1,512 research outputs found
Group Discounts Compatible with Buyer Privacy
We show how group discounts can be offered without forcing buyers to
surrender their anonymity, as long as buyers can use their own computing
devices (e.g. smartphone, tablet or computer) to perform a purchase.
Specifically, we present a protocol for privacy-preserving group discounts. The
protocol allows a group of buyers to prove how many they are without disclosing
their identities. Coupled with an anonymous payment system, this makes group
discounts compatible with buyer privacy (that is, buyer anonymity).Comment: Presented at 9th DPM International Workshop on Data Privacy
Management (DPM 2014, Sep. 10,2014). To appear in workshop proceedings, LNCS,
Springe
Chiral Fermions on the Lattice through Gauge Fixing -- Perturbation Theory
We study the gauge-fixing approach to the construction of lattice chiral
gauge theories in one-loop weak-coupling perturbation theory. We show how
infrared properties of the gauge degrees of freedom determine the nature of the
continuous phase transition at which we take the continuum limit. The fermion
self-energy and the vacuum polarization are calculated, and confirm that, in
the abelian case, this approach can be used to put chiral gauge theories on the
lattice in four dimensions. We comment on the generalization to the nonabelian
case.Comment: 31 pages, 5 figures, two refs. adde
Mobility edge in lattice QCD
We determine the location of the mobility edge in the spectrum of
the hermitian Wilson operator on quenched ensembles. We confirm a theoretical
picture of localization proposed for the Aoki phase diagram. When
we also determine some key properties of the localized eigenmodes with
eigenvalues . Our results lead to simple tests for the
validity of simulations with overlap and domain-wall fermions.Comment: revtex, 4 pages, 1 figure, minor change
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