21 research outputs found
Reality, measurement and locality in Quantum Field Theory
It is currently believed that the local causality of Quantum Field Theory
(QFT) is destroyed by the measurement process. This belief is also based on the
Einstein-Podolsky-Rosen (EPR) paradox and on the so-called Bell's theorem, that
are thought to prove the existence of a mysterious, instantaneous action
between distant measurements. However, I have shown recently that the EPR
argument is removed, in an interpretation-independent way, by taking into
account the fact that the Standard Model of Particle Physics prevents the
production of entangled states with a definite number of particles. This result
is used here to argue in favor of a statistical interpretation of QFT and to
show that it allows for a full reconciliation with locality and causality.
Within such an interpretation, as Ballentine and Jarret pointed out long ago,
Bell's theorem does not demonstrate any nonlocality.Comment: 15 pages. Published versio
On the linear forms of the Schrodinger equation
Generalizing the linearisation procedure used by Dirac and later by
L\'evy-Leblond, we derive the first-order non-relativistic wave equations for
particles of spin 1 and spin 3/2 starting from the Schrodinger equation
A spatially-VSL gravity model with 1-PN limit of GRT
A scalar gravity model is developed according the 'geometric conventionalist'
approach introduced by Poincare (Einstein 1921, Poincare 1905, Reichenbach
1957, Gruenbaum1973). In principle this approach allows an alternative
interpretation and formulation of General Relativity Theory (GRT), with
distinct i) physical congruence standard, and ii) gravitation dynamics
according Hamilton-Lagrange mechanics, while iii) retaining empirical
indistinguishability with GRT. In this scalar model the congruence standards
have been expressed as gravitationally modified Lorentz Transformations
(Broekaert 2002). The first type of these transformations relate quantities
observed by gravitationally 'affected' (natural geometry) and 'unaffected'
(coordinate geometry) observers and explicitly reveal a spatially variable
speed of light (VSL). The second type shunts the unaffected perspective and
relates affected observers, recovering i) the invariance of the locally
observed velocity of light, and ii) the local Minkowski metric (Broekaert
2003). In the case of a static gravitation field the model retrieves the
phenomenology implied by the Schwarzschild metric. The case with proper source
kinematics is now described by introduction of a 'sweep velocity' field w: The
model then provides a hamiltonian description for particles and photons in full
accordance with the first Post-Newtonian approximation of GRT (Weinberg 1972,
Will 1993).Comment: v1: 11 pages, GR17 conf. paper, Dublin 2004, v2: WEP issue solved,
section on acceleration transformation added, text improved, more references,
same results, v3: typos removed, footnotes, added and references updated, v4:
appendix added, improved tex
Detection model based on representation of quantum particles by classical random fields: Born's rule and beyond
Recently a new attempt to go beyond quantum mechanics (QM) was presented in
the form of so called prequantum classical statistical field theory (PCSFT).
Its main experimental prediction is violation of Born's rule which provides
only an approximative description of real probabilities. We expect that it will
be possible to design numerous experiments demonstrating violation of Born's
rule. Moreover, recently the first experimental evidence of violation was found
in the triple slits interference experiment, see \cite{WWW}. Although this
experimental test was motivated by another prequantum model, it can be
definitely considered as at least preliminary confirmation of the main
prediction of PCSFT. In our approach quantum particles are just symbolic
representations of "prequantum random fields," e.g., "electron-field" or
"neutron-field"; photon is associated with classical random electromagnetic
field. Such prequantum fields fluctuate on time and space scales which are
essentially finer than scales of QM, cf. `t Hooft's attempt to go beyond QM
\cite{H1}--\cite{TH2}. In this paper we elaborate a detection model in the
PCSFT-framework. In this model classical random fields (corresponding to
"quantum particles") interact with detectors inducing probabilities which match
with Born's rule only approximately. Thus QM arises from PCSFT as an
approximative theory. New tests of violation of Born's rule are proposed.Comment: Relation with recent experiment on violation of Born's rule in the
triple slit experiment is discussed; new experimental test which might
confirm violation of Born's rule are presented (double stochsticity test and
interference magnitude test); the problem of "double clicks" is discusse