Hiroomi Umezawa

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Hiroomi Umezawa
Born (1924-09-20)September 20, 1924
Kurihashi, Saitama, Japan
Died March 24, 1995(1995-03-24) (aged 70)
Edmonton, Alberta, Canada
Alma mater Nagoya University, Japan
University of Wisconsin–Milwaukee, Wisconsin, USA
University of Alberta, Canada
Known for Quantum field theory
Awards Killam Memorial Chair, University of Alberta
Scientific career
Fields Theoretical physics
Institutions University of Tokyo, Japan
University of Naples, Italy

Hiroomi Umezawa (梅沢 博臣, Umezawa Hiroomi) (September 20, 1924 – March 24, 1995) was a physicist and Distinguished Professor in the Department of Physics at the University of Wisconsin–Milwaukee.[1] He is known for his fundamental contributions to quantum field theory and for his work on quantum phenomena in relation to the mind.

Education, career and work[edit]

Umezawa obtained his PhD from Nagoya University, Japan in 1952. He worked at the University of Tokyo, Japan, and the University of Naples, Italy, and took up a position as professor at the University of Wisconsin–Milwaukee (UWM) in 1966, already considered a famous physicist at the time.[1] He joined the University of Alberta, Canada, in 1975 when he took the Killam Memorial Chair as Professor of Physics, a position which he held until his retirement in 1992.[1][2]

Umezawa is recognized as one of the eminent quantum field theorists of his generation.[1] He applied his results in quantum field theory also to high energy physics, condensed matter physics, nuclear physics and statistical physics, as well as his considerations of quantum theory and the mind.[1]

In 1967, together with L.M. Ricciardi he proposed a quantum theory of the brain a spatially distributed system forms in which spontaneous symmetry breaking at micro level forms a basis for processing at macro level. In this model, the information resides in the virtual field associated with the dynamics of the cellular matter. This model was subsequently expanded by Stuart, Takahashi and Umezawa with their proposal of the development of long range correlations among neurons due to the interaction of two quantum fields. The approach was built upon by many others, including Karl H. Pribram, and was later expanded by Giuseppe Vitiello to a dissipative quantum model of brain.[3][4][5]

Umezawa's scientific work has been characterized by his colleagues at UWM as "marked by extreme originality".[1]

Memorial fund[edit]

After his death in 1995, Umezawa's family, friends and students set up the Umezawa Fund in his memory, dedicated to support studies in physics; among the Memorial Distinguished Visitors has been physicist Gordon Baym of the University of Illinois in 2007.[6]


Books on quantum theory
  • H Umezawa; A Arimitsu, et al. (eds.): Selected papers of Hiroomi Umezawa, Tokyo, Japan (Published by Editorial Committee for Selected Papers of Hiroomi Umezawa), 2001
  • Hiroomi Umezawa: Advanced Field Theory: Micro, Macro, and Thermal Physics, American Institute of Physics, 1993, ISBN 978-1563960819
  • Hiroomi Umezawa, Giuseppe Vitiello: Quantum Mechanics, Bibliopolis, 1985
  • Hiroomi Umezawa, H. Matsumoto, Masashi Tachiki: Thermo field dynamics and condensed states, North-Holland Publishing Company, 1982, ISBN 978-0444863614
  • Hiroomi Umezawa: Quantum Field Theory, North-Holland Publishing Co., 1956

Articles on the quantum theory of mind:

  • C.I.J. Stuart, Y. Takahashi, H. Umezawa (1979): Mixed system brain dynamics: neural memory as a macroscopic ordered state, Foundations of Physics, vol. 9, pp. 301–307
  • C.I.J. Stuart, Y. Takahashi, H. Umezawa (1978): On the stability and non-local properties of memory, Journal of Theoretical Biology, vol. 31, pp. 605–618
  • L.M. Ricciardi, U. Umezawa (1967): Brain physics and many-body problems, Kibernetik, vol. 4, pp. 44–48


  1. ^ a b c d e f Memorial resolution: Professor Hiroomi Umezawa, University of Wisconsin-Milwaukee Faculty Document no. 2007, September 21, 1995 (downloaded October 21, 2012)
  2. ^ Killam Memorial Chairs, University of Alberta (downloaded 201 October 2012)
  3. ^ Giuseppe Vitiello, Dissipation and memory capacity in the quantum brain model, Int. J. Mod. Phys. B, 09, 973 (1995). DOI: https://dx.doi.org/10.1142/S0217979295000380 arXiv [1]
  4. ^ Giuseppe Vitiello, My Double Unveiled. The dissipative quantum model of brain, John Benjamins Publishing Co. Amsterdam, 2001, ISBN 9789027251527 (Eur), ISBN 9781588110763 (USA). DOI: 10.1075/aicr.32
  5. ^ Eliano Pessa, Giuseppe Vitiello, Quantum noise, entanglement and chaos in the quantum field theory of mind/brain states, Mind and Matter 1, 59 (2003). arXiv q-bio/0309009v1, submitted 21 September 2003
  6. ^ Annual Report of the University of Physics Institute, University of Alberta, for the period of July 1, 2006 - December 31, 2008, published March 2010, page 13 (downloaded October 21, 2012)

Further reading[edit]

External links[edit]