5,412 research outputs found
Variable stars in the globular cluster NGC 3201. I. Multimode SX Phe-type variables
We report on the discovery of eleven multimode SX Phoenicis--type blue
stragglers in the field of the southern globular cluster NGC 3201. In these
variables both radial and non-radial modes are excited. For three variables the
derived period ratio is close to that observed in SX Phoenicis itself,
suggesting that these stars are pulsating in the fundamental and the
first-overtone radial modes. Using the McNamara (1997) period-luminosity
relation we have estimated the apparent distance modulus to NGC 3201 to be
14.08mag.Comment: 10 pages, requires mn2e.cls,contact the first author at
[email protected] for high-resolution figure
NN Interaction JISP16: Current Status and Prospect
We discuss realistic nonlocal NN interactions of a new type - J-matrix
Inverse Scattering Potential (JISP). In an ab exitu approach, these
interactions are fitted to not only two-nucleon data (NN scattering data and
deuteron properties) but also to the properties of light nuclei without
referring to three-nucleon forces. We discuss recent progress with the ab
initio No-core Shell Model (NCSM) approach and respective progress in
developing ab exitu JISP-type NN-interactions together with plans of their
forthcoming improvements.Comment: 9 pages, 3 figures, to be published in Proceedings of Few-body 19
conferenc
Supergeometry and Arithmetic Geometry
We define a superspace over a ring as a functor on a subcategory of the
category of supercommutative -algebras. As an application the notion of a
-adic superspace is introduced and used to give a transparent construction
of the Frobenius map on -adic cohomology of a smooth projective variety over
the ring of -adic integers.Comment: 14 pages, expanded introduction, more detail
On the ubiquity of trivial torsion on elliptic curves
The purpose of this paper is to give a "down--to--earth" proof of the
well--known fact that a randomly chosen elliptic curve over the rationals is
most likely to have trivial torsion
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