Physics

Is there chaos in the brain by Faure P., Korn H.

By Faure P., Korn H.

Summary- within the mild of effects got over the last 20 years in a couple of laboratories, it seems that a few ot the instruments of nonlinear dynamics, tirst constructed and stronger for the actual sciences and engineering, are well-suited for stories of organic phenomena. particularly it has develop into transparent that the various regimes of actions gone through via nerve cells, neural assemblies and behavioural styles, the linkage among them, und their changes over the years, can't be totally understood within the context of even integrative body structure, with out utilizing those new concepts. This record, that is the 1st of 2 comparable papers, is geared toward introducing the non professional to the elemental facets of nonlinear dynamics, the main staggering point of that's chaos thought. After a common historical past and definition of chaos the foundations of study of time sequence in part house and the final homes of chaotic trajectories could be defined as could be the classical measures which permit a approach to be categorized as chaotic in perfect platforms ^nd types. we'll then continue to teach how those equipment must be tailored for dealing with experimental time sequence; the hazards and pitfalls confronted while facing non desk bound and infrequently noisy information should be under pressure, and particular standards for suspecting determinism in neuronal cells and/or assemblies should be defined. we are going to eventually tackle primary questions, specifically i) no matter if and the way can one distinguish, deterministic styles from stochastic ones, and, ii) what's the benefit of chaos over randomness: we'll clarify why and the way the previous should be managed while, notoriously, the latter can't be tamed. within the moment paper of the sequence, effects received on the point of unmarried cells and their membrane conductances in actual neuronal networks and within the research of upper mind services, may be significantly reviewed. will probably be proven that the instruments of nonlinear dynamics may be irreplaceable for revealing hidden mechanisms subserving, for instance, neuronal synchronization and periodic oscillations. the advantages for the mind of adopting chaotic regimes with their wide selection of capability behaviours and their flair to fast react to altering stipulations can also be thought of.

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Elements de Mécanique quantique - Tome 1

I Les origines de los angeles Th´eorie quantique
I. 1. Les innovations de l. a. body classique
(I. 1. 1) constitution corpusculaire de los angeles mati`ere
(I. 1. 2) Nature ondulatoire de los angeles lumi`ere
(I. 1. three) Le d´eterminisme de l. a. body classique
I. 2. Ondes ´electromagn´etiques et quanta de lumi`ere
I. three. los angeles nature ondulatoire de l. a. mati`ere
(I. three. 1) Les spectres de raies et les ondes de Louis de Broglie
(I. three. 2) Description quantique d’une particule libre : le paquet d’ondes
I. four. Dualit´e onde-corpuscule de l. a. lumi`ere et de l. a. mati`ere
I. five. Exercices sur les bases exp´erimentales de l. a. m´ecanique quantique
II Syst`emes quantiques simples
II. 1. Etat quantique d’une particule libre
(II. 1. 1) Fonction d’onde
(II. 1. 2) Courant de probabilit´e
(II. 1. three) Valeur moyenne et ´ecart quadratique moyen
(II. 1. four) Op´erateur “impulsion” dans l’espace des coordonn´ees
II. 2. Particule dans un potentiel ind´ependant du temps
(II. 2. 1) ideas stationnaires
(II. 2. 2) Quantification de l’´energie
II. three. los angeles barri`ere de potentiel finie : l’effet tunnel
II. four. Le puits quantique
II. five. L’oscillateur harmonique
(II. five. 1) M´ethode de r´esolution polynˆomiale
(II. five. 2) M´ethode des op´erateurs de cr´eation et de destruction
II. 6. Appendice : Fonction g´en´eratrice des polynˆomes d’Hermite et oscillateur harmonique
(II. 6. 1) Orthonormalit´e des fonctions 'n(x) de l’oscillateur harmonique
(II. 6. 2) Valeurs moyennes et probabilit´e de transition
III Fondements de los angeles th´eorie quantique
III. 1. Equation de Schr¨odinger et ses propri´et´es
(III. 1. 1) Spectre de l’op´erateur hamiltonien et element de vue du calcul vectoriel
(III. 1. 2) Le vecteur d’´etat de l’espace d’Hilbert E et ses propri´et´es
(III. 1. three) Repr´esentation des coordonn´ees |ri
(III. 1. four) Repr´esentation des impulsions |pi
(III. 1. five) formula matricielle : Repr´esentation des ´etats d’´energie
(III. 1. 6) D´eg´en´erescence d’un niveau d’´energie
III. 2. constitution de l’espace de Hilbert "H et produits tensoriels d’espaces
III. three. Le processus de mesure et sa description quantique
(III. three. 1) Commutateurs et grandeurs physiques simultan´ement mesurables
(III. three. 2) Grandeurs physiques non simultan´ement mesurables : G´en´eralisation des kin d’incertitude
de Heisenberg
III. four. L’´equation d’´evolution
III. five. Les diff´erents sch´emas en m´ecanique quantique
(III. five. 1) Le sch´ema de Schr¨odinger
(III. five. 2) Le sch´ema de Heisenberg
(III. five. three) Le sch´ema d’interaction
III. 6. L’op´erateur de densit´e
III. 7. Int´egrale premi`ere et sym´etrie
(III. 7. 1) Observables compatibles et constantes du mouvement
(III. 7. 2) Sym´etrie et constante du mouvement
(III. 7. three) G´en´erateur d’une transformation de sym´etrie
(III. 7. four) Sym´etrie de translation
III. eight. Sym´etrie par rapport aux variations de particules identiques, les “bosons” et les “fermions”
III. nine. M´ethodes d’approximation pour l. a. r´esolution de l’´equation de Schr¨odinger
(III. nine. 1) Th´eorie de perturbation
(III. nine. 2) M´ethode variationnelle lin´eaire
III. 10. Conclusions : Postulats de los angeles body quantique
III. eleven. Appendice : Le cadre math´ematique de l’espace de Hilbert "H
IV Les moments angulaires en th´eorie quantique
IV. 1. Fonctions propres et valeurs propres du second cin´etique orbital : M´ethode polynˆomiale
IV. 2. Sym´etrie de rotation et second angulaire
IV. three. M´ethode alg´ebrique : Les op´erateurs d’´echelle
IV. four. Repr´esentation matricielle des op´erateurs du second angulaire
IV. five. Le spin d’une particule
(IV. five. 1) Le second magn´etique de l’´electron
(IV. five. 2) Exp´erience de Stern et Gerlach
(IV. five. three) Vecteur d’´etat et op´erateur de spin
(IV. five. four) Pr´ecession du spin dans un champ magn´etique
(IV. five. five) Composition de deux moments angulaires
IV. 6. Appendice : Fonctions sp´eciales associ´ees au second angulaire
(IV. 6. 1) Polynˆomes de Legendre
(IV. 6. 2) Les harmoniques sph´eriques
V Particules dans un champ de strength central
V. 1. Le probl`eme de deux particules en th´eorie quantique
(V. 1. 1) Potentiel `a sym´etrie sph´erique
(V. 1. 2) Vibrations et rotations d’une mol´ecule
V. 2. L’atome hydrog´eno¨ıde
(V. 2. 1) Fonction d’onde totale et ses propri´et´es
V. three. constitution nice des atomes alcalins
(V. three. 1) Interactions spin-orbite
(V. three. 2) Corrections relativistes
V. four. Effet de Zeeman des atomes alcalins
(V. four. 1) Atome plac´e dans un champ magn´etique quelconque
(V. four. 2) Effet Zeeman anomal
(V. four. three) Effet Paschen-Back
V. five. Etats quantiques de l. a. mol´ecule diatomique
V. 6. Appendice : Propri´et´es des fonctions sp´eciales de l’atome hydrog´eno¨ıde
(V. 6. 1) Les polynˆomes de Laguerre associ´es
VI Transitions entre ´etats stationnaires
VI. 1. Mouvement d’une particule charg´ee soumise `a un champ ´electromagn´etique
(VI. 1. 1) Le hamiltonien du syst`eme
(VI. 1. 2) motion d’un champ magn´etique constant
(VI. 1. three) Invariance de jauge
VI. 2. Perturbations non stationnaires
(VI. 2. 1) R`egle d’or de Fermi
VI. three. Le rayonnement dipolaire
VI. four. Corrections multipolaires
VI. five. Expression quantique des coefficients d’Einstein
VI. 6. Coefficients d’absorption
VI. 7. R`egles de s´election et le spectre optique d’atome `a un ´electron
(VI. 7. 1) Les r`egles de s´election d’un oscillateur harmonique et d’un atome hydrog´eno¨ıde r´ealiste
VII creation `a los angeles th´eorie quantique non-relativiste des syst`emes
de particules identiques
VII. 1. Le formalisme g´en´eral
VII. 2. software `a l’atome d’h´elium
(VII. 2. 1) interplay d’´echange et magn´etisme
VII. three. L’approximation du champ self-consistant de Hartree et de Hartree-Fock
VIII creation `a l. a. th´eorie quantique de los angeles diffusion par un
potentiel
VIII. 1. part efficace de diffusion
(VIII. 1. 1) part efficace diff´erentielle dans le syst`eme du laboratoire
(VIII. 1. 2) Interpr´etation classique et loi de Rutherford
VIII. 2. Traitement stationnaire
(VIII. 2. 1) Equation int´egrale de l. a. diffusion et answer “approch´ee” : “Approximation de Born”
(VIII. 2. 2) Le r`egle d’Or de Fermi et l’approximation de Born
(VIII. 2. three) M´ethode des ondes partielles
Livres de r´ef´erence
– J. L. Basdevant, M´ecanique quantique, ellipses, 1986.
– J. Hladik, M´ecanique quantique, ´editions Masson, Paris, 1997.
Bibliographie
– D. Blokintsev, Principes de m´ecanique quantique, ´editions Mir, Moscou, 1981.
– J. M. L´evy-Leblond, F. Balibar, Quantique. Rudiments, Inter-Editions, Paris, 1984.
– Cl. Cohen-Tannoudji, B. Diu, F. Lalo¨e, M´ecanique quantique, tomes I & II, Hermann, 1980.
– E. Merzbacher, Quantum Mechanics, John Wiley, third ed. , 1998.
– S. Gasiorowicz, Quantum Physics, John Wiley, 1997.
– L. D. Landau, E. M. Lifshitz, Quantum Mechanics, Pergamon Press, third ed. , 1981.
– V. ok. Thankappan, Quantum Mechanics, John Wiley, 2d ed. , 1993.
– A. B. Wolbarst, Symmetry and Quantum Mechanics, Van Nostrand Reinhold Comp. , 1977.
– W. Louisell, Radiation and noise in Quantum Electronics, McGraw-Hill, 1964.
– A. Z. Capri, Nonrelativistic Quantum Mechanics, Benjamin/Cummings, 1985.
– J. J. Sakurai, glossy Quantum Mechanics, Benjamin/Cummings, 1985.
– W. Greiner, B. M¨uller, Quantum Mechanics, vol. I & II, Hermann, 1980.
– T. Fliessbach, Quantenmechanik, Spektrum Akademischer Verlag, 1995.
– R. W. Robinett, Quantum Mechanics, Oxford college Press, 1997.

Extra info for Is there chaos in the brain

Sample text

Willard Gibbs (about 1900) even for systems that are linear and not chaotic [Gibbs, 19021. Of course, we are most interested in the application of state space ideas to nonlinear systems; the behavior of linear systems emerges as a special case. The notion of@ed points (also called equilibrium points or stationary points or critical points or singular points) in state space plays a key role in understanding the dynamics of nonlinear systems. Much of this chapter will be spent cataloging fixed points.

Perini, 'Transition to Chaotic Behavior via a Reproducible Sequence of Period-Doubling Bifurcations," Phys. Rev. Lett. 47, 243-46 (1981). J. Testa, J. Perez, and C. Jeffries, "Eividence for Universal Chaotic Behavior of a Driven Nonlinear Oscillator," Phys. Rev. Lett. 48,714-17 (1982). F. A. Hopf, D. L. Kaplan, H. M. Gibbs, and R. L. Shoemaker, "Bifurcations to Chaos in Optical Bistability," Phys. Rev. A 25,2172-82 (1982). C. W. Smith, M. J. Tejwani, and D. A. Farris, "Bifurcation Universality for First-Sound Subharmonic Generation in Superfluid Helium-4," Phys.

W. J. Yeh and Y. H. Kao, "Universal Scaling and Chaotic Behavior of a Josephson-junction Analog," Phys. Rev. Lett. 49, 1888-91 (1982). , Modeling and Shadowing P. J. Denning, "Modeling Reality," American Scientist 78,495-98 (1990). A thoughtful discussion of modeling and its implications in science. 64 Chapter 2 he Universality of Chaos C. Grebogi, S. M. Harnmel, J. A. Yorke, and T. Sauer, "'Shadowing of Physical Trajectories in Chaotic Dynamics: Containment and Refinement," Phys. Rev. Lett. 65, 1527-30 (1990).

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