Math @ Duke
Publications [#243390] of Robert Bryant
- Bryant, RL, Submanifolds and special structures on the octonians,
Journal of Differential Geometry, vol. 17 no. 2
pp. 185-232, International Press of Boston [MR84h:53091], [doi]
(last updated on 2019/08/25)
A study of the geometry of submanifolds of real 8-space
group of motions generated by translations and
rotations in the subgroup
Spin(7) instead of the full SO(8). I call real 8-space
endowed with this
O or octonian space.
The fact that the stabilizer of an oriented 2-plane in
Spin(7) is U(3)
implies that any oriented 6-manifold in O
inherits a U(3)-structure.
The first part of the paper studies the generality of the
inherited U(3)-structure is symplectic, complex, or
Kähler, etc. by
applying the theory of exterior differential systems.
I then turn to the study of the standard 6-sphere in
O as an
almost complex manifold and study the space of what
are now called pseudo-holomorphic
curves in the 6-sphere. I prove that every compact
Riemann surface occurs
as a (possibly ramified) pseudo-holomorphic curve in
the 6-sphere. I also
show that all of the genus zero pseudo-holomorphic
curves in the 6-sphere
are algebraic as surfaces.
Reprints are available.
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