3,898 research outputs found
An R Implementation of the Polya-Aeppli Distribution
An efficient implementation of the Polya-Aeppli, or geometirc compound
Poisson, distribution in the statistical programming language R is presented.
The implementation is available as the package polyaAeppli and consists of
functions for the mass function, cumulative distribution function, quantile
function and random variate generation with those parameters conventionally
provided for standard univatiate probability distributions in the stats package
in RComment: 9 pages, 2 figure
Toroidal Spiral Nambu-Goto Strings around Higher-Dimensional Black Holes
We present solutions of the Nambu-Goto equation for test strings in a shape
of toroidal spiral in five-dimensional spacetimes. In particular, we show that
stationary toroidal spirals exist around the five-dimensional Myers-Perry black
holes. We also show the existence of innermost stationary toroidal spirals
around the five-dimensional black holes like geodesic particles orbiting around
four-dimensional black holes.Comment: 9 pages, 5 figure
Stationary Closed Strings in Five-dimensional Flat Spacetime
We investigate stationary rotating closed Nambu-Goto strings in
five-dimensional flat spacetime. The stationary string is defined as a
worldsheet that is tangent to a timelike Killing vector. Nambu-Goto equation of
motion for the stationary string is reduces to the geodesic equation on the
orbit space of the isometry group action generated by the Killing vector. We
take a linear combination of a time-translation vector and space-rotation
vectors as the Killing vector, and explicitly construct general solutions of
stationary rotating closed strings in five-dimensional flat spacetime. We show
a variety of their configurations and properties.Comment: 22 pages, 17 figure
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