derivation of coarse-grained transport equation - instruction for application -
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Derivation of Coarse-grained Transport Equation - Instruction for Application -. Presentation given at Beijing Normal University, October. 13, 2011. Fumihiko Sakata Professor Emeritus, Ibaraki University Member of the board of directors, Gushinkai Foundation. Introduction. - PowerPoint PPT PresentationTRANSCRIPT
Derivation of Coarse-grained Transport Equation- Instruction for Application -
Fumihiko SakataProfessor Emeritus, Ibaraki University
Member of the board of directors, Gushinkai Foundation
Presentation given atBeijing Normal University, October. 13, 2011
“new property could not be predicted from a knowledge of the
lower-level properties”“the whole is greater than the
composition of its parts”
emergence is specific for biological (living) system,
complex system, self-organizing system,
system of network, …Finite, self-sustained,Strongly interacting,nonlinear complex
system
Introduction
Organ System Animal
Emergence
Nucleus
Searching for Dynamics of Emergence (Evolution of Matter)
DOE-Project
Theoretical Nuclear Physics Ab-initio Calculation of Nuclear Structure and Reaction Green’s function Monte Carlo (GFMC) No-core shell model (NCSM) Nuclear Energy Density Functional Theory (EDFT)
What do we learn from numerical calculation
CoveringPhysics, Climate, Groundwater,
Fusion Energy, Life SciencesMaterials & Chemistry
Microscopic Equation
High-PerformanceComputer
Experiment
Science in the Era of High Performance Computer
Dynamicsof
Emergence
Black Box ?
京 (K) (Kobe, RIKEN AICS)天河 1A 号 (Tianhe-1A)(Tianjin, NSCC)Jaguar(Tennessee, ORNL)
There are no general quantum many-body reaction theory !!
What actually happens in HI-DIC, nuclear fusion and fission ・ microscopic origin of dissipation and fluctuation described in macroscopic variables・ role of one- and two-body dissipation (mean-field and correlation/macro and micro)・ role of adiabatic- and diabatic-mean field・ role of macro (mean field) variables (window, wall, neck, asymmetry, friction,…)・ role of various reaction process (one, two and many nucleon transfer, successive transfer,…)
http://euroball.lnl.infn.it/ECTbigs/talks/Bob_Chapman.pdf
V.I.Zagrebaev, PRC64,034606(2001)
superposition of nn-scattering two body scattering
How to understand Emergence Dynamics in Nuclei
Microscopic Equation
Time-Dependent Variational Principle (principle of least action)There are no general quantum many-body reaction theory !! (Later discussion)Simulation is needed like gravitational n-body problem
TDVP associates to a Hamiltonian quantum system a set of trajectories running on a classical phase space
Canonical Eqs. of Motion
Classical image (e.g.; Wigner transformation)
Numerical Simulation describing - Change of Nuclear Structure as well as Reaction Process -
Time-Dependent Hartree Fock (mean field: ph-amplitudes) Fermion Molecular Dynamics (wave packet: central values of coordinate & momentum)
Gaussian wave packet
Trial state for N nucleon system
Basic equation of FMD
How to describe different reaction channel
spatial⊗ spin&isospin
Elastic, Inelastic A(a, a’)A’ Transfer ReactionA(a, b)B : B=A+n, a=n+b
+ + various sequential Reactions
j(A) Intrinsic coordinate of system A
Elastic and inelastic Collision
Single-Nucleon Transfer Reaction
General Hamiltonian in parameter space
Hamiltonian in elastic and inelastic collision
Center of mass + Intrinsic + Relative + Coupling
How to understand Numerical Simulation
Liouville Equation for Distribution Function (t)
Time Development of Dynamical Variable B(t)
There holds a relation
Multi-Channel Reaction
Relevant dofIrrelevant dof
is determined by numerical simulation
Suppose an exact calculation has been done, and the following two conditions are satisfied;
Consider a time evolution from to We already have
Let us introduce projection of dynamical variable onto relevant space at time
During time interval t (macroscopically short, but microscopically long), coupling effects from the relevant dof onto the irrelevant system are negligible
relavant motion is described by single (mean) trajectory (like Langevin), irrelevant motion by distribution function (like molecular motion for Brownian particle)
Coarse-grained dimension
Coarse-grained transport equation
Expand with respect todissipation force and random force are given perturbatively
Generally, tI dependent time-independent when chaos develops in system
Let us introduce
Approximation
with
is defined by the conditionGeneralized local FD theorem
TDHF basic dynamics and anti-symmetrization are included FMD quantum mechanical
V.I.Zagrebaev, PRC64,034606(2001)
Some Remarks
Simplifications are needed same width of wave packets anti-symmetrization: let us start with a few high momentum nucleons are transferred (N+M), (N+1,M-1)+/-(N-1,M+1),…are important wall (mean potential ) of initial nuclei are important
determinant expanded in small determinants
Extension of parameter space nucleon expressed by two Gaussian