physical Review D62, 121301(R) (2000).

• Takeshi Chiba, Scalar-Tensor Gravity in a Two 3-brane System, Physical Review D62, 021502(R) (2000).

• Takeshi Chiba, Takahiro Okabe, and Masahide Yamaguchi, Kinetically Driven Quintessence, Physical Review D62, 023511 (2000).

• Takeshi Chiba and Masahide Yamaguchi, Extended Open Inflation, Physical Review D61, 027304 (2000).

• Takeshi Chiba, Quintessence, the Gravitational Constant, and Gravity, Physical Review D60, 083508 (1999).

• Takashi Nakamura and Takeshi Chiba, Determining the Equation of State of the Expanding Universe: Inverse Problem in Cosmology, Monthly Notices of the Royal Astronomical Society, 306, 696-700 (1999).

• Takeshi Chiba, Apparent Horizon Formation and Hoop Conjecture in Non-axisymmetric Spaces, Physical Review D60, 044003 (1999).

• Takeshi Chiba, Numerical Study of Inhomogeneous Pre-Big-Bang Inflationary Cosmology, Physical Review D59, 083508 (1999).

• Takeshi Chiba, Resolving the singularity of the Hawking-Turok type instanton, Physics Letters B, 442, 59-62 (1998).

• Takeshi Chiba and Takashi Nakamura, The Luminosity Distance, the Equation of State, and the Geometry of the Universe, Progress of Theoretical Physics, 100, 1077-1082 (1998).

• Takeshi Chiba, Naoshi Sugiyama, Takashi Nakamura, Observational tests of x-matter models, Monthly Notices of the Royal Astronomical Society, 301, 72-80 (1998).

• Takeshi Chiba, Naoshi Sugiyama, Jun'ichi Yokoyama, Imprints of the Metrically-coupled Dilaton on Density Perturbations in Inflationary Cosmology, Nuclear Physics, B530, 304-324 (1998).

• Kunihito Ioka, Takeshi Chiba, Takahiro Tanaka, Takashi Nakamura, Black Hole Binary Formation in the Expanding Universe -Three Body Problem Approximation -, Physical Review, D58, 063003 (1998).

• Takeshi Chiba, Ken-ichi Nakao, Kei-ichi Maeda, Taro Tsukamoto, Two Boosted Black Holes in Asymptotically de Sitter Space-Time - Relation between Mass and Apparent Horizon Formation -, Physical Review, D57, 6119-6126 (1998).

• Takeshi Chiba, Tomohiro Harada, Ken-ichi Nakao, Gravitational Physics in Scalar-Tensor Theories -tests of strong field gravity-, in Perturbative and Numerical Approaches to Gravitational Waves, Progress of Theoretical Physics Supplement, 128, 335-372 (1997).

• Takeshi Chiba, Generality of inflation and constraints on scalar-tensor theories of gravity, Classical and Quantum Gravity, 14, 2951-2961 (1997).

• Takeshi Chiba, Shinji Mukohyama, Takashi Nakamura, The Anisotropy of Cosmic Background Radiation implies the Violation of the Strong Energy Condition in Bianchi type I universe, Physics Letters, B408, 47-51 (1997).

• Takeshi Chiba, Naoshi Sugiyama, Takashi Nakamura, Cosmology with x-matter, Monthly Notices of the Royal Astronomical Society, 289, L5-L9 (1997).

• Takeshi Chiba and Masaru Siino, Disappearance of Black Hole Criticality in Semiclassical General Relativity, Modern Physics Letters A, 12 709-718 (1997).

• Takashi Nakamura, Hideya Uehara, Takeshi Chiba, The Minimum Mass of the First Stars and the Anthropic Principle, Progress of Theoretical Physics, 97, 169-171 (1997).

• Tomohiro Harada, Takeshi Chiba, Ken-ichi Nakao, Takashi Nakamura, Scalar Gravitational Waves from Oppenheimer-Snyder Collapse in Scalar-Tensor Theories of Gravity, Physical Review, D55, 2024-2037 (1997).

• Takeshi Chiba and Jiro Soda, Critical Behavior in the Brans-Dicke theory of Gravitation, Progress of Theoretical Physics, 96, 567-574 (1996).

• Takeshi Chiba, Applying gradient expansion to a perfect fluid and higher dimensions, General Relativity and Gravitation, 28, 1089-1106 (1996).

• Takeshi Chiba, Cylindrical Dust Collapse in General Relativity - toward higher dimensional collapse -, Progress of Theoretical Physics, 95, 321-338 (1996).

• Takashi Nakamura, Ken-ichi Nakao, Takeshi Chiba, Tetsuya Shiromizu, The Volume Expansion Rate and the Age of the Universe, Monthly Notices of the Royal Astronomical Society, 276, L41-L44 (1995).

• Ken-ichi Nakao, Naoteru Gouda, Takeshi Chiba, Satoru Ikeuchi, Takashi Nakamura, Masaru Shibata, The Hubble Parameter in a Void Universe - Effect of the Peculiar Velocity -, The Astrophysical Journal, 453, 541-544 (1995).

• Takeshi Chiba and Kei-ichi Maeda, Cosmic Hoop Conjecture?, Physical Review, D50, 4903-4913 (1994).

• Takeshi Chiba, Ken-ichi Nakao, Takashi Nakamura, Prohibition of Large Inhomogeneity in the Preinflationary Stage, Physical Review, D49, 3886-3892 (1994).

• Takeshi Chiba, Takashi Nakamura, Ken-ichi Nakao, Misao Sasaki, Hoop Conjecture for Apparent Horizon Formation, Classical and Quantum Gravity, 11, 431-441 (1994).