5,091 research outputs found
Is a time symmetric interpretation of quantum theory possible without retrocausality?
Huw Price has proposed an argument that suggests a time-symmetric ontology
for quantum theory must necessarily be retrocausal, i.e. it must involve
influences that travel backwards in time. One of Price's assumptions is that
the quantum state is a state of reality. However, one of the reasons for
exploring retrocausality is that it offers the potential for evading the
consequences of no-go theorems, including recent proofs of the reality of the
quantum state. Here, we show that this assumption can be replaced by a
different assumption, called -mediation, that plausibly holds
independently of the status of the quantum state. We also reformulate the other
assumptions behind the argument to place them in a more general framework and
pin down the notion of time symmetry involved more precisely. We show that our
assumptions imply a timelike analogue of Bell's local causality criterion and,
in doing so, give a new interpretation of timelike violations of Bell
inequalities. Namely, they show the impossibility of a (non-retrocausal)
time-symmetric ontology.Comment: Accepted for publication in Proc. Roy. Soc. A., 18 pages, 3 figures,
revTeX4.
Jamming, two-fluid behaviour and 'self-filtration' in concentrated particulate suspensions
We study the flow of model experimental hard sphere colloidal suspensions at
high volume fraction driven through a constriction by a pressure
gradient. Above a particle-size dependent limit , direct microscopic
observations demonstrate jamming and unjamming--conversion of fluid to solid
and vice versa--during flow. We show that such a jamming flow produces a
reduction in colloid concentration downstream of the constriction.
We propose that this `self-filtration' effect is the consequence of a
combination of jamming of the particulate part of the system and continuing
flow of the liquid part, i.e. the solvent, through the pores of the jammed
solid. Thus we link the concept of jamming in colloidal and granular media with
a 'two-fluid'-like picture of the flow of concentrated suspensions. Results are
also discussed in the light of Osborne Reynolds' original experiments on
dilation in granular materials.Comment: 4 pages, 3 figure
Logical pre- and post-selection paradoxes are proofs of contextuality
If a quantum system is prepared and later post-selected in certain states,
"paradoxical" predictions for intermediate measurements can be obtained. This
is the case both when the intermediate measurement is strong, i.e. a projective
measurement with Luders-von Neumann update rule, or with weak measurements
where they show up in anomalous weak values. Leifer and Spekkens
[quant-ph/0412178] identified a striking class of such paradoxes, known as
logical pre- and post-selection paradoxes, and showed that they are indirectly
connected with contextuality. By analysing the measurement-disturbance required
in models of these phenomena, we find that the strong measurement version of
logical pre- and post-selection paradoxes actually constitute a direct
manifestation of quantum contextuality. The proof hinges on under-appreciated
features of the paradoxes. In particular, we show by example that it is not
possible to prove contextuality without Luders-von Neumann updates for the
intermediate measurements, nonorthogonal pre- and post-selection, and 0/1
probabilities for the intermediate measurements. Since one of us has recently
shown that anomalous weak values are also a direct manifestation of
contextuality [arXiv:1409.1535], we now know that this is true for both
realizations of logical pre- and post-selection paradoxes.Comment: In Proceedings QPL 2015, arXiv:1511.0118
Familial vasculitides: granulomatosis with polyangitis and microscopic polyangitis in two brothers with differing anti-neutrophil cytoplasm antibody specificity
Anti-neutrophil cytoplasm antibody (ANCA)-associated vasculitis (AAV) is a group of rare autoimmune diseases. Although the aetiology of AAV is uncertain, it is likely that genetic and environmental factors contribute. We report the unusual case of two brothers presenting with AAV with differing clinical pictures and differing ANCA specificity. There is a recently identified difference in genetic risk factors associated with ANCA specificity, making it surprising that first-degree relatives develop AAV with differing clinical and serological features. Our report illustrates the complex aetiology of AAV and suggests that further research on the interaction of genetic and environmental factors is needed
A sore red eye with systemic involvement
The study of happiness has long been a playground for philosophical speculation. By lack of empirical measures of happiness, it was not possible to check propositions about the matter. In the late 20th century, survey-research
methods introduced by the social sciences have brought a break-through.
Dependable measures of happiness have developed, by means of which a significant body of knowledge has evolved
- …