Chaos and 1/f noise in nuclear spectra Topics in Nuclear Structure: Proceedings of the 8th International Spring Seminar on Nuclear Physics Paestum, Italy, 23 – 27 May 2004
dc.contributor.authorGómez, J. M. G.
dc.contributor.authorFaleiro, E.
dc.contributor.authorMolina, R. A.
dc.contributor.authorMuñoz, L.
dc.contributor.authorRelaño Pérez, Armando
dc.contributor.editorCovello, Aldo
dc.description© 2005 World Scientific Publishing Company. International Spring Seminar on Nuclear Physics (8º. 2004. Paestum (Italia). This work is supported in part by Spanish Government grants BFM2003-04147-C02 and FTN2003-08337-C04-04.
dc.description.abstractMany complex systems in nature and in human society exhibit time fluctuations characterized by a power spectrum S(f) which is a power function of the frequency f . Examples with this behavior are the Sun spot activity, the human heartbeat, the DNA sequence, or Bach’s First Brandenburg Concert. In this work, we show that the energy spectrum fluctuations of quantum systems can be formally considered as a discrete time series, with energy playing the role of time. Because of this analogy, the fluctuations of quantum energy spectra can be studied using traditional methods of time series, like calculating the Fourier transform and studying the power spectrum. We present the results for paradigmatic quantum chaotic systems like atomic nuclei (by means of large scale shell-model calculations) and the predictions of random matrix theory. We have found a surprising general property of quantum systems: The energy spectra of chaotic quantum systems are characterized by 1= f noise, while regular quantum systems exhibit 1= f^2 noise. Some other interesting applications of this time series analogy are a test of the existence of quantum chaos remnants in the nuclear masses, and the study of the order to chaos transition in semiclassical systems. In this case, it is found that the energy level spectrum exhibits 1= f^α noise with the exponent changing smoothly from α = 2 in regular systems to α= 1 in chaotic systems.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.sponsorshipGobierno de España
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dc.publisherWorld Scientific Publishing Company
dc.rights.accessRightsopen access
dc.subject.keywordQuantum chaos
dc.subject.keywordTime series
dc.subject.ucmFísica (Física)
dc.subject.unesco22 Física
dc.titleChaos and 1/f noise in nuclear spectra
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