Versions of this theory that include fermions led to the development of the concept of supersymmetry.
In some variants of this, six-dimensional Calabi-Yau manifolds are used to depict the extra dimensions of spacetime. Central to this theory are the inclusion of increased degrees of freedom for all physical (*) properties. The earliest model only incorporated bosons, however later models have included gauge fields such as photons. Versions of this theory that include fermions led to the development of the concept of supersymmetry. D-branes are a central component of, FTP, what theoretical physics model that states that the universe is composed of vibrating one dimensional objects as opposed to zero dimensional points?
In some variants of this, six-dimensional Calabi-Yau manifolds are used to depict the extra dimensions of spacetime.
{String} Theory