2,563 research outputs found
A Berger type normal holonomy theorem for complex submanifolds
We prove a kind of Berger-Simons' Theorem for the normal holonomy group of a complex submanifold of the projective spac
Holonomy and submanifold geometry
We survey applications of holonomic methods to the study of submanifold geometry, showing the consequences of some sort of extrinsic version of de Rham decomposition and Berger's Theorem, the so-called Normal Holonomy Theorem. At the same time, from geometric methods in submanifold theory we sketch very strong applications to the holonomy of Lorentzian manifolds. Moreover we give a conceptual modern proof of a result of Kostant for homogeneous space
Amplifying single impurities immersed in a gas of ultra cold atoms
We present a method for amplifying a single or scattered impurities immersed
in a background gas of ultra cold atoms so that they can be optically imaged
and spatially resolved. Our approach relies on a Raman transfer between two
stable atomic hyperfine states that is conditioned on the presence of an
impurity atom. The amplification is based on the strong interaction among atoms
excited to Rydberg states. We perform a detailed analytical study of the
performance of the proposed scheme with particular emphasis on the influence of
many-body effects.Comment: 5 pages, 4 figure
Fermionic collective excitations in a lattice gas of Rydberg atoms
We investigate the many-body quantum states of a laser-driven gas of Rydberg
atoms confined to a large spacing ring lattice. If the laser driving is much
stronger than the van-der-Waals interaction among the Rydberg sates, these
many-body states are collective fermionic excitations. The first excited state
is a spin-wave that extends over the entire lattice. We demonstrate that our
system permits to study fermions in the presence of disorder although no
external atomic motion takes place. We analyze how this disorder influences the
excitation properties of the fermionic states. Our work shows a route towards
the creation of complex many-particle states with atoms in lattices
Gershon BRIN, Studies in Bibllcal Law. From the Hebrew to the Dead Sea Scrolls, JSOT Press, Sheffield 1994, 310 pp., 14 x 23. [RECENSIÓN]
Francesco VATTIONI (dir.), Sangue e Antropologia BÃblica. Atti della Settimana a cura «Centro Studi Sanguis Christi», Roma, Pia Unione Preziosissimo Sangue, 1981, 910 pp., 17 x 24. [RECENSIÓN]
Emile PUECH, La croyance des Esséniens en la vie future: Immortalité, resurrection, vie éternelle? Histoire d'une croyance dans le judaïsme ancien. Vol. I: «La résurrection des morts et le contexte scripturaire»; vol. II: «Les données qumraniennes et clasiques», Éd. Gabalda, Paris 1993, 956 pp. 16 x 24. [RECENSIÓN]
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