21,064 research outputs found
Down to earth relativity
The basic concepts of the special and general theories of relativity are described. Simple examples are given to illustrate the effect of relativity on measurements of time and frequency in the near-earth environment
Frobenius map for quintic threefolds
We calculate the matrix of the Frobenius map on the middle dimensional
cohomology of the one parameter family that is related by mirror symmetry to
the family of all quintic threefolds.Comment: 19 pages, discussion of -adic zeta values adde
BRST Reduction of the chiral Hecke Algebra
We explore the relationship between de Rham and Lie algebra cohomologies in
the finite dimensional and affine settings. As an application, we describe the
BRST reduction of the chiral Hecke algebra as a vertex super algebra.Comment: 35 page
Viking radio science data analysis and synthesis
Viking radio data analysis and synthesis was used for the following: (1) Solar System Model and Data Set; (2) Rotation of Mars; and (3) Solar System Constants and Tests of Relativity
Principles of very-long-baseline interferometry
The basic principles of very-long-baseline interferometry as related to its use in the determination of vector baselines, polar motion, and earth rotation are presented. Aspects relevant to geodetic applications that involve observations of extragalactic radio sources are covered. The instrumentation used in these observations and the basic observables and their simplest interpretation are described. Complications of the interpretation due to the various geophysical 'signals' and nongeophysical 'noise' that affect the observables are considered
Majorana states in a p-wave superconducting ring
The spectrum of excitations of the chiral superconducting ring with internal
and external radii, comparable with coherence length, trapping a unit flux is
calculated. We find within the Bogoliubov-deGennes approach that there exists a
pair of precisely zero energy states. They are not protected by topology, but
are stable under certain deformations of the system. We discuss the ways to
tune the system so that it grows into such a "Majorana disk". This condition
has a character of a resonance phenomenon
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