We introduce a gauge invariant and string independent two-point fermion correlator which is analyzed in the context of the Schwinger model (QED2). We also derive an effective infrared worldline action for this correlator, thus enabling the computation of its infrared behavior. Finally, we briefly discuss possible perspectives for the string independent correlator in the QED3 effective models fo...

The Time Of Arrival (TOA) of a received signal is the most important parameter for position estimation. The accuracy of the estimated TOA is limited by multipath errors. Consequently, multipath mitigation techniques are essential for high accuracy positioning using TOA observations. Narrow Correlator and double delta correlator were introduced to reduce multipath errors in pseudoranges. These c...

While the Reichardt correlator and its mathematical equivalents do not signal true image velocity, a great deal of experimental evidence establishes them as mechanisms for visual motion detection in insects, humans, and other animals. This study examines the accuracy with which Reichardt correlators can provide velocity estimates in an organism’s natural visual environment. I develop an analyti...

We determine the mass of the lightest q̄q scalar meson with I = 1 using the simulation with two dynamical Domain Wall Fermions. The conventional exponential fit of the scalar correlator is justified in this case giving the mass 1.58± 0.34 GeV. In general the scalar correlator receives also the bubble contribution, which is the intermediate state with two pseudoscalar mesons. This contribution is...

The SFXC software correlator has become the primary correlator for the EVN. Due to its nature a software correlator is much more flexible than a hardware solution, greatly simplifying the development of new correlator features. SFXC offers a number of new features which were not previously available to EVN users. These new features include: Pulsar binning and gating, multiple simultaneous phase...