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Drilling string vibration: Modelling and simulation
The offshore industry has a significant impact on the globaleconomy and it is expected to grow over the next 4 years. Acrucial part of an offshore structure is the drill string. Drillstrings can be seriously damaged by ...
Topological string on OSP(1|2)/U(1)
(Springer, 2009-12)
We propose an equivalence between topological string on OSP(1|2)/U(1) and Ĉ ≥ 1 superstring with = 1 world-sheet supersymmetry. We examine this by employing a free field representation of OSP(1|2) WZNW model and find an ...
Bosonic sectorized strings and the (DF)(2) theory
(Springer, 2020-01-15)
In this work, we investigate the bosonic chiral string in the sectorized inter- pretation, computing its spectrum, kinetic action and 3-point amplitudes. As expected, the bosonic ambitwistor string is recovered in the ...
Document retrieval on repetitive string collections
(Springer, 2017-06)
Most of the fastest-growing string collections today are repetitive, that is, most of the constituent documents are similar to many others. As these collections keep growing, a key approach to handling them is to exploit ...
Cubic twistorial string field theory
(2004-04-01)
Witten has recently proposed a string theory in twistor space whose D-instanton contributions are conjectured to compute M = 4 super-Yang-Mills scattering amplitudes. An alternative string theory in twistor space was then ...
Field theory actions for ambitwistor strings
(Universidade Estadual Paulista (Unesp), 2021-04-19)
É apresentado um extenso estudo sobre modelos de ambitwistors. Nós construímos a ação livre da teoria de campo de cordas do ambitwistor para a corda bosônica, corda heterótica e ambos setores GSO da corda tipo II. As ações ...
Supertwistor description of ambitwistor strings
(2020-01-01)
A new ambitwistor string is constructed based on a ten-dimensional super-twistor model for the massless superparticle. Although covariant quantization is complicated by reducibility issues, a light-cone gauge analysis can ...
String-averaging expectation-maximization for maximum likelihood estimation in emission tomography
(Iop Publishing Ltd, 2014-05-01)
We study the maximum likelihood model in emission tomography and propose a new family of algorithms for its solution, called string-averaging expectation maximization (SAEM). In the string-averaging algorithmic regime, the ...
P T -symmetric strings
(Elsevier, 2014-04)
We study both analytically and numerically the spectrum of inhomogeneous strings with PT-symmetric density. We discuss an exactly solvable model of PT-symmetric string which is isospectral to the uniform string; for more ...
On non-homogeneous tachyon condensation in closed string theory
(Springer, 2017-08)
Lorentzian continuation of the Sine-Liouville model describes non-homogeneous rolling closed string tachyon. Via T-duality, this relates to the gauged H+ 3 Wess-Zumino-Witten model at subcritical level. This model is exactly ...