It is a specialisation of Is there a non-contractible Simplicial Complex with Euler Characteristic 1?
Here is a list of non-contractible simplicial complex with Euler characteristic $1$:
- non-homogeneous: an octahedron with an edge running through the middle (see this answer)
- non-oriented: triangulation of the real projective plane (see this paper)
- non-connected: triangulation of the disjoint union of a disk and a torus
Question: Is there a non-contractible homogeneous oriented connected simplicial complex with Euler Characteristic $1$?
$(S^1 \times S^3) \#\Bbb CP^2$