# covariant derivative

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## covariant derivative

[kō′ver·ē·ənt də′riv·əd·iv]
(mathematics)
For a tensor field at a point P of an affine space, a new tensor field equal to the difference between the derivative of the original field defined in the ordinary manner and the derivative of a field whose value at points close to P are parallel to the value of the original field at P as specified by the affine connection.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Finally, in terms of the explicit notation for the covariant derivative, the integrability condition takes the form
The covariant derivative operator associated with the connection [theta] is defined by
where [f.sub.G](G, T) = [partial derivative]f(G, T)/[partial derivative]G, [f.sub.T](G, T) = [partial derivative]f(G, T)/[partial derivative]T, [[nabla].sup.2] = [[nabla].sub.[mu]][[nabla].sup.[mu]] ([[nabla].sub.[mu]] is a covariant derivative), and [[THETA].sub.[mu][nu]] has the following expression :
where D is the covariant derivative on (N, h) and [nabla] is the covariant derivative on (M,g).
or d[THETA] = [[nabla].sub.j][[theta].sub.i][u.sup.i.sub.1][u.sup.j.sub.2] + [[theta].sub.i][U.sup.i.sub.12] with the covariant derivative [[nabla].sub.j][[theta].sub.i] = [[theta].sub.i,j] - [[theta].sub.k][[GAMMA].sup.k.sub.ij].
By virtue of covariant derivative of (7) with respect to Z we get
Continue the above set up, define a covariant derivative on free loop space as follows.
As usual, a BRST operator is formed as Q = [[lambda].sup.A[alpha]][D.sub.A[alpha]], D being the fermionic covariant derivative. The nilpotency of Q demands that
The local derivative operators "[sub./1]", "[sub.|p]"and "[|.sup.(1).sub.(p)])" are called the R-horizontal covariant derivative, the M-horizontal covariant derivative and the vertical covariant derivative associated to the [GAMMA]-linear connection [nabla][gamma].
In parallel to SME exists an alternative procedure that consists in modifying the interaction part using a nonminimal coupling via covariant derivative. In this paper, the nonminimal coupling term, CPT-odd term, is used to calculate the Lorentz-violating corrections to Moller scattering at finite temperature.
Let [h.sub.ijk] denote the covariant derivative of [h.sub.ij] so that
Consequently, the covariant derivative of the world-metric tensor fails to vanish in the present theory, as we obtain the following non-metric expression:

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