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The IUP Journal of Physics :
Non-Null Helices in a Lorentzian 6-Space
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The aim of this paper is to determine the Frenet-Serret invariants of non-null curves in a Lorentzian 6-space. First, we introduce a vector which is derived from five vectors. By this way we present a method to calculate Frenet-Serret invariants of the non-null helices. Additionally, an algebraic example of our method is presented.

 
 

In the local differential geometry, the Frenet-Serret frame has the basic importance to investigate characterizations of the curves. For instance, curvature functions give us the behavior of the curves. In local differential geometry, we think of curves as a geometric set of points or locus. Therefore, investigating Frenet-Serret frame of the curve is a classical aim to determine its behavior. There is an extensive literature on the subject, for instance, in Magden (1990), the author presented a method to calculate Frenet-Serret apparatus of the regular curves in the Euclidean 4-space. Thereafter, Yilmaz (2001), adapted this method to spacelike curves of Minkowski 4-space according to signature and investigated spherical images of such curves. However, in the existing literature, the works were commonly based on the spacelike and timelike curves of Minkowski space-time with signature . Since, in Yilmaz and Turgut (2008) and Yilmaz et al. (2009), respectively, the mentioned method (originally expressed as in was adapted and developed for spacelike and timelike curves of Minkowski space-time. Recently, in Turgut et al. (2009), the same idea is studied for non-null curves of Lorentzian 5-space by the spirit of the paper (Yilmaz and Turgut, 2008). Einstein's theory opened a door to using new geometries and thus, the researchers discovered a bridge between modern differential geometry and mathematical physics. Generally they used the concepts of a mapping and a curve. For instance, a `particle' in special relativity means a curve with a timelike unitary tangent vector, for details (Caltenco et al., 2002); and in another work, it has also been observed that the third curvature is important (Kichenassamy, 2003). Thereafter, null cases were also studied to make an understanding tool of general relativity as a dynamical theory and the Frenet-Serret formalism and by this way black holes were investigated in five and six dimensional space by considering a timelike curve (Iyer and Vishveshwara, 1988; and Capovilla et al., 2006). However, this paper did not include an explicit calculation of Frenet-Serret frame with a vector derived from a generalization of cross product in Lorentzian space. A curve of constant slope or general helix is defined by the property that the tangent lines make a constant angle with a fixed direction. A necessary and sufficient condition that a curve to be a general helix in Minkowski 3-space is that the ratio of curvature to torsion be constant (Ferrnández et al., 2001). Indeed, a helix is a special case of the general helix. If both curvature and torsion are non-zero constants, it is called a helix or only a W-curve
Helices arise in nanosprings, carbon nanotubes, a-helices, DNA double and collagen triple helix, the double helix shape is commonly associated with DNA, since the double helix is the structure of DNA (Camci et al., 2009). This fact was first published by Watson and Crick (1953). They constructed a molecular model of DNA in which there were two complementary, antiparallel (side-by-side in opposite directions) strands of the bases guanine, adenine, thymine and cytosine, covalently linked through phosphodiesterase bonds (Cook, 1979; Chouaieb et al., 2006; and Camci et al., 2009). In this work, we extend the notion of calculate Frenet-Serret apparatus of helices (W-curves) considering the paper of Yilmaz and Turgut (2009) which contains regular observations of helices in six dimensional Euclidean space. Additionally, we express an example of our main results. We hope these results will be helpful to mathematicians who are specialized in mathematical modeling.

 
 

Physics Journal, Non-Null Helices, Lorentzian 6-Space, Collagen Triple Helix, Mathematical Modeling, Arbitrary Constant Electromagnetic Field, Orthonormal Frame, Frenet-Serret Frame, Pseudo-Euclidean Space, Phosphodiesterase Bonds, Dynamical Theory.