This paper aims to shed light on what becomes of discrete torsion within heterotic orbifolds when they are resolved to smooth geometries. Gauged Linear Sigma Models (GLSMs) possessing (0,2) worldsheet supersymmetry are employed as interpolations between them.

Resolutions of certain toroidal orbifolds, like T6/ℤ2 × ℤ2, are far from unique, due to triangulation dependence of their resolved local singularities. This leads to an explosion of the number of topologically distinct smooth geometries associated to a single orbifold. By introducing a parameterisation …

Resolutions of certain toroidal orbifolds, like T6/Z2xZ2, are far from unique, due to triangulation dependence of their resolved local singularities. This leads to an explosion of the number of topologically distinct smooth geometries associated to a single orbifold. By introducing a parameterisation …

Asymmetric heterotic orbifolds are discussed from the worldsheet perspective. Starting from Buscher’s gauging of a theory of D compact bosons the duality covariant description of Tseytlin is obtained after a non–Lorentz invariant gauge fixing. A left–over of the gauge symmetry can be used to removed …

To obtain a unified framework for symmetric and asymmetric heterotic orbifold constructions we provide a systematic study of Narain compactifications orbifolded by finite order T -duality subgroups. We review the generalized vielbein that parametrizes the Narain moduli space (i.e. the metric, the B-field …

Deze scriptie beschrijft het onderzoek naar het gebruik van rijenbemesting van drijfmest in de maïsteelt middels GPS-besturing en de bereidheid tot het gebruik hiervan door loonwerkers en maïstelers.

To know which cow is needed in the future, there are different things you need to know. The current situation on the market is needed, which cows do the farmers have at this moment and on which parts is the focus of the farmer for breeding the next generation of cows and also what are the trend s in …

In this review we describe the recent progress in understanding of field theory on singular orbifolds and compare some of these results with corresponding string computations. Using orbifold trace formulae expressions for anomalies and tadpoles are obtained. For more complicated computations like the …

Supersymmetric non-linear unification in particle physics: Kähler manifolds, bundles for matter representations and anomaly cancellation.