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On semi-Classical Questions Related to Signal Analysis [article]

Taous-Meriem Laleg-Kirati, Bernard Helffer
2010 arXiv   pre-print
Theoretical results in semi-classical analysis are proved. Some numerical results are also presented. We first consider as a toy model the sech^2 function.  ...  Then we study a real signal given by arterial blood pressure measurements. This approach seems to be very promising in signal analysis.  ...  Acknowledgements: The authors would like to thank G.  ... 
arXiv:1009.5372v2 fatcat:ywa5dp77kbhppo3byrwxdmxnri

A Semi-Classical Signal Analysis Method For The Analysis Of Turbomachinery Flow Unsteadiness

Fadi Eleiwi, Taous Meriem Laleg-Kirati, Sofiane Khelladi, Farid Bakir
2011 Zenodo  
We will focus on the correlation between theSemi-Classical Signal Analysis parameters and some physical parameters in relation with turbomachinery features.  ...  This paper presents the use of a semi-classical signal analysis method that has been developed recently for the analysis of turbomachinery flow unsteadiness.  ...  A SEMI-CLASSICAL SIGNAL ANALYSIS METHOD A.  ... 
doi:10.5281/zenodo.1075514 fatcat:zjvm7mw3mzfbtffxevvltvkdxe

Introduction: Agrarian Questions and Left Politics in India

Jens Lerche, Alpa Shah, Barbara Harriss-White
2013 Journal of Agrarian Change  
On the basis of the papers of this special issue, the introduction outlines the development of capitalism in the Indian countryside, its relation to the development of capitalism in India and to neoliberal  ...  It raises the question of how rural class relations have developed in different parts of the country and discusses the extent to which Indian Left politics has analysed and strategized such development  ...  Finding a deep disjuncture between the Maoist party's analysis of semi-feudalism and agrarian change in the hills and forests of Jharkhand, Shah's paper signals the need for regionally specific analyses  ... 
doi:10.1111/joac.12031 fatcat:vuis6fytbjekbcoceiu3nqcnoq

Partial Observations, Einstein Locality and Bell Inequalities in Quantized Detector Networks [article]

G. Jaroszkiewicz
2008 arXiv   pre-print
Partial observations in QDN involve subsets of the elementary signal detectors which constitute an apparatus.  ...  We use them to prove that QDN is consistent with Einstein locality and violations of Bell-type inequalities.  ...  We refer to the above as quadratic relations, as they involve products of two signal operators.  ... 
arXiv:0803.1240v1 fatcat:vqp65vqbtzekfjnxiyorvswvwq

Semi-classical signal analysis [article]

Taous-Meriem Laleg-Kirati, Emmanuelle Crépeau
2010 arXiv   pre-print
This study introduces a new signal analysis method called SCSA, based on a semi-classical approach.  ...  The main idea in the SCSA is to interpret a pulse-shaped signal as a potential of a Schr\"odinger operator and then to use the discrete spectrum of this operator for the analysis of the signal.  ...  Our method is based on semi-classical concepts i.e h → 0 and we will call it Semi-Classical Signal Analysis (SCSA). In the next section, we will present some properties of the SCSA.  ... 
arXiv:1007.0938v1 fatcat:cv3lr4f3lbbglgxqcdony6jjqi

The Schrödinger–Newton equation and its foundations

Mohammad Bahrami, André Großardt, Sandro Donadi, Angelo Bassi
2014 New Journal of Physics  
Together with the standard collapse postulate, fundamentally semi-classical gravity gives rise to superluminal signalling.  ...  In this paper we compare the approach of quantum gravity, with that of a fundamentally semi-classical theory of gravity, in the weak-field non-relativistic limit.  ...  If one wants to attribute the collapse to gravity, the gravitational interaction has to account for random effects, either instead of or on top of the semi-classical theory. experiment is based on the  ... 
doi:10.1088/1367-2630/16/11/115007 fatcat:wfq2oyj25rdjvhl3y66vxvmxfu

Stability and instability of scalar fields coupled to gravity

Q-Han Park, L.F. Abbott
1986 Physics Letters B  
We relate the stability criteria of Boucher for a scalar field coupled to gravity to the semi-classical tunnelling calculations of Coleman and DeLuccia.  ...  In addition, it provides physical insight into the nature of the Boucher conditions and indicates that the O(4)-invariant, thin-wall approximation used in semi-classical tunnelling computations is reliable  ...  Semi-classical instability is signalled by the presence of a solution to the euclidean field equations satisfying "bounce" boundary conditions and having finite euclidean action [2] .  ... 
doi:10.1016/0370-2693(86)91536-4 fatcat:63z5sapsbferlkc6x7npfdvndm

Semi-classical signal analysis

Taous-Meriem Laleg-Kirati, Emmanuelle Crépeau, Michel Sorine
2012 MCSS. Mathematics of Control, Signals and Systems  
This study introduces a new signal analysis method called SCSA, based on a semi-classical approach.  ...  The main idea in the SCSA is to interpret a pulse-shaped signal as a potential of a Schrödinger operator and then to use the discrete spectrum of this operator for the analysis of the signal.  ...  Our method is based on semi-classical concepts i.e h → 0 and we will call it Semi-Classical Signal Analysis (SCSA). In the next section, we will present some properties of the SCSA.  ... 
doi:10.1007/s00498-012-0091-1 fatcat:by5mzhoz45fa7pyb7gdwuakghe

On the Stability of Gabor Phase Retrieval

Matthias Claus Wellershoff, Rima Alaifari
2019 Proceedings of the ICA congress  
However, it has also been shown that one can relax the classical stability regime to so-called semi-global phase reconstruction and obtain a stability result for phase retrieval from the continuous Gabor  ...  Phase retrieval refers to the problem of recovering a signal from phaseless measurements.  ...  This insight led the authors of (25) to suggest that one should try to reconstruct signals up to semi-global phase and not up to global phase as was common in the literature up to then.  ... 
doi:10.18154/rwth-conv-238869 fatcat:ksqkpjg4kfeszbmcymbdsr5lke

From Exact Results to Gauge Dynamics on R^3× S^1 [article]

Arash Arabi Ardehali, Luca Cassia, Yongchao Lü
2020 arXiv   pre-print
Guided by the Cardy-like asymptotics of its Romelsberger index, and building on earlier semi-classical results by Poppitz and Ünsal, we argue that previously overlooked non-perturbative effects generate  ...  a Higgs-type potential on the classical Coulomb branch of the low-energy effective 3d N=2 theory.  ...  Shaghoulian for related discussions, as well as to two anonymous JHEP referees whose feedback on an earlier draft of this manuscript was essential to its subsequent improvement.  ... 
arXiv:1912.02732v3 fatcat:hv7fe2szqfhejkma6dj3liepxi

The collapse of a quantum state as a joint probability construction [article]

Peter Morgan
2022 arXiv   pre-print
The no-collapse picture is particularly simpler when we apply signal analysis to millions or billions of consecutive measurements.  ...  non-commutative, non-associative collapse product that is nonlinear in its left operand as a model for joint measurements at timelike separation, in part inspired by the sequential product for positive semi-definite  ...  Conditions satisfied by a state We take a complex-valued state ρ acting on a * -algebra A, ρ : A → C; → ρ(Â), to satisfy four conditions [ • von Neumann complex-linearity: ρ(λ + µB) = λρ(Â) + µρ(B),  ... 
arXiv:2101.10931v3 fatcat:p3ttnhsbzvdpjcpteyjir7nfs4

Signal analysis and quantum formalism: Quantizations with no Planck constant [article]

Jean Pierre Gazeau, Celestin Habonimana
2020 arXiv   pre-print
Signal analysis is built upon various resolutions of the identity in signal vector spaces, e.g. Fourier, Gabor, wavelets, etc.  ...  Extensions to classical electromagnetism viewed as a quantum theory for waves and not for photons are mentioned.  ...  on L 2 (R, dt) So, the question is how to manage time-frequency functions f (t, ω)?  ... 
arXiv:2001.04916v1 fatcat:nilcexdezzeuff63d7cov62mb4

Looking at Graviton Properties, as Either Classical or QM, in Nature, via Alicki-Van Ryn Experimental Realization

Andrew Beckwith
2012 Open Journal of Microphysics  
While the technology currently does not exist to perform such an analysis yet, the same sort of thought experiment is proposed in a way to allow for a first principle test of the either classical or quantum  ...  Recently, the author read the Alicki-Van Ryn test as to behavior of photons in a test of violations of classicality.  ...  for certain configurations for semi classical characteristics of a graviton.  ... 
doi:10.4236/ojm.2012.24007 fatcat:iadk6ytdrfhyjnd7va3r4zreje

From exact results to gauge dynamics on ℝ3 × S1

Arash Arabi Ardehali, Luca Cassia, Yongchao Lü
2020 Journal of High Energy Physics  
Guided by the Cardy-like asymptotics of its Romelsberger index, and building on earlier semi-classical results by Poppitz andÜnsal, we argue that previously overlooked non-perturbative effects generate  ...  a Higgs-type potential on the classical Coulomb branch of the low-energy effective 3d N = 2 theory.  ...  Shaghoulian for related discussions, as well as to two anonymous JHEP referees whose feedback on an earlier draft of this manuscript was  ... 
doi:10.1007/jhep08(2020)053 fatcat:hdl5hxsxsffx5pkyphecjtflry

Particle decay processes, the quantum Zeno effect and the continuity of time [article]

George Jaroszkiewicz, Jon Eakins
2006 arXiv   pre-print
Signal-state quantum mechanics is used to discuss quantum mechanical particle decay probabilities and the quantum Zeno effect.  ...  The formalism is applied to single channel decays, the ammonium molecule, and neutral Kaon decay processes.  ...  Acknowledgements GJ is grateful to Andrei Khrennikov for an invitation to the Foundations of Probability and Physics-4 Conference in Växjö, Sweden (2006) which stimulated this line of work, and to Ariel  ... 
arXiv:quant-ph/0608248v2 fatcat:duqh624hdbghlkm4jcyadoxqeu
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