249 citations · 2k across the 68 of their papers we have counts for
8 papers · 1 filter
Stringy profiles of gauge field tadpoles near orbifold singularities: II. field theoretical implications
Stefan Groot Nibbelink, Mark Laidlaw
Recent work has provided a direct string calculation of the internal coordinate dependence of gauge field tadpoles on the orbifold C^3/Z_3. We investigate the structure of these pr…
Stringy profiles of gauge field tadpoles near orbifold singularities: I. heterotic string calculations
Stefan Groot Nibbelink, Mark Laidlaw
Closed string theories on orbifolds contain both untwisted and twisted states. The latter are normally assumed to live exactly at the orbifold fixed points. We perform a calculatio…
Localization of heterotic anomalies on various hyper surfaces of T^6/Z_4
Stefan Groot Nibbelink, Mark Hillenbach, Tatsuo Kobayashi +1
We investigate the structure of local anomalies of heterotic E_8 x E_8' theory on T^6/Z_4. We show that the untwisted states lead to anomalies in ten, six and four dimensions. At e…
Relativistic fluid mechanics, Kahler manifolds and supersymmetry
T. S. Nyawelo, J. W. van Holten, S. Groot Nibbelink
We propose an alternative for the Clebsch decomposition of currents in fluid mechanics, in terms of complex potentials taking values in a Kahler manifold. We reformulate classical…
Traces on orbifolds: Anomalies and one-loop amplitudes
S. Groot Nibbelink
In the recent literature one can find calculations of various one--loop amplitudes, like anomalies, tadpoles and vacuum energies, on specific types of orbifolds, like S^1/Z_2. This…
Cosmological bounds on large extra dimensions from non-thermal production of Kaluza-Klein modes
Rouzbeh Allahverdi, Chris Bird, Stefan Groot Nibbelink +1
The existing cosmological constraints on theories with large extra dimensions rely on the thermal production of the Kaluza-Klein modes of gravitons and radions in the early Univers…
Localized tadpoles of anomalous heterotic U(1)'s
S. Groot Nibbelink, H. P. Nilles, M. Olechowski +1
We investigate the properties of localized anomalous U(1)'s in heterotic string theory on the orbifold T^6/Z_3. We argue that the local four dimensional and original ten dimensiona…
Singular supersymmetric sigma models
T. S. Nyawelo, F. Riccioni, J. W. van Holten +1
Supersymmetric non-linear sigma-models are described by a field dependent Kaehler metric determining the kinetic terms. In general it is not guaranteed that this metric is always i…