labyrinth chaos: non-hamiltonian, conservative, elegant, without …€¦ · 6th dynamics days...
TRANSCRIPT
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Labyrinth Chaos: Non-Hamiltonian,
Conservative, Elegant,
without any attractors!
25 / 2 / 2020
Presented by Vasileios Basios
6th Dynamics Days Central Asia
Online conference, 2-5 June 2020, Nur-Sultan, Kazakhstan
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● https://arxiv.org/abs/2004.14336
A. Latifi
Department of Physics, Faculty of Sciences, Qom University of Technology, Qom,Iran.
E-mail: [email protected]
C. Antonopoulos
Department of Mathematical Sciences, University of Essex, Wivenhoe Park, CO4 3SQ, UK.
E-Mail: [email protected]
V. Basios
Interdisciplinary Centre for Nonlinear Phenomena & Complex Systems (Cenoli-ULB) & Département de Physique des Systèmes Complexes et Mécanique Statistique, University of Brussels (ULB), Brussels.
E-mail: [email protected]
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Feedback Circuits, Cycles, ogicTopology
Int. J. of Bifurcation and Chaos 23:09.(2013)
Rene Thomas Otto Roessler
Leonid ShilnikovGregoire Nicolis
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● By the term circuits we refer to those sets of terms of the Jacobian matrix of the dynamical system whose row and column indices are in circular permutation
● Circuits are positive or negative according to the sign of the product of their terms.
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Non-linear Arabesques A1n3: (chaos with just one cubic nonlinearity)
Frontiers: F1: sign of the product of the (real)
eigenvalues of J changes: sign( P)= sign( (-1)n det[J] )
F2: sign of the real / imaginary part changes
F4: (boundary) eigenvalues change from real to complex
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3D- Labyrinth Chaos Thomas-Rőssler Systems
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Lyapunov exponents for the 3D Labyrinth Chaos
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b=0.19 periodic
orbit
b=0.2 coexisting attractors
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b = 0 : Labyrinth Chaos
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With n = 1, … N = 2m+1Is there a hidden “Hamiltonian”-like structure?Implicitly assumed yes … but
Labyrinth Chaos (N=5)
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Int. J. of Bif. and Chaos, 17, 6 (2007), pp 2097–2108 “LABYRINTH CHAOS”, J. C. Sprott, K. E. Chlouverakis
SIX coexisting attractors! b=0.203
N=3
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Int. J. of Bif. and Chaos, 17, 6 (2007), pp 2097–2108, “LABYRINTH CHAOS”, J. C. Sprott, K.E. Chlouverakis
Invariant Density:
Fractional Brownian MotionHurst Exponent ~ 0.61 > 1/2
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“Hyperchaos & Labyrinth Chaos: revisiting Thomas-Rossler systems”V. Basios , C.G. Antonopoulos, J. Theor. Biol. 460:153-159, (2019)
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“Hyperchaos & Labyrinth Chaos: revisiting Thomas-Rossler systems”V. Basios , C.G. Antonopoulos, J. Theor. Biol. 460:153-159, (2019)
Chimera states 1:
Labyrinth Chaos&Complex Periodic Oscillations
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“Hyperchaos & Labyrinth Chaos: revisiting Thomas-Rossler systems”V. Basios , C.G. Antonopoulos, J. Theor. Biol. 460:153-159, (2019)
Chimera states 2:
Labyrinth Chaos&Hyper-chaos!
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In search of a Hamiltonian
“dot” denotes the time-derivative, X an n-dimensional vector field f a smooth function from R
n to R
n
∇H T being the transposed of the vector H∇H(X) Hamiltonian, ‘energy’ J(X) is a skew symmetric matrix
satisfying the Jacobi’s closure condition
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e.g. a Hamiltonian for the Lotka-Volterra System
Manfred Plank: “Hamiltonian structures for LV equations” J. Math. Phys. 36 (7), July 1995.
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Labyrinth Chaos Hamiltonian?
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Strategy: “Reductio ad absurdum”
Assume there is an H(x,y,z),
then prove that H(x,y,z)
is either zero or impossible!
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Mechanics’ View: Forces and Potentials
The system being conservative, the potential as the opposite of the path-integral of the force
is path-independent. … IT IS NOT
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Yet, there is a Vector Potential (for b=0) … easy
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Local Hamiltonian Structure?
There is no function H satisfying the above● Even locally, it is not possible to find such a
function.● To exhibit the local structure we are going to
replace the sinus function by its first terms of its Taylor expansion ( b = 0 ) yields
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There is a Hamiltonian iff:
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2nd Way: the Path-Integrals’ Independence
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Still … exists a Vector Potential ...
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Conclusions & Outlook
Elegant, conservative, path-dependent, non-Hamiltonian, chaos without any attractors.
Chimera-like states ability and the vector potential we shall seek not-energy driven
phase-coupling.
Related? “active information transfer” and vector potential (B. Hiley)
Related? “ABC” turbulence model(s).Other instances of similar systems?
(LLV variants?)
Its Symmetries and Symbolic Dynamics