Classical analogue of an interstellar travel through a hydrodynamic wormhole

2017 ◽  
Vol 96 (6) ◽  
Author(s):  
L.-P. Euvé ◽  
G. Rousseaux
Keyword(s):  
Classical Analogue

scholarly journals Quantum Calculations on Ion Channels: Why Are They More Useful Than Classical Calculations, and for Which Processes Are They Essential?

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 655
Author(s):  
Alisher M. Kariev ◽  
Michael E. Green
Keyword(s):  
Charge Transfer ◽  
Ion Channels ◽  
Correlation Energy ◽  
Force Fields ◽  
Critical Role ◽  
Atomic Scale ◽  
Quantum Calculations ◽  
Interatomic Distances ◽  
Classical Analogue ◽  
Exchange And Correlation

There are reasons to consider quantum calculations to be necessary for ion channels, for two types of reasons. The calculations must account for charge transfer, and the possible switching of hydrogen bonds, which are very difficult with classical force fields. Without understanding charge transfer and hydrogen bonding in detail, the channel cannot be understood. Thus, although classical approximations to the correct force fields are possible, they are unable to reproduce at least some details of the behavior of a system that has atomic scale. However, there is a second class of effects that is essentially quantum mechanical. There are two types of such phenomena: exchange and correlation energies, which have no classical analogues, and tunneling. Tunneling, an intrinsically quantum phenomenon, may well play a critical role in initiating a proton cascade critical to gating. As there is no classical analogue of tunneling, this cannot be approximated classically. Finally, there are energy terms, exchange and correlation energy, whose values can be approximated classically, but these approximations must be subsumed within classical terms, and as a result, will not have the correct dependence on interatomic distances. Charge transfer, and tunneling, require quantum calculations for ion channels. Some results of quantum calculations are shown.

scholarly journals Classical Analogue of Electromagnetically Induced Transparency with a Metal-Superconductor Hybrid Metamaterial

2011 ◽  
Vol 107 (4) ◽  
Author(s):  
Cihan Kurter ◽  
Philippe Tassin ◽  
Lei Zhang ◽  
Thomas Koschny ◽  
Alexander P. Zhuravel ◽  
...  
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Classical Analogue ◽  
Induced Transparency ◽  
Hybrid Metamaterial

Adiabatic second-order energy derivatives in quantum mechanics

1958 ◽  
Vol 54 (2) ◽  
pp. 251-257 ◽  
Author(s):  
W. Byers Brown ◽  
H. C. Longuet Higgins
Keyword(s):  
Quantum Mechanics ◽  
General Equation ◽  
Canonical Ensemble ◽  
Second Order ◽  
Order Derivative ◽  
Interacting Particles ◽  
Energy Derivatives ◽  
Order Energy ◽  
Classical Analogue ◽  
Image Position

ABSTRACTThe general equation for the adiabatic second-order derivative of the energy En of an eigenstate with respect to parameters λ and λ′ occurring in the Hamiltonian ℋ isThe applications of this equation to molecules (λ, λ′ = nuclear position coordinates) and to enclosed assemblies of interacting particles (λ = λ′ = volume) are discussed, and the classical analogue of the equation for a micro-canonical ensemble is derived.

Generalized classical dynamics, and the ‘classical analogue’ of a Fermioscillator

1959 ◽  
Vol 251 (1267) ◽  
pp. 536-542 ◽  
Keyword(s):  
Hamiltonian Dynamics ◽  
Lagrangian Formulation ◽  
Classical Dynamics ◽  
Classical Analogue

Various ways of generalizing classical canonical dynamics are considered. It is found that there exist systems of c-number Hamiltonian dynamics possessing neither canonically conjugate dynamical variables nor Lagrangian formulation. The possibility of a non c-number classical dynamics is then considered and realized. Elementary examples of both types of dynamics are examined, and emerge as classical analogues of a Fermioscillator. This is remarkable in view of the commonly held belief that a Fermi oscillator does not have a classical analogue. Not all possible classical analogues possess a Lagrangian formulation: those which do are of particular interest, since they provide the means of setting up a kind of Feynman principle.

scholarly journals Observation of negative-frequency waves in a water tank: a classical analogue to the Hawking effect?

2008 ◽  
Vol 10 (5) ◽  
pp. 053015 ◽  
Author(s):  
Germain Rousseaux ◽  
Christian Mathis ◽  
Philippe Maïssa ◽  
Thomas G Philbin ◽  
Ulf Leonhardt
Keyword(s):  
Water Tank ◽  
Hawking Effect ◽  
Classical Analogue

SELF-SIMILARITY OF FREE STOCHASTIC PROCESSES

2006 ◽  
Vol 09 (03) ◽  
pp. 451-469 ◽  
Author(s):  
ZHAOZHI FAN
Keyword(s):  
Stochastic Processes ◽  
Self Similarity ◽  
Strict Stability ◽  
Classical Analogue ◽  
Self Similar

In this paper we study self-similarity of free stochastic processes. We establish the noncommutative counterpart of Lamperti's self-similar processes. We develop the characterization of noncommutative self-similar processes through a modification of Voiculescu transform, the free cumulant transform. We study the connection between free self-similarity, strict ⊞-stability and ⊞-self-decomposability. In particular, we derive the properties of free self-similar processes and their connection to strict ⊞-stability and ⊞-self-decomposability, that turn out to be consistent with their classical analogue.

ON THE POSSIBLE EXISTENCE OF A DERIVATIVE COUPLING IN QUANTUM ELECTRODYNAMICS

1959 ◽  
Vol 37 (12) ◽  
pp. 1339-1343
Author(s):  
F. A. Kaempffer
Keyword(s):  
Cross Section ◽  
Quantum Electrodynamics ◽  
Mass Difference ◽  
Large Mass ◽  
The Self ◽  
Nucleon Mass ◽  
Muon Scattering ◽  
Derivative Coupling ◽  
Self Energy ◽  
Classical Analogue

Within the framework of quantum electrodynamics there exists the possibility of a derivative coupling between source and photon field, referred to as eΛ-charge, which has no classical analogue. For calculations the usual graph technique can be used, provided the factor eγμ contributed by each vertex in a conventional graph is replaced by ieΛkμ, where Λ is a length characteristic of the new interaction. Using as cutoff the nucleon mass M one finds for a bare source of electronic mass m the self-energy in second order to be Λm/m ≈ 200, if Λ−1 ≈ 60 M. It is argued that the large mass difference between muon and electron may be due to this effect, assuming muon and electron to differ only in that the muon has eΛ-charge whereas the electron has not. An estimate is made of the muon–muon scattering cross section caused by the presence of eΛ-charge on the muon, and it is found that the existence of this derivative coupling may have escaped observation.

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