11,528 research outputs found
Pseudoclassical model for Weyl particle in 10 dimensions
A pseudoclassical model to describe Weyl particle in 10 dimensions is
proposed. In course of quantization both the massless Dirac equation and the
Weyl condition are reproduced automatically. The construction can be relevant
to Ramond-Neveu-Schwarz strings where the Weyl reduction in the Ramond sector
has to be made by hand.Comment: 5 page
Quenching Star Formation in the Green Valley: The Mass Flux at Intermediate Redshifts
We have obtained several hundred very deep spectra with DEIMOS/Keck in order
to estimate the galactic mass flux density at intermediate redshifts (0.6 < z < 0.9) from the
”blue cloud” to the red sequence across the so-called ”green valley”, the intermediate region in
the color-magnitude plot between those two populations. We use spectral indices (specifically
D_n (4000) and H_(δ,A)) to determine star formation histories. Together with an independent measurement
of number density of galaxies in each bin of the color-magnitude plot, one can infer
the rate at which galaxies from a given sample are transiting through that bin. Measuring this
value for all magnitude values, studies at lower redshift determined that the mass flux density
in the green valley is comparable to both the mass build-up rate of the red sequence and the
mass loss rate from the blue cloud. We show preliminary results for our intermediate redshift
sample
Experimental Evidence on English Auctions: Oral Outcry vs. Clock
This paper tests experimentally, in a common value setting, the equivalence between the Japanese English auction (or clock auction) and an open outcry auction, where bidders are allowed to call their own bids. We find that (i) bidding behaviour is different in each type of auction, but also that (ii) this difference in bidding behaviour does not affect significantly the auction prices. This lends some support to the equivalence between these two types of auction. The winner's curse is present: overbidding led to higher than expected prices (under Nash bidding strategies) in both types of auction.English auctions, discrete bidding, winner's curse
- …