# spin vector

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## spin vector

n. Physics
A vector quantity used to represent the spin angular momentum of a particle. Its magnitude represents the magnitude of the spin, while its direction lies along the axis of rotation of the particle, following the right-hand rule.
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Let ([M.sup.2], g) be an oriented Riemannian surface and E an oriented and spin vector bundle of rank 2 over M with scalar product (*,*)E and compatible connection [[nabla].sup.E].
The winner of the 'Best S Pen Apps' category's grand prize is From Cheese developed by an Italian company Spin Vector. The application allows users to play with the S Pen to lure a mouse to the cheese by drawing a scented trail on the screen.
At this point, we may note that the spin vector ' is always orthogonal to the world-velocity vector as
This is a Pauli current; S is a spin vector and [??] = [psi] [chi] where [chi] (and [??]) is a 2-component spinor.
Suppose that a spin vector in a spatial region of ordered spin vectors in the ground state with SBS happens to deviate slightly from the aligned direction of all the other spin vectors.
In a general coordinate system the spin vector in parallel obeys the equation:
The most important features of neutron decay are described by the formula of Jackson, Treiman, and Wyld , which gives the neutron decay probability as a function of the emitted ([p.sub.e]) and antineutrino ([p.sub.v]) momenta, and the direction of the initial neutron's spin vector ([sigma]):
where [[sigma].sup.[mu]] are the components of the non-integrable four-dimensional macroscopic displacement field vector, [[phi].sup.[mu]] are the components of the four-dimensional microscopic (micropolar) intrinsic spin vector, [bar.e] is a constant proportional to the electric charge, and [[phi].sup.[mu] are the components of the electromagnetic four-potential vector.
A propagating neutron experiences a transverse rotation of its spin vector about its momentum axis--an effect which manifestly violates parity.
An axial magnetic field will rotate a transverse spin vector about the momentum axis.
In the AF phase the symmetry generator is given by the spin vector S = ([S.sub.x], [S.sub.y], [S.sub.z]) (6a).

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