On the volume of a unit vector field on the three-sphere

1986 ◽  
Vol 61 (1) ◽  
pp. 177-192 ◽  
Author(s):  
Herman Gluck ◽  
Wolfgang Ziller
Keyword(s):  
Vector Field ◽  
Unit Vector ◽  
Three Sphere ◽  
Unit Vector Field

scholarly journals Knots connected by wide ribbons

2019 ◽  
Vol 28 (12) ◽  
pp. 1950071
Author(s):  
Susan C. Brooks ◽  
Oguz Durumeric ◽  
Jonathan Simon
Keyword(s):  
Vector Field ◽  
Constant Width ◽  
Unit Vector ◽  
Outer Edge ◽  
Smooth Mapping ◽  
Unit Vector Field ◽  
Finite Set

A ribbon is a smooth mapping (possibly self-intersecting) of an annulus [Formula: see text] in 3-space having constant width [Formula: see text]. Given a regular parametrization [Formula: see text], and a smooth unit vector field [Formula: see text] based along [Formula: see text], for a knot [Formula: see text], we may define a ribbon of width [Formula: see text] associated to [Formula: see text] and [Formula: see text] as the set of all points [Formula: see text], [Formula: see text]. For large [Formula: see text], ribbons, and their outer edge curves, may have self-intersections. In this paper, we analyze how the knot type of the outer ribbon edge [Formula: see text] relates to that of the original knot [Formula: see text]. Generically, as [Formula: see text], there is an eventual constant knot type. This eventual knot type is one of only finitely many possibilities which depend just on the vector field [Formula: see text]. The particular knot type within the finite set depends on the parametrized curves [Formula: see text], [Formula: see text], and their interactions. We demonstrate a way to control the curves and their parametrizations so that given two knot types [Formula: see text] and [Formula: see text], we can find a smooth ribbon of constant width connecting curves of these two knot types.

scholarly journals A new quaternion valued frame of curves with an application

Filomat ◽  
2021 ◽  
Vol 35 (1) ◽  
pp. 315-330
Author(s):  
Gizem Cansu ◽  
Yusuf Yaylı ◽  
İsmail Gök
Keyword(s):  
Vector Field ◽  
Unit Vector ◽  
Space Curve ◽  
Unit Vector Field ◽  
The Right

The aim of the paper is to obtain a new version of Serret-Frenet formulae for a quaternionic curve in R4 by using the method given by Bharathi and Nagaraj. Then, we define quaternionic helices in H named as quaternionic right and left X-helix with the help of given a unit vector field X. Since the quaternion product is not commutative, the authors ([4], [7]) have used by one-sided multiplication to find a space curve related to a given quaternionic curve in previous studies. Firstly, we obtain new expressions by using the right product and the left product for quaternions. Then, we generalized the construction of Serret-Frenet formulae of quaternionic curves. Finally, as an application, we obtain an example that supports the theory of this paper.

Gauge freedom, anholonomy, and Hopf index of a three-dimensional unit vector field

1993 ◽  
Vol 47 (9) ◽  
pp. 5438-5441 ◽  
Author(s):  
Radha Balakrishnan ◽  
A. R. Bishop ◽  
R. Dandoloff
Keyword(s):  
Vector Field ◽  
Three Dimensional ◽  
Unit Vector ◽  
Gauge Freedom ◽  
Unit Vector Field ◽  
Dimensional Unit

scholarly journals Slant Curves in the Unit Tangent Bundles of Surfaces

ISRN Geometry ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Zhong Hua Hou ◽  
Lei Sun
Keyword(s):  
Vector Field ◽  
Tangent Bundle ◽  
Unit Vector ◽  
Sasaki Metric ◽  
Geometric Properties ◽  
Unit Vector Field ◽  
Unit Tangent Bundle ◽  
Tangent Bundles ◽  
Slant Curves

Let (M,g) be a surface and let (U(TM),G) be the unit tangent bundle of M endowed with the Sasaki metric. We know that any curve Γ(s) in U(TM) consist of a curve γ(s) in M and as unit vector field X(s) along γ(s). In this paper we study the geometric properties γ(s) and X(s) satisfying when Γ(s) is a slant geodesic.

scholarly journals A Ginzburg–Landau Type Energy with Weight and with Convex Potential Near Zero

Mathematics ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 997
Author(s):  
Rejeb Hadiji ◽  
Carmen Perugia
Keyword(s):  
Asymptotic Behavior ◽  
Vector Field ◽  
Lower Bound ◽  
Unit Vector ◽  
Ginzburg Landau ◽  
Positive Weight ◽  
Unit Vector Field

In this paper, we study the asymptotic behavior of minimizing solutions of a Ginzburg–Landau type functional with a positive weight and with convex potential near 0 and we estimate the energy in this case. We also generalize a lower bound for the energy of unit vector field given initially by Brezis–Merle–Rivière.

scholarly journals A topological lower bound for the energy of a unit vector field on a closed Euclidean hypersurface

2020 ◽  
Vol 125 (3) ◽  
pp. 203-213
Author(s):  
Fabiano G. B. Brito ◽  
Icaro Gonçalves ◽  
Adriana V. Nicoli
Keyword(s):  
Vector Field ◽  
Lower Bound ◽  
Unit Vector ◽  
Unit Vector Field ◽  
Euclidean Hypersurface

scholarly journals Stripe patterns and a projection-valued formulation of the eikonal equation

2012 ◽  
Vol 370 (1965) ◽  
pp. 1730-1739 ◽  
Author(s):  
Mark A. Peletier ◽  
Marco Veneroni
Keyword(s):  
Vector Field ◽  
Block Copolymers ◽  
Recent Work ◽  
Eikonal Equation ◽  
Unit Vector ◽  
Unit Vector Field ◽  
New Formulation ◽  
Projection Matrices

We describe recent work on striped patterns in a system of block copolymers. A by-product of the characterization of such patterns is a new formulation of the eikonal equation. In this formulation, the unknown is a field of projection matrices of the form P = e ⊗ e , where e is a unit vector field. We describe how this formulation is better adapted to the description of striped patterns than the classical eikonal equation, and illustrate this with examples.

An improved gravitational formalism

1978 ◽  
Vol 56 (9) ◽  
pp. 1202-1203 ◽  
Author(s):  
Peter Rastall
Keyword(s):  
Vector Field ◽  
Scalar Potential ◽  
Unit Vector ◽  
Space Time ◽  
Unit Vector Field ◽  
Theory Of Gravity ◽  
Special Case

In earlier papers, a theory of gravity was developed in which the space-time metric depends on a unit vector field and a scalar potential. The formalism becomes much simpler if one uses just a vector field. The theory is equivalent to a special case of the earlier one.

scholarly journals The Einstein–Maxwell-aether-axion theory: Dynamo-optical anomaly in the electromagnetic response

2016 ◽  
Vol 25 (04) ◽  
pp. 1650048 ◽  
Author(s):  
Timur Yu. Alpin ◽  
Alexander B. Balakin
Keyword(s):  
Electromagnetic Field ◽  
Vector Field ◽  
Exact Solutions ◽  
Unit Vector ◽  
Anomalous Behavior ◽  
Electromagnetic Response ◽  
Symmetric Model ◽  
Electrodynamic System ◽  
Electric And Magnetic Fields ◽  
Pp Wave

We consider a pp-wave symmetric model in the framework of the Einstein–Maxwell-aether-axion theory. Exact solutions to the equations of axion electrodynamics are obtained for the model, in which pseudoscalar, electric and magnetic fields were constant before the arrival of a gravitational pp-wave. We show that dynamo-optical interactions, i.e. couplings of electromagnetic field to a dynamic unit vector field, attributed to the velocity of a cosmic substratum (aether, vacuum, dark fluid[Formula: see text]), provide the response of axionically active electrodynamic system to display anomalous behavior.

Geodesics on the unit tangent bundle

2003 ◽  
Vol 133 (6) ◽  
pp. 1209-1229 ◽  
Author(s):  
J. Berndt ◽  
E. Boeckx ◽  
P. T. Nagy ◽  
L. Vanhecke
Keyword(s):  
Riemannian Manifold ◽  
Vector Field ◽  
Tangent Bundle ◽  
Unit Vector ◽  
Sphere Bundle ◽  
Sasaki Metric ◽  
Tangent Sphere Bundle ◽  
Tangent Sphere ◽  
Unit Tangent Bundle ◽  
Unit Tangent Sphere Bundle

A geodesic γ on the unit tangent sphere bundle T1M of a Riemannian manifold (M, g), equipped with the Sasaki metric gS, can be considered as a curve x on M together with a unit vector field V along it. We study the curves x. In particular, we investigate for which manifolds (M, g) all these curves have constant first curvature κ1 or have vanishing curvature κi for some i = 1, 2 or 3.

Sign in / Sign up

Export Citation Format

Share Document