Björn Andreas

TL;DR: In this paper, the authors discuss to what extent one can draw conclusions about F-theory models by just restricting the attention locally to a particular seven-brane and show that the possible D 7 -branes are not independent from each other and the (compact part of the) D 7brane can have unavoidable intrinsic singularities.

TL;DR: In this article, it was shown that a given Calabi-Yau threefold with a stable holomorphic vector bundle can be perturbed to a solution of the Strominger system provided that the second Chern class of the vector bundle is equal to the second class of tangent bundle.

TL;DR: In this article, the authors derived the net number of generations of chiral fermions in heterotic string compactifications on Calabi-Yau threefolds with certain SU(n) vector bundles, for n odd, using the parabolic approach for bundles.

TL;DR: In this article, it was shown that a stable vector bundle V on a Calabi-Yau threefold X which satisfies c 2 ( X ) = c 2( V ) can be deformed to a solution of the Strominger system and the equations of motion of heterotic string theory.

TL;DR: In this paper, it was shown that a given Calabi-Yau threefold with a stable holomorphic vector bundle can be perturbed to a solution of the Strominger system provided that the second Chern class of the vector bundle is equal to the second class of tangent bundle.