36,443 research outputs found
Nucleon-antinucleon Interaction from the Modified Skyrme Model
We calculate the static nucleon-antinucleon interaction potential from the
modified Skyrme model with additional term using the product
ansatz. The static properties of single baryon are improved in the modified
Skyrme model. State mixing is taken into account by perturbation theory, which
substantially increases the strength of the central attraction. We obtain a
long and mid range potential which is in qualitative agreement with some
phenomenological potentials.Comment: 21 pages, 7 figur
Iterative Regularization for Learning with Convex Loss Functions
We consider the problem of supervised learning with convex loss functions and
propose a new form of iterative regularization based on the subgradient method.
Unlike other regularization approaches, in iterative regularization no
constraint or penalization is considered, and generalization is achieved by
(early) stopping an empirical iteration. We consider a nonparametric setting,
in the framework of reproducing kernel Hilbert spaces, and prove finite sample
bounds on the excess risk under general regularity conditions. Our study
provides a new class of efficient regularized learning algorithms and gives
insights on the interplay between statistics and optimization in machine
learning
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