نتایج جستجو برای: string stability
تعداد نتایج: 343426 فیلتر نتایج به سال:
Z-strings in the Weinberg-Salam model including fermions are unstable for all values of the parameters. The cause of this instability is the fermion vacuum energy in the Z-string background. Z-strings with non-zero fermion densities, however, may still be stable. ⋆ e-mail: [email protected] The recent discovery of cosmic string solutions in the Weinberg-Salam model of electroweak inter...
The problem of controlling a string of vehicles moving in one dimension is considered so that they all follow a lead vehicle with constant spacing between successive vehicles. The goal of this paper is to consider the effects of parasitic time delays, lags and comfort specification. The contribution of this paper is two-fold. First, negative effects of the parasitic time delays and lags on the ...
A Fibonacci string of length $n$ is a binary string $b = b_1b_2ldots b_n$ in which for every $1 leq i < n$, $b_icdot b_{i+1} = 0$. In other words, a Fibonacci string is a binary string without 11 as a substring. Similarly, a Lucas string is a Fibonacci string $b_1b_2ldots b_n$ that $b_1cdot b_n = 0$. For a natural number $ngeq1$, a Fibonacci cube of dimension $n$ is denoted by $Gamma_n$ and i...
The method of fracturing of oil gas reservoir is considered as an instrumental one for maximizing the yield. Multiple loads in a well fracturing operation may compel tubing string to yield, break and/buckle in a permanent spiral, leading to severe financial deficit. Mathematical models for mechanical analysis of fracturing string in whole fracturing operation are developed on the basis of opera...
A bstract We find that a Z -string is stable in wide range of parameter space the two Higgs doublet model due to split into pair topological -strings with fractional fluxes. This configuration, bound state strings connected by domain wall, called vortex molecule. Although molecule has no net charge, locally induced charge density polarized, namely distributed positively around one constituent s...
In this paper, the rotating black brane solutions with zero curvature horizon of classical gravity with first order string corrections are introduced. Although these solutions are not asymptotically anti de Sitter, one can use the counterterm method in order to compute the conserved quantities of these solutions. Here, by reviewing the counterterm method for asymptotically anti de Sitter spac...
ABSTRACT Background and Objectives: Pseudomonas aeruginosa is an important non-fermenting gram-negative hospital-acquired pathogen. Treatment of P. aeruginosa infections has become more challenging due to overexpression of efflux pumps. The aim of the present study was to apply in silico analysis to evaluate the structure of the effl...
We classify potential cosmic strings according to the topological charge measurable outside the string core. We conjecture that in string theory it is this charge that governs the stability of long strings. This would imply that the SO(32) heterotic string can have endpoints, but not the E8 × E8 heterotic string. We give various arguments in support of this conclusion. 1 Stability of cosmic str...
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