Zobrazeno 1 - 10
of 136
pro vyhledávání: '"Retamosa, J. A."'
Publikováno v:
Physics Letters B 710, 139-144 (2012)
We present a robust analysis of the spectral fluctuations exhibited by the light meson spectrum. This analysis provides information about the degree of chaos in light mesons and may be useful to get some insight on the underlying interactions. Our an
Externí odkaz:
http://arxiv.org/abs/1203.1472
Using the ergodicity principle for the expectation values of several types of observables, we investigate the thermalization process in isolated fermionic systems. These are described by the two-body random ensemble, which is a paradigmatic model to
Externí odkaz:
http://arxiv.org/abs/1102.0528
It was recently conjectured that 1/f noise is a fundamental characteristic of spectral fluctuations in chaotic quantum systems. In this Letter we show that the level fluctuations of experimental realizations of the Sinai billiard exhibit {\em 1/f} no
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502192
Autor:
Gomez, J. M. G., Relano, A., Retamosa, J., Faleiro, E., Salasnich, L., Vranicar, M., Robnik, M.
Publikováno v:
Phys. Rev. Lett. 94, 084101 (2005)
The power law $1/f^{\alpha}$ in the power spectrum characterizes the fluctuating observables of many complex natural systems. Considering the energy levels of a quantum system as a discrete time series where the energy plays the role of time, the lev
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502130
Publikováno v:
Phys.Rev.E70:017201,2004
We show that the spectral fluctuations of the Two-Body Random Ensemble (TBRE) exhibit 1/f noise. This result supports a recent conjecture stating that chaotic quantum systems are characterized by 1/f noise in their energy level fluctuations. After su
Externí odkaz:
http://arxiv.org/abs/nlin/0405013
Publikováno v:
Phys.Rev.Lett.93:244101,2004
It was recently conjectured that 1/f noise is a fundamental characteristic of spectral fluctuations in chaotic quantum systems. This conjecture is based on the behavior of the power spectrum of the excitation energy fluctuations, which is different f
Externí odkaz:
http://arxiv.org/abs/nlin/0402028
Using a new class of exactly solvable models based on the pairing interaction, we show that it is possible to construct integrable Hamiltonians with a Wigner distribution of nearest neighbor level spacings. However, these Hamiltonians involve many-bo
Externí odkaz:
http://arxiv.org/abs/nlin/0402011
The main signature of chaos in a quantum system is provided by spectral statistical analysis of the nearest neighbor spacing distribution and the spectral rigidity given by $\Delta_3(L)$. It is shown that some standard unfolding procedures, like loca
Externí odkaz:
http://arxiv.org/abs/nlin/0112014
Publikováno v:
In ``Contemporary Nuclear Physics'', edited by C.R. Praharaj (Narosa Publishing House, New Delhi, India, 2003), p. 277-289.
For the embedded Gaussian orthogonal ensemble (EGOE) of random matrices, the strength sums generated by a transition operator acting on an eigenstate vary with the excitation energy as the ratio of two Gaussians. This general result is compared to ex
Externí odkaz:
http://arxiv.org/abs/nucl-th/0005066
Publikováno v:
Phys.Rev. C59 (1999) 2033-2039
Binding energies and other global properties of nuclei in the middle of the $pf$ shell, such as M1, E2 and Gamow-Teller sum rules, have been obtained using a new Shell Model code (NATHAN) written in quasi-spin formalism and using a $j-j$-coupled basi
Externí odkaz:
http://arxiv.org/abs/nucl-th/9809068