نتایج جستجو برای: covariance operators

تعداد نتایج: 126652  

2008
José Antonio Belinchón

The behavior of the ”constants”, G, c, h̄, a, e, mi and Λ, considering them as variable, in the framework of a flat cosmological model with FRW symmetries described by a bulk viscous fluid and considering mechanisms of adiabatic matter creation are investigated. Within two models; one with radiation predominance and another of matter predominance, this behavior are studied. We find that with the...

2003
P. V. Gehler M. O. Franz

Classical Volterra and Wiener theory of nonlinear systems does not address the problem of noisy measurements in system identification. This issue is treated in the present part of the report. We first show how to incorporate the implicit estimation technique for Volterra and Wiener series described in Part I into the framework of regularised estimation without giving up the orthogonality proper...

Journal: :Journal of Statistical Mechanics: Theory and Experiment 2022

The dynamics of Markovian open quantum systems are described by Lindblad master equations. For fermionic and bosonic that quasi-free, i.e., with Hamiltonians quadratic in the ladder operators linear operators, we derive equation motion for covariance matrix. This determines evolution Gaussian initial states steady states, which also Gaussian. Using super-operators (a.k.a. third quantization), s...

2008
S. B. Leble

Polynomials in differentiation operators are considered. The Darboux transformations covariance determines non-Abelian entries to form the coefficients of the polynomials. Joint covariance of a pair of such polynomials (Lax pair) as a function of one-field is studied. Methodically, the transforms of the coefficients are equalized to Frechet derivatives (first term of the Taylor series on prolon...

2005
Arthur Gretton Olivier Bousquet Alexander J. Smola Bernhard Schölkopf

We propose an independence criterion based on the eigenspectrum of covariance operators in reproducing kernel Hilbert spaces (RKHSs), consisting of an empirical estimate of the Hilbert-Schmidt norm of the cross-covariance operator (we term this a Hilbert-Schmidt Independence Criterion, or HSIC). This approach has several advantages, compared with previous kernel-based independence criteria. Fir...

2010
Victor M. PANARETOS David KRAUS John H. MADDOCKS

Given two samples of continuous zero-mean iid Gaussian processes on [0,1], we consider the problem of testing whether they share the same covariance structure. Our study is motivated by the problem of determining whether the mechanical properties of short strands of DNA are significantly affected by their base-pair sequence; though expected to be true, had so far not been observed in three-dime...

2008
Bogdan Cristea

Mean value and cross-covariance function of chaotic binary sequences are evaluated for chaotic maps with specific properties. We also take into account the effect of fixedand floating-point representations on statistical properties of chaotic generators. Thus, one is able to obtain possible candidates for pseudo-random binary sequences generation. Results of statistical tests applied to chaotic...

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