31,644 research outputs found
Reply to Norsen's paper "Are there really two different Bell's theorems?"
Yes. That is my polemical reply to the titular question in Travis Norsen's
self-styled "polemical response to Howard Wiseman's recent paper." Less
polemically, I am pleased to see that on two of my positions --- that Bell's
1964 theorem is different from Bell's 1976 theorem, and that the former does
not include Bell's one-paragraph heuristic presentation of the EPR argument ---
Norsen has made significant concessions. In his response, Norsen admits that
"Bell's recapitulation of the EPR argument in [the relevant] paragraph leaves
something to be desired," that it "disappoints" and is "problematic". Moreover,
Norsen makes other statements that imply, on the face of it, that he should
have no objections to the title of my recent paper ("The Two Bell's Theorems of
John Bell"). My principle aim in writing that paper was to try to bridge the
gap between two interpretational camps, whom I call 'operationalists' and
'realists', by pointing out that they use the phrase "Bell's theorem" to mean
different things: his 1964 theorem (assuming locality and determinism) and his
1976 theorem (assuming local causality), respectively. Thus, it is heartening
that at least one person from one side has taken one step on my bridge. That
said, there are several issues of contention with Norsen, which we (the two
authors) address after discussing the extent of our agreement with Norsen. The
most significant issues are: the indefiniteness of the word 'locality' prior to
1964; and the assumptions Einstein made in the paper quoted by Bell in 1964 and
their relation to Bell's theorem.Comment: 13 pages (arXiv version) in http://www.ijqf.org/archives/209
Soil penetrometer
An auger-type soil penetrometer for burrowing into soil formations is described. The auger, while initially moving along a predetermined path, may deviate from the path when encountering an obstruction in the soil. Alterations and modifications may be made in the structure so that it may be used for other purposes
Burrowing apparatus
A soil burrowing mole is described in which a housing has an auger blade wound around a front portion. This portion is rotatable about a housing longitudinal axis relative to an externally finned housing rear portion upon operation of driving means to cause an advance through soil and the like. The housing carries a sensor sensitive to deviation from a predetermined path and to which is coupled means for steering the housing to maintain the path
UK Soils: their phosphorus sorption capacity and potential for P removal from sewage effluents in emergent hydrophyte treatment systems
Analog of the Clauser-Horne-Shimony-Holt inequality for steering
The Clauser-Horne-Shimony-Holt (CHSH) inequality (and its permutations), are
necessary and sufficient criteria for Bell nonlocality in the simplest
Bell-nonlocality scenario: 2 parties, 2 measurements per party and 2 outcomes
per measurement. Here we derive an inequality for EPR-steering that is an
analogue of the CHSH, in that it is necessary and sufficient in this same
scenario. However, since in the case of steering the device at Bob's site must
be specified (as opposed to the Bell case in which it is a black box), the
scenario we consider is that where Alice performs two (black-box) dichotomic
measurements, and Bob performs two mutually unbiased qubit measurements. We
show that this inequality is strictly weaker than the CHSH, as expected, and
use it to decide whether a recent experiment [Phys. Rev. Lett. 110, 130401
(2013).] involving a single-photon split between two parties has demonstrated
EPR-steering.Comment: Expanded v2, new results, new figure. 9 pages, 2 figure
Higgs-regularized three-loop four-gluon amplitude in N=4 SYM: exponentiation and Regge limits
We compute the three-loop contribution to the N=4 supersymmetric Yang-Mills
planar four-gluon amplitude using the recently-proposed Higgs IR regulator of
Alday, Henn, Plefka, and Schuster. In particular, we test the proposed
exponential ansatz for the four-gluon amplitude that is the analog of the BDS
ansatz in dimensional regularization. By evaluating our results at a number of
kinematic points, and also in several kinematic limits, we establish the
validity of this ansatz at the three-loop level.
We also examine the Regge limit of the planar four-gluon amplitude using
several different IR regulators: dimensional regularization, Higgs
regularization, and a cutoff regularization. In the latter two schemes, it is
shown that the leading logarithmic (LL) behavior of the amplitudes, and
therefore the lowest-order approximation to the gluon Regge trajectory, can be
correctly obtained from the ladder approximation of the sum of diagrams. In
dimensional regularization, on the other hand, there is no single dominant set
of diagrams in the LL approximation. We also compute the NLL and NNLL behavior
of the L-loop ladder diagram using Higgs regularization.Comment: 45 pages, 9 figures; v3: major revision (more stringent tests,
discussion of order of limits in the Regge regime
Serrated trailing edges for improving lift and drag characteristics of lifting surfaces
An improvement in the lift and drag characteristics of a lifting surface is achieved by attaching a serrated panel to the trailing edge of the lifting surface. The serrations may have a saw-tooth configuration, with a 60 degree included angle between adjacent serrations. The serrations may vary in shape and size over the span-wise length of the lifting surface, and may be positioned at fixed or adjustable deflections relative to the chord of the lifting surface
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