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Sökning: WFRF:(Giorgini Ludovico Theo) > (2022)

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1.
  • Giorgini, Ludovico Theo, et al. (författare)
  • Correlation functions of the anharmonic oscillator : Numerical verification of two-loop corrections to the large-order behavior
  • 2022
  • Ingår i: Physical Review D. - : American Physical Society (APS). - 2470-0010 .- 2470-0029. ; 105:10
  • Tidskriftsartikel (refereegranskat)abstract
    • Recently, the large-order behavior of correlation functions of the O(N)-anharmonic oscillator has been analyzed by us [L. T. Giorgini et al., Phys. Rev. D 101, 125001 (2020)]. Two-loop corrections about the instanton configurations were obtained for the partition function, the two-point and four-point functions, and the derivative of the two-point function at zero momentum transfer. Here, we attempt to verify the obtained analytic results against numerical calculations of higher-order coefficients for the O(1), O(2), and O(3) oscillators, and we demonstrate the drastic improvement of the agreement of the large-order asymptotic estimates and perturbation theory upon the inclusion of the two-loop corrections to the large-order behavior.
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2.
  • Giorgini, Ludovico Theo, et al. (författare)
  • Non-Gaussian stochastic dynamical model for the El Niño southern oscillation
  • 2022
  • Ingår i: Physical Review Research. - : American Physical Society (APS). - 2643-1564. ; 4:2
  • Tidskriftsartikel (refereegranskat)abstract
    • A nonautonomous stochastic dynamical model approach is developed to describe the seasonal to interannual variability of the El Niño southern oscillation (ENSO). We determine the model coefficients by systematic statistical estimations using partial observations involving only sea surface temperature data. Our approach reproduces the observed seasonal phase locking and its uncertainty, as well as the highly non-Gaussian statistics of ENSO. Finally, we recover the intermittent time series of the hidden processes, including the thermocline depth and the wind bursts.
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