Variable Field Beta‐Ray Spectrometer‐Spectrograph

Physics Today Improvements in the precision of betaray spectroscopy

Mean Field Approximation in Bayesian Variable Selection

Variable selection for a multiple regression model (Noisy Linear Perceptron) is studied with a mean field approximation. In our Bayesian framework, variable selection is formulated as estimation of discrete parameters that indicate a subset of the explanatory variables. Then, a mean field approximation is introduced for the calculation of the posterior averages over the discrete parameters. An ...

Wide-Field Survey Reveals the Variable Sky

Figure 1. A comparison in area and depth between current major surveys and the FSVS. Adapted from the National Optical Astronomy Observatory (NOAO) Deep Wide-Field Survey Web pages (see www. noao.edu/noao/noaodeep/): SDSS, Sloan Digital Sky Survey (York et al. 2000); EIS (deep), ESO Imaging Survey (Deep) (Nonino et al. 1999); Deeprange, (Postman et al. 1998); INT-WAS, INT Wide Angle Survey (McM...

Variable Field Bending Magnets for Recirculating Linacs

A lattice of single aperture superconducting variable field bending magnets is proposed as a cheap and practical way to recirculate the beams in recirculating linear accelerators. It is shown that the VFBM's can be configured to provide strong focusing in both transverse planes for the full range of beam momenta transported by the lattice.

Field theory models for variable cosmological constant

Anthropic solutions to the cosmological constant problem require seemingly unnatural scalar field potentials with a very small slope or domain walls (branes) with a very small coupling to a four-form field. Here we introduce a class of models in which the smallness of the corresponding parameters can be attributed to a spontaneously broken discrete symmetry. We also demonstrate the equivalence ...