Chaos: Classical and Quantum - published projects

	Vakhtang Putkaradze A method for finding periodic orbits (course term paper, 29 apr 1996) [ ps.gz ] Fig 1 , Fig 2 , Fig 3 , Fig 4 numerical routines for finding periodic orbits, zeros of Fredholms, data files... periodic orbits data, used in the article for finding periodic orbits, zeros of Fredholms, data files...
	Local Structures in Extended Systems (PhD thesis 1997). [ HTML ]
	Vachtang decided to apply the ChaosBook technology to his Ph D research with his adviser T. Bohr: spatiotemporal chaos in Kuramoto-Sivashinsky system. Joining forces with F. Chrisitansen, this course project not only became a part of Vachtang's thesis and lead to a publication, but was also a seed to the still ongoing research program in turbulence.
	publication:
	Predrag Cvitanović, F. Christiansen and V. Putkaradze Hopf's last hope: spatiotemporal chaos in terms of unstable recurrent patterns Nonlinearity 10, 50 (1997) [ ps.gz ]
	Marc W. Slutzky Extraction of unstable periodic orbits from noisy data (19 oct 1998) [ ps.gz ]
	Marc wove cycles into a very broad-front attack on epylepsy; with his adviser D.J. Mogul he prepared rat hipocampal preparations, kept them alive, poked them with electrods, collected and analyzed numerically the neurnal interburst intervals, and with P. Cvitanovic he developed now methods for describing instability in systems where noise is comparable with the putative nonlinear dynamics, and measures like Lyapunov exponents make no sense.This project became a major part of Mark's thesis and lead to a series of publications, and is still an ongoing research program.
	publications:
	Marc W. Slutzky, Predrag Cvitanović and David J. Mogul Deterministic chaos and noise in three in vitro hippocampal models of epilepsy Annals of Biomedical Engineering 29, 607 (2001).
	Marc W. Slutzky, Predrag Cvitanović and David J. Mogul Manipulating epileptiform bursting in the rat hippocampus using chaos control and adaptive techniques IEEE Transactions on Biomedical Engineering 50, 559 (2001).
	Marc W. Slutzky, Predrag Cvitanović and David J. Mogul Identification of determinism in noisy neuronal systems J. Neuroscience Methods 118, 153 (2002)
	Kim Hansen, Juri Rolf Sum rules Kim Hansen's Copenhangen University 3rd year physics undergraduate project, in danish, (10 May 1995) [ ps.gz ] Infintely many sum rules Kim Hansen addition, (14 July 95) [ ps.gz ]
	Kim's undergraduate term project was to read a draft of a Cvitanovic - Vattay paper and understand it. His interpretation was so original that reading it P. Cvitanovic saw it lead not only to the sum rules already in the paper, but an infinity of new sum rules over periodic orbits. He sent Kim back to write an addendum, and incorporated Kim's ideas into the final version of the paper. Kim decided to become an experimentalist.
	Comparison between cycle expansion and adjoint equations Juri Rolf (11 feb 1997) [ ps.gz ]
	Rereading the same draft of a Cvitanovic - Vattay paper, in this project J. Rolf proposed new conjectures for an infinite family of nontrivial spectral determinants, also incorporeted into the final publication
	publication:
	Predrag Cvitanović, Kim Hansen, Juri Rolf and Gabor Vattay Beyond periodic orbit theory Nonlinearity 11, 1209 (1998) [ ps.gz ]
	Gabor Simon Chaotic Radial Oscillations of a Harmonically Forced Gas Bubble, Parametric Dependence and Consequences for Sonoluminescence (2 feb 2000) [ ps.gz ]
	After reading the theoretical papers related to the sonoluminescence experiment that he was carrying out with his adviser M.T. Levinsen, Gabor applied the periodic theory to a calculation of the mean light intensity emited by a chaotic sonoluminescent bubble. This is probably still one of the cutest applications of the periodic theory to a physical experiment (other than applications to quantum systems).
	publication:
	G. Simon, Predrag Cvitanović, M.T. Levinsen, I. Csabai and Á. Horváth Periodic orbit theory applied to a chaotically oscillating gas bubble in water Nonlinearity 15, 25 (2002)
	Sune F. Nielsen 4-disk resonances (20 Jan 1997) [ ps.gz ]
	The skills developed in executing this project made it possible to test Per Dahlqvist's ideas.
	publication:
	Sune F. Nielsen, Per Dahlqvist and Predrag Cvitanović Periodic orbit sum rules for billiards: Accelerating cycle expansions J. Phys. A 32, 6757 (1999) [ ps.gz , chao-dyn/9901001 , working notes ]