NAKAGAWA Koichi

J-GLOBAL         Last updated: Jan 7, 2017 at 16:00
 
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Name
NAKAGAWA Koichi
Affiliation
Hoshi University
Section
Faculty of Pharmaceutical Sciences General Subjects
Job title
Associate Professor
Degree
(BLANK)

Published Papers

 
Koichi Nakagawa
   Jan 2016
We investigate the quantum entanglement of systems of coupled harmonic
oscillators on the basis of thermo-field dynamics (TFD). For coupled harmonic
oscillators at equilibrium, the extended entanglement entropy is derived using
the TFD method, and...
Koichi Nakagawa
Hoshi Journal of General Education, No. 33, 2015, p.1-14   (33) 1-14   2015   [Refereed]
We apply a new method based upon thermofield dynamics (TFD) to study
entanglement of finite-spin systems with non-competitive external fields for
both equilibrium and non-equilibrium cases. For the equilibrium finite-spin
systems, the temperature ...
Koichi Nakagawa
Prog. Theor. Exp. Phys. (2015) 021A01      Oct 2014   [Refereed]
For the purpose of clarifying a new approach to understanding quantum
entanglement using thermofield dynamics (TFD), entanglement entropies of
non-equilibrium finite-spin systems are examined for both traditional and
extended cases. The extended e...
A New Approach to Quantum Entanglement by Thermofield Dynamics
NAKAGAWA Koichi
Hoshi Journal of General Education   (32) 1-11   2014   [Refereed]
On the possibility of observing TeV-scale gravity at the LHC
NAKAGAWA Koichi
Hoshi Journal of General Education   (31) 15-31   2013
Comments on the 1-loop Cosmological Constant in the Thermal Closed Bosonic String Theory
NAKAGAWA Koichi
Hoshi Journal of General Education   (30) 75-95   2012
Recent Developments in Research on the Rotating Black Hole Entropy
NAKAGAWA Koichi
Hoshi Journal of General Education   (29) 39-63   2011
Comments on Line , Surface and Volume Integrals in Elementary Physics
NAKAGAWA Koichi
Hoshi Journal of General Education   (28) 65-93   2010
Multiple Zeta Values and String Amplitudes
NAKAGAWA Koichi
Hoshi Journal of General Education   (27) 57-67   2009
A Prelude to Thermal Gauge Invariance in String Thermofield Dynamics
NAKAGAWA Koichi
Hoshi Journal of General Education   (26) 39-49   2008
A Note on the Wave Equation
NAKAGAWA Koichi
Hoshi Journal of General Education   (25) 41-67   2007
A Prelude to Thermal Cosmological Constant in String Thermofield Dynamics
NAKAGAWA Koichi
Hoshi Journal of General Education   (24) 29-44   2006
Stochastic Models in Chemical and Pharmaceutical Sciences
NAKAGAWA Koichi
Hoshi Journal of General Education   (23) 13-30   2005
On the p-brane dynamics (in Japanese)
Koichi Nakagawa
HOSHI JOURNAL OF GENERAL EDUCATION   (18) 11-20   2000
"Thermal Cosmological Constant in the Heterotic String Thermofield Dynamics"
(Universal Academy Press, Inc. , Tokyo)   247-249   1998
Heterotic-string thermofield dynamics
Nuovo Cimento   110A(2) 161   1997
Thermofield Dynamics of the Closed Bosonic String
soryushiron kenkyu   94(4) 34   1997
Europhysics Letters   35(7) 493-497   1996
H.Fujisaki and K.Nakagawa,"Thermofield Dynamics of the Closed Bosonic String-Thermal Cosmological Constant-", Cosmological Constant and the Evolution of the Universe, edited by K.Sato et al.
Universal Academy Press, Inc., Tokyo   249   1996
Europhysics Letters   28(7) 471-475   1994
Europhysics Letters   20(677)    1992
Progress of Theoretical Physics   85(6) 1317-1326   1991
Progress of Theoretical Physics   83(1) 18-21   1990
Progress of Theoretical Physics   81(3) 570-575   1989
Progress of Theoretical Physics   81(3) 565-569   1989
Progress of Theoretical Physics   82(6) 1017-1022   1989
The Thermal Stability of Renormalization of Open Bosonic Strings
Progress of Theoretical Physics   82(2) 236   1989

Misc

 
Koichi Nakagawa
   Jan 2016
We investigate the quantum entanglement of systems of coupled harmonic
oscillators on the basis of thermo-field dynamics (TFD). For coupled harmonic
oscillators at equilibrium, the extended entanglement entropy is derived using
the TFD method, and...
Koichi Nakagawa
   Sep 2015
We study the effect of frustration on entanglement of non-equilibrium
finite-spin systems with external fields using a method based on thermofield
dynamics (TFD). For this purpose, the extended density matrices and extended
entanglement entropies ...
November7-10, 1995,1st RESCEU Inernational Symposium "THE COSMOLOGICAL SONSTANT AND THE EVOLUTION OF THE UNIVERSE", "THERMOFIELD DYNAMICS OF THE CLOSED BOSONIC STRING-THERMAL COSMOLOGICAL CONSTANT-",H.Fujisaki, K.Nakagawa
   1995

Books etc

 
薬学生のための基礎シリーズ3 基礎物理学
NAKAGAWA Koichi (Part:Contributor, Chapeters 9 and 10)
Baifukan   2011   

Conference Activities & Talks

 
Entanglement Entropies of Non-Equilibrium Finite-Spin Systems
NAKAGAWA Koichi
Aug 2016   
Heterotic String Thermofield Dynamics
NAKAGAWA Koichi
Jan 1998   
THERMAL COSMOLOGICAL CONSTANT IN THE HETEROTIC STRING THERMOFIELD DYNAMICS
NAKAGAWA Koichi
3rd RESCEU International Symposium ``PARTICLE COSMOLOGY   Nov 1997   
Phase structure of cosmological constant of TFD heterotic string model
NAKAGAWA Koichi
Oct 1996   
Thermofield Dynamics of the Closed Bosonic String
NAKAGAWA Koichi
Aug 1996   
THERMOFIELD DYNAMICS OF THE CLOSED BOSONIC STRING - THERMAL COSMOLOGICAL CONSTANT -
NAKAGAWA Koichi
1st RESCEU International Symposium ``THE COSMOLOGICAL SONSTANT AND THE EVOLUTION OF THE UNIVERSE"   Nov 1995   
Infrared self-energy amplitude of thermal closed bosonic string
NAKAGAWA Koichi
Oct 1993   
Infrared self-energy amplitude of thermal closed bosonic string
NAKAGAWA Koichi
Jul 1993   
Type-I Neveu-Schwarz-Ramond Open Thermal Superstring
NAKAGAWA Koichi
Mar 1990   
Thermal stability of the renormalization of open bosonic strings
NAKAGAWA Koichi
Oct 1989   
Superstring model at finite temperature
NAKAGAWA Koichi
Oct 1988   

Works

 
November11-13,1997,3rd RESCUE International Symposium"PARTICLE COSMOLOGY", "THERMAL COSMOLOGICAL CONSTANT IN THE HETEROTIC STRING THERMOFIELD DYNAMICS"

Research Grants & Projects

 
Superstring Theories at Finite Temperature