• 71 Citations
  • 3 h-Index
19972014
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Research Output 1997 2014

  • 71 Citations
  • 3 h-Index
  • 8 Article
  • 1 Review article
2014

Noncommutative spacetime realized in AdSn+1 space: Nonlocal field theory out of noncommutative spacetime

Naka, S., Toyoda, H., Takanashi, T. & Umezawa, E., 04-2014, In : Progress of Theoretical and Experimental Physics. 2014, 4, 043B03.

Research output: Contribution to journalArticle

symmetry
wave equations
relativity
generators
2010
1 Citation (Scopus)

Multi-shelled q-ball imaging: Moment-based orientation distribution function

Umezawa, E., Yoshikawa, M., Ohno, K., Yoshikawa, E. & Yamaguchi, K., 01-12-2010, In : Magnetic Resonance in Medical Sciences. 9, 3, p. 119-129 11 p.

Research output: Contribution to journalArticle

Corpus Callosum
Cerebrum
Direction compound
2006
4 Citations (Scopus)

q-Space imaging using small magnetic field gradient

Umezawa, E., Yoshikawa, M., Yamaguchi, K., Ueoku, S. & Tanaka, E., 01-12-2006, In : Magnetic Resonance in Medical Sciences. 5, 4, p. 179-189 11 p.

Research output: Contribution to journalArticle

Magnetic Fields
Magnetic Resonance Imaging
Equipment and Supplies
Water
2003

Basic theory of fast scan cine MRI

Yamaguchi, K., Muto, K., Umezawa, E., Kuwayama, Y. & Kondo, T., 01-01-2003, In : Nippon rinsho. Japanese journal of clinical medicine. 61 Suppl 4, p. 287-293 7 p.

Research output: Contribution to journalReview article

26 Citations (Scopus)

Lorentz Invariance and the Unitarity Problem in Non-Commutative Field Theory

Morita, K., Okumura, Y. & Umezawa, E., 11-2003, In : Progress of Theoretical Physics. 110, 5, p. 989-1001 13 p.

Research output: Contribution to journalArticle

subtraction
invariance
approximation
33 Citations (Scopus)

Lorentz-invariant non-commutative space-time based on DFR algebra

Kase, H., Morita, K., Okumura, Y. & Umezawa, E., 01-04-2003, In : Progress of Theoretical Physics. 109, 4, p. 663-685 23 p.

Research output: Contribution to journalArticle

algebra
operators
Lorentz transformations
Minkowski space
commutators
2000
2 Citations (Scopus)

Bi-local Higgs-like fields based on non-commutative geometry

Naka, S., Abe, S., Umezawa, E. & Matsufuji, T., 02-2000, In : Progress of Theoretical Physics. 103, 2, p. 411-423 13 p.

Research output: Contribution to journalArticle

scalars
geometry
hadrons
broken symmetry
bosons
1998
2 Citations (Scopus)

Constraints among coupling constants in noncommutative geometry models

Umezawa, E., 01-01-1998, In : Progress of Theoretical Physics. 100, 2, p. 375-394 20 p.

Research output: Contribution to journalArticle

geometry
Higgs bosons
1997
3 Citations (Scopus)
constrictions
tuning
phenomenology
Higgs bosons
optimization