148 research outputs found
Gravity-related spontaneous collapse in bulk matter
In the DP-model, gravity-related spontaneous wave function collapses suppress
undesirable Schr\"odinger Cat states. We derive the equations of the model for
the hydrodynamic-elastic (acoustic) modes in a bulk. Two particular features
are discussed: the universal dominance of spontaneous collapses at large
wavelengths, and the reduction of spontaneous heating by a slight refinement of
the DP-model.Comment: 6p
Unique Quantum Paths by Continuous Diagonalization of the Density Operator
In this short note we show that for a Markovian open quantum system it is
always possible to construct a unique set of perfectly consistent Schmidt
paths, supporting quasi-classicality. Our Schmidt process, elaborated several
years ago, is the limit of the Schmidt chain constructed very
recently by Paz and Zurek.Comment: 8 pages REVTe
Equation and test of possible delay time of Newton force
Recently, a simple heuristic modification of the Newton potential with a
non-zero delay-time has been proposed. Our modification is largely
suppressed for purely gravitational interactions, it becomes relevant under
non-gravitational accelerations of the sources. We illustrate how the choice
ms may already influence the 5th digit of G determined by
Cavendish experiments. Re-evaluation of old Cavendish experiments and
implementing slightly modified new ones may confirm the proposal or, at least,
put a stronger upper limit on .Comment: 4 pp, 2 figs, based on talk at Int. Symp. Wigner 111 - Colourful &
Deep (Budapest, 11-13 Nov, 2013
Newton force from wave function collapse: speculation and test
The Diosi-Penrose model of quantum-classical boundary postulates
gravity-related spontaneous wave function collapse of massive degrees of
freedom. The decoherence effects of the collapses are in principle detectable
if not masked by the overwhelming environmental decoherence. But the DP (or any
other, like GRW, CSL) spontaneous collapses are not detectable themselves, they
are merely the redundant formalism of spontaneous decoherence. To let DP
collapses become testable physics, recently we extended the DP model and
proposed that DP collapses are responsible for the emergence of the Newton
gravitational force between massive objects. We identified the collapse rate,
possibly of the order of 1/ms, with the rate of emergence of the Newton force.
A simple heuristic emergence (delay) time was added to the Newton law of
gravity. This non-relativistic delay is in peaceful coexistence with Einstein's
relativistic theory of gravitation, at least no experimental evidence has so
far surfaced against it. We derive new predictions of such a `lazy' Newton law
that will enable decisive laboratory tests with available technologies. The
simple equation of 'lazy' Newton law deserves theoretical and experimental
studies in itself, independently of the underlying quantum foundational
considerations.Comment: 7pp, 7figs, based on talk at Int. Symp. on Emergent Quantum Mechanics
(Vienna, Oct 3-6, 2013
How to teach and think about spontaneous wave function collapse theories: not like before
A simple and natural introduction to the concept and formalism of spontaneous
wave function collapse can and should be based on textbook knowledge of
standard quantum state collapse and monitoring. This approach explains the
origin of noise driving the paradigmatic stochastic Schr\"odinger equations of
spontaneous localization of the wave function . It reveals, on the other
hand, that these equations are empirically redundant and the master equations
of the noise-averaged state are the only empirically testable
dynamics in current spontaneous collapse theories.Comment: Almost the published version p3-11 in "Collapse of the Wave
Function", ed.: S Gao, Cambridge University Press, 201
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