A SQUID No-Go theorem without macrorealism: What SQUID's really tell us about natureFoster, Sara; Elby, Andrew
doi: 10.1007/BF00733344pmid: N/A
Without invoking macrorealism, we derive a contradiction between the quantum mechanical predictions forsquid's and two intuitive conditions. First, we assume that asquid can be measured without significantly disturbing its subsequent macroscopic behavior. Second, we assume a trivial realism condition much weaker than Leggett's macrorealism. Quantum mechanics itself obeys our realism assumption. This proof suggests that althoughsquid experiments cannot rule out macrorealism, they can rule out most theories that allow noninvasive measurements.
Symmetries and asymmetries in classical and relativistic electrodynamicsBartocci, Umberto; Capria, Marco
doi: 10.1007/BF00733345pmid: N/A
By a comparison between Maxwell's electrodynamics classically interpreted (MT) and relativistic electrodynamics (RED), this paper discusses whether the “asymmetries” in MT mentioned by A. Einstein in his 1905 relativity paper are only of a conceptual nature or rather involve specific empirical claims. It is shown that in fact MT predicts strongly asymmetric behaviour for very simple interactions, and an analysis is made of the extent of the “symmetry” achieved by means of relativistic postulates. A “low” velocity experiment is suggested which could provide another test of the accuracy of RED with respect to MT.
Interpretation of the curious results of the new quantum formalism of pre- and post-selected systemsZachar, Oron; Alter, Orly
doi: 10.1007/BF00733346pmid: N/A
The analysis, with the use of two state vectors, of a quantum system, during the time interval between two measurements, leads to some amazing results, which seem to contradict our usual “quantum common sense.” We explore the questions of compatibility with the conventional quantum theory, uniqueness of pre- and post-selected ensembles, commutativity, simultaneity and reality of strong and weak values in the intermediate time, and the meaning of the weak value. Common criticisms are shown to be unfounded.
What determines whether a wave function is inherently necessary?Dotson, Allen
doi: 10.1007/BF00733347pmid: N/A
The inherent necessity of wave functions may be determined in either of two ways. One way, frequently presupposed, states that the fundamental validity of wave functions is determined generically: The nature of the system determines the assignability of inherently necessary wave functions. The other approach holds that it is the specific experiment which determines the systems for which description by use of wave functions is fundamentally valid. A guideline based on this contextual approach is proposed and tested in three experimental situations.
An analytical solution of the stochastic Navier-Stokes systemAdomian, G.
doi: 10.1007/BF00733348pmid: N/A
This paper, using the author's decomposition method and recent generalizations, presents algorithms for an analytic solution of the stochastic Navier-Stokes system without linearization, perturbation, discretization, or restrictive assumptions on the nature of stochasticity. The pressure, forces, velocities, and initial/boundary conditions can be stochastic processes and are not limited to white noise. Solutions obtained are physically realistic because of the avoidance of assumptions made purely for mathematical tractability by usual methods. Certain extensions and further generalizations of the decomposition method have provided the basis for the solution.