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Theoretical Physics Laboratory
Hikaru KAWAI
Chief Scientist
Hikaru KAWAI (D.Sci.)
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Research Areas

The aim of this laboratory is to reveal the laws of nature ranging from elementary particles to the universe. More precisely, the following three issues are pursued with their mutual relations emphasized:(1) Understanding the microscopic fundamental law of nature. In particular, trying to give a consistent definition of superstring and derive all the fundamental laws from one principle. (2) Understanding many-body systems. Both of the following two aspects are considered. One is the universal laws such as thermodynamics and the universality of spin systems, and the other is specific properties of individual systems such as hadrons, condensed matter, and the universe. (3) Computational science. Besides numerical analyses as an important tool for the above mentioned (1) and (2), aspects of fundamental mathematics are also pursued.

Research Subject

  1. Constructive Definition of String Theory as Fundamental law of Physics
  2. Fundamental aspects of Quantum Field Theory and its applications
  3. High precision inspection of experimental and observational data

Press release

August 22, 2007
The Theoretical Physics Laboratory in the Sub Nuclear System Research Division of the Nishina Center for Accelerator Based Science, in association with Nagoya University and Cornell University of the US, has succeeded in a one-trillionth refinement of the accuracy of calculation of a number expressing the magnetism of the electron known as the g-factor.
April 22, 2008
Computation of the vacuum energy of the elementary particle world
(Numerical simulation of the possibility of the spontaneous corruption of supersymmetry)

RIKEN RESEARCH

December 15, 2006
Completing superstring theory?the ultimate theory of matter New Window
September 19, 2008
Closing the gap in understanding a broken symmetry A 'toy' theoretical model may advance our understanding of a fundamental concept in particle physics New Window

List of Selected Publications

  1. Kawai, H., Kawamoto, S., Kuroki, T., Matsuo, T., and Shinohara, S.:
    "Mean Field Approximation of IIB Matrix Model and Emergence of Four Dimensional Space-Time. Nucl. Phys. B647, 153-189 (2002).
  2. Hayakawa, M. and Kinoshita, T.:
    "PSEUDOSCALAR POLE TERMS IN THE HADRONIC LIGHT-BY-LIGHT SCATTERING CONTRIBUTION TO MUON G - 2."
    Phys. Rev. D57, 465-477 (1998), Erratum-ibid. D66, 019902 (2002).
  3. Aoki, H., Iso, S., Kawai, H., Kitazawa, Y., and Tada, T.:
    "Space-Time Sturectures from IIB Matrix Model."
    Prog. Theor. Phys. 99, 713-746 (1998).
  4. Ishibashi, N., Kawai, H., Kitazawa, Y., and Tsuchiya, A.:
    "A LARGE N REDUCED MODEL AS SUPERSTRING."
    Nucl. Phys. B498, 467-491 (1997).
  5. Distler, J. and Kawai, H.:
    "CONFORMAL FIELD THEORY AND 2-D QUANTUM GRAVITY."
    Nucl. Phys. B321, 509 (1989).
  6. Gabrielse, G., Hanneke, D., Kinoshita, T., Nio, M., and Odom, B.:
    "New Determination of the Fine Structure Constant from the Electron g Value and QED."
    Phys. Rev. Lett. 97, 030802 (2006)
  7. Hayakawa, M., So, H., and Suzuki, H.:
    "Overlap lattice fermion in a gravitational field."
    Prog. Theor. Phys. 116, 197(2006)
  8. Hanada, M., Hayakawa, M., Ishibashi, N., Kawai, H., Kuroki, T., Matsuo, Y., and Tada, T.:
    "Loops versus matrices: The nonperturbative aspects of noncritical string."
    Prog. Theor. Phys. 112, 131 (2004)
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