Yoshio Koide

Yoshio Koide (小出 義夫, Koide Yoshio, born May 16, 1942 in Kanazawa, Ishikawa) is a Japanese theoretical physicist specializing in particle physics. Koide is famous for his eponymous Koide formula, which some physicists think has great importance while other physicists contend that the formula is merely a numerical coincidence.

Biography

Koide earned in 1967 a B.Sc. with major in physics and in 1967 a M.Sc. in Theoretical Elementary Particle Physics from Kanazawa University. In 1970, he received his Doctor of Science degree from Hiroshima University with a thesis “On the Two-Body Bound State Problem of Dirac Particles”.[1] After working as a postdoc in the physics department of Hiroshima University and then a postdoc in the applied mathematics department of Osaka University, he became, from 1972 to 1973, a Lecturer in the School of Science and Engineering, Kinki University, Osaka. Koide was Assistant Professor (1973-1977) then Associate Professor (1977-1987) of General Education, Shizuoka Women's University, Shizuoka. From April 1987 to March 2007 he was a Professor of Physics at University of Shizuoka, Shizuoka and then retired as professor emeritus. In 1986 he was a visiting professor at the University of Maryland and in 2002 a visiting researcher at CERN. Koide was from April 2007 to March 2009, a guest professor at Research Institute for Higher Education and Practice, Osaka University, then from April 2009 to March 2011 a guest professor and from April 2011 a guest researcher at Osaka University, and from April 2010 a professor, Department of Maskawa Institute, Kyoto Sangyo University, Kyoto.

In the composite model of mesons, Koide's thesis demonstrated that a mass of a composite particle which consists of the rest masses cannot be lighter than except for the case when JP is not = 0-. This offered a severe problem for the quark model. (Koide’s work was done before the establishment of QCD.)[1]

Katuya and Koide predicted that lifetimes of D± and D0 should be considerably different from what was at that time the conventional anticipation tau(D±)= tau(D0). Their prediction of these lifetimes was the first in the world prior to the experimental observation.[2]

He published the famous Koide formula in 1982[3] with a different presentation in 1983.[4]

Originally, Koide's proposed charged lepton mass formula was based on a composite model of quarks and leptons. In a 1990 paper, from the standpoint that the charged leptons are elementary, by introducing a scalar boson with (octet + singlet) of a family symmetry U(3), Koide re-derived the charged lepton mass formula from minimizing conditions for the scalar potential.[5]

In 2009, he related the neutrino mixing matrix to the up-quark mass matrix.[6]

gollark: Surely you can just pull a particular tag of the container.
gollark: I can come up with a thing to transmit ubqmachine™ details to osmarks.net or whatever which people can embed in their code.
gollark: It's an x86-64 system using debian or something.
gollark: > `import hashlib`Hashlib is still important!> `for entry, ubq323 in {**globals(), **__builtins__, **sys.__dict__, **locals(), CONSTANT: Entry()}.items():`Iterate over a bunch of things. I think only the builtins and globals are actually used.The stuff under here using `blake2s` stuff is actually written to be ridiculously unportable, to hinder analysis. This caused issues when trying to run it, so I had to hackily patch in the `/local` thing a few minutes before the deadline.> `for PyObject in gc.get_objects():`When I found out that you could iterate over all objects ever, this had to be incorporated somehow. This actually just looks for some random `os` function, and when it finds it loads the obfuscated code.> `F, G, H, I = typing(lookup[7]), typing(lookup[8]), __import__("functools"), lambda h, i, *a: F(G(h, i))`This is just a convoluted way to define `enumerate(range))` in one nice function.> `print(len(lookup), lookup[3], typing(lookup[3])) #`This is what actually loads the obfuscated stuff. I think.> `class iｎt(typing(lookup[0])):`Here we subclass `complex`. `complex` is used for 2D coordinates within the thing, so I added some helper methods, such as `__iter__`, allowing unpacking of complex numbers into real and imaginary parts, `abs`, which generates a complex number a+ai, and `ℝ`, which provvides the floored real parts of two things.> `class Mаtrix:`This is where the magic happens. It actually uses unicode homoglyphs again, for purposes.> `self = typing("dab7d4733079c8be454e64192ce9d20a91571da25fc443249fc0be859b227e5d")`> `rows = gc`I forgot what exactly the `typing` call is looking up, but these aren't used for anything but making the fake type annotations work.> `def __init__(rows: self, self: rows):`This slightly nonidiomatic function simply initializes the matrix's internals from the 2D array used for inputs.> `if 1 > (typing(lookup[1]) in dir(self)):`A convoluted way to get whether something has `__iter__` or not.
gollark: If you guess randomly the chance of getting none right is 35%ish.

References
  1. Koide, Y. (1968). "On the Two-Body Bound State Problem of Dirac Particles". Progress of Theoretical Physics. 39 (3): 817–829. Bibcode:1968PThPh..39..817K. doi:10.1143/PTP.39.817.
  2. Katuya, M.; Koide, Y. (1979). "Is the 20-dominance model valid in charm decays, too?". Physical Review D. 19: 2631–2634. Bibcode:1979PhRvD..19.2631K. doi:10.1103/PhysRevD.19.2631.
  3. Koide, Y. (1982). "Fermion-boson two-body model of quarks and leptons and cabibbo mixing". Lettere al Nuovo Cimento. 34 (8): 201–205. doi:10.1007/BF02817096.
  4. Y. Koide (1983). "A fermion-boson composite model of quarks and leptons". Physics Letters B. 120 (1–3): 161–165. Bibcode:1983PhLB..120..161K. doi:10.1016/0370-2693(83)90644-5.
  5. Koide, Y. (1990). "Charged Lepton Mass Sum Rule from U(3)-FAMILY Higgs Potential Model". Mod. Phys. Lett. A. 5 (28): 2319–2323. Bibcode:1990MPLA....5.2319K. doi:10.1142/S0217732390002663.
  6. Koide, Y. (2009). "Yukawaon model in the quark sector and nearly tribimaximal neutrino mixing". Phys. Lett. B. 680 (1): 76–80. arXiv:0904.1644. Bibcode:2009PhLB..680...76K. doi:10.1016/j.physletb.2009.08.038.,
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