Thermo field dynamics of quantum spin systems
Journal Article
·
· J. Stat. Phys.; (United States)
Thermo field dynamics of quantum spin systems is formulated to give a new variational principle at finite temperatures. The KMS relation is reformulated as identities among thermal vacuum states. Path integral formulations of the thermal vacuum state are given which yield a new ''thermo field Monte Carlo method.'' Thermo field dynamics of finite-spin systems are studied in detail as simple examples of the present method. Perturbation expansion methods of the thermal state and time-dependent state are also given.
- Research Organization:
- Univ. of Tokyo, Tokyo
- OSTI ID:
- 6844999
- Journal Information:
- J. Stat. Phys.; (United States), Journal Name: J. Stat. Phys.; (United States) Vol. 42:5-6; ISSN JSTPB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR MOMENTUM
ANTIFERROMAGNETISM
BOSE-EINSTEIN GAS
FERMI GAS
FIELD THEORIES
FLUIDS
GASES
HAMILTONIANS
HEISENBERG PICTURE
KUBO FORMULA
MAGNETISM
MATHEMATICAL OPERATORS
MONTE CARLO METHOD
PARTICLE PROPERTIES
PERTURBATION THEORY
QUANTUM FIELD THEORY
QUANTUM OPERATORS
SPIN
SPINOR FIELDS
THERMODYNAMICS
TIME DEPENDENCE
VACUUM STATES
VARIATIONAL METHODS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR MOMENTUM
ANTIFERROMAGNETISM
BOSE-EINSTEIN GAS
FERMI GAS
FIELD THEORIES
FLUIDS
GASES
HAMILTONIANS
HEISENBERG PICTURE
KUBO FORMULA
MAGNETISM
MATHEMATICAL OPERATORS
MONTE CARLO METHOD
PARTICLE PROPERTIES
PERTURBATION THEORY
QUANTUM FIELD THEORY
QUANTUM OPERATORS
SPIN
SPINOR FIELDS
THERMODYNAMICS
TIME DEPENDENCE
VACUUM STATES
VARIATIONAL METHODS