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Yasue Laboratory For Elementary Particle Theory 

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The 2015 Nobel Prize in Physics "for the discovery of neutrino oscillations, which shows that neutrinos have mass"
In our theory group, we have studied theoretical aspects in neutrino oscillations from 1998 through this year.  Our current interest lies in the puzzle why a plenty of antimatter which was present in the early universe just after the BigBang have disappeared to form our universe filled with matter but without antimatter. This puzzle may be solved if neutrino masses, which are theoretically described by real numbers because they are measured by experiments, are generated by complex numbers.
Research
My research is aiming at answering a question of "what a thing is made of?". If we are based on a theory that at fast, space was a high-temperature and high-pressure fireball (Big Bang), it follows that all materials "melt." However, "basic constituent elements (elementary particles)", which remained insoluble as particles, are considered to make up vast amounts of things ranging from space to us human beings. At present, such particles known up to the present are 6 types of quarks (triplets each), 6 types of leptons (a kind of electrons) and boson (a kind of light) which serves as "glue" to make protons, hydrogen atoms, molecules, proteins, DNA and so on by collecting such quarks and leptons. In addition to these, we suppose that there may be new "constituent elements" or that such new constituent elements may be composed of other types of basic constituent elements, and formulate various kinds of "scenarios" to investigate into their theoretical consistency. I have recently conducted research for theoretically clarifying "the wonders of neutrino." Although matter made of elementary particles spread in our universe is really "normal" matter, we can artificially create anti-matter made of anti-elementary particles inside high-energy particle accelerators. Such anti-matter and "normal" matter instantaneously disappear when they meets each other. However, anti-matter is considered to fill everywhere in our universe at Big Bang, where ultra high temperature universe can copiously produce "normal" matter and anti-matter so that both are simultaneously present at that epoch. The question is "Why our universe at present has no anti-matter?", "Where has it gone?" and "Why and how does "normal" matter remain as matter in our universe?". To answer these questions, I have started new research project, where I uses mysterious neutrinos to create more "normal" matter than anti-matter.

On the basis of Elementary Particle Physics, our laboratory studies various properties of "elementary particles" including quarks and leptons and their hypothetical constituents, preons or subquarks, which make observed matter ranging from protons and neutrons to the whole Universe. These elementary particles interact with each other and are bound together into more complex matter. Also studied are origins and forms of these interactions and their unification, which enable us to formulate a theory that only one force creates various different interactions. Currently, superstrings are believed to serve as one of the promising theories to unify gravitational interactions with strong and electroweak interactions.

New Results 2010-2016
Grants-in-Aid for Scientific Research on Priority Areas A "Neutrino Oscillations and Their Origin" (2000-2001:Completed)
I was and am also been paying my attention to clarify properties of neutrinos.  My research activity was financially supported by  the Grant-in-Aid for Scientific Research, Ministry of Education, Science and Culture, Japan.  My  research project name was

  • Neutrino Mass Creation by Radiative Mechanism.
Japanese experimental group called the Kamiokande collaboration has first confirmed that neutrinos certainly have masses.  The Nishijima laboratory at our department has performed experiments at Kamioka as a part of the  Komiokande research activities. 

Grants-in-Aid for Scientific Research on Priority Areas"Superstring Theory and Dynamics of Field Theory" (2001-2006)
I have been investigating how we understand nonperturbative physics of strongly coupled supersymmetric gauge theories such as QCD based on SU(Nc) and those based on SO(Nc).  My  research project name is
  • Nonperturbative Dynamics of Supersymmetric Gauge Theories and its Effects on Quark-Lepton Physics

Contrary to the current common understanding of the preservation of flavor symmetries, I have recognized that dynamical breakdown of flavor symmetries is found to occur as a result of nonperturbative supersymmetric dynamics.

Key Words
  • Theoretical high-energy physics
  • Models beyond the standard electroweak model
  • Phenomenology of quark-lepton physics
  • Compositeness of quarks and leptons
  • Origin of the quark-lepton mass spectrum
  • Strongly coupled supersymmetric gauge theories
  • Symmetry breaking mechanism
  • Creation mechanism of neutrino masses and Leptonic CP violation

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Correspondence
If you are interested in my research activities, please do not hesitate to contact us.

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Last update: 2017/10/25

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